کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
740037 1462097 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Novel optical hydrogen sensors based on 3C-SiC membrane and photovoltaic detector
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Novel optical hydrogen sensors based on 3C-SiC membrane and photovoltaic detector
چکیده انگلیسی


• Hydrogen sensor based on 3C-SiC membrane.
• Photovoltaic output signal of 3C-SiC/Si was used for hydrogen sensing.
• Hydrogen sensing properties are measured at room temperature with 2 kinds of gasochromic materials.
• Pd/WO3 shows almost two times the response speed and recovery characteristics of Pd.

This paper presents novel optical hydrogen sensors using metal catalysts on a transparent 3C-SiC membrane and demonstrates the photovoltaic effects. The 3C-SiC membrane was fabricated by anisotropic etching in a TMAH (tetramethyl ammonium hydroxide) solution. Gasochromic materials of Pd and Pd/WO3 were deposited by sputtering on a 3C-SiC membrane for the gas sensing area. Gasochromic materials become transparent when exposed to hydrogen. Light intensity variations, which pass through the 3C-SiC membrane, generate the photovoltaic response of the P–N junction between N-type 3C-SiC and P-type Si. With the ambient gas of nitrogen, Pd and Pd/WO3 do not show photovoltaic variations with any light intensity change. A single layer of Pd shows a higher photovoltaic response compared with the bilayer of Pd/WO3 with hydrogen. However, in a Pd single layer, the phase transition from α to β is experimentally determined at 6%. The Pd/WO3 structure shows a more linear response to hydrogen in the range of 2–10%. Also, Pd/WO3 shows almost two times the response speed and recovery characteristics of Pd. These fast performances are due to the Pd, which improves the chemical reaction between hydrogen and WO3.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 193, 31 March 2014, Pages 42–45
نویسندگان
, ,