Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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A Non-enzymatic Hydrogen Peroxide Sensor Based on CuO Nanoparticles/polyaniline on Flexible CNT Fiber Electrode

CuO Nanoparticles/polyaniline/CNT fiber 유연 전극 기반의 H2O2 검출용 비효소적 전기화학 센서

  • Min-Jung Song (Department of Nano Convergence Engineering, Seokyeong University)
  • 송민정 (서경대학교 나노융합공학과)
  • Received : 2022.11.17
  • Accepted : 2023.01.13
  • Published : 2023.05.01
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Abstract

In this study, a CNT fiber flexible electrode grafted with CuO nanoparticles (CuO NPs) and polyaniline (PANI) was developed and applied to a nonenzymatic electrochemical sensor for H2O2 detection. CuO NPs/PANI/CNT fiber electrode was fabricated through the synthesis and deposition of PANI and CuO NPs on the CNT fiber surface using an electrochemical method. Surface morphology and elemental composition of the CuO NPs/PANI/CNT fiber electrode were characterized by scanning electron microscope with energy dispersive X-ray spectrometry. And its electrochemical characteristics were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronoamperometry (CA). Compared with a bare CNT fiber as a control group, the CuO NPs/PANI/CNT fiber electrode showed a 4.78-fold increase in effective surface area and a 8.33-fold decrease in electron transfer resistance, which leads to excellent electrochemical properties such as a good electrical conductivity and an efficient electron transfer. These improved characteristics were due to the synergistic effect through the grafting of CNT fiber, PANI and CuO NPs. As a result, this electrode enhanced the H2O2 sensing performance.

우리는 금속 산화물 CuO nanoparticles (CuO NPs)과 전도성 고분자 Polyaniline (PANI)가 접목된 CNT fiber 유연 전극(CuO NPs/PANI/CNT fiber 전극)을 개발하여 H2O2 검출용 비효소적 전기화학센서에 적용하였다. CNT fiber 표면 위에 PANI와 CuO NPs을 전기화학적 합성/증착을 통해 제작된 CuO NPs/PANI/CNT fiber 전극은 주사전자 현미경(SEM)과 에너지분산형 분광분석법(EDS)을 통해 표면 분석이 수행되었으며, 순환전압 전류법(CV)과 전기화학 임피던스법(EIS), 시간대전류법(CA)을 이용하여 전기화학적 특성 및 H2O2 센싱 성능이 분석되었다. CuO NPs/PANI/CNT fiber 전극은 대조군인 bare CNT fiber 전극과 비교하여 약 4.78배의 유효 표면적 증가를 보였으며, 약 8.33배의 전자 전달 저항(Ret) 감소로 인한 우수한 전기 전도성 및 효율적인 전자전달 등의 전기화학적 특성을 나타냈다. 이런 향상된 전극 특성은 CuO NPs와 PANI의 접목을 통한 시너지 효과에 기인한 것으로, 결과적으로 H2O2 검출에 대한 센싱 성능이 개선되었다.

Keywords

Acknowledgement

본 연구는 2022년도 서경대학교 교내연구비 지원에 의하여 이루어졌음.

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