title: Supramolecular fabrication of multilevel graphene-based gas sensors with high NO2 sensibility.
abstract: This study reports the supramolecular assembly of a silver nanoparticle-naphthalene-1-sulphonic acid-reduced graphene oxide composite (Ag-NA-rGO) and its utilization to fabricate a highly sensitive and selective gas sensor. The prepared supramolecular assembly acted not only as a non-covalent functionalization platform (π-π interaction) but was also an excellent scaffold to fabricate a highly sensitive and selective low concentration NO2 gas sensor. The prepared composites were characterized using several techniques, which revealed that the graphene sheets were dispersed as ultrathin monolayers with a uniform distribution of silver nanoparticles. The fabricated multilevel structure exhibited an excellent sensing performance, i.e. 2.8 times better, towards 10 ppm NO2 compared to the NA-rGO and rGO based sensors. Apart from its high sensitivity, superior reversibility and selectivity, the prepared supramolecular assembly exhibited an outstanding linear response over the large concentration range from 1 ppm to 10 ppm. The obtained results demonstrate that the prepared supramolecular assembly holds great potential in the fabrication of efficient and effective low-concentration NO2 gas sensors for practical applications.
authors.affiliation: Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, P R China. yao@buaa.edu.cn.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Chen
authors.forename: Ahmad
authors.initials: A
authors.lastname: Umar
authors.forename: Shiwei
authors.initials: S
authors.lastname: Wang
authors.forename: Yao
authors.initials: Y
authors.lastname: Wang
authors.forename: Tong
authors.initials: T
authors.lastname: Tian
authors.forename: Ying
authors.initials: Y
authors.lastname: Shang
authors.forename: Yuzun
authors.initials: Y
authors.lastname: Fan
authors.forename: Qi
authors.initials: Q
authors.lastname: Qi
authors.forename: Dongmei
authors.initials: D
authors.lastname: Xu
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang