화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.43, No.2, 302-308, March, 2019
DOI10.7317/pk.2019.43.2.302  Export Citation
공액화 고분자-그래핀 옥사이드 복합체의 턴-온 형광 변화를 이용한 세슘 이온 감지
Turn-On Detection of Cs Ions Based on Conjugated Polymer-Graphene Oxide Composite
장근석, 조은비, Laurence M. Harwood1, 이택승†
  • 충남대학교 유기소재·섬유시스템공학과
  • 1University of Reading Department of Chemistry
Geunseok Jang, Eunbee Cho, Laurence M. Harwood1, and Taek Seung Lee†
  • Organic and Optoelectronic Materials Laboratory, Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 34134, Korea
  • 1Department of Chemistry, University of Reading, Reading RG6 6AH, United Kingdom, UK
E-mail:
초록
세슘 이온의 검출과 함께 형광이 증가하는 턴-온 형광센서를 공액화 고분자(CP)와 그래핀 옥사이드(GO)로 구성된 복합체로 제조하였다. 세슘 이온과 상호작용을 위해 CP의 곁사슬에 테트라에틸렌 글라이콜(TEG)기를 도입하였다. GO는 유기분자와 소수성 상호작용하여 소수성인 CP와 쉽게 복합체를 형성하는 특성을 가지며, 복합체를 형성하면 CP에서 GO로 에너지 전달이 일어나 CP의 형광이 사라지게 된다. CP-GO 복합체가 세슘 이온에 노출되면 CP의 곁사슬인 테트라에틸렌 글라이콜과 세슘 이온이 결합하고, 이로 인해 CP와 GO의 상호작용이 약회되어 CP가 GO로부터 유리되며, 이탈된 CP는 원래의 형광을 회복하게 된다. 이는 세슘 이온을 선택적으로 감지하는 형광 턴-온 센서로 사용가능하게 된다.
New type of “turn-on” fluorescent sensor for Cs ion was developed using a composite of blue-emissive conjugated polymer (CP) and graphene oxide (GO). Ethylene glycol units were introduced to the side chain of CP, which could interact with Cs ions. The CP and GO formed a stable, nonfluorescent composite, because of hydrophobic and π-π interactions between them. In the presence of Cs ions, the CP was released from the CP-GO composite because of higher affinity of Cs ions with ethylene glycol units in the CP. Such a weaker interaction between CP and GO led to the recovery of initial blue fluorescence of the CP. The degree of fluorescence restoration would be a measure of the concentration of Cs ions. Thus, fluorescence “turn-on” from CP-GO was attributed to the presence of Cs ions.
Keywords:conjugated polymers;graphene oxide;Cs ion detection;fluorescence;sensors
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