Chemical-recognition-driven selectivity of SnO2-nanowire-based gas sensors

Park H, Kim JH, Vivod D, Kim S, Mirzaei A, Zahn D, Park C, Halik M, Kim SS (2021)

Publication Type: Journal article, Original article

Publication year: 2021

Journal

Nano Today Elsevier

URI: https://www.sciencedirect.com/science/article/abs/pii/S1748013221001900

DOI: 10.1016/j.nantod.2021.101265

Abstract

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 = ~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.

Authors with CRIS profile

Hyoungwon Park Professur für Werkstoffwissenschaften (Polymerwerkstoffe) Dustin Vivod Professur für Theoretische Chemie Dirk Zahn Professur für Theoretische Chemie Marcus Halik Professur für Werkstoffwissenschaften (Polymerwerkstoffe)

Involved external institutions

Inha University / 인하대학교(仁荷大學校 KR Korea, Republic of (KR) Korea Institute of Machinery and Materials (KIMM) KR Korea, Republic of (KR) Shiraz University of Technology (SUTech) / دانشگاه صنعتی شیراز IR Iran, Islamic Republic of (IR)

How to cite

APA:

Park, H., Kim, J.-H., Vivod, D., Kim, S., Mirzaei, A., Zahn, D.,... Kim, S.S. (2021). Chemical-recognition-driven selectivity of SnO2-nanowire-based gas sensors. Nano Today. https://doi.org/10.1016/j.nantod.2021.101265

MLA:

Park, Hyoungwon, et al. "Chemical-recognition-driven selectivity of SnO2-nanowire-based gas sensors." Nano Today (2021).

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