Synergistic Integration of Chemo-Resistive and SERS Sensing for Label-Free Multiplex Gas Detection

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Practical sensing applications such as real-time safety alerts and clinical diagnoses require sensor devices to differentiate between various target molecules with high sensitivity and selectivity, yet conventional devices such as oxide-based chemo-resistive sensors and metal-based surface-enhanced Raman spectroscopy (SERS) sensors usually do not satisfy such requirements. Here, a label-free, chemo-resistive/SERS multimodal sensor based on a systematically assembled 3D cross-point multifunctional nanoarchitecture (3D-CMA), which has unusually strong enhancements in both "chemo-resistive" and "SERS" sensing characteristics is introduced. 3D-CMA combines several sensing mechanisms and sensing elements via 3D integration of semiconducting SnO2 nanowire frameworks and dual-functioning Au metallic nanoparticles. It is shown that the multimodal sensor can successfully estimate mixed-gas compositions selectively and quantitatively at the sub-100 ppm level, even for mixtures of gaseous aromatic compounds (nitrobenzene and toluene) with very similar molecular structures. This is enabled by combined chemo-resistive and SERS multimodal sensing providing complementary information.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2021-11
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS, v.33, no.44, pp.2105199

ISSN
0935-9648
DOI
10.1002/adma.202105199
URI
http://hdl.handle.net/10203/289158
Appears in Collection
MS-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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