Thermodynamic sensing mechanisms of AlGaN-based metal/reactive insulator/semiconductor-type hydrogen sensors

研究成果: Article

2 引文 斯高帕斯(Scopus)

摘要

Thermodynamic sensing mechanisms of Pt/reactive insulator/AlGaN hydrogen sensors were studied. The reactive insulator layer of mixed Ga 2O 3 and Al 2O 3 was grown directly from the AlGaN layer using a photoelectrochemical oxidation method. The current of the hydrogen sensors exhibited considerable response under forward bias in a hydrogen ambient at the temperature range between 350 K and 550 K. Based on the steady-state analysis, the adsorption enthalpy of -11.64kJ/mol for hydrogen adsorbed at the interface and in the reactive insulator layer was obtained. Because the kinetic reaction was an exothermic action, the hydrogen response decreased with an increase of operating temperatures. From the thermodynamic kinetic analysis of transient responses, the activation energy was 3.57 kJ/mol. The Pt/reactive insulator/AlGaN hydrogen sensors exhibited high performance at various temperatures.

原文English
文章編號6059470
頁(從 - 到)1450-1454
頁數5
期刊IEEE Sensors Journal
12
發行號5
DOIs
出版狀態Published - 2012 四月 24

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering

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