access icon free Raman spectroscopic image analysis on micropatterned graphene

© The Institution of Engineering and Technology
Received 20/03/2013, Accepted 01/05/2013, Revised 29/04/2013, Published

A study has been conducted on patterned graphene with widths in the range of 0.1–4 μm which was grown by chemical vapour deposition and patterned by electron beam lithography. The microscopic behaviour of the Raman spectrum was investigated using image mapping from Raman spectroscopic data. Among three main peaks (D-band, G-band and 2D-band), the two-dimensional (2D) peak was clear even in 200 nm width graphene, however the D-band signal was very weak, confirming low defect concentration. It was found that the 2D-band line width was decreased as the width became narrower, which was explained by refining the electronic band structure because of confined sample size. The 2D- and G-band intensities were decreased by reducing the width because the laser beam spot size was greater than the width of the sample and the effective area generating the signal was reduced.

Inspec keywords: spectral line intensity; spectral line breadth; chemical vapour deposition; band structure; graphene; electron beam lithography; Raman spectra

Other keywords: chemical vapour deposition; Raman spectrum; C; 2D peak; size 0.1 mum to 4 mum; confined size; microscopic behaviour; laser beam spot size; image mapping; 2D-band intensity; electronic band structure; D-band signal; Raman spectroscopic image analysis; G-band intensity; defect concentration; 2D-band line width; electron beam lithography; effective area generating signal; micropatterned graphene

Subjects: Electron states in low-dimensional structures; Optical properties of graphene and graphene related materials (thin films, low-dimensional and nanoscale structures); Structure of graphene and graphene-related materials; Infrared and Raman spectra in inorganic crystals; Chemical vapour deposition

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