Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Dual-Mode Sensor Based on Ag-Nanoaggregate/Reduced Graphene Oxide Nanocomposite for Screening Organic Contaminants

유기오염물질 스크리닝을 위한 은 나노응집체/환원된 산화 그래핀 나노복합체 기반의 듀얼 모드 센서 개발

  • Yoonsung Oh (Department of Chemical and Material Engineering, The University of Suwon) ;
  • Junghoon Shin (Reliability Test 2 Team, STAT chipPAC Korea_Ltd) ;
  • Jinhyuk Park (Department of Chemical and Material Engineering, The University of Suwon)
  • 오윤성 (수원대학교 화학공학과) ;
  • 신정훈 (스태츠칩팩코리아 신뢰성 2팀) ;
  • 박진혁 (수원대학교 화학공학과)
  • Received : 2025.09.04
  • Accepted : 2025.09.29
  • Published : 2025.10.10
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Abstract

This study introduces an innovative dual-mode sensor concept utilizing a distinctive nanocomposite composed of reduced graphene oxide combined with Ag-nanoaggregates (AgNA) capped by a cationic surfactant. The sensor is engineered to deliver simultaneous dual signals: a continuous resistance signal derived from a chemiresistive (CR) sensor and intermittent signals obtained via surface-enhanced Raman spectroscopy (SERS). The structural and optical characteristics of the nanocomposite were thoroughly characterized using multiple analytical techniques, including scanning electron microscopy, Fourier transform infrared spectroscopy, and UV-Vis spectroscopy. Furthermore, the initial resistance of the CR sensor was optimized by varying the concentration of AgNA within the nanocomposite. Under optimized conditions, the sensor's performance was evaluated using two representative charged organic dyes, rhodamine 6G and rose bengal, to assess its dual sensing capabilities. The adsorption of these analytes onto the sensor surface was detected through abrupt changes in the real-time electrical resistance signal, while subsequent qualitative and quantitative analyses were facilitated by the distinct SERS spectra corresponding to each analyte. In conclusion, these findings demonstrate that the proposed dual-mode sensor constitutes a promising platform for the real-time monitoring of environmental organic contaminants.

본 연구에서는 환원된 산화 그래핀과 양이온성 계면활성제로 캡핑된 은 나노응집체(Ag-nanoaggregate, AgNA)를 결합한 나노복합체 기반 듀얼 모드 센서를 제작하였다. 제안된 센서는 화학저항성(chemiresistive, CR) 기반의 실시간 저항 신호와 표면 증강 라만 분광법(surface-enhanced Raman spectroscopy, SERS) 기반의 초고감도 분석을 동시에 구현한다. 나노복합체의 구조적 및 광학적 특성은 주사 전자 현미경, 푸리에 변환 적외선 분광법, 자외선-가시광선 분광법으로 검증하였다. 또한 AgNA 농도를 변화시켜 CR 센서의 초기 저항을 최적화했다. 최적 조건에서 전하를 띠는 대표적인 유기 염료인 로다민과 로즈 벵갈을 사용하여 듀얼 모드 센서 감지 성능을 평가한 결과, 실시간 저항 신호로 흡착을 감지하고 SERS 스펙트럼으로 정성 및 정량 분석이 가능함을 확인하였다. 따라서 본 듀얼 모드 센서는 CR의 실시간 모니터링 능력과 SERS의 분자 식별 능력을 상호 보완적으로 결합하여, 환경 중 유기 오염 물질을 정성 및 정량적으로 실시간 모니터링이 가능한 유망한 분석 플랫폼임을 입증하였다.

Keywords

References

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