Synthesis of porous silica-coated Au sponges and its catalytic applications = 다공성 실리카가 코팅 된 금 스폰지의 개발과 촉매 활용에 관한 연구

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Au sponges have been of great interests in recent years due to their unique morphologies and excellent physical properties that provide a broad spectrum of applications in surface-enhanced Raman, catalysis, energy storage and actuator. However, the structure instability at high temperature or catalytic reaction conditions, which result in the loss of their physical properties, limiting their practical use in many applications. First, we report a facile and green synthesis method for Au sponges using self-assembly of gold nanoparticles induced by thiolated poly (ethylene glycol). The use of very low concentration of SH-PEG (ca. 20-200 nM) in aqueous solution at room temperature makes the method highly eco-friendly as well as results in high-purity as-synthesized gold sponges (98.7 wt %). The gold sponges fabricated with the present method exhibit a high SERS activity, making them highly applicable for sensitive SERS detection of molecules. A new synthetic method, which reported in this dissertation, would be a good candidate to solve the problem in the synthesis of Au sponges. Second, a new method to make Au sponges which prepared by self-assembly of Au NPs stable up to 700 °C by coating the surface of Au sponges with porous silica. Additionally, the porous silica coated Au sponges show very high catalytic activity for the reduction of 4-nitrophenol and excellent reusability as maintaining their activity as high as 93 % after 10 cycles of catalytic reactions. To the best of our knowledge, this is the first report of porous silica coated Au sponges which provide excellent thermal stability, high catalytic activity and reusability simultaneously. The new method, which developed in the dissertation, would be applicable to other Au sponges prepared by dealloying method or deposition of $TiO_2$ on Au sponges instead of $SiO_2$ for synergetic effect.
Advisors
Choi, Sung-Minresearcher최성민researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2017.8,[vi, 73 p. :]

Keywords

Au sponge▼aporous silica coating▼athermal stability▼acatalysis▼asurface-enhanced Raman scattering; 금 스폰지▼a다공성 실리카 코팅▼a열 안정성▼a촉매 반응▼a표면증강 라만 산란

URI
http://hdl.handle.net/10203/265071
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=866967&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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