Sprayed, Scalable, Wearable, and Portable NO 2 Sensor Array Using Fully Flexible AgNPs-All-Carbon Nanostructures.
ACS applied materials & interfaces(2018)
摘要
Flexible chemical sensors usually require transfer of prepared layers or whole device onto special flexible substrates and further attachment to target objects, limiting the practical applications. Herein, a sprayed gas sensor array utilizing silver nanoparticles (AgNPs)-all-carbon hybrid nanostructures is introduced to enable direct device preparation on various target objects. The fully flexible device is formed using metallic single-walled carbon nanotubes (m-SWCNT) as conductive electrodes and AgNPs decorated reduced graphene oxide (rGO) as sensing layers. The sensor presents sensitive response (Ra/Rg) of 6.0 to 20 ppm NO2, great mechanical robustness (3000 bending cycles) and obvious sensing ability as low as 0.2 ppm NO2 at room temperature. The sensitivity is about 3.3 times and 13 times as that of the sample based on metal electrodes and the sample without AgNPs decoration. The fabrication method demonstrates good scalability and suitability on the planar and non-planar supports. The devices attached on lab coat or human body perform stable performance, indicating practicability in wearable and portable fields. The flexible and scalable sensor provides a new choice for real-time monitoring of toxic gases in personal mobile electronics and human-machine interactions.
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关键词
Flexible sensors,wearable electronics,spray coating,Ag nanoparticles,all-carbon
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