Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing.
ACS applied materials & interfaces
American Chemical Society (ACS)
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Ivanova, A., Ivanova, A., Frka-Petesic, B., Paul, A., Wagner, T., Jumabekov, A. N., Vilk, Y., et al. (2020). Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing.. ACS applied materials & interfaces, 12 (11), 12639-12647. https://doi.org/10.1021/acsami.9b11891
Porous tin dioxide is an important low-cost semiconductor applied in electronics, gas sensors and biosensors. Here we present a versatile template-assisted synthesis of nanostructured tin dioxide thin films using cellulose nanocrystals (CNCs). We demonstrate that structural features of CNC-templated tin dioxide films strongly depend on the precursor composition. The precursor properties were studied by using low-temperature nuclear magnetic resonance spectroscopy of tin tetrachloride in solution. We demonstrate that it is possible to optimize the precursor conditions to obtain homogeneous precursor mixtures and therefore highly porous thin films with pore dimensions in the range of 10 - 20 nm (ABET = 46 - 64 m2 g-1, measured on powder). Finally, by exploiting the high surface area of the material we developed a resistive gas sensor based on CNC-templated tin dioxide. The sensor shows high sensitivity to carbon monoxide (CO) in ppm concentrations and low cross-sensitivity to humidity. Most importantly, the sensing kinetics is remarkably fast; both the response to the analyte gas and the signal decay after gas exposure occur within few seconds, faster than in standard SnO2-based CO sensors. This is attributed to the high gas accessibility of the very thin porous film.
ECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (639088)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (743543)
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External DOI: https://doi.org/10.1021/acsami.9b11891
This record's URL: https://www.repository.cam.ac.uk/handle/1810/300925
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