Doping effect for ionic conductivity in DNA film
Doping effect for ionic conductivity in DNA film
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DOI：
10.1016/j.synthmet.2005.07.004
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发表时间：
2005-09-22
期刊：
影响因子：
4.4
通讯作者：
Ikehata, S
中科院分区：
文献类型：
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作者：
Matsuo, Y;Sugita, K;Ikehata, S
我们研究了H+和Rb+等离子在DNA薄膜导电性中的作用。基于电导率的相对湿度依赖性，发现DNA膜的电导率强烈依赖于相对湿度h，其依赖性可分为三个区域：（I：h < 17%），（II：17% < h < 59%）和（III：h > 59%）.此外，由于移动的质子的出现，在区域（II）和（III）中H-1-NMR吸收线变窄。这些结果表明，移动的质子在区域（II）和（III）的电导率中起重要作用。此外，基于这些结果，可以推断，在区域（II）的导电性是由质子从一个PO 4四面体跳跃到另一个伴随着氢键的断裂和重排。此外，我们还观察到掺铷离子的DNA膜的电导率增加。
We have investigated the role of ions such as H+ and Rb+ in the electrical conductivity of DNA films. On the basis of the relative humidity dependence of electrical conductivity, the electrical conductivity of DNA films is found to strongly depend on relative humidity h and its dependence comprises three regions: (I: h < 17%), (II: 17% < h < 59%), and (III: h > 59%). Moreover, the H-1-NMR absorption line becomes narrow in regions (II) and (III) due to the appearance of mobile protons. These results indicate that mobile protons play an important role in the electrical conductivity in regions (II) and (III). Furthermore, based on these results, it is deduced that the electrical conductivity in region (II) is caused by proton hopping from one PO4 tetrahedron to another accompanied by the breaking and rearrangement of the hydrogen bond. In addition, we have also observed that the electrical conductivity increases by doping rubidium ions into DNA film.