Room Temperature Hydrogen Gas Sensor using Pd/Carbon Nanotubes Buckypaper

The proposed study describes the development of a carbon nanotube (CNT)-based gas sensor capable of detecting the presence of hydrogen (H2) gas at room temperature. CNT yarn used in the proposed sensor was fabricated from synthesized CNT arrays. Subsequently, the yarn was treated by means of a simple one-step procedure, called acid treatment, to facilitate removal of impurities from the yarn surface and forming functional species. To verify the proposed sensor’s effectiveness with regard to detection of H2 gas at room temperature, acid-treated CNT and pure yarns were fabricated and tested under identical conditions. Corresponding results demonstrate that compared to the untreated CNT yarn, the acid-treated CNT yarn exhibits higher sensitivity to the presence of H2 gas at room temperature. Additionally, the acid-treated CNT yarn was observed to demonstrate excellent selectivity pertaining to H2 gas.

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A Room-temperature Hydrogen Gas Sensor Using Palladium-decorated Single-Walled Carbon Nanotube/Si Heterojunction

Materials Science ◽

10.5755/j01.ms.22.2.12925 ◽

2016 ◽

Vol 22 (2) ◽

Cited By ~ 1

Author(s):

Yong Gang DU ◽

Hai Xia ZHENG ◽

Hao NI

Keyword(s):

Carbon Nanotube ◽

Gas Sensor ◽

Room Temperature ◽

Hydrogen Gas ◽

Single Walled Carbon Nanotube ◽

Single Walled Carbon

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A Robust Fiber Bragg Grating Hydrogen Gas Sensor Using Platinum-Supported Silica Catalyst Film

Journal of Sensors ◽

10.1155/2018/5810985 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Marina Kurohiji ◽

Seiji Ichiriyama ◽

Naoki Yamasaku ◽

Shinji Okazaki ◽

Naoya Kasai ◽

...

Keyword(s):

Fiber Bragg Grating ◽

Gas Sensor ◽

Temperature Change ◽

Catalytic Combustion ◽

Room Temperature ◽

Precursor Solution ◽

Hydrogen Gas ◽

Combustion Heat ◽

Catalyst Film ◽

Sensor Device

A robust fiber Bragg grating (FBG) hydrogen gas sensor for reliable multipoint-leakage monitoring has been developed. The sensing mechanism is based on shifts of center wavelength of the reflection spectra due to temperature change caused by catalytic combustion heat. The sensitive film which consists of platinum-supported silica (Pt/SiO2) catalyst film was obtained using sol-gel method. The precursor solution was composed of hexachloroplatinic acid and commercially available silica precursor solution. The atom ratio of Si : Pt was fixed at 13 : 1. A small amount of this solution was dropped on the substrate and dried at room temperature. After that, the film was calcined at 500°C in air. These procedures were repeated and therefore thick hydrogen-sensitive films were obtained. The catalytic film obtained by 20-time coating on quartz glass substrate showed a temperature change 75 K upon exposure to 3 vol.% H2. For realizing robust sensor device, this catalytic film was deposited and FBG portion was directly fixed on titanium substrate. The sensor device showed good performances enough to detect hydrogen gas in the concentration range below lower explosion limit at room temperature. The enhancement of the sensitivity was attributed to not only catalytic combustion heat but also related thermal strain.

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