摘要
在室温下,利用超声活化法将机械研磨13h的Zn粉在V(水)∶V(环己烷)=19∶1的分散体系中合成ZnO纳米颗粒悬浮液,然后通过光还原AgNO3制备出ZnO/Ag纳米复合材料。并用X射线粉末衍射仪(XRD)、透射电子显微镜(TEM)对ZnO/Ag复合颗粒表征,用扫描电子显微镜(SEM)和探针台I-V测试仪对ZnO/Ag复合薄膜表征和电学性能测试,通过XRD和TEM得出,超声合成的ZnO具有六方纤锌矿结构,长约20nm的短棒状;经光还原沉积在其表面的纳米Ag呈现面心立方结构,直径约为5nm。通过SEM和I-V伏安特性曲线得出,干燥温度对复合结构有较大影响,60℃干燥的复合薄膜比较致密均匀,导通电压大约2V左右,在100℃时开始转变为有氧化锌附着的枝状银网状复合物,导通电压在0.02V左右,通过控制干燥温度可改变复合薄膜中ZnO和Ag的结合方式以及相应的电学性能。
At room temperature,ZnO nanopartikel-suspension was prepared by ultrasonic method in the dispers-ed system of water and hexane (1 9∶1)with Zn which was processed by mechanical milling for 13 h.Then,Ag-NO 3 was photoredued to prepare ZnO/Ag nanocomposites.The XRD and TEM were use to analyze ZnO/Ag composite particles.The SEM and I-V tester were use to test ZnO/Ag composite thin films and electrical prop-erties.The results of XRD and TEM showed that ZnO synthesized by ultrasonic method was short rod-like with the wurzite hexagonal structure and length of about 20 nm;the structure of Ag nano-particles on the surface of ZnO by photo-reduction method was face-centered cubic.The SEM and I-V results revealed that drying temper-ature had a great influence on the composite structure.When drying temperature was 60 ℃,the composite thin film had compact and uniform structure and break-over voltage was about 2 V;when drying temperature was 100 ℃,the structure of the composite thin film was transformed into the Ag network of composites with ZnO branches and break-over voltage was about 0.02 V.By controlling the drying temperature,combinations of ZnO with Ag in composite thin films and the electrical properties could be changed.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2014年第7期7035-7038,共4页
Journal of Functional Materials
基金
国家教育部博士点基金资助项目(20113120110005)
上海市纳米专项资助项目(1052nm02900)