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ACS Appl Mater Interfaces. 2018 Oct 10;10(40):34485-34493. doi: 10.1021/acsami.8b11254. Epub 2018 Sep 27.

Sprayed, Scalable, Wearable, and Portable NO2 Sensor Array Using Fully Flexible AgNPs-All-Carbon Nanostructures.

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Department of Basic Sciences Foundation , Air Force Engineering University , Xi'an 710051 , China.
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices , Soochow University , Suzhou 215123 , China.
Key Laboratory of Agricultural Information Service Technology of Ministry of Agriculture, Agricultural Information Institute , Chinese Academy of Agricultural Sciences , Beijing 100081 , China.


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 as conductive electrodes and AgNPs-decorated reduced graphene oxide as sensing layers. The sensor presents sensitive response ( Ra/ Rg) of 6.0-20 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 and 13 times as that of the sample based on metal electrodes and the sample without AgNP decoration. The fabrication method demonstrates good scalability and suitability on the planar and nonplanar supports. The devices attached on a lab coat or the 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.


Ag nanoparticles; Flexible sensors; all-carbon; spray coating; wearable electronics


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