dc.contributor.author |
Manjuladevi, V. |
|
dc.date.accessioned |
2024-02-15T07:03:08Z |
|
dc.date.available |
2024-02-15T07:03:08Z |
|
dc.date.issued |
2015-01 |
|
dc.identifier.uri |
https://ieeexplore.ieee.org/abstract/document/6971159 |
|
dc.identifier.uri |
http://dspace.bits-pilani.ac.in:8080/jspui/xmlui/handle/123456789/14274 |
|
dc.description.abstract |
In this paper, sol-gel derived undoped p-type nanotitania thin films particularly aimed to detect low ppm (5-100 ppm) methanol at low temperature (75-150°C) is reported. Anantase TiO 2 thin film was deposited by sol-gel technique and p-type conductivity of the film was confirmed by Hall measurement. Nanocrystalline structure (12-15 nm) of the TiO 2 film was confirmed by X-ray diffraction study and field emission scanning electron microscopy, respectively. Photoluminance spectroscopy and X-ray photoelectron spectroscopy were employed to characterize the defect structure. Methanol sensor study was carried for detecting the concentration range of 5 to 100 ppm in the temperature range of 75 to 150°C. Highly promising sensing performance was observed at an optimum operating temperature of only 100°C with 102% response magnitude (in 100 ppm methanol) and appreciably fast response and recovery time (~18 and ~21 s, respectively). The possible mechanism behind the origin of p-type conductivity has been correlated with the defect distribution model. Detailed sensing mechanism of the p-nano-titania has been explained using Schottky barrier model. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
IEEE |
en_US |
dc.subject |
Physics |
en_US |
dc.subject |
Undoped p-titania |
en_US |
dc.subject |
Methanol sensing |
en_US |
dc.subject |
Low operting temperature |
en_US |
dc.subject |
Defects distribution |
en_US |
dc.subject |
Schottky barrier model |
en_US |
dc.title |
Low Temperature Methanol Sensing by p-Type Nano-titania: Correlation with Defects States and Schottky Barrier Model |
en_US |
dc.type |
Article |
en_US |