High-performance humidity sensor using Schottky-contacted SnS nanoflakes for noncontact healthcare monitoring

Tang, Hongyu1,2,3; Li, Yutao2; Ye, Huaiyu4,5,6,7; Hu, Fafei6,7; Gao, Chenshan6,7; Tao, Luqi6,7; Tu, Tao2; Gou, Guangyang2; Chen, Xianping6,7; Fan, Xuejun8; Ren, Tianling2; Zhang, Guoqi1

2020-01-24

10.1088/1361-6528/ab414e

NANOTECHNOLOGY   影响因子和分区

0957-4484

1361-6528

Humidity sensors based on flexible sensitive nanomaterials are very attractive in noncontact healthcare monitoring. However, the existing humidity sensors have some shortcomings such as limited sensitivity, narrow relative humidity (RH) range, and a complex process. Herein, we show that a tin sulphide (SnS) nanoflakes-based sensor presents high humidity sensing behaviour both in rigid and flexible substrate. The sensing mechanism based on the Schottky nature of a SnS-metal contact endows the as-fabricated sensor with a high response of 2491000% towards a wide RH range from 3% RH to 99% RH. The response and recovery time of the sensor are 6 s and 4 s, respectively. Besides, the flexible SnS nanoflakes-based humidity sensor with a polyimide substrate can be well attached to the skin and exhibits stable humidity sensing performance in the natural flat state and under bending loading. Moreover, the first-principles analysis is performed to prove the high specificity of SnS to the moisture (H2O) in the air. Benefiting from its promising advantages, we explore some application of the SnS nanoflakes-based sensors in detection of breathing patterns and non-contact finger tips sensing behaviour. The sensor can monitor the respiration pattern of a human being accurately, and recognize the movement of the fingertip speedily. This novel humidity sensor shows great promising application in physiological and physical monitoring, portable diagnosis system, and noncontact interface localization.

humidity sensor SnS nanoflakes healthcare monitoring noncontact sensation Schottky-contact

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51706029]

Science & Technology - Other Topics ; Materials Science ; Physics

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000494488300001

IOP PUBLISHING LTD

20194807764421

Health care ; Humidity sensors ; IV-VI semiconductors ; Layered semiconductors ; Pattern recognition ; Sulfur compounds

Meteorological Instrumentation:443.2 ; Health Care:461.7

MATERIALS SCIENCE

Web of Science

1.Delft Univ Technol, Delft Dept Microelect, Fac Elect Math & Informat, NL-2628 CD Delft, Netherlands
2.Tsinghua Univ, Inst Microelect, Beijing 100084, Peoples R China
3.Changzhou Inst Technol Res Solid State Lighting, Changzhou 21161, Peoples R China
4.Southern Univ Sci & Technol, Sch Microelect, Shenzhen 518055, Peoples R China
5.Shenzhen Inst Wide Bandgap Semicond, Shenzhen 518055, Guangdong, Peoples R China
6.Chongqing Univ, Educ Minist China, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China
7.Chongqing Univ, Coll Optoelect Engn, Chongqing 400044, Peoples R China
8.Lamar Univ, Dept Mech Engn, Beaumont, TX 77710 USA

Tang, Hongyu,Li, Yutao,Ye, Huaiyu,et al. High-performance humidity sensor using Schottky-contacted SnS nanoflakes for noncontact healthcare monitoring[J]. NANOTECHNOLOGY,2020,31(5).

Tang, Hongyu.,Li, Yutao.,Ye, Huaiyu.,Hu, Fafei.,Gao, Chenshan.,...&Zhang, Guoqi.(2020).High-performance humidity sensor using Schottky-contacted SnS nanoflakes for noncontact healthcare monitoring.NANOTECHNOLOGY,31(5).

Tang, Hongyu,et al."High-performance humidity sensor using Schottky-contacted SnS nanoflakes for noncontact healthcare monitoring".NANOTECHNOLOGY 31.5(2020).