Formation of quantum dots in single stranded DNA-wrapped single-walled carbon nanotubes

Li, Y. F.; Kaneko, T.; Hatakeyama, R.
January 2010
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p023104
Academic Journal
The transport properties of single-stranded DNA (ssDNA) wrapped single-walled carbon nanotubes (SWNTs) are studied from low to room temperature. Atomic force microscopy reveals a regularly patterned geometry of ssDNA molecules on the surface of SWNTs. Our measurements indicate that the semiconducting behavior of SWNTs is drastically changed after ssDNA modification, showing a clear charge-transfer process at room temperature. At low temperatures single-electron tunneling features are observed up to 80 K, demonstrating clearly that quantum dots in series are created in the SWNTs due to the ssDNA wrapping.


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