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Синтез многослойного графена методом газофазного осаждения на меди

Синтез многослойного графена методом газофазного осаждения на меди

Abstract

Проведены эксперименты по синтезу графена методом химического осаждения из газовой фазы, при атмосферном давлении на медных подложках. В роли газа прекурсора использовался метан, в качестве подложек использовалась медная фольга толщиной 30 мкм. Эксперименты проведены при различных температурах (970–1010 °С), составах газовой смеси (Ar/He+H2+CH4), временах экспозиции (5–30 мин), скоростях охлаждения образцов. Анализ синтезированных пленок проведен методом спектроскопии комбинационного рассеяния (КР). Обнаружено, что параметры охлаждения существенно влияют на полученные пленки. Показано, что при синтезе с низкой концентрацией метана (~ 1 %) получаются наименее дефектные графеновые пленки. В экспериментах получены образцы многослойного графена, наименьшее количество слоев (2–5) достигается при температуре реактора 1000 °С, газовой смеси (Ar:H2:CH4=100:3:10 н.см3/мин), времени экспозиции 30 минут и быстром остывании в этой же газовой смеси. Наилучшее качество (отношение D/G линий) достигается при температуре реактора 980 °С, газовой смеси (Ar/Н2/CH4 = 100/5/1 н. см3/мин), времени экспозиции 30 минут и быстрой закалке.

Graphene was synthesized by chemical vapor deposition at atmospheric pressure on copper substrates. Methane gas was used as carbon source, as substrates used copper foil thickness of 30 microns. The experiments were performed at different temperatures (970–1010 °C), gas mixture (Ar / He + H2 + CH4), exposure times (5-30 min.), cooling rates of the samples. The synthesized films were analyzed with Raman spectroscopy (RS). It was found that the cooling parameters significantly affect the resulting films. It is shown that the synthesis with a low concentration of methane (~ 1 % ) are obtained by the least defective graphene films. In the experiments were synthesized few-layer graphene. Least layers ( 2-5) were observed at a reactor temperature 1000 °C, the gas mixture (Ar: H2: CH4 = 100:3:10 sccm), exposure time 30 min and rapid cooling. The best quality Graphene structures (the ratio D / G lines ) were observed at a reactor temperature 980 ° C, the gas mixture (Ar/Н2/CH4 = 100/5/1 sccm ), exposure time 30 minutes and fast cooling in the same gas mixture.

Keywords

СПЕКТРОСКОПИЯ КОМБИНАЦИОННОГО РАССЕЯНИЯ, ТЕРМИЧЕСКОЕ РАЗЛОЖЕНИЕ УГЛЕВОДОРОДОВ, ГРАФЕН

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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