[17p-A202-1~19] 12.6 Nanobiotechnology

[17p-A202-2] Interdigitated electrode with dense carbon nanotube forests for electrochemical biosensors

〇Hisashi Sugime¹, Takuya Ushiyama², Keita Nishimura², Yutaka Ohno², Suguru Noda³ (1.WIAS, 2.Nagoya Univ., 3.Waseda Univ.)

Keywords:carbon nanotube, interdigitated electrode, biosensor

We applied the dense CNT forests on conductive supports to the interdigitated electrode (IDE) by combining the UV lithography and the CVD process. By optimizing the geometry of the electrodes (width and gap) and the morphology of the CNT forests (height and density), the performance of the IDE was significantly improved. The cyclic voltammetry (CV) measurements showed that the redox current of IDE with CNTs (CNTF-IDE) reached to the diffusion-limited current much more rapidly compared to that of conventional Au-IDE. As a model case of the biomolecules, dopamine (DA) was measured under coexistence of L-ascorbic acid. The selective detection of DA was achieved with the linear range of 100 nM – 100 µM and the limit of detection (LOD, S/N=3) of ~40 nM with the optimized electrode structure.