title: Fully printed, rapid-response sensors based on chemically modified graphene for detecting NO2 at room temperature.
abstract: Reduced graphene oxide (RGO) has proven to be effective in trace gas detection at room temperature ambient conditions. However, the slow response-recovery characteristic is a major hurdle for the RGO-based gas sensors. Herein, we report a gravure-printed chemoresistor-type NO2 sensor based on sulfonated RGO (S-RGO) decorated with Ag nanoparticles (Ag-S-RGO). Large amounts of silver nanoparticles with an average particle size of 10-20 nm were uniformly assembled on flat S-RGO surfaces. The printed Ag-S-RGO sensor possesses a high sensitivity and fast response-recovery characteristic over NO2 concentrations ranging from 0.5 to 50 ppm. Upon exposure to 50 ppm NO2 at room temperature, the Ag-S-RGO sensor shows a sensitivity of 74.6%, a response time of 12 s and a recovery time of 20 s. In addition, the Ag-S-RGO sensors exhibit satisfactory flexibility with an almost constant resistance after 1000 bending cycles. The printed and high-performance Ag-S-RGO sensors described here will be a good prospect in environmental monitoring of NO2.
authors.affiliation: Joint Lab with Wuhu Token for Graphene Electrical Materials and Application, Department of Physics, Shanghai Normal University , Guilin Road 100, Shanghai 200234, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Huang
authors.forename: Zhenping
authors.initials: Z
authors.lastname: Wang
authors.forename: Jiankun
authors.initials: J
authors.lastname: Zhang
authors.forename: Jianlong
authors.initials: J
authors.lastname: Pu
authors.forename: Youjie
authors.initials: Y
authors.lastname: Lin
authors.forename: Shuhua
authors.initials: S
authors.lastname: Xu
authors.forename: Leo
authors.initials: L
authors.lastname: Shen
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.forename: Wangzhou
authors.initials: W
authors.lastname: Shi