Gas Sensor based on TiO2 Colloidal film with PbS Quantum dots
Kai-wei Chang1*, Wei-shiun Yau1, Chiu-Hsien Wu1
1Institute of NanoScience, National Chung Hsing University, Taichung, Taiwan
* presenting author:張凱為,
TiO2 collidal film with PbS Quantum dots were produced by successive ionic layer adsorption and reaction method.The colloidal quantum dot (CQD) films were annealed at different tempeatures and different gases.The resistances of the films were analyzed.The response of CQD gas sensor was under continuous UV-LED irradiation and standard room temperature condition. We used an Atomic Force Microscopes(AFM) to observe the surface morphology of thin films ,and scanning electron microscope(SEM) was used to analysis the difference of surface before and after annealing. In this study, we focued on the characteristics of CQD films and a photoactivated O3 sensor that operates under normal conditions.

1.Huan Liu, Min Li, Oleksandr Voznyy, Long Hu, Qiuyun Fu,, Dongxiang Zhou, Zhe Xia,Edward H. Sargent andJiang Tang, Physically Flexible, Rapid-Response Gas Sensor Based on Colloidal Quantum Dot Solids, Advanced Materials Volume 26, Issue 17, pages 2718–2724, May 7, 2014

Keywords: gas sensor, quantum dot