YATSKIV Roman Institute of Photonics and Electronics AS CR, v.v.i.

Hydrogen Sensing and Photoelectric Properties of Graphite/ZnO Nanorods Junctions

Co-authors VERDE María, GRYM Jan, HAMPLOVA Marie

The use of hydrogen gas in different areas (such as chemical industry, medicine, hydrogen fuelled vehicles, etc.) requires the development of high sensitivity, short response time, small size and low-cost hydrogen sensors. Zinc oxide (ZnO) has been extensively used as a sensitive material for hydrogen detection. Hydrogen sensors based on bulk ZnO typically involve elevated temperatures in order to increase their sensitivity. In contrast, one dimensional ZnO nanostructures allow the detection of hydrogen at room temperature , due to their much larger surface area, which greatly enhances their sensitivity. In this work the hydrogen sensing and photoelectric properties of graphite/ZnO nanorod junctions were investigated. The ZnO nanorods were prepared by low temperature hydrothermal growth. A Schottky contact to these nanorods was created by deposition of colloidal graphite. Hydrogen sensors based on the graphite/ZnO nanorods junctions showed response to low concentrations of hydrogen even at room temperature. ACKNOWLEDGEMENTS: This work was supported by the EU COST Action TD1105 – project LD14111 of the Ministry of Education CR.