Achieving Molecular-Level Selective Detection of Volatile Organic Compounds through a Strong Coupling Effect of Ultrathin Nanosheets and Au Nanoparticles.

Autor:	Ou Y; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Zhai L; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Zhu G; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Zhang W; Institute of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, P.R. China., Huang X; Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom., Akdim O; Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom., Zhu L; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Nie J; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Rao F; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Huang Y; State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, P.R. China., Shi X; State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, P.R. China., Gao J; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Lu H; School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P.R. China., Hojamberdiev M; Institut für Chemie, Technische Universität Berlin, Straße des 17, Juni 135, Berlin 10623, Germany.
Jazyk:	angličtina
Zdroj:	ACS sensors [ACS Sens] 2024 Jan 26; Vol. 9 (1), pp. 139-148. Date of Electronic Publication: 2023 Dec 14.
DOI:	10.1021/acssensors.3c01777
Abstrakt:	The high density of surface active sites, high efficiency of interfacial carrier transport, and molecular diffusion path determine the efficiency of the electrochemical sensors. The ultrathin structures have atomic-level thickness, carrier migration and heat diffusion are limited in the two-dimensional plane, resulting in excellent conductivity and high carrier concentration. A one-step chemical method is applied to synthesize defect-rich Au-SnO 2 in an ultrathin nanosheet form (thickness of 2-3 nm). The strong interaction between Au and SnO 2 via the Au-O-Sn bonding and the catalytic effect of Au can prolong the service life via decreasing the optimal operating temperature (55 °C) and promote the Au-SnO 2 sensor to exclusively detect formaldehyde at the ppb level (300 ppb). The experimental findings along with theoretical study reveal that Au nanoparticles have a different effect on the competitive adsorption and chemical reaction over the surface of the Au-SnO 2 with formaldehyde and other interfering VOC gases, such as methanol, ethanol, and acetone. This study provides mechanistic insights into the correlation between operating temperature and the performance of the Au-SnO 2 chemiresistive sensor. This work allows the development of highly efficient and stable electrochemical sensors to detect VOC gases at room temperature in the future.
Databáze:	MEDLINE
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