Journal
NANOTECHNOLOGY
Volume 32, Issue 21, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/abe6c9
Keywords
reduced graphene oxide; chemiresistor sensor; QCM; gas sensor; multi-walled carbon nanotube
Funding
- NATO [G5244]
- Basque Government [GV IT999-16]
- Freistaat Sachsen from German research found [G293]
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A novel dry method based on air sonication process was used to prepare graphene and multi-walled carbon nanotubes hybrids, avoiding the use of solvents and multistep purification process. By changing the ratio between MWCNTs and G, a range of hybrids with different surface morphologies and chemistries were obtained, showing great potential for designing mass-based sensors for toxic gases and chemiresistors for vapor detection.
The combination of graphene (G) and multi-walled carbon nanotubes (MWCNTs) creates three-dimensional hybrid structures particularly suitable as next-generation electrical interface materials. Nevertheless, efficient mixing of the nanopowders is challenging, unless previous disaggregation and eventual surface modification of both is reached. To avoid use of solvents and multistep purification process for synthesis of stable G/MWCNTs hybrids, herein, a novel dry method based on an air sonication process was used. Taking advantage from the vigorous turbulent currents generated by powerful ultrasonication in air that induces strong thermal convection or radiation to and from the particles, it simultaneously ensures disentanglement of the large MWCNT bundles and G exfoliation and their only mild surface modifications. By changing the ratio between MWCNTs and G, a range of hybrids was obtained, different in surface morphology and chemistry. These hybrids have shown great potential as sensing material for designing mass-based sensors for toxic gases and chemiresistor for vapors detection.
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