P2EM.6 - Selectivity and Sensitivity NO2 Gas Sensors using PbS CQD Ink prepared via Phase-Transfer Exchange
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-2 - Emerging Sensor Technologies
- Author(s)
- B. Zhang, J. Liu, Z. Hu, S. Yang, Z. Chen, H. Liu - School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei (China)
- Pages
- 757 - 758
- DOI
- 10.5162/IMCS2018/P2EM.6
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Colloidal quantum dots (CQDs) are promising building blocks for low cost and high performance gas sensors due to their low temperature solution processability and extremely small size. PbS CQDs showed a good sensitivity and selectivity for gas sensing, however the complexity of the multiple-step CQD-layer-deposition process still influence device consistency. Herein, gas sensors prepared with CQD-ink using a phase transfer exchange (PTE) method are reported. Devices are fabricated by a simple single-step spin coating using CQD ink instead of past layer by layer deposition via solid state ligand exchange. Gas sensors via PTE method shows a good performance with a towards NO2 detection. The PTE device shows a better performance with a 8.2 response towards 10 ppm NO2 with a response and recovery time 3 s and 127 s respectively.