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ACS Appl Mater Interfaces

Title:		Room Temperature Humidity Tolerant Xylene Sensor Using a Sn-SnO(2) Nanocomposite
Author(s):		Verma M; Bahuguna G; Saharan A; Gaur S; Haick H; Gupta R;
Address:		"Advanced Materials and Devices Laboratory, Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan342037, India. Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, Haifa3200003, Israel"
Journal Title:		ACS Appl Mater Interfaces
Year:		2023
Volume:		20230118
Issue:		4
Page Number:		5512 - 5520
DOI:		10.1021/acsami.2c22417
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"Xylene is one of the representative indoor pollutants, even in ppb levels, that affect human health directly. Due to the non-polar and less reactive nature of xylene, its room temperature detection is challenging. This work demonstrates a metallic tin-doped Sn-SnO(2) nanocomposite under controlled pH conditions via a simple solvothermal route. The Sn nanoparticles are uniformly distributed inside the SnO(2) nanospheres of approximately 70 nm with a high specific surface area of 118.8 m(2)/g. The surface of the Sn-SnO(2) nanocomposite exhibits strong affinity toward benzene, toluene, ethylbenzene, and xylene (BTEX) compared to other polar volatile organic compounds (VOCs) such as ethanol, acetone, isopropyl alcohol, formaldehyde, and chloroform tested in this study. The sensor's response is highest for xylene among BTEX molecules. Under ambient room temperature conditions, the sensor exhibits a linear response to xylene in the 1-100 ppm range with a sensitivity of approximately 255% at 60 ppm within approximately 1.5 s and recovers in approximately 40 s. The sensor is hardly affected by humidity variations (40-70%), leading to enhanced reliability and repeatability under dynamic environmental conditions. The meso and microporous nanosphere morphology act as a nanocontainer for non-polar VOCs to diffuse inside the nanostructures, providing easy accessibility. The metallic Sn increases the affinity for less reactive xylene at room temperature. Thus, the nanocatalytic Sn-SnO(2) nanocomposite is an active gas/VOC sensing material and provides an effective solution for sensing major indoor pollutants under humid conditions"
Keywords:		VOC sensor indoor pollution nanosphere tin oxide xylene;
Notes:		"PubMed-not-MEDLINEVerma, Mohit Bahuguna, Gaurav Saharan, Arpit Gaur, Snehraj Haick, Hossam Gupta, Ritu eng 2023/01/19 ACS Appl Mater Interfaces. 2023 Feb 1; 15(4):5512-5520. doi: 10.1021/acsami.2c22417. Epub 2023 Jan 18"