Exploring 1-butanol as a potential liquid precursor for graphene synthesis via chemical vapour deposition and enhanced catalyzed growth methodology

In this study, 1-butanol (C₄H₉OH) was used as a potential precursor for atmospheric pressure chemical vapour deposition grown graphene. While graphene were obtainable at moderate to high precursor flow rate, they were of double to multilayer as evident from Raman and ultra-violet visible spectroscopy. Here, a simple yet novel growth procedure was implemented to obtain monolayer graphene at much lower precursor flow rate. The procedure utilized additional copper which enable a richer flux of carbonaceous radicals to be produced through catalytic decomposition, leading to high-quality monolayer graphene to be grown on copper substrate. This type of graphene was characterized with Raman of two excitation sources, and the results were consistent with each other. It was found that it exhibited highest I_2D/I_G intensity ratio (~ 4.85), largest average crystallite size (L_a, ~ 188 nm), and smallest defect level among other samples. Due to the latter, it possessed lowest sheet resistance compared with other samples (~ 7.75 kΩ/sq). Lastly, the graphene samples were characterized using x-ray photoelectron spectroscopy, where the deconvoluted spectra reveal sub-components of sp² and sp³ states of carbon, which could provide insights on the reaction mechanics about the transformation of butanol to graphene.

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