Abstract
Platinum sensitized titania nanotubes (Pt/TiO2 NTs) is a promising material for hydrogen (H2) sensing. TiO2 NTs powder was prepared through rapid breakdown anodization (RBA) and was sensitized with Pt NPs by chemical reduction of chloroplatinic acid. The morphological characterization revealed the tubular architecture of TiO2 NTs with length around 6 μm, diameter of about 20 nm and wall thickness measuring about 3 to 4 nm. The structural analysis confirmed the TiO2 NTs to be in anatase phase and Pt NPs to be in FCC crystal structure. Compositional studies established the effective presence of Pt NPs over TiO2 NTs. The vibrational spectroscopic analysis indicated that in TiO2, Ti4+ state is present with the tetragonal arrangement. The thermal stability investigation revealed that the Pt/TiO2 NTs nanocomposites are stable up to 550 °C thereby indicating the materials are suitable to be used in the temperatures under present investigation. The thick film H2 sensor made using a paste of Pt/TiO2 and the sensor behaviour towards H2 in argon (H2/Ar) was studied as a function of Pt loading and temperature. Increase in the Pt loading was found to enhance the sensor response initially but at higher loading the response decreased substancially. Sensitivity to hydrogen was found to increase with temperature with the needed linearity. At higher temperatures, the sensor response of the Pt/TiO2 NTs saturated beyond a certain threshold limit. The sensor behaviour was also observed to be selective only to H2 gas amid the presence of methane, ammonia and nitrogen oxide gases.
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