Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2020-01-14 , DOI: 10.1016/j.snb.2020.127716 Kaixin Chen , Huan Lu , Gang Li , Jinniu Zhang , Yonghong Tian , Ying Gao , Quanmin Guo , Hongbing Lu , Jianzhi Gao
Different from the dominant method of surface modification of metal oxide sensing materials with noble metals, a simple and low-cost method is developed by using Zn nanoparticles as a surface modifier in this work. The first step involves the fabrication of porous In2O3 nanofibers by an electrospinning technique, and then Zn nanoparticles decorated In2O3 nanofibers are constructed by a simple thermal evaporation method. An increase in surface species absorbing capability and a decrease in sensor resistance are observed by surface modification of In2O3 nanofibers with Zn nanoparticles. In comparison with pure In2O3 nanofibers, this kind of Zn–In2O3 composite nanofibers display higher response and better selectivity to NO2. The response of Zn–In2O3 nanofibers is up to 130.00 to 5 ppm NO2 at 50 °C, which is 13.7 times higher than that of pure In2O3. From our perspective, the improved NO2 sensing performances of Zn–In2O3 composite nanofibers are mainly attributed to the enhanced resistance modulation because of the formation of ohmic contacts between Zn nanoparticles and In2O3 nanoparticles.
中文翻译:
具有Zn纳米颗粒的In 2 O 3纳米多孔纤维的表面功能化,以增强低温NO 2感测性能
与使用贵金属对金属氧化物感测材料进行表面改性的主要方法不同,这项工作中使用锌纳米粒子作为表面改性剂,开发了一种简单且低成本的方法。第一步涉及通过静电纺丝技术制造多孔In 2 O 3纳米纤维,然后通过简单的热蒸发方法构造装饰有In 2 O 3纳米纤维的Zn纳米颗粒。表面增加通过用Zn纳米粒子对In 2 O 3纳米纤维进行表面改性,可以观察到这种物质的吸收能力和传感器电阻的降低。与纯In 2 O 3纳米纤维相比,这种Zn-In 2 O 3复合纳米纤维表现出更高的响应性和对NO 2的更好选择性。Zn-In 2 O 3纳米纤维在50°C下的响应高达130.00至5 ppm NO 2,是纯In 2 O 3的13.7倍。从我们的角度来看,改善了Zn–In 2 O的NO 2感测性能3复合纳米纤维主要归因于增强的电阻调制,因为在Zn纳米粒子和In 2 O 3纳米粒子之间形成了欧姆接触。