High‐Performance Sensor Based on Thin‐Film Metallic Glass/Ultra‐nanocrystalline Diamond/ZnO Nanorod Heterostructures for Detection of Hydrogen Gas at Room Temperature. Issue 44 (8th July 2019)

• Record Type: Journal Article
• Authors: Huang, Bohr‐Ran; Chu, Jinn P.; Saravanan, Adhimoorthy; Yenesew, Markos M.; Bönninghoff, Niklas; Chang, Chia‐Hao
• Is Part Of: Chemistry. Volume 25:Issue 44(2019)
• Page Start: 10385
• Page End: 10393
• Publication Date: 2019-07-08
• Subjects: hydrogen sensors -- materials science -- metallic glass interface -- nanohybrids -- ZnO–thin-film metallic glass (TFMG); Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201901180
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: This article outlines a novel material to enable the detection of hydrogen gas. The material combines thin‐film metallic glass (TFMG), ultra‐nanocrystalline diamond (UNCD), and ZnO nanorods (ZNRs) and can be used as a device for effective hydrogen gas sensing. Three sensors were fabricated by using combinations of pure ZNRs (Z), UNCD/ZNRs (DZ), and TFMG/UNCD/ZNRs (MDZ). The MDZ device exhibited a performance superior to the other configurations, with a sensing response of 34 % under very low hydrogen gas concentrations (10 ppm) at room temperature. Remarkably, the MDZ‐based sensor exhibits an ultra‐high sensitivity of 60.5 % under 500 ppm H2 . The MDZ sensor proved very fast in terms of response time (20 s) and recovery time (35 s). In terms of selectivity, the sensors were particularly suited to hydrogen gas. The sensor achieved the same response performance even after two months, thereby demonstrating the superior stability. It is postulated that the superior performance of MDZ can be attributed to defect‐related adsorption as well as charge carrier density. This paper also discusses the respective energy band models of these heterostructures and also the interface effect on the gas sensing enhancements. The results indicate that the proposed hybrid TFMG/UNCD/ZNRs nanostructures could be utilized as high‐performance hydrogen gas sensors. Abstract : Diamonds on the soles of her sensors : High‐performance hybrid hydrogen gas sensors are fabricated by combining thin‐film metallic glass (TFMG), ultra‐nanocrystalline diamond (UNCD), and ZnO nanorods (ZNRs). The hybrid device exhibits superior performance to the other ZnO hybrid configurations. Remarkably, the TFMG/UNCD/ZNRs based sensor exhibits the ultra‐high sensitivity of 60.5 % under 500 ppm H2 concentrations.