Hydrogen sensor based on palladium nanotube arrays fabricated by novel low-temperature hydrothermal synthesis

Palladium (Pd) nanotube array was fabricated by a facile solution process using hydrothermally synthesized ZnO nanowires as sacrificial templates and Pd precursor solution. The morphology, structure, and composition of the nanotubes were characterized by SEM, TEM, HAADF-STEM, and ICP-ACS, respectively. To investigate hydrogen sensing performance, Pd nanotube arrays were fabricated on interdigitated electrodes of a silicon chip and the electrical resistance change of Pd nanotube array sensor was measured depending on the concentration of hydrogen gas and operating temperature. Pd nanotube arrays sensor was also fabricated on polymer substrate by the same method and exhibited a good hydrogen detection performance.