Eur. Phys. J. Appl. Phys.
Volume 90, Number 3, June 2020
Disordered Semiconductors: Physics and Applications
|Number of page(s)||9|
|Section||Semiconductors and Devices|
|Published online||07 July 2020|
A study of the effect of morphology on the optical and electrical properties of TiO2 nanotubes for gas sensing applications★
National Institute for Astrophysics, Optics and Electronics (INAOE), Electronics, Tonantzintla, Puebla, Mexico
Received in final form: 15 April 2020
Accepted: 27 May 2020
Published online: 7 July 2020
In this paper, we report the results of the optical and electrical properties of TiO2 nanotubes with different morphologies for gas sensing applications. Four nanomaterials of TiO2 were prepared by electrochemical anodization using four different electrolyte solutions: 0.255 wt% NH4F with 1 wt%, 3 wt%, 6 wt% and 9 wt% of deionized water in ethylene glycol. Micrographs by scanning electron microscopy (SEM) showed different morphologies caused by the variation in the water content of the solutions. Consequently, as an effect of morphology, the photoluminescence intensity in the visible spectrum was modified. By a change of the crystalline phase of TiO2 nanotubes, the oxygen vacancies increased and affected to the optical and electrical properties of TiO2 films. These films were used for detecting gas at room temperature. Hence, we studied and analyzed the relationship of the morphology, elemental composition, phase composition, band gap energy and defect states as a function of the electrical resistance change of TiO2 nanotubes to understand and improve the sensor response.
© EDP Sciences, 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.