Oluwasanya Pelumi W, Carey Tian, Samad Yarjan Abdul, Occhipinti Luigi G
Cambridge Graphene Centre, Department of Engineering, University of Cambridge, Cambridge, UK.
CRANN and AMBER Research Centres, Trinity College Dublin, Dublin, Ireland.
Sci Rep. 2022 Jul 19;12(1):12288. doi: 10.1038/s41598-022-16617-1.
Materials adopted in electronic gas sensors, such as chemiresistive-based NO sensors, for integration in clothing fail to survive standard wash cycles due to the combined effect of aggressive chemicals in washing liquids and mechanical abrasion. Device failure can be mitigated by using encapsulation materials, which, however, reduces the sensor performance in terms of sensitivity, selectivity, and therefore utility. A highly sensitive NO electronic textile (e-textile) sensor was fabricated on Nylon fabric, which is resistant to standard washing cycles, by coating Graphene Oxide (GO), and GO/Molybdenum disulfide (GO/MoS) and carrying out in situ reduction of the GO to Reduced Graphene Oxide (RGO). The GO/MoS e-textile was selective to NO and showed sensitivity to 20 ppb NO in dry air (0.05%/ppb) and 100 ppb NO in humid air (60% RH) with a limit of detection (LOD) of ~ 7.3 ppb. The selectivity and low LOD is achieved with the sensor operating at ambient temperatures (~ 20 °C). The sensor maintained its functionality after undergoing 100 cycles of standardised washing with no encapsulation. The relationship between temperature, humidity and sensor response was investigated. The e-textile sensor was embedded with a microcontroller system, enabling wireless transmission of the measurement data to a mobile phone. These results show the potential for integrating air quality sensors on washable clothing for high spatial resolution (< 25 cm)-on-body personal exposure monitoring.
用于集成在衣物中的电子气体传感器所采用的材料，如基于化学电阻的一氧化氮（NO）传感器，由于洗涤液中腐蚀性化学物质和机械磨损的综合作用，无法承受标准洗涤周期。使用封装材料可以减轻器件故障，然而，这会在灵敏度、选择性以及实用性方面降低传感器性能。通过在耐标准洗涤周期的尼龙织物上涂覆氧化石墨烯（GO）、氧化石墨烯/二硫化钼（GO/MoS）并将GO原位还原为还原氧化石墨烯（RGO），制备了一种高灵敏度的NO电子织物（e-织物）传感器。GO/MoS电子织物对NO具有选择性，在干燥空气中（0.05%/ppb）对20 ppb NO以及在潮湿空气中（60%相对湿度）对100 ppb NO表现出灵敏度，检测限（LOD）约为7.3 ppb。该传感器在环境温度（约20°C）下运行时实现了选择性和低检测限。在未经封装的情况下经过100次标准化洗涤循环后，该传感器仍保持其功能。研究了温度、湿度与传感器响应之间的关系。该电子织物传感器嵌入了一个微控制器系统，能够将测量数据无线传输到手机。这些结果表明，在可洗涤衣物上集成空气质量传感器用于高空间分辨率（<25厘米）的人体个人暴露监测具有潜力。
