Presentation Information
[1P36]Comparison of growth conditions on the semiconducting properties of CuO nanowires
*Yukito Semba1, Zakaria Ziadi2, Tomoko Kato Shimizu1 (1. Department of Applied Physics and Physico-Informatics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan, 2. Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan)
CuO nanowires (NWs) are metal oxide semiconductors with gas sensing capabilities. To elucidate the semiconducting properties of CuO NWs prepared under different conditions, and to understand the mechanism underlying their response to gas molecules, we compared NWs grown in ambient air with those grown under O2 gas atmosphere using scanning electron microscopy (SEM) and scanning tunneling microscopy (STM). SEM and STM observations revealed belt-like structures, which are attributed to bundles of multiple CuO NWs. Scanning tunneling spectra exhibited intrinsic semiconducting behavior, rather than the expected p-type characteristics. Possible reasons for these unexpected results will be discussed in detail.