摘要
用溶剂热方法合成了ZnC2O4.2H2O纳米棒的中间体,在不同热处理条件下获得ZnO的玉米棒、颗粒片、链结构等不同形貌,从而实现对ZnO的形貌进行控制.室温下,ZnO在250 nm的紫外光激发下,在400 nm处出现一个近带发射峰.这种发光峰属于ZnO中的缺陷发光.对ZnO的形成机理做出了热重和红外分析,并对ZnO的形成机理提出了一种可能的解释.溶剂热方法获得的ZnC2O4.2H2O纳米棒在高温下分解成ZnO.在退火过程中,中间体会先形成空洞,然后形成带颗粒的纳米棒;但是这种纳米棒开始会粘接在一起形成片状,然后纳米片会卷曲成玉米棒结构,最终玉米棒散掉,形成纳米链.
ZnC2O4·2H2O nanorods were prepared in a solvothermal-assisted heat treatment method. Different shapes of ZnO, including nano-cornlike-rod, nanosheet and nanochain, were controlled by different annealing temperatures. The near-band ultraviolet emission spectrum of the corn-like ZnO nanorods had one peak at 400 nm under 250 nm excitation at room temperature. A possible mechanism for the formation of the corn-like ZnO nanorods was also discussed briefly. ZnC2O4· 2H2O prepared by solvothermal process would decompose to ZnO at high temperature. In the decomposition process, middle product produced some holes at first, and then produced particles which were stringed to nanorods. As the annealing process continued, nanorods adhibited to nanosheets, and then rolled to nanocorn. Finally, nanocorns dispersed to nanochains.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第5期57-62,共6页
Journal of Hunan University:Natural Sciences
基金
教育部博士点基金资助项目(20070532043)
博士后科学基金资助项目(20080431020)
关键词
ZNO
纳米材料
形貌控制
发射光谱
ZnO
nanoparticle shape-controlling
emission spectrum
