Surface functionalization of porous In2O3 nanofibers with Zn nanoparticles for enhanced low-temperature NO2 sensing properties
Surface functionalization of porous In2O3 nanofibers with Zn nanoparticles for enhanced low-temperature NO2 sensing properties
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DOI：
10.1016/j.snb.2020.127716
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
Kaixin Chen;H. Lu;Gang Li;Jinniu Zhang;Yonghong Tian;Ying Gao;Q. Guo;Hongbing Lu;Jianzhi Gao
中科院分区：
文献类型：
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作者：
Kaixin Chen;H. Lu;Gang Li;Jinniu Zhang;Yonghong Tian;Ying Gao;Q. Guo;Hongbing Lu;Jianzhi Gao
与传统的贵金属对金属氧化物敏感材料进行表面修饰的方法不同，本工作采用Zn纳米粒子作为表面修饰剂，开发了一种简单、低成本的方法。第一步是通过静电纺丝技术制备多孔In 2 O3纳米纤维，然后通过简单的热蒸发方法制备Zn纳米颗粒修饰的In 2 O3纳米纤维。用Zn纳米粒子对In 2 O3纳米纤维进行表面改性，可以提高In 2 O3纳米纤维表面O2物种的吸附能力，降低传感器电阻。与纯In 2 O3纳米纤维相比，这种Zn-In 2 O3复合纳米纤维对NO2具有更高的响应性和更好的选择性。Zn-In 2 O3纳米纤维在50 ℃下的响应高达130.00-5 ppm NO2，是纯In 2 O3的13.7倍从我们的角度来看，Zn-In 2 O3复合纳米纤维的NO 2传感性能的改善主要归因于Zn纳米颗粒和In 2 O3纳米颗粒之间形成欧姆接触，从而增强了电阻调制。
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 In 2 O 3 nanofibers by an electrospinning technique, and then Zn nanoparticles decorated In 2 O 3 nanofibers are constructed by a simple thermal evaporation method. An increase in surface O 2-species absorbing capability and a decrease in sensor resistance are observed by surface modification of In 2 O 3 nanofibers with Zn nanoparticles. In comparison with pure In 2 O 3 nanofibers, this kind of Zn–In 2 O 3 composite nanofibers display higher response and better selectivity to NO 2. The response of Zn–In 2 O 3 nanofibers is up to 130.00–5 ppm NO 2 at 50° C, which is 13.7 times higher than that of pure In 2 O 3. From our perspective, the improved NO 2 sensing performances of Zn–In 2 O 3 composite nanofibers are mainly attributed to the enhanced resistance modulation because of the formation of ohmic contacts between Zn nanoparticles and In 2 O 3 nanoparticles.