Interactions and Transport of Charged Species in Bulk and at Interfaces
Electrochemical Biosensors Based on Hierarchical Porous Materials with Facilitated Ion and Electron TransferDo Hyun Kim
Coauthor(s) : Jae-Min Jeong
Dept Chem & Biomol Eng, KAIST, Daejeon, Korea
Porous material for rapid and efficient ion diffusion is essential for the electrode in the development of high-performance electrochemical biosensor . Also, the integration of catalyst and conductive material into highly interconnected architectures makes potentially desirable electrocatalytic material with fast electron transfer . In this context, to understand the role of porous structure, the effect of pore size has been investigated by varying the pore size of material from mesoporous (2−50 nm) to macroporous (>50 nm) and varying the analytical method for the electrochemical analysis (e.g. hydrodynamic voltammetry, chronoamperommetry and AC impedance). This unique electrode structure is beneficial to electrochemical biosensors by providing a large surface area for enzyme immobilization, increased electrode current, and accelerated diffusion of electrolyte ions. In the electrochemical reaction for sensing, the electrode with porous structure exhibits quasi-reversible and diffusion controlled behavior. These structural merits with synergistic effect of active and conductive material lead to a high performance in the detection of analyte having high sensitivity, fast response time, and remarkable stability.
1. M. Yang, J.-M. Jeong, K.G. Lee, D.H. Kim, S.J. Lee, and B.G. Choi, Biosens. Bioelectron., In Press.
2. J.-M. Jeong, S. Seok, B.G. Choi, and D.H. Kim. MRS Advances, DOI: 10.1557/adv.2016.4.