Abstract
We design a novel nano-gap electrode to measure the current of DNA molecule, by which the current–voltage characteristics of individual native DNA, Ag-DNA and Ni-DNA molecules are obtained, respectively. The results show that the voltage gap of Ag- and Ni-DNA is higher than that of native DNA, and the conductance is lower than native DNA in neutral environment. The structure transition from B- to Z-DNA is observed in the presence of high concentrations of nickel ions and Ag-DNA appears chaos state by STM image and U-V spectra characterization. But in alkaline environment, the conductance of Ni-DNA rises and the voltage gap decreases with the increasing of nickel ion concentration denotes that the conductive ability of Ni-DNA is higher than that of native DNA.
Highlights
With the development of high-speed processing technology, more integrated silicon devices will be expected to reach a new level
The results show that the voltage gap of Ag- and Ni-DNA is higher than that of native DNA, and the conductance is lower than native DNA in neutral environment
Some reports have showed that the conductive ability of M-DNA is better than that of native DNA [14, 16, 17], while other group reported the conductivity of M-DNA decreases [18]
Summary
With the development of high-speed processing technology, more integrated silicon devices will be expected to reach a new level. Some new materials worked in nano-scale are strongly desired. In this aspect, DNA has received some attentions [1,2,3]. Chemical doping is an effective way for improving the electrical properties of materials, as demonstrated in semiconductors [10] and electrically conductive polymers [11]. The effect of metal ions on the structure of DNA is not clear, and no Nanoscale Res Lett (2010) 5:1431–1436 topological structure has been reported . We have reported the measurement results about the I-V characteristics and structures of native DNA, Ag-DNA and Ni-DNA, respectively, and have discussed the effects of metal ions on conductive ability of single DNA molecules in different environmental conditions
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