Investigation of laser wavelength effect on optical properties of graphene oxide colloidal nanostructures prepared by pulsed laser ablation

Abstract

In this work we prepared graphene oxide nanostructures (GONE) in a liquid environment using pulsed laser ablation technique. We used for the synthesis Nd: YAG pulsed laser operatating at 1064 nm and 532 nm of wavelength, we study the effect of wavelength of the laser on the optical properties of Nanostructures (NE) synthesized. The aim was determining the optical bandgap and the characteristic peak related by bond transitions using the absorbance UV-Vis spectra. Both samples show high absorption in the ultraviolet region in the UV-Vis spectra. Using Tauc’s plot method we compute the bandgap energy for GONEs assuming indirect bandgap. In addition, we observe characteristic peak formation 1 hour after synthesized NPs at 256 nm for NPs prepared at 1064 nm and for NPs prepared at 532 nm the peak with less intensity is observed at a wavelength of 218 nm. The characteristic peak for both samples increase of intensity 24 hours after preparation.

Graphene Nanostructures by Pulsed Laser Ablation in Liquids: A Review

“…The first band occurs in the range 260–270 nm which is assigned to the π–π* transition of C=C bond. The second band appears in the range 270–350 nm and corresponds to the n–π* transition of the C=O bond [ 63 , 67 ].…”

“…Graphene-oxide nanostructures have also been fabricated using a 1064 nm and 532 nm lasers. The laser irradiated a graphite target immersed in de-ionized water, and graphene-oxide nanoballs and nanowires were produced [ 67 ] ( Figure 30 ). Although the experimental conditions were similar to other works that reported the production of graphene nanosheets along with carbon nanostructures, this work [ 67 ] did not report the formation of nanosheets.…”

“…The laser irradiated a graphite target immersed in de-ionized water, and graphene-oxide nanoballs and nanowires were produced [ 67 ] ( Figure 30 ). Although the experimental conditions were similar to other works that reported the production of graphene nanosheets along with carbon nanostructures, this work [ 67 ] did not report the formation of nanosheets. Furthermore, no information on the lens used to focus the laser beam was given, hence, the fluence of the beam was not clear, which is an important factor in determining the final products in a PLAL process.…”

Study of the characterizationn of CdTe thin films prepared by the pulsed laser deposition technique with different laser energies

“…The pulsed laser deposition (PLD) technique, which has been widely developed recently, is used to obtain nanomaterials and nanostructures. Nanostructured materials have received great attention in recent years due to their properties that enable them to be applied in diverse fields, including electronics manufacturing, thin film preparation, and biology applications [15][16][17]. PLD can deposit thin films with intricate chemical compositions.…”