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
Korea Advanced Institute of Science and Technology, South Korea, South Korea
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.
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