Conductive-tip atomic force microscopy of CdSe colloidal nanodots

被引:15
作者
Tanaka, I
Kawasaki, E
Ohtsuki, O
Uno, K
Hara, M
Asami, H
Kamiya, I
机构
[1] Wakayama Univ, Dept Chem & Mat Sci, Wakayama 6408510, Japan
[2] RIKEN, Frontier Res Syst, Wako, Saitama 3510198, Japan
[3] Mitsubishi Chem Corp, Sci & Technol Res Ctr, Aoba Ku, Yokohama, Kanagawa 2278502, Japan
关键词
atomic force microscopy; electrical transport (conductivity; resistivity; mobility; etc.); quantum effects; semiconductor-insulator interfaces; cadmium selenide;
D O I
10.1016/S0039-6028(03)00088-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electronic properties of individual Use colloidal nanodots have been investigated by conductive-tip atomic force microscopy (AFM). Submonolayer-thick films of the colloidal nanodots were fabricated on a self-assembled monolayer of alkanethiol molecules formed on Au(111) surfaces for single dot measurements. First, we simultaneously imaged the topography and conductivity of isolated single dots by AFM operating in contact mode with a conductive tip under appropriate bias voltages. In the current image, it is found that the dot regions have higher electric resistances due to tunneling resistance through the Use dots. We found a 10-nm scale,electric inhomogeneity around the dots, which may correspond to the previously reported etch-pits of Au(111) surfaces formed during the deposition of the alkanethiol molecules. Then, current-voltage characteristics were measured with the conductive tip positioned on the single dots; large changes in the conductivity which suggest resonant tunneling through the quantized energy level in the dot were observed even at room temperature. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:801 / 805
页数:5
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