Issue 22, 2023

Exploring 2D hexagonal WO3/COK-12 nanostructures for efficient humidity detection

Abstract

This research reports a pioneering approach to humidity sensing by leveraging the unique properties of 2D hexagonal mesoporous COK-12 (Centrum voor Oppervlaktechemie & Katalyse-12/Center for Surface Chemistry & Catalysis – 12). In this research, the utilization of these innovative COK-12 structures showcases their potential for advancing humidity-sensing technology, marking a significant stride in the field of surface chemistry and catalysis. We investigated how electrical resistance changes in (x-WO3)/COK-12 (with x = 0%, 1%, 3%, 6%, and 9%) with varying humidity levels. The samples containing diverse tungsten concentrations in COK-12 were synthesized by a hydrothermal method and characterized using appropriate tools. The results demonstrate the successful integration of tungsten ions into COK-12, maintaining its distinctive hexagonal mesoporous structure and high specific surface area (864 m2 g−1). Tungsten-doped COK-12 humidity sensors exhibit great sensitivity and response speed due to modified conductivity under humid conditions, enhancing moisture measurement precision. Notably, the 6%-WO3/COK-12 sensor exhibits a linear correlation between relative humidity and electrical resistance, signifying strong sensitivity. The sensor displays a significant 4.3 orders of magnitude resistance shift, with rapid 12 s response and 11 s recovery times. These findings enhance our understanding of COK-12's humidity sensing capabilities, opening avenues for diverse applications like environmental monitoring, weather forecasting, and industrial processes including catalysis, adsorption, and drug delivery.

Graphical abstract: Exploring 2D hexagonal WO3/COK-12 nanostructures for efficient humidity detection

Article information

Article type
Paper
Submitted
10 Sep 2023
Accepted
23 Oct 2023
First published
24 Oct 2023
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2023,4, 5785-5796

Exploring 2D hexagonal WO3/COK-12 nanostructures for efficient humidity detection

B. Rohilla, A. Boora, M. S. Goyat and S. Duhan, Mater. Adv., 2023, 4, 5785 DOI: 10.1039/D3MA00691C

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