Effect of core and surface area toward hydrogen gas sensing performance using Pd@ZnO core-shell nanoparticles
- Authors
- Nguyen, Thuy T. D.; Van Dao, Dung; Kim, Dong-Seog; Lee, Hu-Jun; Oh, Sang-Yeob; Lee, In-Hwan; Yu, Yeon-Tae
- Issue Date
- 4월-2021
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Palladium; Zinc oxide; Core-shell; Hydrogen sensing; Surface area
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.587, pp.252 - 259
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF COLLOID AND INTERFACE SCIENCE
- Volume
- 587
- Start Page
- 252
- End Page
- 259
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128365
- DOI
- 10.1016/j.jcis.2020.12.017
- ISSN
- 0021-9797
- Abstract
- A versatile hydrogen gas sensor is fabricated using Pd@ZnO core-shell nanoparticles (CSNPs), which were synthesized through a hydrothermal route. Effect of oxidation behavior of Pd core to hydrogen sensing is also investigated for Pd@ZnO CSNPs. Accordingly, Pd@ZnO-2 sensor (core-shell sample was calcined in argon) demonstrates the best performance with respect to Pd@ZnO-1 (core-shell sample was calcined in air) and pure ZnO. It shows a much higher response (R = R-a/R-g = 22) than those of Pd@ZnO-1 (12) and pure ZnO (7) sensors with faster response and recovery times (1.4 and 7.8 min) to 100 ppm hydrogen at 350 degrees C. In addition, Pd@ZnO-2 sensor owns high selectivity to hydrogen among interfering target gases. Improvement can be attributed to the high content of metallic Pd-0 species in CSNPs as calcined in argon. Thereby, a higher Pd metallic content (77%) still remains in Pd@ZnO-2 compared to Pd@ZnO-1 (56%), which in turn modulates the resistance of sensors as exposed to air and target gas, thus enhancing gas sensing activity. High BET surface area of core-shell materials provides plenty of active sites for accelerating the sensing reactions as well. (c) 2020 Elsevier Inc. All rights reserved.
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