Enhanced acetone sensor based on Au functionalized In-doped ZnSnO3 nanofibers synthesized by electrospinning method
Enhanced acetone sensor based on Au functionalized In-doped ZnSnO3 nanofibers synthesized by electrospinning method
复制标题
静电纺丝法合成的基于Au功能化In掺杂ZnSnO3纳米纤维的增强型丙酮传感器
DOI：
10.1016/j.jcis.2019.02.055
复制
发表时间：
2019-05-01
影响因子：
9.9
通讯作者：
Xu, Xiaoli
中科院分区：
文献类型：
--
作者：
Chen, Qiong;Wang, Yuhua;Xu, Xiaoli
贵金属修饰是制备化学电阻式气敏传感器的一种有价值的方法。本文采用静电纺丝技术制备了一系列Au负载In掺杂的ZnSnO 3纳米纤维。采用场发射X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、元素分析、X射线光电子能谱（XPS）和比表面积（BET）等分析手段对材料的晶体结构、形貌和化学组成进行了表征。最佳的传感器是基于0.25 mol% Au负载In掺杂ZnSnO 3纳米纤维，可以有效地检测50 ppm丙酮，它具有高响应（19.3）和快速响应/恢复时间（10/13 s）在较低的工作温度（200 ℃）。Au的适当引入是提高气敏性能的主要原因。由于Au纳米颗粒的电子催化作用在Au和ZnSnO 3界面产生了肖特基势垒型结，可以引起电阻的巨大变化，从而获得高灵敏度，同时Au纳米颗粒的化学催化作用促进了气体分子的化学吸附和解离，从而加速了与气敏材料的反应。此外，Au负载的In掺杂ZnSnO 3气敏元件在不同湿度条件下均表现出一定的稳定性，表明Au纳米颗粒的负载可以抑制水蒸气对气敏性能的负面影响。(C)2019爱思唯尔公司All rights reserved.
Nobel metal modification could be a valuable method for the fabrication of advanced chemiresistive gas sensor. Herein, a series of Au loaded In-doped ZnSnO3 nanofibers were prepared via electrospinning technique. The crystal structure, morphology and chemical composition of the synthesized materials were characterized by field-emission X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), elemental mapping, X-ray photoelectron spectroscopy (XPS) and Brunauere-Emmette-Teller (BET) analyses. The optimal sensor, which was based on 0.25 mol% Au loaded In-doped ZnSnO3 nanofibers, could detect 50 ppm acetone effectively, it possessed a high response (19.3) and fast response/recovery time (10/13 s) at low operating temperature (200 degrees C). The enhanced gas sensing performance was mainly derived from proper introduction of Au. Since the electronic catalysis of Au nanoparticles created Schottky barrier-type junctions at Au and ZnSnO3 interfaces which could cause tremendous change of resistance and induce to high sensitivity, meanwhile the chemical catalysis of Au nanoparticles promoted the chemisorption and dissociation of gas molecules which could accelerate the reaction with gas sensing material. Moreover, the Au loaded In-doped ZnSnO3 sensors displayed certain stability under different humidity condition, it meant that the negative influence of water vapor on gas sensing performance could be inhibited by loading Au nanoparticles. (C) 2019 Elsevier Inc. All rights reserved.