Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 296, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.126710
Keywords
Flower-like SnO2; Pt-doped; Methane; Gas sensing performance; Density functional theory
Funding
- National Natural Science Foundation of China [U1704255]
- Zhongyuan Thousand Talent ProgramZhongyuan Young Top-notch Talents [ZYQR201810133]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [19HASTIT042]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF1606, NSFRF1614]
- Research Foundation for Youth Scholars of Higher Education of Henan Province [2017GGJS053]
- Program for Innovative Research Team of Henan Polytechnic University [T2018-2, T2019-1]
- Foundation for Distinguished Young Scientists of Henan Polytechnic University [J2017-3]
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Pt-doped flower-like SnO2 nanocomposites were successfully synthesized by hydrothermal process, followed by a simple thermal reduction method. And, their morphology, composition and structure were thoroughly studied. The gas sensing performance of undoped and Pt-doped SnO2 gas sensors for methane were systematically investigated. Results indicate that Pt-doped SnO2 nanoflowers (NFs) not only significantly improve the sensitivity, but also reduce the optimal operating temperature compared to undoped SnO2 sensors. Moreover, it improves the stability and selectivity of the SnO2 gas sensor. Combined with adsorption energy and density of states of undoped SnO2 and Pt-doped SnO2 supercells for O-2 and CH4 molecules calculated using first principles based on density functional theory (DFT), it is revealed that the excellent methane gas sensing performance of Pt-doped SnO2 sensor is mainly attributed to the chemical sensitization of Pt dopant to methane gas. Simultaneously, the electronic sensitization of the Schottky junction formed between Pt and SnO2, and the unique Pt-doped SnO2 NFs structure is also beneficial for gas sensing performance.
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