Nano-Micro Letters

Wearable Battery-Free Perspiration Analyzing Sites Based on Sweat Flowing on ZnO Nanoarrays

Wanglinhan Zhang1, 2, Hongye Guan1, Tianyan Zhong1, Tianming Zhao1, 2, Lili Xing1, Xinyu Xue1, 2, *

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Nano-Micro Lett. (2020) 12: 105

First Online: 02 May 2020 (Article)

DOI:10.1007/s40820-020-00441-1

*Corresponding author. E-mail: xuexinyu@mail.neu.edu.cn (Xinyu Xue)

 

Abstract

 


Toc

We fabricated wearable perspiration analyzing sites for actively monitoring physiological status during exercises without any batteries or other power supply. The device mainly consists of ZnO nanowire (NW) arrays and flexible polydimethylsiloxane (PDMS) substrate. Sweat on the skin can flow into the flow channels of the device through capillary action and flow along the channels to ZnO NWs. The sweat flowing on the NWs (with lactate oxidase modification) can output a DC electrical signal, and the outputting voltage is dependent on the lactate concentration in the sweat as the biosensing signal. ZnO NWs generate electric double layer (EDL) in sweat, which causes a potential difference between the upper and lower ends (hydrovoltaic effect). The product of the enzymatic reaction can adjust the EDL and influence the output. This device can be integrated with wireless transmitter and may have potential application in constructing sports big data. This work promotes the development of next generation of biosensors and expand the scope of self-powered physiological monitoring system.


 

Keywords

Battery-free; Hydrovoltaic effect; Perspiration analyzing; Sports big data; ZnO

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