氧化剂
化学吸附
吸附
磷
半导体
材料科学
分子
朗缪尔吸附模型
无机化学
化学
化学物理
物理化学
光电子学
有机化学
冶金
作者
Qiang Zhu,Hao Wang,Jun Yang,Changsheng Xie,Dawen Zeng,Ni Zhao
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2018-11-20
卷期号:3 (12): 2629-2636
被引量:20
标识
DOI:10.1021/acssensors.8b01041
摘要
Black and blue phosphorus (both allotropes of elementary phosphorus) have recently been widely explored as an active material for electronic devices, and their potential in gas sensing applications has been demonstrated. On the other hand, amorphous red phosphorus (a-RP), a much cheaper and readily available phosphorus allotrope, has seldom been investigated as an electronic material, and its gas sensing properties have never been studied. In this work we have investigated these properties of a-RP by combining experimental characterizations with theoretical calculations. We found that a-RP exhibited an amphoteric character for detecting both commonly regarded reducing and oxidizing gas molecules, featuring a negative correlation between the electrical resistance of a-RP and the gas concentration. Interestingly, the a-RP based sensors appear to be particularly suitable for room-temperature NO2 detection, exhibiting excellent sensitivity and selectivity, as well as fast temporal response and recovery. A unique sensing feature of a-RP toward NO2 was identified, which is associated with the expansion of P–P bonds upon NO2 chemisorption. Based on density functional theory calculations we proposed a physiochemical model to elaborate the synergistic effects of the P–P bond expansion and Langmuir isotherm adsorption on the electronic properties and gas sensing processes of a-RP.
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