Abstract

ConceptAmong the several synthesis methodologies for graphene, chemical vapor deposition (CVD) on copper foils allows the production of graphene on large area. A strong correlation has been reported between grain sizes and sheet resistance in CVD-graphene1. Thus, improving the quality of CVD-graphene requires the optimization of the synthesis process to provide an increase in average grain size1,2. Therefore, diagnostic methodologies for the accurate monitoring of grain sizes and distribution directly on the copper substrate is needed. In this work we exploit a wet chemistry approach for the selective oxidation of the copper substrate through graphene grains rendering their boundaries visible by optical microscopy. We use the Fenton reaction as a source of hydroxyl radicals to functionalize graphene grain boundaries.Motivations and ObjectivesThe aim of this work is the development of an effective methodology for analyzing grain size and distribution in graphene as grown on copper by optical microscopy. In contrast to transmission electron microscopy3,4 and scanning tunneling microscopy3,5, this optical technique is not expensive and time-consuming and, above all, effective for the diagnostic on large scale. We also demonstrate the feasibility of this methodology for highlighting defect sites in graphene also depending post-growth processing such as transferring on other substrates.Results and DiscussionWe have optimized this diagnostic approach by using Raman spectroscopy to probe and confirm chemical and structural changes in graphene and copper substrate upon the wet treatment. Optical images of graphene on copper (a) and graphene on copper after Fenton reaction (b) show that graphene grain boundaries became clearly visible after wet oxidation treatment.

Autore Pugliese

• Bianco Giuseppe Valerio , Losurdo Maria , Giangregorio Maria Michela

Tutti gli autori

• A. Mameli; G.V. Bianco; M.M. Giangregorio; P. Capezzuto; M. Losurdo; G.Bruno

Titolo volume/Rivista

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Anno di pubblicazione

2013

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