Graphene oxide layers modified by light energetic ions

Abstract

In this paper, the effect of light ion irradiation on graphene oxide foil structure and composition was studied. Due to the excellent properties of graphene based materials suitable for application in electronics, optoelectronics, micro-mechanics and space technologies, the interaction of energetic ions with graphene based structures is worth studying. From the fundamental point of view, it is also interesting to get information about graphene oxide structure modification and the possible functional properties after irradiation by energetic ions. The light ion irradiation of graphene oxide (GO) foil was performed using 2.5 MeV H and 5.1 MeV He ions. The change in the elemental composition of the GO foils after ion irradiation was investigated using Rutherford Backscattering Spectrometry and Elastic Recoil Detection Analysis. The influence of ion irradiation was further studied by microscopy methods. The chemical composition and structural changes of the GO foil surface were characterized by spectroscopy techniques including XPS, FTIR and Raman spectroscopy. Although the results of ion beam analysis indicated no significant compositional changes in the bulk of GO foils connected to ion irradiation, XPS, ATR-FTIR and Raman spectroscopy revealed reduction and removal of oxygen functionalities on the surface of graphene oxide. This reduction leads to a surface resistivity decrease after ion irradiation dependent on the ion species, fluence and energy.

Laser modification of graphene oxide layers

“…This finding is also in agreement with the XPS results, where only slight decrease of C-O bond and slight increase of C-C bond can be observed. The similar results, but with higher degree of GO reduction, can be observed after light (He, H) ion irradiation with MeV energy and fluencies up to ion fluence 1.0x10 14 cm -2 [17]. The ion irradiation with higher fluencies and heavy ions leads to the more pronounced sample amorphization and distortion of the sp 2 carbon bond angle, giving origin to non-six membered rings [30].…”

“…5 presence of the five different carbon bonding states; C=C (284.4) and C-C (285.4) in the sp 2 , C-O (286.3), C=O (288.0) in the carbonyl C and O-C=O (289.0) in the carboxylate C [9]. In the pristine GO foil dominates the C=C peak in sp 2 hybridized carbon, whereas the C-O peak that in GO commonly dominates is in the current sample reduced [17]. These indicate the significant degree of reduction of as-prepared GO foil that can be connected with warm drying during GO foil preparation.…”

“…The assembled membrane with GO layer was dried at 80 °C for 48 hours and subsequently the polycarbonate support was removed. The different degree of oxidation between the pristine GO foils used in the present experiment and pristine GO foils used in our previous work [17] originate from different method of graphene foil preparation and subsequent processing.…”

“…The used graphene oxide (GO) foils were prepared by graphite oxidation utilizing the permanganate oxidation method, as was reported elsewhere [17]. Briefly, the EPJ Web of Conferences 167, 04010 (2018) https://doi.org/10.1051/epjconf/201816704010 PPLA 2017 graphite (99.9995 %, Alfa Aesar) was subjected to oxidation under the action of potassium permanganate in sulfuric and phosphoric acid.…”

Graphite oxide based targets applied in laser matter interaction

“…In this study, fresh graphene oxide (GO) foil was synthesized like-Hummers method as reported in Ref. [13] to prepare GO thin foils. The evaluation of GO density was carried out by a Mettler Toledo MicroBalance with ± 1µg absolute accuracy in standard microbalance weighing technique.…”