High‐Performance Sensor Based on Thin‐Film Metallic Glass/Ultra‐nanocrystalline Diamond/ZnO Nanorod Heterostructures for Detection of Hydrogen Gas at Room Temperature

Abstract

This article outlines an ovel materialt oe nablet he detection of hydrogen gas. The material combines thin-film metallic glass (TFMG), ultra-nanocrystalline diamond( UNCD), and ZnO nanorods (ZNRs) andc an be used as ad evice 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 MDZd evice exhibited ap erformance superior to the other configurations, with as ensing response of 34 %u nder very low hydrogen gas concentrations (10ppm) at room temperature. Remarkably, the MDZ-based sensore xhibits an ultra-high sensitivity of 60.5 %u nder 500 ppm H 2 .T he MDZs ensor provedv ery fast in terms of response time (20 s) and recovery time (35 s). In terms of selectivity,t he sensors were particularly suited to hydrogeng as. The sensora chieved 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 chargecarrierd ensity.T his paper also discusses the respective energyb and models of these heterostructures and also the interface effect on the gas sensing enhancements. The results indicatet hat the proposed hybrid TFMG/UNCD/ZNRs nanostructures could be utilized as highperformance hydrogen gas sensors. 2À ).

Advanced development of metal oxide nanomaterials for H2gas sensing applications

“…4 In order to detect H 2 leakage during storage and transportation in time and avoid large-scale social hazards, various H 2 detection devices have been developed. [5][6][7][8][9] Of the achieved so far, the resistive-type gas sensors are the most favored by researchers. 10-12 4 Semiconductor metal oxide (MOx) nanomaterials have extraordinary physicalchemical properties in optical, electric and magnetic performances, [13][14][15] which have been widely used in catalysis, [16][17][18][19][20][21][22] energy storage, 23 biosensors, 24 gas sensors.…”

Review on the Properties of Boron-Doped Diamond and One-Dimensional-Metal-Oxide Based P-N Heterojunction

“…Huang et al [84] proposed a low-temperature annealing process to improve the optical response of the ZnO NRs/nano-diamond film substrate for the UV photodetector. Furthermore, novel ZnO NRs/ultra-nanocrystalline diamond may be used as a high-sensitivity device for hydrogen gas sensing (Figure 12) [85]. They also reported ZnO NTs, with the diamond NWs enhancing UV detection and field emission properties [86].…”

Ultrathin Diamond Nanofilms—Development, Challenges, and Applications

“…[41,254] However, they suffer from low sensitivity and complicated fabrication procedures. Recently, a gas sensor with excellent sensitivity toward hydrogen (10 ppm at RT) and acetone and short response times of 20 s was introduced by Huang et al [255] The sensor is based on the combination of thin-film metallic glass, ultrananocrystalline diamond and ZnO nanorods, and the introduction of structures (higher surface area). The superior sensitivity was suggested to be defect-related adsorption and/or a change in charge carrier density.…”