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Small Methods

Title:		Boosting Electrical Response toward Trace Volatile Organic Compounds Molecules via Pulsed Temperature Modulation of Pt Anchored WO(3) Chemiresistor
Author(s):		Dai T; Yan Z; Li M; Han Y; Deng Z; Wang S; Wang R; Xu X; Shi L; Tong W; Bao J; Qiao Z; Li L; Meng G;
Address:		"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, and Key Lab of Photovoltaic and Energy Conservation Materials, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, P. R. China. ICQD, Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China. School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, Linfen, 041004, P. R. China. Department of Physics, Fuzhou University, Fuzhou, Fujian, 350108, P. R. China. Advanced Laser Technology Laboratory of Anhui Province, Hefei, 230037, P. R. China. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Science, Hefei, 230031, P. R. China. School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Center for Energy Conversion Materials & Physics (CECMP), Soochow University, Suzhou, 215006, P. R. China"
Journal Title:		Small Methods
Year:		2022
Volume:		20220826
Issue:		10
Page Number:		e2200728 -
DOI:		10.1002/smtd.202200728
ISSN/ISBN:		2366-9608 (Electronic) 2366-9608 (Linking)
Abstract:		"Insufficient limit of detection (LoD) toward volatile organic compounds (VOCs) hinders the promising applications of metal oxide chemiresistors in emerging air quality monitoring and/or breath analysis. There is an inherent limitation of widely adopted strategies of creating sensitive chemiresistors then operating at the optimized temperature via a continuous heating (CH) mode. Herein, a strategy combining Pt single atoms anchoring (chemical sensitization) with pulsed temperature modulation (PTM, physical sensitization) is proposed. Apart from generating abundant surface asymmetric oxygen vacancy (Pt-V(O) -W) active sites at pulsed high temperature (HT) stage, inward diffusion of trace target VOCs across the sensing layer at pulsed low temperature stage (driven by PTM induced concentration gradient), can greatly enhance the charge interaction probability between the generated surface active species and the surrounding VOCs, and thus offers a novel avenue on addressing the bottleneck issue of low LoD by PTM. Triggered by HT of 300 degrees C, the responses of Pt anchored WO(3) chemiresistor to 1 ppm trimethylamine (TMA) and xylene can be drastically boosted from 1.9 (CH) to 6541.5 (PTM) and 1.5 (CH) to 1001.1 (PTM), respectively. And ultra-low theoretic LoD of 0.78 ppt (TMA) and 0.18 ppt (xylene) are successfully achieved, respectively"
Keywords:		*Volatile Organic Compounds/analysis Temperature Xylenes/analysis Oxides Oxygen asymmetric oxygen vacancy defects inward gas diffusion oxide chemiresistors pulsed temperature modulation trace VOCs detection;
Notes:		"MedlineDai, Tiantian Yan, Zhi Li, Meng Han, Yulei Deng, Zanhong Wang, Shimao Wang, Ruyang Xu, Xiaohong Shi, Lei Tong, Wei Bao, Jun Qiao, Zhenhua Li, Liang Meng, Gang eng 11674324/CAS Pioneer Hundred Talents Program from Chinese Academy of Sciences, National Natural Science Foundation of China/ 52025028/CAS Pioneer Hundred Talents Program from Chinese Academy of Sciences, National Natural Science Foundation of China/ 62075223/CAS Pioneer Hundred Talents Program from Chinese Academy of Sciences, National Natural Science Foundation of China/ GJHZ202101/CAS-NSTDA/ PECL2021QN001/Key Lab of Photovoltaic and Energy Conservation Materials/ Germany 2022/08/27 Small Methods. 2022 Oct; 6(10):e2200728. doi: 10.1002/smtd.202200728. Epub 2022 Aug 26"