• 제목/요약/키워드: noncovalent functionalization

검색결과 6건 처리시간 0.207초

Noncovalent Modification of Carbon Nanofibers Using 2-Naphthalenethiol for Catalyst Supports in PEM Fuel Cells

  • Oh, Hyung-Suk;Kim, Han-Sung
    • Journal of Electrochemical Science and Technology
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    • 제1권2호
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    • pp.92-96
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    • 2010
  • A new synthesis method for the preparation of Pt electrocatalysts on carbon nanofibers (CNFs) is reported. In this method, Pt electrocatalysts are loaded onto 2-naphthalenethiol (NT) functionalized CNFs. The noncovalent functionalization of CNFs by NT is the effective way for better distribution of Pt particles and higher electrocatalytic activity in polymer electrolyte membrane fuel cells. It was found that the presence of NT acts as a poison to catalysts. Therefore, it is necessary to remove NT through the heat treatment at $400^{\circ}C$.

Fabrication of top gate Graphene Transistor with Atomic Layer Deposited $Al_2O_3$

  • ;성명모
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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    • pp.212-212
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    • 2013
  • We fabricate and characterize top gate Graphene transistor using aluminum oxide as a gate insulator by atomic layer deposition (ALD). It is found that due to absence of functional group and dangling bonds, ALD of metal oxide is difficult on Graphene. Here we used 4-mercaptopheneol as a functionalization layer on Graphene to facilitate uniform oxide coverage. Contact angle measurement and Atomic force microscopy were used to confirm uniform oxide coverage on Graphene. Raman spectroscopy revealed that functionalization with 4-mercaptopheneol does not induce any defect peak on Graphene. Our device shows mobility values of 4,000 $cm^2/Vs$ at room temperature which also suggest top gate stack does not significantly increase scattering. The noncovalent functionalization method is non-destructive and can be used to grow ultra-thin dielectric for future Graphene applications.

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용매와 분산제의 종류에 따른 그래핀의 분산 거동 (Dispersion Behavior of Graphene with Different Solvents and Surfactants)

  • ;이향무;정인우
    • 접착 및 계면
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    • 제20권2호
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    • pp.53-60
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    • 2019
  • 여러 종류의 용매와 상용화되어 있는 비공유결합성 분산제들을 이용하여 안정한 그래핀 분산액을 제조 하였다. 분산액은 3시간의 초음파 처리를 통하여 제조 되었으며, NMP 용매에서는 Tween 계열과 Span 계열과 Pluronic 계열의 분산제가 안정한 그래핀 분산액을 형성하였다. 또한 에탄올 용매에서는 질소를 포함한 분산제 종류가 안정한 분산액을 형성하였으며, 물과 dichloromethane에서는 모든 분산제에 대하여 대체로 불안정하였지만 poly(4-vinyl pyridine)과 sodium dodecyl sulfonate를 사용한 경우 일부 안정한 분산액을 형성 하였다. 또한 Poly(4-vinyl pyridine), poly(vinyl pyrrolidone), poly(2-(dimethylamino)ethyl methacrylate)를 이용하여 더 큰 용량의 그래핀 분산액을 제조하였다. 본 연구는 그래핀의 분산을 위한 여러 용매 및 분산제에 대한 기준을 제공할 수 있을 것으로 기대된다.