Hydrogen Sensors Based on Flexible Carbon Nanotube-Palladium Composite Sheets Integrated with Ripstop Fabric.

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ID: 85338
2020
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Abstract
This work describes the design and fabrication of free-standing carbon nanotube-palladium (CNT-Pd) composite sheets for hydrogen gas sensing. The CNT-Pd composites were made by electroplating palladium onto a solvent-densified and oxygen plasma-treated CNT sheet. The latter was prepared using high purity CNTs drawn from a dense, vertically aligned array grown by chemical vapor deposition on silicon substrates. The CNT-Pd sheets were characterized by energy-dispersive spectroscopy, scanning electron microscopy, and X-ray diffraction. The amount of palladium in the composite was 16.5 wt % as measured via thermogravimetric analysis. Thin strips of the CNT-Pd sheets were assembled as chemiresistor sensors and tested for hydrogen gas detection. The sensors demonstrated a limit of detection of 0.1 mol % and displayed signal reversibility without the need for oxygen removal or heat treatment. A decrease in signal reversibility was observed after multiple exposure cycles; however, redensification with ethanol significantly restored the original reversibility. The sensor showed the Freundlich adsorption isotherm behavior when exposed to hydrogen. The material's potential application toward a wearable, flexible sensor was demonstrated by integrating the chemiresistor onto a fabric material using hot-press processing and testing the composite for hydrogen sensitivity.
Reference Key
mcconnell2020hydrogenacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors McConnell, Colin;Kanakaraj, Sathya Narayan;Dugre, Joshua;Malik, Rachit;Zhang, Guangqi;Haase, Mark R;Hsieh, Yu-Yun;Fang, Yanbo;Mast, David;Shanov, Vesselin;
Journal ACS omega
Year 2020
DOI
10.1021/acsomega.9b03023
URL
Keywords
anti-inflammatory activity ethanol enterococcus faecalis ef-2001 mapk/nf-κb pathway acute gastric ulcer

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