Journal
NANO TODAY
Volume 40, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2021.101265
Keywords
Self-assembled monolayer; SnO2 nanowire; Gas sensor; Selectivity; Surface chemistry; MD simulation
Ask authors/readers for more resources
This study enhanced the sensing capabilities of semiconducting metal oxide-based gas sensors through a new post-modification method, improving gas selectivity; the chemical-affinity-driven interaction between SAM and gas molecules enabled selective gas sensing.
The sensing capabilities of semiconducting metal oxide (SMO)-based gas sensors, which are a promising type of sensors, were improved in the present study using a novel method that enhanced gas selectivity toward various gas molecules. A simple and effective post-modification with functional self-assembled monolayer (SAM) molecules enhanced the selective sensing properties. The chemical-affinity-driven interaction between SAM and gas molecules enabled selective gas sensing, and the small size of SnO2 nanowires (NWs; diameter = similar to 50 nm) provided a large sensing area. Moreover, simple alteration of the chemical moiety in SAM molecules facilitated the tuning of SAM-induced selectivity over a broad range of collections. The binding of SAMs on the NWs was analyzed by infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy, with the selective gas sensing being investigated under various sensing conditions. The results from the molecular dynamics simulations supported the proposed selective sensing mechanism. The combination of passivation and selective gas sensing resulted in a simple method for the selective gas sensing of SnO2 NWs, and the concept could be generally expanded to other types of SMO-based sensing platforms. (c) 2021 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available