Cha Misun, Jung Seungwon, Cha Moon-Hyun, Kim Gunn, Ihm Jisoon, Lee Junghoon
Department of Physics and Astronomy, FPRD, Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Korea.
Nano Lett. 2009 Apr;9(4):1345-9. doi: 10.1021/nl8029948.
A field effect transistor (FET) measurement of a single-walled carbon nanotube (SWNT) shows a transition from a metallic one to a p-type semiconductor after helical wrapping of DNA. Water is found to be critical to activate this metal-semiconductor transition in the ssDNA-SWNT hybrid. Raman spectroscopy confirms the same change in electrical behaviors. According to our ab initio calculations, a band gap can open up in a metallic SWNT with wrapped ssDNA in the presence of water molecules due to charge transfer.
对单壁碳纳米管（SWNT）进行的场效应晶体管（FET）测量显示，在DNA进行螺旋包裹后，其从金属性转变为p型半导体。研究发现，水对于激活单链DNA-单壁碳纳米管（ssDNA-SWNT）杂化物中的这种金属-半导体转变至关重要。拉曼光谱证实了电行为的相同变化。根据我们的从头算计算，由于电荷转移，在存在水分子的情况下，包裹有单链DNA的金属性单壁碳纳米管中会打开一个带隙。
