Abstract
Laser scribing, by far proposed as a method for efficiently transforming graphene oxide into reduced graphene, has been employed, using a CW laser beam, to study the modifications of graphene oxide scribed under different controlled atmospheres, including air, N2, Ar, and a 95 : 5 (v/v) Ar/H2 mixture. We have found that laser scribing effects, including chemical composition, order degree, and electrical properties, strongly depend upon the atmosphere during the irradiation. The electrical properties of the various materials, obtained in different atmospheres, have been evaluated with respect to the sensing properties towards humidity, the materials produced in pure Argon yielding the highest sensitivity and the fastest response, while related Raman microspectroscopy measurements showed that both Ar and Ar-H2 mixture produce the highest order among the various samples. The results stress the importance and the potentialities of controlling the irradiation atmosphere in order to tune the composition and electrical properties of the laser-scribed graphene oxide materials.
Highlights
Since its discovery, graphene has found manifold potential applications due to its remarkable electronic, optical, chemical, and mechanical properties
Four different atmospheres have been used to carry out the scribing procedure: air, Nitrogen, Argon, and a 95 : 5 Argon/H2 mixture
Based on the values obtained, we found that the samples prepared in Argon is the most responsive to moisture, while the one prepared in air is the least responsive
Summary
Graphene has found manifold potential applications due to its remarkable electronic, optical, chemical, and mechanical properties. Graphene monolayers can be exfoliated and isolated in water but necessitate the aid of surfactant molecules or polymers to overcome reaggregation due to the strong van der Waals interaction between layers coming from π − π stacking [3]. One way to dissolve graphene in water without using surfactants or molecules is oxidation. As the original structure is modified, the process yields a different material, with different properties, which has been named graphene oxide (GO) [4, 5]. This can be reduced back in order to partially restore the original properties once the material has been processed [6]. The structure is never fully restored; such material has been named reduced GO (rGO), to distinguish from the pristine graphene
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