Conductance measurement of a DNA network in nanoscale by point contact current imaging atomic force microscopy
Conductance measurement of a DNA network in nanoscale by point contact current imaging atomic force microscopy
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DOI：
10.1063/1.1886265
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发表时间：
2005-03
影响因子：
4
通讯作者：
Ayumu Terawaki;Y. Otsuka;HeaYeon Lee;T. Matsumoto;Hidekazu Tanaka;T. Kawai
中科院分区：
文献类型：
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作者：
Ayumu Terawaki;Y. Otsuka;HeaYeon Lee;T. Matsumoto;Hidekazu Tanaka;T. Kawai
我们使用点接触电流成像原子力显微镜（PCI-AFM）在不同湿度条件下测量了DNA网络的电导率，作为空间分辨电流图像。通过PCI-AFM同时观察形貌和电流图像，可以在纳米尺度范围内提供有关生物和软质材料电学性质的信息。在干燥条件下（0%湿度），DNA网络和云母表面的电流没有差异，而在60%高湿条件下，当偏置电压为5V时，DNA网络的电流比云母表面的电流大20pA。
We measured the electrical conductivity of a DNA network as a spatially-resolved current-image using point-contact current imaging atomic force microscopy (PCI-AFM) under various humidity conditions. The simultaneous observation of topography and current image by PCI-AFM can provide information pertaining to the electrical properties of biological and∕or soft materials in the nano-scale range. Under dry condition (0% humidity), no difference was observed for the electrical current both of the DNA network and mica surface, whereas the electrical current along the DNA network was larger than that of the mica surface by 20pA at a bias voltage of 5V under high humidity conditions of 60%.