水解锌制备Zn/ZnO纳米结构及其光学性能研究  

Synthesis and Optical Properties of Zn/ZnO Nanostructure by Hydrolyze Zn Nanoparticles

作　　者：陈星建[1] 王树林[2] 丁浩冉[1] 徐波[1] 

机构地区：[1]上海理工大学动力学院,上海200093 [2]上海理工大学材料学院,上海200093

出　　处：《材料导报》2011年第4期134-137,共4页Materials Reports

基　　金：国家自然基金项目(50575147);上海市教委重点资助项目(J50503)

摘　　要：利用滚压振动磨在干法室温条件下将金属锌制备成尺度约为3～5nm的锌量子点，并使产物与水蒸气在250℃进行化学反应，得到纳米氧化锌或纳米氧化锌与锌的混合物。分别利用能量发射谱仪（EDS）、透射电镜（TEM）对样品成分和形貌进行了表征。结果表明，250℃反应温度下得到的产物具有良好的分散性，其特征是棒状和片状结构共存，而且纳米棒具有显著的沿[011^-1]晶向生长的趋势。室温下光致发光（PL）谱显示，在360nm和388nm处有双紫外发射峰，属于激子态发光，双紫外发射峰可能与掺杂能级有关；同时，在496nm处有蓝光发射峰，在515nm处有绿光发射峰，这两种发射属于表面缺陷态发光。对各种发光峰的发光机制进行了讨论。UV-Vis吸收光谱表明，产物在紫外区有很强的紫外吸收．吸收峰出现了蓝移现象，验证了Zn纳米量子点的掺杂形成掺杂能级，也与测得的可见光发射一致。Zinc quantum dots of 3 - 5nm were manufactured using roller vibration milling in dry mode and at room temperature, and hydrolyzed with steam under 250℃ to obtain hybrid of ZnO and Zn nanostructures. The assynthesized particles were characterized by XRD, EDS, and TEM. The result shows that the nano-structures synthesized at 250℃ have the high dispersivity featuring with nano flakes and nano-rods, which grow along the [011^-1] direction. Room temperature PL shows that double ultraviolet band emission peaks are at around 360nm and 388nm corresponding to the near band-edge emission, respectively. Double ultraviolet band emission may be related to adulteration of Zn nanoparticles. Room temperature PL also shows that a blue band peak is at around 496nm and a green band peak is at around 515nm, which can be ascribed to the surface defects of the materials. UV-Vis spectrum analysis reveals that Zn/ZnO nanostructure has strong absorbing peak and some bluc-shift in the UV area. The bluc-shift manifests the aduheration of Zn nanoparticles, which may be the origin of the visible light emission.

关 键 词：滚压振动磨 纳米结构 水解反应 光致发光性能 

分 类 号：TN304.21[电子电信—物理电子学]