Synthesis and applications of functional nanostructures using chemically or genetically controlled templates화학적 또는 유전공학적으로 조절되는 주형을 이용한 기능성 나노 구조체의 합성 및 응용

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Functional nanostructures can be used for a wide range of potential applications in energy conversion and storage devices, catalytic systems, sensors, electronic devices, etc. While they provide a large surface area and unique properties originated form confined nanoscale sizes, poor dispersion stability and consequent structural changes often impose limitations to their practical uses. Recent studies revealed that surface-engineered templates can prevent aggregation and maintain intrinsic properties of functional nanostructures. In addition, it provides porous structures with a large surface area and guides the formation of functional nanostructures and the well-controlled assembly of small molecules. Here, we introduce chemical and biological methods for surface modification to synthesize and assemble functional nanostructures and their applications to catalysis and piezoelectric energy harvesting. As for a chemical approach, polydopamine (PDA), a mussel-inspired adhesive, is applied to functional coatings of polymer nanofibers prepared using an electrospinning process. Electrospining is a widely used facile method to fabricate porous polymer nanofibers with a large surface area. Gold nanoparticles are synthesized onto the PDA-coated poly (e-caprolactone) nanofibers through spontaneous reduction of gold ions on the polymer surface. The catechol group of PDA has a redox potential of 0.53 V (vs. NHE) at pH 7. As for a biological approach, genetically programmed M13 virus is used as a genetically modified template for the synthesis of anisotropic BaTiO3 (BTO) nanostructures. M13 virus is genetically modified to display a glutamate trimer (E3), making the surface of M13 virus negatively charged in alkaline conditions and realizing the self-assembly of cationic metal precursors. After thermal treatment, tetragonal BTO nanostructures with a high crystallinity and piezoelectricity are generated. Since the M13 virus has a filamentous structure, the synthesized BTO n...
Advisors
Nam, Yoon-Sungresearcher남윤성
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
569138/325007  / 020123138
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2014.2, [ vii, 54 p. ]

Keywords

Surface modification; M13 파지; 파지디스플레이; 폴리도파민; 홍합 모방 화학; 주형 기반 합성; template-mediated synthesis; mussel-inspired chemistry; polydopamine; phage display; M13 bacteriophage; 표면 기능화

URI
http://hdl.handle.net/10203/197378
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=569138&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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