Abstract
To enhance the detection sensitivity towards hydrogen, a novel point contact TiO2 nanotube decorated with PdxO Schottky barrier diode (SBD) was proposed and investigated in this paper. TiO2 nanotube arrays were fabricated on Ti wires by electrochemical anodic oxidation, and Pd catalytic nanoparticles were modified by micro-emulsion electrochemical deposition. The surface morphology was characterized by field emission scanning electron microscopy (FESEM), and the hydrogen sensitivity of the point contact between TiO2 nanotubes was investigated. It exhibited high sensitivity under working temperature of 70oC, and the sensitivity of SBD to 2000ppm hydrogen was about 8500. Impedance spectroscopy, the current–voltage (I-V) characteristic measurement and infrared spectroscopy were also employed for further mechanism investigation. From the I-V curves, we found the Schottky barrier was formed on the contact and the barrier height decreased with increase of hydrogen. The sensing processes of the charge transfer were unveiled according to the different time constants and that mechanism was in reasonable support of IR surface analysis. This information may provide some insight on the understanding of the device physics of this new emerging nanotube array based SBD which will have broaden application in hydrogen energy and related security system.
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