READ ME File For 'DATASET:  Laser-Induced Backward Transfer of Monolayer Graphene'

Dataset DOI: https://doi.org/10.5258/SOTON/D1502

ReadMe Author: Matthew Praeger, University of Southampton orcid.org/0000-0002-5814-6155

This dataset supports the publication:
AUTHORS:  Matthew Praeger, Symeon Papazoglou, Amaia Pesquera, Amaia Zurutuza, Adi Levi, Doron Naveh, Ioanna Zergioti, Robert W. Eason, Ben Mills
TITLE:  Laser-Induced Backward Transfer of Monolayer Graphene
JOURNAL:  Applied Surface Science
PAPER DOI IF KNOWN:


This dataset contains:
Figures, and where appropriate the underlying numerical data.


The figures are as follows:

Fig. 1  Schematic diagram providing an overview of the experiment configuration.

Fig. 2  Sequence of Illustrations showing the LIBT process. a) The set up before irradiation. b) During laser irradiation. c) Shows the flyer of 2D material during transfer (note that the transfer direction is opposite to the laser propagation direction). d) The situation after LIBT with the 2D material deposited onto the under-side of the receiver.

Fig. 3  Illustration of the concept of spatial dithering, showing how a DMD with binary (on or off) states can achieve grayscale intensity control. a) Example DMD image with spatial dithering to achieve higher intensity from the perimeter ring (8-bit grey level of 255, i.e. full intensity) than from the central spot (average grey level of 224, i.e. 88 % intensity). b) Magnified view showing the binary values for individual micro-mirrors. c) Measured intensity profile of white light that has been spatially modulated by reflection from the DMD (see supplemental data for more information).

Fig. 4  a) Cutaway diagram of the miniature vacuum chamber (based on CF DN40 flanges) showing the spring mechanism that holds the donor and receiver in contact. The inset b) shows a photograph of the vacuum chamber.

Fig. 5  Image plot of laser intensity within the carrier (Ni) as a function of depth below the surface (vertical axis) and time (horizontal axis).

Fig. 6  Image plot showing the calculated temperature profile in the Ni carrier as a function of penetration depth (vertical axis) and time (horizontal axis) when subjected to a 190 fs pulse with fluence of 30 mJ/cm2.

Fig. 7  a) Surface displacement, b) velocity and c) acceleration calculated for a Ni carrier as a function of time when subjected to a 190 fs pulse with fluence of 30 mJ/cm2.

Fig. 8  a) Optical microscope image showing a laser-irradiated region of the donor. Image contrast has been enhanced in order to show the laser-induced change in appearance. The red dotted line is a guide for the eye showing the perimeter of the laser-irradiated region. b) Optical microscope images of the donor taken using the micro-Raman system, the red dotted circles indicate positions subjected to low fluence laser irradiation. The green spots at G and L indicate the positions of the Raman measurements. c) Raman spectra, upper line (blue) was recorded at position G and show peaks associated with monolayer graphene, the lower line (yellow) corresponds to the laser-irradiated region at position L where the graphene peaks are absent.

Fig. 9  a) and b) Optical microscope observations of the receiver (with enhanced contrast) showing the location of Raman measurements (position 020 and 021 respectively). c) Representative Raman spectra for fragments of graphene transferred via LIBT to a fused silica receiver. Upper (blue) line corresponds to position 020 shown in a) and lower (yellow) line is for position 021 shown in b).

Fig. 10  SEM images of graphene fragments transferred onto the fused silica receiver by LIBT at atmospheric pressure. a) and b) are at the same magnification and show examples of the resultant deposition when the laser irradiates a circular region, 30 µm in diameter. c) Is at lower magnification and shows the context of the region featured in b).

Fig. 11  Optical microscope images of a) the Ni donor showing removal of graphene and b) the receiver showing intact transfer of the graphene. The blue dotted curves have been added as a guide for the eye, to help identify the circular region.

Fig. 12  a) SEM image of graphene transferred to the receiver substrate (the same location as shown in Fig. 11. b)). b) At higher fluence (130 mJ/cm2) material in spherical beads is deposited, likely to be Ni that was molten during transfer.

Fig. 13  a) Optical microscope image of graphene transferred to the receiver (same data as Fig. 11. b), contrast enhanced and converted to monochrome to show colour markers indicating the approximate locations of Raman measurements). b) Raman spectra recorded at multiple positions across the transferred graphene spot (blue text labels indicate the peak assignment).


Date of data collection: 2019/01/01 - 2020/08/01

Licence: CC-BY

Related projects:
Laser EnAbled TransFer of 2D Materials (LEAF-2D)
EU H2020 - Grant agreement ID: 801389 


Date that the file was created: 08/2020