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ACS Appl Mater Interfaces

Title:		Wafer-Scale Synthesized MoS(2)/Porous Silicon Nanostructures for Efficient and Selective Ethanol Sensing at Room Temperature
Author(s):		Dwivedi P; Das S; Dhanekar S;
Address:		"Centre for Applied Research in Electronics, Indian Institute of Technology (IIT) , Hauz Khas, New Delhi - 110016, India"
Journal Title:		ACS Appl Mater Interfaces
Year:		2017
Volume:		20170612
Issue:		24
Page Number:		21017 - 21024
DOI:		10.1021/acsami.7b05468
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"This paper presents the performance of a highly selective ethanol sensor based on MoS(2)-functionalized porous silicon (PSi). The uniqueness of the sensor includes its method of fabrication, wafer scalability, affinity for ethanol, and high sensitivity. MoS(2) nanoflakes (NFs) were synthesized by sulfurization of oxidized radio-frequency (RF)-sputtered Mo thin films. The MoS(2) NFs synthesis technique is superior in comparison to other methods, because it is chip-scalable and low in cost. Interdigitated electrodes (IDEs) were used to record resistive measurements from MoS(2)/PSi sensors in the presence of volatile organic compound (VOC) and moisture at room temperature. With the effect of MoS(2) on PSi, an enhancement in sensitivity and a selective response for ethanol were observed, with a minimum detection limit of 1 ppm. The ethanol sensitivity was found to increase by a factor of 5, in comparison to the single-layer counterpart levels. This impressive response is explained on the basis of an analytical resistive model, the band gap of MoS(2)/PSi/Si, the interface formed between MoS(2) and PSi, and the chemical interaction of the vapor molecules and the surface. This two-dimensional (2D) composite material with PSi paves the way for efficient, highly responsive, and stable sensors"
Keywords:		VOC sensor heterojunctions layered materials molybdenum disulfide (MoS2) porous silicon;
Notes:		"PubMed-not-MEDLINEDwivedi, Priyanka Das, Samaresh Dhanekar, Saakshi eng 2017/05/30 ACS Appl Mater Interfaces. 2017 Jun 21; 9(24):21017-21024. doi: 10.1021/acsami.7b05468. Epub 2017 Jun 12"