Photoactivated solid-state gas sensor for carbon dioxide detection at room temperature

A photoactivated room temperature BaTiO 3–CuO thin film for carbon dioxide detection is presented. The response time to carbon dioxide is around 2 min and the sensitivity shows a logarithmic relation between 500 and 5000 ppm of CO 2. The electrical changes are related to the physical behavior of the...

Full description

Saved in:
Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2010-08, Vol.149 (2), p.368-372
Main Authors: Herrán, J., Fernández-González, O., Castro-Hurtado, I., Romero, T., Gª Mandayo, G., Castaño, E.
Format: Article
Language:English
Subjects:
Actuators
Barium titanates
BaTiO 3–CuO
Carbon dioxide
CO 2
Detection
Gas sensor
Heterojunctions
Migration
Photoactivation
Photochemical
Room temperature
Stimulation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A photoactivated room temperature BaTiO 3–CuO thin film for carbon dioxide detection is presented. The response time to carbon dioxide is around 2 min and the sensitivity shows a logarithmic relation between 500 and 5000 ppm of CO 2. The electrical changes are related to the physical behavior of the photoactivated material according to the p–n heterojunction formed between the BaTiO 3 and the CuO. The chemical reaction that allows the sensing process is based on the interaction of the CO 2 and the hydroxyl group's (OH −) adsorbed on the p–n heterojunction. The impedance variations measured are related to the charge migration from the surface to the bulk of the material. The photochemical stimulation allows the possibility of sensing at room temperature (25 ± 1 °C).
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2010.06.050