Co-reporter:Pei Xie;Youya Wang;Zhiyong Gao;Hange Feng;Lingwei Li;Dajun Wu;Lianwei Wang;Paul K. Chu
RSC Advances (2011-Present) 2017 vol. 7(Issue 18) pp:10631-10637
Publication Date(Web):2017/02/07
DOI:10.1039/C6RA27541A
ZnSe nanowalls are prepared on Zn substrates hydrothermally at 180 °C for 12 h. The structure, morphology, and chemical composition of the ZnSe nanowalls are determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray analysis (EDS), and Raman scattering. The concentration of hydrazine hydrate (N2H4·H2O) plays an important role in the formation and morphology of the ZnSe nanowalls and XRD reveals that all the ZnSe nanocrystals have a cubic zinc blende structure. The ZnSe nanowalls with an optimal morphology deliver a good field electron emission performance with a turn-on field of 1.51 V μm−1 and enhancement factor of 4797. The formation mechanism is discussed. The simple and controlled preparation procedures and good properties of the ZnSe nanowalls bode well for application in electronics and optoelectronics.
Co-reporter:Xiaona Ye;Xiaoyun Xu;Lingwei Li
Journal of Materials Science: Materials in Electronics 2017 Volume 28( Issue 2) pp:1159-1167
Publication Date(Web):2017 January
DOI:10.1007/s10854-016-5641-8
SnO2 micromaterials were synthesized via hydrothermal method at a temperature of 200 °C for 24 h without employment of catalysts or surfactants. With the dosage of the precursor (SnCl4) increasing, variable microstructures of SnO2, ophiopogon japonicas-like micrograsses, microcones, microflowers and microcorals, were obtained. The as-prepared SnO2 samples were characterized by X-ray diffraction (XRD), scanning electron microscope and energy dispersive spectrometer respectively. XRD results indicated the as-grown SnO2 samples have a tetragonal rutile structure. Among those different morphologies, micrograsses SnO2 exhibited the best field emission performance with a low turn-on field of 1.05 V/µm and a high field enhancement factor of 3880. The results are quite comparable to reported data and strongly imply the micrograsses SnO2 is a potential material for fabricating efficient emitters of display devices and vacuum electronics.
Co-reporter:Jia Wei, Shaolin Xue, Pei Xie, Rujia Zou
Applied Surface Science 2016 Volume 376() pp:172-179
Publication Date(Web):15 July 2016
DOI:10.1016/j.apsusc.2016.03.058
Highlights
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Different SnO2 microspheres were grown on GOs by hydrothermal method.
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The morphology was influenced by volume ratio of ethanol and concentrations of precursor.
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The shape of SnO2 microspheres looks like dandelion.
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The photocatalytic property is strongly influenced by the SnO2 morphology on GOs.
Co-reporter:S.L. Xue, S.X. Wu, Q.Z. Zeng, P. Xie, K.X. Gan, J. Wei, S.Y. Bu, X.N. Ye, L. Xie, R.J. Zou, C.M. Zhang, P.F. Zhu
Applied Surface Science 2016 Volume 365() pp:69-75
Publication Date(Web):1 March 2016
DOI:10.1016/j.apsusc.2016.01.022
Highlights
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Novel ZnSe nanoflowers are grown on Zn foils.
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ZnSe nanoflowers are characterized by XRD, SEM, TEM, XPS and Raman spectra.
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ZnSe nanoflowers on Zn foils as cathodes possess good FE properties.
Co-reporter:S.Y. Bu, L.W. Li, P. Xie, H. Liu, S.L. Xue
Ceramics International 2016 Volume 42(Issue 4) pp:5075-5081
Publication Date(Web):March 2016
DOI:10.1016/j.ceramint.2015.12.021
Zinc selenide (ZnSe) micro-grasses and microspheres have been successfully grown on graphene oxide sheets by the hydrothermal method. The morphologies, structures, chemical compositions and optical properties of the as-synthesized graphene oxide (GO)/ZnSe microstructures have been characterized by X-ray power diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), ultraviolet-visible (UV–vis) absorption spectroscopy and photoluminescence (PL) spectroscopy. By adjusting the concentration of NaOH and EDTA, needle-like, coral grass-like, orchid-like, and spherical ZnSe microstructures have been synthesized.
Co-reporter:Pei Xie, Shaolin Xue, Youya Wang, Zhiyong Gao, Hange Feng, Lingwei Li, Rujia Zou
Ceramics International 2016 Volume 42(Issue 16) pp:18264-18270
Publication Date(Web):December 2016
DOI:10.1016/j.ceramint.2016.08.151
Abstract
Different morphologies of CdSe microspheres have been synthesized on reduced graphene oxide (rGO) sheets by a simple hydrothermal process using Cadmium nitrate and Se powder as the raw materials. The hybrid CdSe/rGO samples were intensively investigated by XRD, EDS, XPS, SEM and UV–vis absorption spectrum. It was found that the EDTA/Cd2+ molar ratio is crucial for the formation of morphology of CdSe grown on rGO sheets. The results of XRD reveal that the as-prepared CdSe microspheres have zinc blend structure. The results of Raman spectra, EDS, XPS and SEM show that the CdSe microspheres are grown on rGO sheets. In addition, UV–vis absorption spectrum indicates that the CdSe/rGO nanocomposites are believed to serve as photosensitizers to extend the absorption spectrum to visible light region. Superior photocatalytic activity of urchin-like CdSe microspheres grown on rGO sheets relative to those of other CdSe/rGO nanocomposites was observed under visible light irradiation. The growth mechanism for the formation of CdSe microspheres grown on rGO sheets was also described.
Co-reporter:Jia Wei, Shaolin Xue, Pei Xie, Rujia Zou
Materials Letters 2015 Volume 158() pp:322-324
Publication Date(Web):1 November 2015
DOI:10.1016/j.matlet.2015.06.028
•Different SnO2 nanograsses were grown on GOs by hydrothermal method.•The morphology was strongly influenced by volume ratio of ethanol in the solvent.•FE properties of the nanograsses were studied.•FE performance is strongly influenced by the SnO2 morphology on GOs.Different SnO2 nanograsses have been successfully synthesized on graphene oxide sheets (GOs) by a hydrothermal method. The morphologies and compositions of as-synthesized SnO2 nanograsses on GOs (SNGs) were characterized by X-ray powder diffraction (XRD), X-ray energy dispersive spectrometer (EDS) and field-emission scanning electron microscopy (FE-SEM). By adjusting the volume ratios of ethanol in the ethanol–water solvent (r), the morphologies of SNGs were highly manipulated. The field emission (FE) properties of SNGs were measured and found to be strongly influenced by the morphologies of SnO2. The needle-like SNGs have efficient FE properties with a low turn-on electric field of 5.23 V μm−1 and a high field enhancement factor of 2388 among all the samples.
Co-reporter:Q.Z. Zeng, S.L. Xue, S.X. Wu, K.X. Gan, L. Xu, J.W. Han, W.K. Zhou, Y.T. Shi, R.J. Zou
Materials Science in Semiconductor Processing 2015 Volume 31() pp:189-194
Publication Date(Web):March 2015
DOI:10.1016/j.mssp.2014.11.033
ZnSe nanostructures, such as nanobelts, nanorods and nanocones, were successfully synthesized on Zn foils via a hydrothermal method using EDTA as soft template at low temperature. EDTA played a significant role on the morphology of ZnSe nanomaterials. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) were carried out to characterize the microstructures and chemical compositions of the as-synthesized ZnSe samples. XRD patterns indicated that the as-synthesized ZnSe samples belonged to a cubic zinc blende structure. SEM observation obviously showed that the nanocones had very sharp tips compared to nanorods and nanobelts. The field emission (FE) measurement showed that the as-synthesized ZnSe nanocones had a lower turn-on field of ~1.6 V μm−1 at the current density of 10 μA cm−2. A high field enhancement factor of ~4514 was achieved for the ZnSe nanocones. The superior field emission properties were probably attributed to the sharp tips of the ZnSe nanocones. Room temperature photoluminescence (PL) spectroscopy of the ZnSe nanostructures showed a wide band emission from blue light to orange light. The as-prepared ZnSe nanomaterials have promising applications in optoelectronic devices. A possible formation mechanism of ZnSe nanobelts, nanorods and nanocones was also proposed and discussed.
Co-reporter:Qingzi Zeng, Shaolin Xue, Shuxian Wu, Kaixian Gan, Ling Xu, Junwei Han, Weikang Zhou, Rujia Zou
Ceramics International 2014 Volume 40(Issue 2) pp:2847-2852
Publication Date(Web):March 2014
DOI:10.1016/j.ceramint.2013.10.029
ZnSe rose-like nanoflowers and microspheres were successfully grown on Zn foils by the hydrothermal method at 220 °C for 36 h. Scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), ultraviolet–visible (UV–vis) absorption spectroscopy and photoluminescence (PL) spectroscopy were used to observe the morphologies, structures, chemical compositions and optical properties of the as-synthesized ZnSe samples. The XRD patterns revealed that as-synthesized ZnSe nanoflowers and microspheres have cubic zinc blende structure. The SEM observations showed that low concentration of EDTA was beneficial to obtain the ZnSe rose-like nanoflowers. With increase of EDTA concentration, the morphology of the as-synthesized samples transformed into microspheres. It was proved that EDTA played a significant role during the synthesis of ZnSe rose-like nanoflowers and microspheres. Room temperature photoluminescence (PL) spectroscopy of the samples showed that the spectra were wide band from blue light to orange light. Furthermore, a possible formation mechanism of ZnSe nanoflowers and microspheres was proposed and discussed.
Co-reporter:Weikang Zhou, Shaolin Xue, Junwei Han, Pei Xie
Materials Letters 2014 Volume 134() pp:256-258
Publication Date(Web):1 November 2014
DOI:10.1016/j.matlet.2014.07.101
•Three different morphologies of grass-like ZnSe were grown on graphene oxide sheets.•The addition of diethanolamine has a great influence on the morphology of the ZnSe.•The ZnSe composed of nanorods on graphene oxide sheets have best FE properties.Setaria palmifolia-like, turfgrass-like and needle-like zinc selenide (ZnSe) nanograsses have been successfully grown on graphene oxide sheets (GOss) by a hydrothermal method. The morphologies and compositions of as-synthesized graphene oxide (GO)/ZnSe nanograsses have been characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FE-SEM). The morphologies of ZnSe nanograsses on GOss were highly manipulated by adjusting the addition amount of diethanolamine. The field emission (FE) properties of graphene oxide (GO)/ZnSe nanograsses were measured and found to be strongly influenced by the morphologies of ZnSe. The results show that GO/ZnSe nanograsses composed of nanorods have best FE properties with a low turn-on electric field of 4.5 V μm−1 and a high field enhancement factor of 2715 among all the samples.
Co-reporter:Zhixing Jiang, Shaolin Xue, Shuxian Wu, Rujia Zou, Zhengyu Zhang, Meng Jang
Materials Letters 2013 Volume 105() pp:239-241
Publication Date(Web):15 August 2013
DOI:10.1016/j.matlet.2013.04.028
•C6H12N4 and C6H15NO3 as catalyst precursors.•Catalysts for SnO2/ZnO core-shell nanorods and nanoflowers synthesizing.•Catalysts and concentration playing a very important role in the reaction.•The core-shell structure can provide good field emission properties.The SnO2/ZnO core–shell nanorods and nanoflowers were synthesized by the hydrothermal method. And we obtained several samples by controlling the mixing ratio of the raw material and catalyst. The surface morphology and composition of the as-synthesized SnO2/ZnO core–shell nanoparticles were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The mechanism of formation of SnO2/ZnO core–shell nanoparticles was discussed. Field emission properties of the samples were investigated. The results showed that the core–shell structure can provide good field emission properties such as a low turn-on field of 3.2 V/µm and good electric conductivity.
Co-reporter:Rujia Zou, Gannan Zou, Chunrui Wang, Shaolin Xue
Applied Surface Science 2009 Volume 255(Issue 20) pp:8672-8675
Publication Date(Web):30 July 2009
DOI:10.1016/j.apsusc.2009.06.047
Abstract
In this paper, we studied the effect of NaCl electrolyte as a surface treatment on improving the uniformity and stability of field emission of screen-printed carbon nanotubes (CNTs). A short period of the electrolyte treatment of CNT films remarkably increase emission uniformity and stability. Furthermore, the field emission characteristics of screen-printed carbon nanotubes (CNTs) such as low turn-on field, high emission current density and strong adhesion of the CNT film on the substrate were also reinforced after post-treated. SEM, TEM and Raman spectrum study revealed that uniformity and stability of field emission is enhanced by two factors. Firstly, the electrolyte treatment appeared to render the CNT surfaces more actively by exposing more CNTs form the CNT paste, which dominates initial uniformity and stability of field emission. Secondly, the number of opened CNTs and defects CNTs of CNT film were increased by electrical current energy.
Co-reporter:Rujia Zou, Guannan Zou, Chunrui Wang, Shaolin Xue, Jian Liu, Guangping Ren
Microelectronics Journal 2009 Volume 40(Issue 1) pp:115-119
Publication Date(Web):January 2009
DOI:10.1016/j.mejo.2008.06.076
Screen printing is undoubtedly the most cost-effective process for the fabrication of large-sized carbon nanotube field emission display (CNT-FED). A novel post-treatment method in NaCl electrolyte was presented to solve the problem of poor field emission characteristics of printed CNT films. Compared to those of untreated films, the turn-on electric field of the treated film decreased from 2.4 to 1.4 V/μm and the total emission current of the treated film that has the same printing area as the untreated one increased from ∼100 to ∼1800 μA. Scanning electron microscope (SEM) and Raman spectrum study revealed that field emission characteristics are enhanced by two factors. Firstly, the NaCl electrolyte treatment appeared to render the CNT surfaces more activey by exposing more CNTs from the CNT film. Secondly, the numerous defects of CNTs of the CNT film were increased by electrical current energy.
Co-reporter:Youya Wang, Shaolin Xue, Pei Xie, Zhiyong Gao, Rujia Zou
Materials Letters (1 April 2017) Volume 192() pp:
Publication Date(Web):1 April 2017
DOI:10.1016/j.matlet.2016.12.057
•In2O3 nanospheres were synthesized by hydrothermal method and post-thermal treatment.•Juglans-like In2O3 nanospheres were successfully synthesized.•The morphologies and structures were characterized by EDS, SEM and X-ray diffraction.•The photocatalytic activities were appraised by photocatalytic degradation of Rh B.•The juglans-like In2O3 nanospheres have a much better photocatalytic activity.Juglans-like In2O3 nanospheres were successfully synthesized by hydrothermal method and the post-thermal treatment. X-ray diffraction (XRD) revealed that the as-synthesized In2O3 nanospheres had body-centered cubic structure. The scanning electron microscope (SEM) showed In2O3 nanospheres under different experimental conditions. It was observed that both ethylene glycol and ethylenediamine played roles in the synthesis of juglans-like In2O3 nanospheres. The photocatalytic activity of the In2O3 nanospheres was appraised by photocatalytic degradation of Rhodamine B (Rh B) aqueous solution under visible light. The photocatalytic results showed that compared with other samples (sample 1, 2 and 3) in the paper, the juglans-like In2O3 nanospheres (sample 4) exhibited a better photocatalytic activity.
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