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Synthesis and Properties of One-dimensional CdS Nanowire Arrays

Author: ZhangZhiKun
Tutor: LiMengZuo
School: Liaoning Normal University
Course: Condensed Matter Physics
Keywords: CdS Nanomaterials Hydrothermal synthesis method Piezoelectric properties Nano- generator
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 54
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Abstract


Nanomaterials grain size to the nanoscale (10-9m) superfine material. Nanomaterials with novel physical and chemical properties, and is currently a hot research topic in the materials science community, and has broad application prospects. However, a large number of controllable size through experiments, the lower cost of nanomaterials is still a challenging task, but also widely used nanomaterials premise. , Preparation and characterization of the study has important implications for the growth of nanomaterials. Cadmium sulfide (CdS) nano-semiconductor material is a II-VI B A compound, its band degree of 2.42 eV, and has not only the piezoelectric characteristics, but also has good light-emitting and the photoelectric conversion performance, much material the attention of the scientific community in recent years. This thesis uses simple hydrothermal synthesis method, using thiosemicarbazide as a sulfur source, cadmium metal sheet as cadmium source, in a closed reaction vessel equipped with ethylenediamine solution successfully prepared a one-dimensional CdS (CDS) nanowire arrays. The method is reproducible, low growth temperature, can be prepared directly in the Cd-chip one-dimensional orientation of the large area CdS Nanowire Arrays. Meanwhile, the reaction time, the concentration of the lye is the impact on the morphology. The study found that the solution concentration and the reaction time, the different aspect ratio and the growth density of the sample can be obtained by adjusting the reaction. Of the prepared samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) testing technology. The results indicate that the prepared as cadmium sulfide (CdS) in this condition, a very pure sample has a hexagonal lattice structure of the α-type, cadmium sulfide (CdS) nanowire diameter of about 200nm, and a length of about several tens of microns. Under ambient conditions, the use of a helium-cadmium (He-Cd) laser (325nm) photoluminescence (PL) test results show that the samples have a luminous intensity strong intrinsic emission peak in 512nm around. The same time, through experiments, we also found that the concentration of the templating agent ethylenediamine photoluminescence properties of CdS samples have a certain impact. The paper will also synthesized in the preparation of the program under a different aspect ratio and growth density CdS nanoparticles array samples were assembled into various piezoelectric nano-generator model, current output characteristics of these nano-generator test and compare . Using ultrasonic piezoelectric nano-generator one-dimensional cadmium sulfide (CdS) nano-arrays prepared to drive and generator management analysis. The analysis found that the length of the nanowire growth density under the ultrasonic driving conditions of the outside world, help improve the strength of the current output of the piezoelectric nano-generator. Meanwhile, the application of the one-dimensional cadmium sulfide (CdS) nanowire arrays were successfully prepared the new nano-generator of electromagnetic energy into electrical energy, and the production of nano-generator using CdS samples prepared under different conditions The current output characteristics, the distance between electromagnetic radiation signal with nano-generators, the angle of the generator current output characteristics. In addition, theoretical analysis and management of its generators. The CdS semiconductor material with its excellent optical and electrical properties, signal detection, the field of optoelectronic devices such as sensors, MEMS has broad application prospects.

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