Optical gas sensing properties of nanoporous Nb2O5 films

Ab Kadir, Rosmalini, Rani, Rozina Abdul, Alsaif, Manal M.Y.A., Ou, Jian Zhen, Wlodarski, Wojtek, O'Mullane, Anthony P., & Kalantar-zadeh, Kourosh (2015) Optical gas sensing properties of nanoporous Nb2O5 films. ACS Applied Materials & Interfaces, 7(8), pp. 4751-4758.

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Nanoporous Nb2O5 has been previously demonstrated to be a viable electrochromic material with strong intercalation characteristics. Despite showing such promising properties, its potential for optical gas sensing applications, which involves the production of ionic species such as H+, has yet to be explored. Nanoporous Nb2O5 can accommodate a large amount of H+ ions in a process that results in an energy bandgap change of the material which induces an optical response. Here, we demonstrate the optical hydrogen gas (H2) sensing capability of nanoporous anodic Nb2O5 with a large surface-to-volume ratio prepared via a high temperature anodization method. The large active surface area of the film provides enhanced pathways for efficient hydrogen adsorption and dissociation, which are facilitated by a thin layer of Pt catalyst. We show that the process of H2 sensing causes optical modulations that are investigated in terms of response magnitudes and dynamics. The optical modulations induced by the intercalation process and sensing properties of nanoporous anodic Nb2O5 shown in this work can potentially be used for future optical gas sensing systems.

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ID Code: 82329
Item Type: Journal Article
Refereed: Yes
Keywords: Niobium oxide, anodization, nanoporous, optical response, gas sensing
DOI: 10.1021/am508463g
ISSN: 1944-8252
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 American Chemical Society
Deposited On: 09 Mar 2015 22:45
Last Modified: 22 Oct 2016 13:39

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