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탄소나노튜브 대면적 어셈블리를 통한 고감도-고선택성 과산화수소 센서 개발
이동욱 ( Dongwook Lee ),안희호 ( Heeho Ahn ),서병관 ( Byeong-Gwuan Seo ),이승우 ( Seung-woo Lee ) 한국센서학회 2021 센서학회지 Vol.30 No.4
This study presents a simple approach for the assembly of a free-standing conductive electronic nanofilm of single-walled carbon nanotubes (SWNTs) suitable for enzymatic electrochemical biosensors. A large-scale SWNT electronic film was successfully produced by the dialysis of p-Terphenyl-4,4´´-dithiol (TPDT)-treated SWNTs. Furthermore, Horseradish peroxidase (HRP) was immobilized on the TPDT-SWNT electronic film, and the enzymatic detection of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) was demonstrated without mediators. The detection of H<sub>2</sub>O<sub>2</sub> in the negative potential range (-0.4 V vs. Ag/AgCl) was achieved by direct electron transfer of heme-based enzymes that were immobilized on the TPDT-SWNT electronic film. The SWNT-based biosensor exhibited a wide detection range of H<sub>2</sub>O<sub>2</sub> from 10 μM to 10mM. The HRP-doped SWNT electronic film achieved a high sensitivity of 342 μmA/mM·㎠ and excellent selectivity against a variety of redox-active interfering substances, such as ascorbic acid, uric acid, and acetaminophen.