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题名: Gas adsorption thermodynamics deduced from the electrical responses in gas-gated field-effect nanosensors
作者: Zu, Baiyi; Lu, Bin; Yang, Zheng; Guo, Yanan; Dou, Xincun; Xu, Tao
通讯作者: Dou, XC
刊名: Journal of Physical Chemistry C
发表日期: 2014
DOI: 10.1021/jp505279m
卷: 118, 期:26, 页:14703-14710
收录类别: SCI
摘要: Understanding the underlying physical chemistry governing the nanomaterial-based electrical gas sensing process is pivotal for the rational design of high-performance gas sensors. Herein, using a remarkable ppb-level NO2-gated field-effect nanosensor that is based on a reduced graphene oxide rGO/TiO2 nanoparticle heterojunction, as an exploratory platform, we have established a generic physical chemistry model to quantitatively gain insight into the correlation between the measured source-drain (S-D) current and the gas sorption thermodynamics in this NO 2 nanosensor. Based on thin-film field-effect transistor theory, the measured S-D current leads to the solution to the gas-induced gate voltage, which further solves the surface charge density using the Graham surface potential vs surface charge density function. Consequently, based on the Van't Hoff equation, key thermodynamic information can be obtained from this model including adsorption equilibrium constants and adsorption enthalpy of NO 2 on TiO2 nanoparticles. The acquisition of gas adsorption enthalpy provides a generic and nonspecific method to identify the nature of the adsorbed molecules.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/3761
Appears in Collections:环境科学与技术研究室_期刊论文

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作者单位: Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Urumqi 830011, Peoples R China;Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China;Univ Chinese Acad Sci, Beijing 100049, Peoples R China;No Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA

Recommended Citation:
Zu, Baiyi,Lu, Bin,Yang, Zheng,et al. Gas adsorption thermodynamics deduced from the electrical responses in gas-gated field-effect nanosensors[J]. Journal of Physical Chemistry C,2014,118(26):14703-14710.
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