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Rice-like Tellurium Thin Films Deposited by a Galvanic Displacement Reaction and Ultra-high Sensing Response to Hydrogen Sulfide (H2S) Gas at Room temperature

Title
Rice-like Tellurium Thin Films Deposited by a Galvanic Displacement Reaction and Ultra-high Sensing Response to Hydrogen Sulfide (H2S) Gas at Room temperature
Author
좌용호
Keywords
Hydrogen sulfide; Gas sensor; Tellurium; Room temperature
Issue Date
2019-03
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 282, Page. 756-764
Abstract
In this study, we present the synthesis of rice-like tellurium (Te) thin films using a galvanic displacement reaction (GDR, a substrate.sacrificial, electro-less deposition technique) on a silicon wafer and their response to hydrogen sulfide (H2S) gas at room temperature. The thin films were composed of rice-like Te nano grains, whose thickness and crystallinity were controlled by adjusting the reaction time of the GDR. As the reaction time increased, the as-fabricated rice-like Te-based gas sensors showed full response and recovery. The sensors with an optimized GDR showed ultra-high sensing response to H2S (1000% at 100 ppm of H2S) under ambient sensing conditions, with excellent response toward H2S gas (ranging from 15 ppb to 90 ppm). Additionally, the optimized sensor shows relatively high response toward H2S gas as compared to other gases such as NO2, NH3, and CO. Together, these results indicate that the rice-like tellurium (Te) thin films have great potential for applications in high-performance (HS)-S-2 gas sensors that are capable of operating at room temperature.
URI
https://www.sciencedirect.com/science/article/pii/S0925400518320331https://repository.hanyang.ac.kr/handle/20.500.11754/112587
ISSN
0925-4005
DOI
10.1016/j.snb.2018.11.075
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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