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 journalArticlepeer-review

13 Scopus citations


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
Issue number35
StatePublished - 3 Sep 2008

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