Journal of Adhesion and Interface (접착 및 계면)

The Society of Adhesion and Interface, Korea (한국접착및계면학회)
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Photochromic Spiropyran-Functionalized Organic-Inorganic Hybrid Mesoporous Silica for Optochemical Gas Sensing

광화학적 가스 센싱을 위한 광변색 스피로피란 개질된 유기-무기 하이브리드 메조포러스 실리카

  • Park, Sung Soo (Department of Polymer Science and Engineering, Pusan National University) ;
  • Ha, Chang-Sik (Department of Polymer Science and Engineering, Pusan National University)
  • Received : 2016.12.04
  • Accepted : 2016.12.14
  • Published : 2016.12.30
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Abstract

In this work, mesoporous silica (SBA-15) was synthesized via self-assembly process using triblock copolymer ($PEO_{20}PPO_{70}PEO_{20}$, P123) as template and tetraethyl orthosilicate (TEOS) as silica source under acidic condition. SBA-15 have high surface area ($704m^2g^{-1}$) and uniform pore size (8.4 nm) with well-ordered hexagonal mesostructure. Spiropyran-functionalized SBA-15 (Spiropyran-SBA-15) was synthesized via post-synthesis process using 3-(triethoxysilyl)propyl isocyanate (TESPI) and 1-(2-Hydroxyethyl)-3,3-dimethy-lindolino-6'-nitrobenzopyrylo-spiran (HDINS). Spiropyran-SBA-15 was produced with hexagonal array of mesopores without damage of mesostructre. Surface area and pore size of Spiropyran-SBA-15 were $651m^2g^{-1}$ and 8.0 nm, respectively. Optochemical properties of Spiropyran-SBA-15 was studied with chemical vapors such as EtOH, THF, $CHCl_3$, Acetone and HCl. Main peaks of photofluorescence of Spiropyran-SBA-15 exhibited blue shift in the range of 603.4~592.1 nm after exposure under EtOH, THF, $CHCl_3$, and Acetone vapors. Normalized peak intensities decreased in the range of 0.8~0.3. The main peak of photofluorescence of Spiropyran-SBA-15 showed significant blue shift of 592.1 nm after exposure under HCl vapor, while normalized peak intensity decreased to 0.1.

본 연구에서는 트리블럭 공중합체($PEO_{20}PPO_{70}PEO_{20}$, P123)를 주형으로 사용하고 테트라에틸오르소실리케이트(Tetraethyl orthosilicate, TEOS)를 실리카원으로 사용하여 산 조건 하에서 자기조립 과정을 거친 후 메조포러스 실리카(SBA-15)를 합성하였다. SBA-15는 높은 표면적($704m^2g^{-1}$), 균일한 나노세공(8.4 nm) 그리고 잘 배열된 육방체 구조를 가진다. 스피로피란(Spiropyran) 기가 개질된 SBA-15 (Spiropyran-SBA-15)는 3-(트리에톡시실릴)프로필 이소시아네이트(TESPI)와1-(2-하이드록시에틸)-3,3-이메틸인돌리노-6'-니트로벤조프릴로스피렌(HDINS)을 이용하여 SBA-15에 후처리하여 합성하였다. Spiropyran-SBA-15는 개질 후 나노세공 구조의 손상없이 잘 배열된 육방체 구조를 가졌다. 그리고 표면적과 세공 크기는 각각 $651m^2g^{-1}$와 8.0 nm이었다. 그리고 다양한 화학 기체(EtOH, THF, $CHCl_3$, Acetone, HCl)를 이용하여 Spiropyran-SBA-15의 광화학적 특성을 연구하였다. 유기분자 기체들(EtOH, THF, $CHCl_3$, Acetone)에 대한 광 형광 스펙트라의 주요 발광 피크는 603.4 nm부터 592.1 nm까지 blue shift하였다. 피크 세기는 0.8부터 0.3까지 감소하였다. Spiropyran-SBA-15시료를 HCl 기체에 노출한 후 측정한 광 형광 스펙트럼은 현저한 blue shift를 보여주었다. 광 형광 스펙트럼은 592.1 nm까지 이동하였다. 또한, 광 형광 스펙트럼의 정규화된 피크 세기는 0.1까지 감소하였다.

Keywords

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