Wearable Battery-Free Perspiration Analyzing Sites Based on Sweat Flowing on ZnO Nanoarrays
Open Access
- 2 May 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nano-Micro Letters
- Vol. 12 (1), 1-11
- https://doi.org/10.1007/s40820-020-00441-1
Abstract
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 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 expands the scope of self-powered physiological monitoring system.This publication has 62 references indexed in Scilit:
- Transverse piezoelectric field-effect transistor based on single ZnO nanobeltsPhysical Chemistry Chemical Physics, 2010
- Raman spectra and photoluminescence properties of In-doped ZnO nanostructuresMaterials Letters, 2010
- Piezotronic strain sensor based on single bridged ZnO wiresPhysica Status Solidi (RRL) – Rapid Research Letters, 2009
- High‐Density Carrier Accumulation in ZnO Field‐Effect Transistors Gated by Electric Double Layers of Ionic LiquidsAdvanced Functional Materials, 2009
- High-performance piezoelectric gate diode of a single polar-surface dominated ZnO nanobeltNanotechnology, 2009
- Cellular Level Biocompatibility and Biosafety of ZnO NanowiresThe Journal of Physical Chemistry C, 2008
- Double-Layer in Ionic Liquids: Paradigm Change?The Journal of Physical Chemistry B, 2007
- Heat Illness in AthletesSports Medicine, 2004
- ZnO Nanobridges and NanonailsNano Letters, 2002
- Whole-body pre-cooling and heat storage during self-paced cycling performance in warm humid conditionsJournal of Sports Sciences, 1999