Journal of Nanomedicine & Nanotechnology

Fabrication of different types of TiO2 nanostructures and their gas sensing features

13^th International Conference on Nanotek & Expo

December 05-07, 2016 Phoenix, USA

Erdem Sennik

Gebze Technical University, Turkey

Posters & Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

In the last decades, metal oxides have been studied for some application areas such as solar cells, photocatalysts, and batteries. Nano-sized metal oxides are especially utulized more actively in the following fields; piezoelectric materials, optoelectronic devices, solar energy, and gas sensors. In case of fabricated metal oxide nanomaterials, the extraordinarily large surface-to-volume ratio leads to a dominant surface effect due to the increase of specific surface. Hence, high surface area results in the enhancement of the surface related properties such as catalytic activity or surface adsorption. Metal oxides such as zinc oxides, titanium oxides, and tin oxides are the most used nano-sized gas sensor. Among metal oxide-based gas sensors, TiO2 has excellent sensing properties for various gases such as H2, VOCs, NO2, and CO. To improve their gas sensing properties such as sensitivity, response time and working temperature, metal oxides can be modified with different metals. In our study, TiO2 nanotubes, nanowires and nanorods were fabricated by anodization and hydrothermal methods. Fabricated TiO2 nanomaterials have 40-90 nm in diameters and 0.5-40 μm in length. We also achieved to modify TiO2 nanomaterials with catalytic metal materials by some methods such as hydrothermal, cathodization and CVD. Gas sensing properties of pristine and metal-functionalized TiO2 nanomaterials were investigated under dry air flow at the temperature range from 30 °C to 200 °C. The results revealed that the TiO2 nanomaterials modified with metal materials exhibited excellent sensing performance to gases, especially H2 even at room temperature, and also appropriate sensor behavior with clear response-recovery.

Biography :

Email: erdemsennik@gmail.com