그래핀의 정의와 합성법

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그래핀의 기본적인 원리와 합성법에 대한 피피티

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Introduction

Mechanical Exfoliation

Chemical Exfoliation

Chemically Derived Graphene from Graphite Oxide

Chemical Vapor Deposition

Raman Spectroscopy

본문내용

Peel Off
Tape is pressed down against a sample
Van der Waals attraction to the substrate can delaminate a single sheet when the tape is then lifted away
A much simpler approach that led to the single layer graphene
Simplicity of sample preparation
Limited μm size
Mechanical Exfoliation(2/2)

Chemical Exfoliation
KC8(Graphite Intercalation compound)
Add potassium in Helium filled dry box(<1 ppm H2O and O2)
Heating 200 ℃ overnight until a uniform, bright gold powder was formed
Put in water or ethanol, and washing and filtering
Removal of residual alkali metal by washing and using sonication
Graphen powder microwave heating 15~60sec.
∼ 30layer
Reruire high heating temperature
→using sodium?potassium possible room temperature

Chemically Derived Graphene from Graphite Oxide

Graphite to make Graphite Oxide
→ use Hummer’s method
(Graphite + H2SO4 + KMnO4)
add NaNO3 → to aid in oxidation
Ultrasonicagitation and Rapid heating in water
→ Thin Plate(Graphite Oxide)Seperation(∼hundreds layers)
Centrifugation
→ filtering Graphite Oxide

참고 자료

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