Conductance and Work Function of TiO2 Nanotubes Based Gas Sensors

We studied growth process of TiO2 nanotubes and investigated their gas sensing properties using two different approaches such as chemoresistive and Kelwin probe methods. The morphology and the crystal structure of the samples were analyzed using scanning electron microscopy and micro-Raman spectroscopy. Morphological analysis showed that well-aligned and highly ordered nanotubes were obtained by means of electrochemical anodization method. Structural investigations showed the nanotubes were crystallized in the anatase phase after the post-growth annealing. The functional properties of obtained structures were investigated towards different gases in a wide range of operating temperatures. (C) 2015 The Authors. Published by Elsevier Ltd.