High-energy {001} crystal facets and surface fluorination engineered gas sensing properties of anatase titania nanocrystals
Applied Surface Science, ISSN: 0169-4332, Vol: 423, Page: 602-610
2017
- 39Citations
- 12Captures
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Article Description
Controllable crystal facets exposing is an efficient approach for enhancing gas sensing performances of semiconductor nanomaterials. In order to study the crystal-facets-dependent gas-sensing properties of TiO 2 systematically and exactly, a series of anatase TiO 2 nanocrystals with different percentage of high-energy {001} crystal facets exposure (from 6% to 91%) were designed and synthesized by a simple hydrofluoric acid-assisted hydrothermal method. Gas sensing tests suggested that gas response of the TiO 2 nanocrystals increased with the percentage of high-energy {001} crystal facets, although the specific surface areas gradually decreased. The results unquestionably confirmed the enhanced gas sensing activity of anatase TiO 2 high-energy {001} crystal facets. Moreover, it was found that surface fluorination of high-energy {001} crystal facets played a negative role on the gas sensing activity. The relevant sensing mechanism was discussed in detail based on combination of experimental characterization and first-principle calculations, which showed that gas adsorption properties made a great contribution to gas sensing performance. By providing a comprehensive understanding of the crystal-facets-dependent gas-sensing properties of TiO 2, the present work will be helpful for the designing of TiO 2 -based gas-sensing materials.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0169433217318639; http://dx.doi.org/10.1016/j.apsusc.2017.06.208; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85021684598&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0169433217318639; https://dx.doi.org/10.1016/j.apsusc.2017.06.208
Elsevier BV
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