Toward the DNA electronics

DNA is one of the most promising molecules as the scaffold for molecular nanotechnology and nanoelectronics. For realizing the molecular devices constructed with DNA, three kinds of function is required such as (1) circuit and control of the conductivity, (2) switching and (3) storage. We have found that the electrical conducting properties of the DNA networks are strongly depended on the doping condition. Photo-switching (current enhancement with shining the light) and magnetoresistance effect are observed in the dye-modified DNA and Co ions doped DNA, respectively. Furthermore, DNA network pattern can be patterned on the Si/SiO2 surface. These results have significant implications for the application of DNA in electronic devices and in DNA-based electrochemical biosensors.