Yapei Wang

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Name: 王亚培

Organization: Renmin University of China , China

Department: Department of Chemistry

Title: Researcher/Professor(PhD)

Chemicals
References

Light-Triggered CO2 Breathing Foam via Nonsurfactant High Internal Phase Emulsion

Co-reporter:Shiming Zhang, Dingguan Wang, Qianhao Pan, Qinyuan Gui, Shenglong Liao, and Yapei Wang

ACS Applied Materials & Interfaces October 4, 2017 Volume 9(Issue 39) pp:34497-34497

Publication Date(Web):September 15, 2017

DOI:10.1021/acsami.7b11315

Solid materials for CO2 capture and storage have attracted enormous attention for gaseous separation, environmental protection, and climate governance. However, their preparation and recovery meet the problems of high energy and financial cost. Herein, a controllable CO2 capture and storage process is accomplished in an emulsion-templated polymer foam, in which CO2 is breathed-in under dark and breathed-out under light illumination. Such a process is likely to become a relay of natural CO2 capture by plants that on the contrary breathe out CO2 at night. Recyclable CO2 capture at room temperature and release under light irradiation guarantee its convenient and cost-effective regeneration in industry. Furthermore, CO2 mixed with CH4 is successfully separated through this reversible breathing in and out system, which offers great promise for CO2 enrichment and practical methane purification.Keywords: gas separation; light-triggered; porous foam; recyclable CO2 capture; surfactant-free high internal phase emulsion;

Multichannel Dynamic Interfacial Printing: An Alternative Multicomponent Droplet Generation Technique for Lab in a Drop

Co-reporter:Shenglong Liao, Xinglei Tao, Yingjiao Ju, Jie Feng, Wenbin Du, and Yapei Wang

ACS Applied Materials & Interfaces December 20, 2017 Volume 9(Issue 50) pp:43545-43545

Publication Date(Web):November 24, 2017

DOI:10.1021/acsami.7b16456

Generation of uniform emulsion droplets mixed with multiple components is one of the key issues in the field of lab in a drop. Traditionally, droplet microfluidic chips are often served as the prime choice while designing and fabricating microfluidic chips always rely on skilled technician and specialized equipment, severely restricting its wide accessibility. In this work, an alternative technique, called multichannel dynamic interfacial printing (MC-DIP), was proposed for multicomponent droplet generation. The MC-DIP device was designed modularly and could be set up manually without any microfabrication process, exhibiting full accessibility for freshmen after a brief training. This new technique owns advantages in the generation of droplets with predictable sizes and composites. Quantitative experiments of measuring minimum inhibitory concentration (MIC) value via mixing microbes and antibiotics into droplet were conducted to proving its application potential for lab in a drop. Further research on a clinical pathogenic strain revealed that this technique could be potentially applied in the clinical laboratory for antibiotic susceptibility testing.Keywords: droplet generation; liquid mixing; MIC testing; multicomponent;

P–N Conversion in a Water–Ionic Liquid Binary System for Nonredox Thermocapacitive Converters

Co-reporter:Hanyu Jia, Zhaoyang Ju, Xinglei Tao, Xiaoqian Yao, and Yapei Wang

Langmuir August 8, 2017 Volume 33(Issue 31) pp:7600-7600

Publication Date(Web):July 12, 2017

DOI:10.1021/acs.langmuir.7b00746

An intriguing p–n conversion of thermoelectric property was observed in a water–ionic liquid ([EMIm][Ac]) binary system with precise control over water content. The highest p-type and n-type Seebeck coefficient were optimized at water–[EMIm][Ac] molar ratio of 2:1 and 4:1, respectively. DFT calculation illustrates that a configuration of solvent separation ion pairs is preferred at the water–[EMIm][Ac] molar ratio of 4:1, leading to the p–n conversion through weakening interaction between anion clusters and gold electrodes. Furthermore, p–n thermocapacitive converters were integrated to enhance the output Seebeck voltages. This work opens up new perspectives for harvesting low grade heat with the use of fluidic materials.

Highly Efficient NIR-II Photothermal Conversion Based on an Organic Conjugated Polymer

Co-reporter:Yuanyuan Cao, Jin-Hu Dou, Ning-jiu Zhao, Shiming Zhang, Yu-Qing Zheng, Jian-Ping Zhang, Jie-Yu Wang, Jian PeiYapei Wang

Chemistry of Materials 2017 Volume 29(Issue 2) pp:

Publication Date(Web):December 5, 2016

DOI:10.1021/acs.chemmater.6b04405

Development of special organic materials that are able to absorb light energy in the second near-infrared window (NIR-II) is significantly important for treating deep-tissue-buried diseases or supplying power to implantable electronic devices. Herein, a narrow bandgap donor–acceptor (D-A) conjugated polymer with thiophene-fused benzodifurandione-based oligo(p-phenylenevinylene) (TBDOPV) as acceptor part and 2,2′-bithiophene (DT) as donor part was developed and exploited as a photothermal conversion material with high extinction coefficient and robust photostability in the NIR-II window. According to transient absorption analysis results, the photothermal conversion ability of this polymer is attributed to the fast internal conversion (IC) process. The high photothermal conversion efficiency makes this polymer a promising NIR-II adsorbing antenna to remotely actuate thermo-dependent devices, e.g., high-performance photothermal–electrical and photothermal–mechanical converters.

NIR light-triggered expansive starch particles for use as artificial thrombi

Co-reporter:Shiming Zhang;Shenglong Liao;Yuanyuan Cao;Jian Wang;Ruiting Li;Zhen Wang

Journal of Materials Chemistry B 2017 vol. 5(Issue 25) pp:4966-4972

Publication Date(Web):2017/06/28

DOI:10.1039/C7TB01094J

Artificially inducing thrombi within the blood vessels around tumor tissue is considered as one of the new strategies for cancer treatment. Herein, a kind of near infrared (NIR) light-triggered expansive particle is designed and developed to act as an artificial thrombus, with the aim of blocking the stimulated blood vessel via remote control. Taking advantage of the thermal expansion of starch particles and the outstanding photothermal conversion ability of polypyrrole nanoparticles (PPy NPs), these starch particles loaded with PPy NPs can expand and thus block microchannels under illumination from NIR light within several minutes. Additionally, a fluorescent cargo encapsulated in the starch particles is released along with the particle expansion, showing the potential integration of embolism therapy and chemotherapy to impede cancer cell metastasis and proliferation more efficiently.

Synergetic regulation of CO2 and light for controllable inversion of Pickering emulsions

Co-reporter:Yuanyuan Cao;Zhen Wang;Shiming Zhang

Materials Chemistry Frontiers 2017 vol. 1(Issue 10) pp:2136-2142

Publication Date(Web):2017/09/27

DOI:10.1039/C7QM00275K

Manipulating inversion of Pickering emulsions via “green” and “erasable” external stimuli is at the forefront of developing emulsion-templated materials on account of no chemical addition and convenience. Herein, a type of synergetic CO2- and light-triggered Pickering emulsion was constructed using a special emulsifier formulated by poly[2-(diethylamino)ethyl methacrylate] (PDEAEMA)-grafted-polydopamine (PDA) nanoparticles. Taking advantage of the remarkable photothermal-conversion ability of PDA and tunable amphiphilicity of PDEAEMA, water-in-oil (W/O) emulsions stabilized by PDA–PDEAEMA particles could be converted into oil-in-water (O/W) types upon CO2 treatment, and then switched between the W/O type and O/W type reversibly by turning light irradiation on and off. Such controllable emulsion inversion through synergetic CO2 and light stimuli could be applied in temperature-dependent heterogeneous catalysis and separation.

Supercritical Fluid-Driven Polymer Phase Separation for Microlens with Tunable Dimension and Curvature

Co-reporter:Youdi Yang, Xiaopeng Huang, Xinyue Zhang, Fuze Jiang, Xiaogang Zhang, and Yapei Wang

ACS Applied Materials & Interfaces 2016 Volume 8(Issue 13) pp:8849

Publication Date(Web):March 21, 2016

DOI:10.1021/acsami.6b01951

Microlenses are highly sought as reliable means for high-resolution optical imaging at low illumination intensities. Plano-convex configuration with tunable dimension and curvature is an essential feature in the microlens fabrication. In this study, we present a facile and green route for preparing well-defined microlenses based on polymer phase separation in the presence of supercritical carbon dioxide (scCO2). The behaviors of linear polymethylmethacrylate protruded from cross-linked silicone network in scCO2 environment are investigated from the perspectives of thermodynamics and kinetics. Microlenses with dimensions from 2 to 15 μm and contact angles from 55° to 112° are successfully obtained through the adjustment of the kinetic conditions and outgassing rate. With the tunable focal length, they exhibit intrinsic function of discerning submicroscale patterns that are unable to be observed directly under optical microscope. Moreover, size confinement on the substrate results in the generation of well-ordered microlens arrays, affording great promise for applications in bioimaging, photolithography, light harvesting, and optical nanosensing.Keywords: microlens; microlens array; polymer phase separation; supercritical carbon dioxide; variable focal length

Polymer Swelling Induced Conductive Wrinkles for an Ultrasensitive Pressure Sensor

Co-reporter:Naiwei Gao, Xinyue Zhang, Shenglong Liao, Hanyu Jia, and Yapei Wang

ACS Macro Letters 2016 Volume 5(Issue 7) pp:823

Publication Date(Web):June 24, 2016

DOI:10.1021/acsmacrolett.6b00338

Deposition of particular layers of solid materials on a swelling polymer leads to the formation of functional wrinkles after the release of polymer strain. Unlike traditional mechanical stretching, polymer swelling could introduce uniform wrinkle structures on complex substrates as a result of isotropic polymer elongation. In this work, conductive silver wrinkles are grown on an elastomer by combining polymer swelling with electroless deposition. By adjusting the cross-linking ratio of polymer substrate or deposition time, the amplitude and wavelength of wrinkles can be tuned to meet demands for ultrasensitive pressure sensors. The detectable pressure limit is successfully reached below 1.0 Pa.

Emulsion Templating Cyclic Polymers as Microscopic Particles with Tunable Porous Morphology

Co-reporter:Dingguan Wang, Lifen Xiao, Xinyue Zhang, Ke Zhang, and Yapei Wang

Langmuir 2016 Volume 32(Issue 6) pp:1460-1467

Publication Date(Web):January 22, 2016

DOI:10.1021/acs.langmuir.5b04159

Cyclic polymers are a particular class of macromolecules without terminal groups. Most studies has involved their physical properties and polymer composition, while attention has rarely been paid to their emulsification in an oil–water system. Herein we synthesized a cyclic polymer with polystyrene side chains via ring-expansion metathesis polymerization and click-chemistry. This cyclic polymer was compared with linear polystyrene in order to investigate the effect of cyclic topology on preparing porous particles by emulsion templating methods. The contribution of cyclic topology to emulsification originates from the formation of hollow microspheres with the use of cyclic polymer while linear polymer only afforded solid microspheres. With addition of hexadecane as soft template, both cyclic polymer and linear polymer emulsions were successfully converted into porous particles. Superior to linear polymer, cyclic polymer enables the stabilization of emulsion droplets and the tuning of porous morphology. It is revealed that cyclic polymer with nanoring shape tends to assemble at the interfacial area, leading to the Pickering effect that decelerates the macrophase separation. Furthermore, the unique porous feature of polymer particles affords a convenient application for the detection of trace explosive.

Flexible and Self-Healing Thermoelectric Converters Based on Thermosensitive Liquids at Low Temperature Gradient

Co-reporter:Hanyu Jia;Xinglei Tao

Advanced Electronic Materials 2016 Volume 2( Issue 7) pp:

Publication Date(Web):

DOI:10.1002/aelm.201600136

Cooperation of Amphiphilicity and Crystallization for Regulating the Self-Assembly of Poly(ethylene glycol)-block-poly(lactic acid) Copolymers

Co-reporter:Zhen Wang, Yuanyuan Cao, Jiaqi Song, Zhigang Xie, and Yapei Wang

Langmuir 2016 Volume 32(Issue 37) pp:9633-9639

Publication Date(Web):August 5, 2016

DOI:10.1021/acs.langmuir.6b02211

Tuning the amphiphilicity of block copolymers has been extensively exploited to manipulate the morphological transition of aggregates. The introduction of crystallizable moieties into the amphiphilic copolymers also offers increasing possibilities for regulating self-assembled structures. In this work, we demonstrate a detailed investigation of the self-assembly behavior of amphiphilic poly(ethylene glycol)-block-poly(l-lactic acid) (PEG-b-PLLA) diblock copolymers with the assistance of a common solvent in aqueous solution. With a given length of the PEG block, the molecular weight of the PLA block has great effect on the morphologies of self-assembled nanoaggregates as a result of varying molecular amphiphilicity and polymer crystallization. Common solvents including N,N-dimethylformamide, dioxane, and tetrahydrofuran involved in the early stage of self-assembly led to the change in chain configuration, which further influences the self-assembly of block copolymers. This study expanded the scope of PLA-based copolymers and proposed a possible mechanism of the sphere-to-lozenge and platelet-to-cylinder morphological transitions.

A Light-Activated Microheater for the Remote Control of Enzymatic Catalysis

Co-reporter:Yuanyuan Cao;Zhen Wang;Shenglong Liao;Jian Wang ;Dr. Yapei Wang

Chemistry - A European Journal 2016 Volume 22( Issue 3) pp:1152-1158

Publication Date(Web):

DOI:10.1002/chem.201503665

Abstract

The remote control of enzymatic catalysis is of significant importance in disease treatment and industrial applications. Herein, we designed a microheater composed of a porous polylactic acid (PLA) matrix and polydopamine (PDA) with notable photothermal conversion capability. Starch hydrolysis, catalyzed by using α-amylase, was accelerated in the presence of the microheater under illumination with near-infrared light or natural sunlight at room temperature. Additionally, the methodology was extended to the preparation of microwave-absorbing materials with the deposition of polyaniline on porous PLA matrix. The porous morphology improves the energy-conversion efficiency.

Surfactant-Free Emulsions with Erasable Triggered Phase Inversions

Co-reporter:Yiwen Chen, Zhen Wang, Dingguan Wang, Ning Ma, Cancan Li, and Yapei Wang

Langmuir 2016 Volume 32(Issue 42) pp:11039-11042

Publication Date(Web):September 28, 2016

DOI:10.1021/acs.langmuir.6b03189

Complex emulsions including double emulsions and high-internal-phase emulsions (HIPEs) are wonderful templates for producing porous polymeric materials. Yet, surfactants and multiple emulsifications are generally needed. In this work, surfactant-free complex emulsions are successfully prepared using a CO2-responsive block copolymer through one-step emulsification. Phase inversion from HIPEs to double emulsions happens in one system upon the change in polymer amphiphilicity as a result of CO2 triggering. The one-step emulsification method offers great convenience for converting the block copolymer into porous 3D scaffolds and particles. Moreover, CO2 triggering is erasable so that the polymer can be repeatedly used for controllable complex emulsions as well as porous materials.

Rapid Self-Assembly of Block Copolymers for Flower-Like Particles with High Throughput

Co-reporter:Zhen Wang, Yuanyuan Cao, Xinyue Zhang, Dingguan Wang, Ming Liu, Zhigang XieYapei Wang

Langmuir 2016 Volume 32(Issue 50) pp:13517-13524

Publication Date(Web):November 24, 2016

DOI:10.1021/acs.langmuir.6b03940

The self-assembly of block copolymers has evolved into a foremost bottom-up approach for building polymeric materials. Historical challenges exist within this lively field, including the scalability and elegant simplicity of self-assembled aggregates with predictable structures. Here, we report a generally applicable strategy for the rapid self-assembly of poly(ethylene glycol)-block-poly(l-lactic acid) with the help of a single oil-in-water emulsion. A kind of flower-like polymer particle with filamentous surface branches is rapidly formed after removing the oil phase from the emulsion system. Moreover, the dimension of the branched filaments and the spherical internal core can be controlled through regulating the block ratio and the emulsification conditions. In particular, we propose an explosion theory as a balance between phase separation and interchain interaction for explaining the formation of the branched structures of the flower-like particles. The particles with high throughput are further functionalized with polypyrrole for their use in enhanced photoelectric-sensing applications.

A Self-Healing Electronic Sensor Based on Thermal-Sensitive Fluids

Co-reporter:Yonglin He;Shenglong Liao;Hanyu Jia;Yuanyuan Cao;Zhenning Wang

Advanced Materials 2015 Volume 27( Issue 31) pp:4622-4627

Publication Date(Web):

DOI:10.1002/adma.201501436

Enhanced Light Absorption in Porous Particles for Ultra-NIR-Sensitive Biomaterials

Co-reporter:Jian Wang, Jing Zhao, Yanbo Li, Man Yang, Yu-Qiang Chang, Jian-Ping Zhang, Zhiwei Sun, and Yapei Wang

ACS Macro Letters 2015 Volume 4(Issue 4) pp:392

Publication Date(Web):March 23, 2015

DOI:10.1021/acsmacrolett.5b00089

Conducting polymers with the capability of photothermal conversion extend the application of near-infrared light (NIR), satisfying the demands of less toxicity, easy availability, and high flexibility for NIR-sensitive materials. The improvement of light use efficiency is still urgent and challenging. In this work, an ultra-NIR-sensitive biocompatible porous particle composed of a polylactic acid matrix and polypyrrole nanoparticles is prepared via a one-step double-emulsion method. It is revealed that the light absorption of polyprryole is effectively improved within the porous structure. This particle is exploited as a cost-effective sensing material in terms of its conductivity change for preparing paper-based NIR light sensors. Moreover, the microspheres act as a guardian to encapsulate and lock excess nucleic acids which is useful for preventing inflammatory diseases.

The Continuous Exudation of Micro-Meniscus Capsules by Polymer Perspiration

Co-reporter:Xinyue Zhang;Yonglin He

Advanced Materials Interfaces 2015 Volume 2( Issue 3) pp:

Publication Date(Web):

DOI:10.1002/admi.201400474

Perspiration is a common phenomenon in many natural creatures in order to maintain their steady state. Here, through the facile use of a linear polymer of polymethylmethacrylate (PMMA) and an incompatible polymer of cross-linked polydimethylsiloxane (PDMS) under an organic-solvent atmosphere, the polymer system undergoes an analogous perspiration phenomenon as a result of the macroscopic phase separation between the two polymers. The resulting “sweat,” consisting of PMMA and solvent, are solidified into extraordinary micro-meniscus capsules on the PDMS surface, which does not rely on the shape and topography of the PDMS substrates. Perspiration continues until the sweat of PMMA is exhausted, enabling the production of recoverable microstructures without complicated manufacturing processes. A thorough assessment of the influencing factors for the perspiration reveals that the formation of micro-meniscus capsules follows a process of protrusion, ripening, and solidification. The micro-meniscus capsules are primarily evaluated for applications in light scattering, in organic-vapor sensing, and in bio-macromolecular immobilization.

Integrating Ultra-Thermal-Sensitive Fluids into Elastomers for Multifunctional Flexible Sensors

Co-reporter:Hanyu Jia;Yonglin He;Xinyue Zhang;Wenbin Du

Advanced Electronic Materials 2015 Volume 1( Issue 3) pp:

Publication Date(Web):

DOI:10.1002/aelm.201500029

Pen-Writing Polypyrrole Arrays on Paper for Versatile Cheap Sensors

Co-reporter:Hanyu Jia, Jian Wang, Xinyue Zhang, and Yapei Wang

ACS Macro Letters 2014 Volume 3(Issue 1) pp:86

Publication Date(Web):December 31, 2013

DOI:10.1021/mz400523x

A simple and low-cost “pen-writing” method is exploited for integrating conducting polymer on cellulosic paper. The pen-written paper chip not only possesses excellent mechanical and electrical properties, but also serves as a versatile sensor, fulfilling several real-time and in situ detections for ammonia gas, thermal heating, and NIR light. The theoretical detection limit of ammonia gas can be as low as 1.2 ppm, which is a promising performance for industrial application. In addition, this “pen-writing” technique can be extended to generate wearable electrical textiles in a large scale.

A Photo-annealing Approach for Building Functional Polymer Layers on Paper

Co-reporter:Qiuping Qian;Jian Wang; Feng Yan; Yapei Wang

Angewandte Chemie 2014 Volume 126( Issue 17) pp:4554-4557

Publication Date(Web):

DOI:10.1002/ange.201310714

Abstract

A straightforward photo-annealing approach was developed for building functional polymer layers on paper. Conducting polyaniline with the ability for photothermal conversion can be readily annealed by near-infrared light. The annealed polymers become both insulating and hydrophobic. Selective photo-annealing produces a functional layer with patterned conductive arrays. This material exhibits real-time response to ammonium gas. Complete photo-annealing preserves the porous structure but changes the wettability of the polyaniline-nanofiber film.

Rcktitelbild: A Photo-annealing Approach for Building Functional Polymer Layers on Paper (Angew. Chem. 17/2014)

Co-reporter:Qiuping Qian;Jian Wang; Feng Yan; Yapei Wang

Angewandte Chemie 2014 Volume 126( Issue 17) pp:

Publication Date(Web):

DOI:10.1002/ange.201401118

Back Cover: A Photo-annealing Approach for Building Functional Polymer Layers on Paper (Angew. Chem. Int. Ed. 17/2014)

Co-reporter:Qiuping Qian;Jian Wang; Feng Yan; Yapei Wang

Angewandte Chemie International Edition 2014 Volume 53( Issue 17) pp:

Publication Date(Web):

DOI:10.1002/anie.201401118

A Photo-annealing Approach for Building Functional Polymer Layers on Paper

Co-reporter:Qiuping Qian;Jian Wang; Feng Yan; Yapei Wang

Angewandte Chemie International Edition 2014 Volume 53( Issue 17) pp:4465-4468

Publication Date(Web):

DOI:10.1002/anie.201310714

Abstract

Managing the Phase Separation in Double Emulsion by Tuning Amphiphilicity via a Supramolecular Route

Co-reporter:Dingguan Wang, Xiaopeng Huang, and Yapei Wang

Langmuir 2014 Volume 30(Issue 48) pp:14460-14468

Publication Date(Web):2017-2-22

DOI:10.1021/la5043525

Double emulsion has attracted intense scientific investigation on account of its use in a wide range of applications. However, the process of its solidification is usually accompanied by the problem of uncontrollable phase separation. In this work, a supramolecular route is proposed to manage the phase separation in double emulsion. Different degrees of phase separations, from complete wetting to partial wetting and complete dewetting, have been achieved in an emulsion system consisting of P4VP–oleic acid. Partial wetting offers a strategy for generating polymer particles with controllable anisotropic structures. It is demonstrated that the amphiphilicity of polymer matrix, relying on the change of polymer–acid ratio or the chain length of aliphatic acid, is of vital importance for determining the degree of phase separation. A spreading and wetting theory is established to predict and explain the formation of partial wetting.

Integration of antireflection and light diffraction in nature: a strategy for light trapping

Co-reporter:Xinyue Zhang, Deyang Ji, Ting Lei, Bin Zhao, Kai Song, Wenping Hu, Jie-Yu Wang, Jian Pei and Yapei Wang

Journal of Materials Chemistry A 2013 vol. 1(Issue 36) pp:10607-10611

Publication Date(Web):19 Jul 2013

DOI:10.1039/C3TA11738C

The replication of an entire cicada wing was conducted by using a low-surface-energy florin polymer. The replicated polymeric coatings are capable of high-performance antireflection and light diffraction which can enhance light transmission and change the light pathway. The unique improvement in light trapping shows that these biological replicas are suitable for promoting the efficient utilization of light in a wide range of optic devices.

One-step Preparation of Macroporous Polymer Particles with Multiple Interconnected Chambers: A Candidate for Trapping Biomacromolecules

Co-reporter:Qiuping Qian;Xiaopeng Huang;Xinyue Zhang; Zhigang Xie; Yapei Wang

Angewandte Chemie 2013 Volume 125( Issue 40) pp:10819-10823

Publication Date(Web):

DOI:10.1002/ange.201305003

One-step Preparation of Macroporous Polymer Particles with Multiple Interconnected Chambers: A Candidate for Trapping Biomacromolecules

Co-reporter:Qiuping Qian;Xiaopeng Huang;Xinyue Zhang; Zhigang Xie; Yapei Wang

Angewandte Chemie International Edition 2013 Volume 52( Issue 40) pp:10625-10629

Publication Date(Web):

DOI:10.1002/anie.201305003

Directing Silicon–Graphene Self-Assembly as a Core/Shell Anode for High-Performance Lithium-Ion Batteries

Co-reporter:Yuanhua Zhu, Wen Liu, Xinyue Zhang, Jinchao He, Jitao Chen, Yapei Wang, and Tingbing Cao

Langmuir 2013 Volume 29(Issue 2) pp:744-749

Publication Date(Web):December 26, 2012

DOI:10.1021/la304371d

There is great interest in utilization of silicon-containing nanostructures as anode materials for lithium-ion batteries but usually limited by manufacturing cost, their intrinsic low electric conductivity, and large volume changes during cycling. Here we present a facile process to fabricate graphene-wrapped silicon nanowires (GNS@Si NWs) directed by electrostatic self-assembly. The highly conductive and mechanical flexible graphene could partially accommodate the large volume change associated with the conversion reaction and also contributed to the enhanced electronic conductivity. The as-prepared GNS@Si NWs delivered a reversible capacity of 1648 mAh·g–1 with an initial Coulombic efficiency as high as 80%. Moreover, capacity remained 1335 mAh·g–1 after 80 cycles at a current of 200 mA·g–1, showing significantly improved electrochemical performance in terms of rate capability and cycling performance.

Integration of antireflection and light diffraction in nature: a strategy for light trapping

Co-reporter:Xinyue Zhang, Deyang Ji, Ting Lei, Bin Zhao, Kai Song, Wenping Hu, Jie-Yu Wang, Jian Pei and Yapei Wang

Journal of Materials Chemistry A 2013 - vol. 1(Issue 36) pp:NaN10611-10611

Publication Date(Web):2013/07/19

DOI:10.1039/C3TA11738C

NIR light-triggered expansive starch particles for use as artificial thrombi

Co-reporter:Shiming Zhang, Shenglong Liao, Yuanyuan Cao, Jian Wang, Ruiting Li, Zhen Wang and Yapei Wang

Journal of Materials Chemistry A 2017 - vol. 5(Issue 25) pp:NaN4972-4972

Publication Date(Web):2017/05/22

DOI:10.1039/C7TB01094J