Moisture-resistant, Stretchable NO Gas Sensors Based on Laser-induced Graphene for Environmental Monitoring and Breath Analysis

Overview

Journal Microsyst Nanoeng

Date 2022 Jul 12

PMID 35818382

Authors

Li Yang

Guanghao Zheng

Yaoqian Cao

Chuizhou Meng

Yuhang Li

Huadong Ji

Xue Chen

Guangyu Niu

Jiayi Yan

Ye Xue

Huanyu Cheng

Affiliations

Soon will be listed here.

Abstract

The accurate, continuous analysis of healthcare-relevant gases such as nitrogen oxides (NO) in a humid environment remains elusive for low-cost, stretchable gas sensing devices. This study presents the design and demonstration of a moisture-resistant, stretchable NO gas sensor based on laser-induced graphene (LIG). Sandwiched between a soft elastomeric substrate and a moisture-resistant semipermeable encapsulant, the LIG sensing and electrode layer is first optimized by tuning laser processing parameters such as power, image density, and defocus distance. The gas sensor, using a needlelike LIG prepared with optimal laser processing parameters, exhibits a large response of 4.18‰ ppm to NO and 6.66‰ ppm to NO, an ultralow detection limit of 8.3 ppb to NO and 4.0 ppb to NO, fast response/recovery, and excellent selectivity. The design of a stretchable serpentine structure in the LIG electrode and strain isolation from the stiff island allows the gas sensor to be stretched by 30%. Combined with a moisture-resistant property against a relative humidity of 90%, the reported gas sensor has further been demonstrated to monitor the personal local environment during different times of the day and analyze human breath samples to classify patients with respiratory diseases from healthy volunteers. Moisture-resistant, stretchable NO gas sensors can expand the capability of wearable devices to detect biomarkers from humans and exposed environments for early disease diagnostics.

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