Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Encapsulation of ZnSe Quantum Dots within Silica by Water-in-oil Microemulsions

마이크로에멀전을 이용한 실리카에 담지된 ZnSe 양자점 제조

  • Lee, Areum (Department of Chemical & Biological Engineering, Kyungwon University) ;
  • Kim, Ji Hyeon (Department of Chemical & Biological Engineering, Kyungwon University) ;
  • Yoo, In Sang (Department of Chemical & Biological Engineering, Kyungwon University) ;
  • Park, Sang Joon (Department of Chemical & Biological Engineering, Kyungwon University)
  • 이아름 (경원대학교 화공생명공학과) ;
  • 김지현 (경원대학교 화공생명공학과) ;
  • 유인상 (경원대학교 화공생명공학과) ;
  • 박상준 (경원대학교 화공생명공학과)
  • Received : 2011.04.11
  • Accepted : 2011.04.19
  • Published : 2011.06.10
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Abstract

ZnSe quantum dots (QDs) were prepared by employing water-containing Dioctyl sodium sulfosuccinate (AOT) reversed micelles (microemulsions) and the silica-encapsulated ZnSe QDs were obtained by a direct injection of tetraethyl orthosilicate (TEOS) into the microemulsion system. When the QDs were coated by silica, well-defined spherical shapes were formed and the average size of the QDs was near 7 nm. In addition, the photoluminescence (PL) efficiency of the QDs was reduced from 8.0 to 1.1% as they were encapsulated by silica. However, the solid layers of the silica-encapsulated ZnSe QDs on gold surfaces showed the excellent photostability. In particular, they are cadmium free and thus, less toxic. Moreover, the present method does not require a hot reaction temperature or extremely toxic H2Se gas as a Se precursor. Accordingly, the method can be a safer and more economical process for producing silica-encapsulated ZnSe QDs, which may be a potential media for biosensors.

ZnSe 양자점을 AOT 마이크로에멀전을 이용해서 제조하였으며, tetraethyl orthosilicate (TEOS)를 직접 주입하는 방법으로 실리카에 담지된 ZnSe 양자점 소재를 얻었다. 양자점이 실리카에 담지되었을 때, 상대적으로 고른 구 형태의 ZnSe 양자점을 얻을 수 있었고 그 크기는 약 7 nm이었다. 아울러 마이크로에멀전상의 ZnSe 양자점이 실리카에 담지되면 photoluminescence 효율은 8%에서 1.1%로 감소하였다. 그러나 금표면에 실리카에 담지된 ZnSe 고체 박막을 형성시켰을 때, 양자점의 광학안정성은 크게 증가함을 알 수 있었다. 특히 ZnSe 양자점은 카드뮴이 없어 독성이 작으며 기존의 ZnSe 제조 시 Se 전구체로 사용하는 맹독성의 $H_2Se$ 가스나 높은 반응 온도를 필요로 하지 않는다. 따라서 바이오센서용 등으로 사용이 가능한 실리카에 담지된 ZnSe 양자점을 안전하고 경제적인 방법으로 생산할 수 있는 방법을 제시할 수 있었다.

Keywords

Acknowledgement

Supported by : Kyungwon University

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