Synthesis, characterization and optical properties of ZnO nanoparticles with controlled size and morphology
Synthesis, characterization and optical properties of ZnO nanoparticles with controlled size and morphology
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DOI：
10.1016/j.jcrysgro.2009.06.028
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发表时间：
2009-08-01
影响因子：
1.8
通讯作者：
Jouini, Noureddine
中科院分区：
文献类型：
--
作者：
Dakhlaoui, Amel;Jendoubi, Mouna;Jouini, Noureddine
采用改进的多元醇法合成了氧化锌单分散纳米颗粒，无需使用催化剂或高温煅烧步骤。通过使用几个合成参数（温度、碱比、水解比等）来调节所得氧化物颗粒的形态和尺寸。碱比的增加导致了精细颗粒形貌的巨大变化，从不规则和各向异性的形式（圆锥形，纳米棒状和椭圆形）演变为球形。这些颗粒的生长机制，提出了作为合成参数的函数的红锌矿晶体结构和形态演变的基础上。光致发光光谱显示紫外-激子和可见光发射带。在纳米棒状颗粒中观察到最强的可见光发射强度，这意味着该样品中氧空位的比例增加。1 μ m长的棒状颗粒显示出占主导地位的紫外发射，这证明了它们改进的化学计量比。(C)2009年由Elsevier B. V.出版
Zinc oxide monodispersed nanoparticles were synthesized using a modified polyol process without any requirement to use a catalyst or calcination step at high temperature. The morphology and the size of the resulting oxide particles were adjusted by using several synthesis parameters (temperature, alkaline ratio, hydrolysis ratio, etc.). The increasing of the alkaline ratio results in a great change of the elaborated particles morphology that evolved from irregular and anisotropic forms (conical, nanorod-like and elliptical) to spherical one. A growth mechanism of these particles was proposed on the basis of zincite crystal structure and the morphology evolution as a function of the synthesis parameters. The photoluminescence spectra show UV-excitonic and visible emission bands. The strongest intensity of the visible emission was observed in nanorod-like particles, which implies an increased fraction of oxygen vacancies in this sample. The rod-like particles with 1 mu m length show the dominant UV-emission, which evidences their improved stoichiometry. (C) 2009 Published by Elsevier B.V.