调整氧气在硫化铋顶面的注入作用,改变活性电子传递路径,制造柔性二氧化氮传感器

IF 31.6 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiaowu Wang , Yang Chen , Zhigang Zeng , Muyu Yan , Xin Jia , Pengfei Hu , Jing Xu , Zhenggang Xue , Jiaqiang Xu
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引用次数: 0

摘要

精确调整催化剂的表面电子状态,实现吸附位点的优化设计,对于表面相关的气体传感反应至关重要。在此,我们基于分子轨道理论和 p 带模型,开发了一种出色的表面注氧方法,可同时增强能级排列重叠(ELA)和降低表面 Bi p 带与吸附的 NO2 分子之间的反键填充(ABF)水平,从而获得最佳的 NO2 吸附模式和传感性能。通过控制氧气渗透浓度,具有有序核/无序壳构型的弱氧化 Bi2S3-200 催化剂表现出卓越的二氧化氮气体灵敏度(12.5% 至 1 ppm)和较低的实验检测限(100 ppb),超过了大多数已报道的二氧化氮传感器。原位 XPS 表征进一步证明,弱氧化的无定形铋物种可作为活性吸附中心,改变二氧化氮环境中的电子传递路径。最后,通过将柔性 MEMS 传感器阵列插入多功能无线传感装置,Bi2S3-200 传感器可在室温下实现 NO2/温度/湿度的实时监测和云数据传输,从而为作物健康监测和精准农业的发展铺平道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tailoring the injection action of oxygen over top-surface of bismuth sulfide to change reactive electron transfer path for flexible NO2 sensors

Precisely tailoring the surface electronic state of catalysts to realize the optimal design of adsorption sites is essential to the surface-related gas-sensing reaction. Herein, based on both molecular orbital theory and p-band models, we develop a brilliant surface oxygen-injected method to simultaneously enhance the overlap of energy-level alignment (ELA) and reduce the anti-bonding filling (ABF) level between surface Bi p-band and adsorbed NO2 molecule, leading to an optimal NO2 adsorption mode and sensing performance. By controlling the oxygen permeation concentrations, the weak-oxidized Bi2S3-200 catalysts with ordered core/disordered shell configuration exhibit excellent NO2 gas sensitivity (12.5 % to 1 ppm) and low experimental detection limit (100 ppb), surpassing that of most reported NO2 sensors. Ex situ XPS characterizations further demonstrate that the weak-oxidized amorphous Bi species can serve as active adsorption centers to alter the electron transfer path in NO2 atmosphere. Finally, through inserting flexible MEMS sensors array into multifunctional wireless sensing device, the Bi2S3-200 sensors can realize real-time NO2/temperature/humidity monitoring and cloud data transmission at room temperature, which thereby pave the way for the development of crop health monitor and precision agriculture.

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来源期刊
Materials Science and Engineering: R: Reports
Materials Science and Engineering: R: Reports 工程技术-材料科学:综合
CiteScore
60.50
自引率
0.30%
发文量
19
审稿时长
34 days
期刊介绍: Materials Science & Engineering R: Reports is a journal that covers a wide range of topics in the field of materials science and engineering. It publishes both experimental and theoretical research papers, providing background information and critical assessments on various topics. The journal aims to publish high-quality and novel research papers and reviews. The subject areas covered by the journal include Materials Science (General), Electronic Materials, Optical Materials, and Magnetic Materials. In addition to regular issues, the journal also publishes special issues on key themes in the field of materials science, including Energy Materials, Materials for Health, Materials Discovery, Innovation for High Value Manufacturing, and Sustainable Materials development.
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