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Title:		Bioinspired Flexible Volatile Organic Compounds Sensor Based on Dynamic Surface Wrinkling with Dual-Signal Response
Author(s):		Qu C; Wang S; Liu L; Bai Y; Li L; Sun F; Hao M; Li T; Lu Q; Li L; Qin S; Zhang T;
Address:		"i-Lab, Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), 398 Ruoshui Road, Suzhou, Jiangsu, 215123, P. R. China. Nano Science and Technology Institute, University of Science and Technology of China, 166 Renai Road, Suzhou, Jiangsu, 215123, P. R. China. Xi'an Jiaotong-Liverpool University, Department of Health and Environmental Sciences, 111 Renai Road, Suzhou, Jiangsu, 215123, P. R. China"
Journal Title:		Small
Year:		2019
Volume:		20190328
Issue:		17
Page Number:		e1900216 -
DOI:		10.1002/smll.201900216
ISSN/ISBN:		1613-6829 (Electronic) 1613-6810 (Linking)
Abstract:		"Living systems can respond to external stimuli by dynamic interface changes. Moreover, natural wrinkle structures allow the surface to switch dynamically and reversibly from flat to rough in response to specific stimuli. Artificial wrinkle structures have been developed for applications such as optical devices, mechanical sensors, and microfluidic devices. However, chemical molecule-triggered flexible sensors based on dynamic surface wrinkling have not been demonstrated. Inspired by human skin wrinkling, herein, a volatile organic compound (VOC)-responsive flexible sensor with a switchable dual-signal response (transparency and resistance) is achieved based on a multilayered Ag nanowire (AgNW)/SiO(x) /polydimethylsiloxane (PDMS) film. Wrinkle structures can form dynamically in response to VOC vapors (such as ethanol, toluene, acetone, formaldehyde, and methanol) due to the instability of the multilayer induced by their different swelling capabilities. By controlling the modulus of PDMS and the thickness of the SiO(x) layer, tunable sensitivities in resistance and transparency of the device are achieved. Additionally, the proximity mechanism of the solubility parameter is proposed, which explains the high selectivity of the device toward ethanol vapor compared with that of other VOCs well. This stimuli-responsive sensor exhibits the dynamic visual feedback and the quantitative electrical signal, which provide a novel approach for developing smart flexible electronics"
Keywords:		Acetone Dimethylpolysiloxanes/chemistry Elastic Modulus Ethanol Formaldehyde Gases Humans Limit of Detection Methanol Silver/chemistry Skin/*pathology Skin Aging/*drug effects Solubility Surface Properties Toluene Volatile Organic Compounds/*analysis *Wea;
Notes:		"MedlineQu, Chunyan Wang, Shuqi Liu, Lin Bai, Yuanyuan Li, Lianhui Sun, Fuqin Hao, Mingming Li, Tie Lu, Qifeng Li, Lili Qin, Sujie Zhang, Ting eng Research Support, Non-U.S. Gov't Germany 2019/03/29 Small. 2019 Apr; 15(17):e1900216. doi: 10.1002/smll.201900216. Epub 2019 Mar 28"