摘要
利用水热法制备了六方晶相WO3纳米线,研究了单根WO3纳米线在不同条件下的伏安特性。结果表明:在空气环境中,所制WO3纳米线具有线性伏安特性,其电导率约为1.7×10–3S/cm。在紫外光激励下,由于气体吸附、W6+与W5+的相互转换,WO3纳米线的电导率逐渐增加为原来的200倍左右;在氨气环境中,由于氧空位的产生和扩散,WO3纳米线的I-V特性曲线呈回滞现象,其电导率随紫外光激励时间的增加而迅速增加为原来的100倍左右。该水热法合成的WO3纳米线对NH3具有很好的气敏性。
Tungsten trioxide nanowires with hexagonal phase structure were synthesized by hydrothermal method. The I-V characteristics of an individual WO3 nanowire in different conditions were investigated. The results show that, the 1-V characteristics curves of the prepared WO3 nanowire appear linearity in air environment, and its conductivity is about 1.7× 10^-3 S/cm. Under the UV irradiation, the conductivity of WO3 nanowires increases by about 200 times of the original due to the gas adsorption and the mutual conversion of W6＋ and W5＋. Because of the creation and diffusion of oxygen vacancy in NH3 environment, the I-V curves of the sample appear hysteresis characteristic and its conductivity increases rapidly by about 100 times of the original with the increasing of ultraviolet excitation time. The experimental results also suggest that the prepared hexagonal WO3 nanowires exhibit good sensitivity to NH3.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2013年第6期31-33,共3页
Electronic Components And Materials
基金
湖南省教育厅科学研究资助项目(No.11C1191)
湘南学院科研基金资助项目(No.2010Y064)
关键词
水热法
三氧化钨
六方晶相
纳米线
紫外光照
伏安特性
回滞现象
hydrothermal method
tungsten trioxide
hexagonal
nanowire
UV irradiation
I-V characteristics
hysteresis characteristic
