Polymer-Controlled Growth of CdS Nanowires

Zhan, J. H.; Yang, Xiaogang; Wang, D. W.; Li, S. D.; Xie, Yi; Xia, Younan; Qian, Yitai

doi:10.1002/1521-4095(200009)12:18<1348::aid-adma1348>3.0.co;2-x

Cited by 272 publications

(129 citation statements)

References 8 publications

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“…[1,2]. To understand the basic phenomena of quantum size effect on electrical, optical, mechanical and magnetic properties, some important semiconductor nanomaterials, such as GaN [3], CdS [4], Si [5], SnO 2 [6], TiO 2 [7], ZnO [8,9] and CeO 2 [10][11][12][13] have been widely studied. Among them ZnO nanomaterials have been chosen because of their remarkable * E-mail: singh nk24@yahoo.com properties, like wide and direct bandgap (E g ∼ 3.4 eV) and large exciton binding energy (60 meV).…”

Section: Introductionmentioning

confidence: 99%

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Singh¹,

Vishwakarma²

2015

Materials Science-Poland

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In this work, zinc oxide (ZnO) nanorods were obtained by a simple chemical precipitation method in the presence of capping agent: polyvinyl pyrrolidone (PVP) at room temperature. X-ray diffraction (XRD) result indicates that the synthesized undoped ZnO nanorods have hexagonal wurtzite structure without any impurities. It has been observed that the growth direction of the prepared ZnO nanorods is [1 0 1]. XRD analysis revealed that the nanorods have the crystallite size of 49 nm. Crystallite size is calculated by Debye-Scherrer formula and lattice strain is calculated by Williomson-Hall equation. Cell volume, Lorentz factor, Lorentz polarization factor, bond length, texture coefficient, lattice constants and dislocation density have also been studied. We also compared the interplanar spacings and relative peak intensities with their standard values at different angles. The scanning electron microscope (SEM) images confirmed the size and shape of these nanorods. It has been found that the diameter of the nanorods ranges from 1.52 µm to 1.61 µm and the length is about 4.89 µm. It has also been observed that at room temperature ultraviolet visible (UV-Vis) absorption band is around 355 nm (blue shifted as compared to the bulk). The average particle size has also been calculated by mathematical model of effective mass approximation equation, using UV-Vis absorption peak. Finally, the bandgap has been calculated using UV-absorption peak. Electroluminescence (EL) studies show that emission of light is possible at very small threshold voltage and it increases rapidly with increasing applied voltage. It is seen that smaller ZnO nanoparticles give higher electroluminescence brightness starting at lower threshold voltage. The brightness is also affected by increasing the frequency of AC signal.

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Section: Introductionmentioning

confidence: 99%

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Singh¹,

Vishwakarma²

2015

Materials Science-Poland

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“…The (002) peak of the CdS nanowires is weak, while the (100) and (110) peaks are strong compared with the standard card. The reason is that the CdS nanowires trend to grow along [001] direction preferentially, resulting in the fewer exposed (002) crystal planes during the measurement process [33]. The additional diffraction peaks at 2θ of 25.3, 37.8, 48.0, 55.1, and 62.7…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Photocatalytic Activity of One-Dimensional CdS@TiO2 Core-Shell Heterostructures

Zhao

Wei

Wang³

et al. 2011

Nano-Micro Lett

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Abstract:One-dimensional CdS@TiO2 core-shell heterostructures were fabricated via the hydrolysis of tetrabutyl titanate (TBT) on preformed CdS nanowires. The as-prepared products were characterized by X-ray diffraction, transmission electron microscopy, selected area electron diffraction and diffuse reflectance spectroscopy techniques. Results demonstrated that the hydrolysis of TBT had a great influence on the morphology of the coated TiO2 shell, resulting in the formation of TiO2 nanoparticles and nanolayer-modified CdS@TiO2 heterostructures. Degradation of methylene blue using CdS@TiO2 core-shell heterostructures as photocatalysts under visible light irradiation was investigated. Comparative photocatalytic tests showed that the TiO2 nanoparticles-modified heterostructure exhibited a superior activity due to the passivity of photogenerated charge carriers.

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“…The host polymer assists the assemble of CdS nanoparticles to form a new material with a deviation of spherical shape. Zhan et al [18] successfully fabricated long CdS * Corresponding author: duttakousik2003@yahoo.co.in nanowires utilizing polyacrylamide. Wire like assemblies of CdS nanoparticles are fabricated within coreshell cylindrical polymer brushes [19].…”

Section: Introductionmentioning

confidence: 99%

CdS Nanoparticles: Glucose/Starch Synthesis Method and Non Linear Electrical Properties Disperse in Polypyrrole Matrix

Dutta¹

2018

e-J. Surf. Sci. Nanotech.

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Development of environmentally benign methods for the synthesis of nanoparticles is an evolving important branch of nanotechnology. Inorganic-organic hybrid nanocomposites are synthesized by dispersing nanosized CdS in the conducting polypyrrole (PPY) matrix. The samples are characterized by X-ray diffraction, transmission and scanning electron microscopes and UV-VIS spectrophotometer. The wavelength of optical absorption peak of CdS nanoparticle increases from 430 nm to 470 nm with the decrease of polypyrrole concentration. Studies on dc electrical conductivity as a function of temperature suggest that three dimensional Mott's hopping process occurs in CdS-Polypyrrole nanocomposites. The incorporation of CdS nanoparticles enhances the barrier height. The barrier height increases with the content of CdS. The observed nonlinear current-voltage characteristics are satisfactorily explained using the Schottky type barriers.

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Polymer-Controlled Growth of CdS Nanowires

Cited by 272 publications

References 8 publications

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Synthesis and Photocatalytic Activity of One-Dimensional CdS@TiO2 Core-Shell Heterostructures

CdS Nanoparticles: Glucose/Starch Synthesis Method and Non Linear Electrical Properties Disperse in Polypyrrole Matrix

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