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Preparation of ZnO Micro/Nano Material and Doping by CVD

Author: LanFeiFei
Tutor: WangJinZhong
School: Harbin Institute of Technology
Course: Functional Materials and Devices
Keywords: CVD ZnO micon/nano strcutrues PL XPS
CLC: O614.241
Type: Master's thesis
Year: 2012
Downloads: 35
Quote: 0
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Abstract


ZnO has a great potensical application in the field of photoelectronics owing to itsnative structures and properties. Meanwhile doped-ZnO by transition metal andrare-earth elements can act as an excellent dilute semiconductor material.Therefor thepreparation and reasearch of undoped and doped ZnO have a great significance for theapplication of ZnO in different fields. In this article we have fabricated undpoed anddoped ZnO successfully by using a simple CVD method. The structrue and propertieshave been charactered by scanning electron microscope(SEM)、X-ray diffraction、Photoluminescence spectrum(PL)、X-ray photoelectron diffraction(XPS). The specificreasearches as follows:The research of intrinsic ZnO: different nanostructures of ZnO have been obtainedby CVD under different growing conditions. Using quartz glass as the subbstrate, weget the nanoneedles, and we researched the growth progress of ZnO on the quartz glass.On the surface of ITO glass the nanowires was fabricated, the transmition spectrum ofthe nanowires indicated that the absorption edges have a blueshift, when thetemperatured belows810℃. This may be caused by the forming of the morphology ofZnO under the low temperature. Through choosing the nitrate of Ni and Ag as catalystprecursor, we successfully get the nanoneedles、polypody shape eg, thruogh theanalysising of the two different catalyst, we find the growth processes of ZnO obeyvapor-solid epitaxy(VSE) and VLS respectively.Cu-doped ZnO: In this article we aim to using a CVD method to fabricating Cudoped ZnO. Choosing CuO as the precursor, using Carbon thermal reduction method,we succesfully obtained the nanobelts of ZnO at900℃,910℃,920℃,930℃. EDScomfirms the existence of Cu. We got the namocombs and the multistory structure thatconstituted by nanocombs on the coppers through the growth mechanism analysis of thenanobelts. Through the PL at room temperature indicates that the strength ratio of UVvisible increased as the rising of Cu in the nanobelts.Mn doped ZnO: choosing Mn as the doping source, we get the nanorod、nanocolumn、micronflowers with different sizes, and we confirm the existence of Mn2+.The Room temperature PL spectrum indecated the existence of Mn2+can restrain thephotoluminescence peak of the defects.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > The zinc Vice family (Ⅱ B group metal elements ) > Zinc Zn
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