Ni2+ doping DNA: A semiconducting biopolymer

Peng Chung Jang Jian, Tzeng Feng Liu, Chuan Mei Tsai, Ming Shih Tsai, Chia-Ching Chang*

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

DNA is a one-dimensional nanowire in nature, and it may not be used in nanodevices due to its low conductivity. In order to improve the conducting property of DNA, divalent Ni2+ are incorporated into the base pairs of DNA at pH≥8.5 and nickel DNA (Ni-DNA) is formed. Conducting scanning probe microscopy (SPM) analysis reveals that the Ni-DNA is a semiconducting biopolymer and the Schottky barrier of Ni-DNA reduces to 2 eV. Meanwhile, electrochemical analysis by cyclic voltammetry and AC impedance shows that the conductance of Ni-DNA is better than that of native DNA by a factor of approximately 20-fold. UV spectroscopy and DNA base pair mismatch analyses show that the conducting mechanism of Ni-DNA is due to electrons hopping through the π-π stacking of DNA base pairs. This biomaterial is a designable one-dimensional semiconducting polymer for usage in nanodevices.

Original languageEnglish
Article number355703
JournalNanotechnology
Volume19
Issue number35
DOIs
StatePublished - 3 Sep 2008

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    Jang Jian, P. C., Liu, T. F., Tsai, C. M., Tsai, M. S., & Chang, C-C. (2008). Ni2+ doping DNA: A semiconducting biopolymer. Nanotechnology, 19(35), [355703]. https://doi.org/10.1088/0957-4484/19/35/355703