Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing
| Autor: | Yury Vilk, Silvia Vignolini, Thorsten Wagner, Thomas Bein, Alesja Ivanova, Dina Fattakhova-Rohlfing, Johannes Weber, Jörn Schmedt auf der Günne, Askhat N. Jumabekov, Michael Tiemann, Andrej Paul, Bruno Frka-Petesic |
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| Přispěvatelé: | Ivanova, Alesja [0000-0002-4719-9040], Frka-Petesic, Bruno [0000-0001-5002-5685], Jumabekov, Askhat N [0000-0003-0051-9542], Schmedt Auf der Günne, Jörn [0000-0003-2294-796X], Vignolini, Silvia [0000-0003-0664-1418], Fattakhova-Rohlfing, Dina [0000-0003-2008-0151], Bein, Thomas [0000-0001-7248-5906], Apollo - University of Cambridge Repository |
| Rok vydání: | 2020 |
| Předmět: |
gas sensing
porous tin dioxide films Materials science chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Article chemistry.chemical_compound General Materials Science Thin film Porosity cellulose nanocrystals Tin dioxide business.industry 021001 nanoscience & nanotechnology 0104 chemical sciences biotemplating Semiconductor Nanocrystal chemistry Chemical engineering 0210 nano-technology Tin business Biosensor Carbon monoxide |
| Zdroj: | ACS Applied Materials & Interfaces ACS Appl Mater Interfaces |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b11891 |
| Popis: | 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 (A (BET) = 46 – 64 m(2) 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 SnO(2)-based CO sensors. This is attributed to the high gas accessibility of the very thin porous film. |
| Databáze: | OpenAIRE |
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