Colorimetric gas detection by the varying thickness of a thin film of ultrasmall PTSA-coated TiO2 nanoparticles on a Si substrate
| Autor: | Vambola Kisand, Aile Tamm, Mikk Antsov, Kathriin Utt, Meeri Visnapuu, Andris Šutka, Ergo Nõmmiste, Meeri Lembinen, Krisjanis Smits, Urmas Joost |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Silicon Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Substrate (electronics) engineering.material 010402 general chemistry lcsh:Chemical technology 01 natural sciences lcsh:Technology Coating NATURAL SCIENCES:Physics [Research Subject Categories] General Materials Science lcsh:TP1-1185 Electrical and Electronic Engineering Thin film Absorption (electromagnetic radiation) lcsh:Science Optical path length business.industry lcsh:T p-toluenesulfonic acid (PTSA) 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences chemistry engineering Optoelectronics lcsh:Q Naked eye 0210 nano-technology business Refractive index TiO2 nanoparticles colorimetric gas sensing lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 229-236 (2017) Beilstein Journal of Nanotechnology |
| ISSN: | 2190-4286 |
| Popis: | Financial support from the Estonian Research Council (IUT2-25, PUT170, PUT1096, PUT748, PUTJD680), the Estonian Centre of Excellence in Research Projects “Advanced materials and high-technology devices for sustainable energetics, sensorics and nanoelectronics” TK141 (2014-2020.4.01.15-0011), “Emerging orders in quantum and nanomaterials” TK134 and the Development Fund of the University of Tartu, are all gratefully acknowledged. Colorimetric gas sensing is demonstrated by thin films based on ultrasmall TiO2 nanoparticles (NPs) on Si substrates. The NPs are bound into the film by p-toluenesulfonic acid (PTSA) and the film is made to absorb volatile organic compounds (VOCs). Since the color of the sensing element depends on the interference of reflected light from the surface of the film and from the film/silicon substrate interface, colorimetric detection is possible by the varying thickness of the NP-based film. Indeed, VOC absorption causes significant swelling of the film. Thus, the optical path length is increased, interference wavelengths are shifted and the refractive index of the film is decreased. This causes a change of color of the sensor element visible by the naked eye. The color response is rapid and changes reversibly within seconds of exposure. The sensing element is extremely simple and cheap, and can be fabricated by common coating processes. Eesti Teadusagentuur PUT748,IUT2-25,PUT170,PUT1096,PUTJD680; Estonian Centre of Excellence in Research Projects 2014-2020.4.01.15-0011,TK134,TK141; University of Tartu; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART² |
| Databáze: | OpenAIRE |
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