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ACS Appl Mater Interfaces

Title:		Specific and Highly Sensitive Detection of Ketone Compounds Based on p-Type MoTe(2) under Ultraviolet Illumination
Author(s):		Wu E; Xie Y; Yuan B; Hao D; An C; Zhang H; Wu S; Hu X; Liu J; Zhang D;
Address:
Journal Title:		ACS Appl Mater Interfaces
Year:		2018
Volume:		20181003
Issue:		41
Page Number:		35664 - 35669
DOI:		10.1021/acsami.8b14142
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"The selective and sensitive detection of chemical agents is demanded by a wide range of practical applications. In particular, sensing of volatile organic compounds (VOCs) at parts-per-billion level is critical for environmental monitoring, process control, and early diagnosis of human diseases. In this report, we demonstrate a specific and highly sensitive detection of ketone compounds using two-dimensional (2D) molybdenum ditelluride (MoTe(2)). We investigated the effects of UV activation on the sensing performance to a variety of VOCs. It is found that the MoTe(2) field-effect transistor (FET) exhibits an opposite sensing response to ketone compounds before and after UV light activation, whereas the responses to other types of VOCs remain in the same direction regardless of the illumination. This unique behavior enables the discriminative detection of ketone molecules including acetone and pentanone from other VOCs in a gas mixture. The activation of UV light also results in a very high sensitivity and low detection limit toward acetone ( approximately 0.2 ppm). Moreover, the MoTe(2) FET shows a stable sensing performance in a high humidity environment. The results demonstrate the potential of MoTe(2) as a promising candidate for high-performance acetone sensors in important applications such as human breath analysis. The scheme of light-tunable sensing can be applied to a broad range of sensing platforms based on 2D materials"
Keywords:		MoTe2 Uv VOCs acetone discriminative detection;
Notes:		"PubMed-not-MEDLINEWu, Enxiu Xie, Yuan Yuan, Bo Hao, Dongyue An, Chunhua Zhang, Hao Wu, Sen Hu, Xiaodong Liu, Jing Zhang, Daihua eng 2018/09/25 ACS Appl Mater Interfaces. 2018 Oct 17; 10(41):35664-35669. doi: 10.1021/acsami.8b14142. Epub 2018 Oct 3"