Evidence for surface states in a single 3 nm diameter Co3O4 nanowire

Yi Sun; Ji-Yong Yang; Rui Xu; Lin He; Rui-Fen Dou; Jia-Cai Nie
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p262106
Academic Journal
The electronic local density of states of a single Co3O4 semiconductor nanowire with the diameter of 3 nm is explored using low-temperature scanning tunneling microscopy and spectroscopy. The energy gap between the conduction band and valence band of the nanowire is about 1.7 eV, which is slightly enhanced compared to the bulk value, ∼1.5 eV, due to the quantum confinement effect. Two surface states are observed locating near the Fermi level in the band gap.


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