Raman spectroscopy data related to the laser induced reduction of graphene oxide

This data paper reports data obtained from the fitting of Raman spectra obtained during a laser reduction process for graphene oxide under different processing and material conditions. In particular, we show examples of fitting curves of three different representative reduced graphene oxide spectra, as well as fitting curves for a graphene oxide spectrum. Moreover, we show and compare cumulative distributions of the ID/IG values (intensity ratio of peaks D and G) obtained from spectra acquired from different samples. Fittings and distributions were obtained using the OriginPro 8.5 software package. Such data may be the starting point of further experiments on the laser induced reduction of graphene oxide.


Data format
Raw Analyzed Parameters for data collection Each Raman spectrum was obtained acquiring a spectrum with the grating (1800/mm) centred at 1600 cm −1 and a spectrum with the grating centred at 2600 cm −1 . Each spectrum was obtained integrating 10 × 10 second acquisitions Description of data collection Samples were prepared in two different atmospheres (Argon and Argon containing 5% H 2 ). We used three different scan speeds (1.2, 2.7, 5.9 mm/s), two levels of material coverage (400 and 850 μg/cm 2 ) and a single or double laser pass. For each sample, 20 spectra were collected at random locations, the peaks were fitted using Lorentzian curves and the fitting parameters were statistically analysed.

Value of the Data
• Data presented provide an insight into the efficiency of graphene oxide laser induced reduction under different conditions. • Data presented should be of particular interest for researchers in the fields of laser modification of materials and laser synthesis of graphene. • Data presented may be a starting point for an investigation of laser reduction of graphene oxide under a much broader set of conditions.    peaks, attributed as in the figure labels, and the high wavenumber region can be fitted by two peaks, attributed as in the figure. The sum fitting line perfectly fits the spectrum. Fig. 2 provides an example of fitting of a Raman spectrum of RGO with a medium I D /I G ( ∼0.5). It can be observed that the low wavenumber region can be fitted by five lorentzian peaks, attributed as in the figure labels, and the high wavenumber region can be fitted by three peaks, attributed as in the figure. The sum fitting line perfectly fits the spectrum.    It can be observed that the low wavenumber region can be fitted by five lorentzian peaks, attributed as in the figure labels, and the high wavenumber region can be fitted by two peaks, attributed as in the figure. The sum fitting line perfectly fits the spectrum. Fig. 4 provides an example of fitting of a Raman spectrum of GO. It can be observed that the low wavenumber region can be fitted by four lorentzian peaks, attributed as in the figure labels, and the high wavenumber region can be fitted by two peaks, attributed as in the figure. The sum fitting line perfectly fits the spectrum. Fig. 5 shows a plot of the full width at half maximum for the D peak, obtained by fitting all our spectra, against the relative I D /I G ratio. The trend shows a monotone increase, taking into account the scattering of the data.  Raw data file: Spessore.opj This file contains raw data for Figs. 6 -7

Data Description
Raw data file: dati 2 pass.opj This file contains raw data for Fig. 8 Folder: Raman spectra Origin files containing the raw spectra and the relative fittings. Names are assigned as atmosphere_scan speed_material coverage (e.g. Ar_266_400). Where the number of passes was investigated, files are named as atmosphere_scan speed_material coverage_passes (e.g. Ar_266_400_2P)

Experimental Design, Materials and Methods
The starting graphene oxide material was purchased from Graphenea as a 0.4%wt water solution and drop-casted in fixed volumes (400 and 850 μl) onto 2 × 2 cm 2 polyethylene terephthalate (PET) substrates, after a 30-minute bath ultrasonication.
After drying under ambient conditions for two days, substrate were subjected to laser scribing under controlled atmosphere using a disposable glove box (AthmosBag) and a flow of Argon or a mixture of Argon (95%) and H 2 (5%).
Three different laser scribing scan speeds have been used: 5.9, 2.7 and 1.2 mm/s. Two different materials coverage, as can be inferred from above: 400 and 850 μg/cm 2 . Finally, a single and a double laser pass were investigated.
From each sample, 20 Raman spectra were collected and statistically analysed. From the fitting process we calculated the ID/IG value for each spectrum, and reported such values as cumulative distributions. According to textbook definitions, the value of the cumulative distribution at I D /I G = x is the number of occurrences in which I D /I G < x. This has been calculated by the origin software for each samples using a column of I D /I G as input values.

Ethics Statement
Not applicable.

Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships which have or could be perceived to have influenced the work reported in this article.