Controllable Laser Reduction of Graphene Oxide Films for Photoelectronic Applications

Abstract

This article presents a new simple method of creating light-absorbing carbon material for optical devices such as bolometers. A simple method of laser microstructuring of graphene oxide is used in order to create such material. The absorption values of more than 98% in the visible and more than 90% in the infrared range are achieved. Moreover thermal properties of the films, such as temperature dependence and the thermal response of the samples, are studied. The change in resistance with temperature is 13 Ohm K, temperature coefficient of resistance (TCR) is 0.3% K, and the sensitivity is 0.17 V W at 300 K. Thermal conductivity is rather high at ∼104 W m K at 300 K. The designed bolometer operates at room temperature using incandescent lamp as a light source. This technique suggests a new inexpensive way to create a selective absorption coating and/or active layer for optical devices. Developed GO and rGO films have a large surface area and high conductivity. These properties make carbon coatings a perfect candidate for creating a new type of optoelectronic devices (gas sensors, detectors of biological objects, etc.).

Atmospheric Dry Hydrogen Plasma Reduction of Inkjet‐Printed Flexible Graphene Oxide Electrodes

“…The degree of reduction may be evaluated by comparison of intensity between Da nd Gp eaks (I D /I G ). [65] The I D /I G ratio decreased from 1.2 to 0.9, which indicates considerable recoveryo ft he conjugated graphitic framework upon defunctionalization of carbon-oxygen functional groups. [66] Surface morphology AFM scans of untreated GO surfacesa nd hydrogen dry plasma-reduced GO surfaces are shown in Figure 4.…”

Customizing the reduction of individual graphene oxide flakes for precise work function tuning with meV precision

“…1e), in good agreement with the literature. 4,15,26 The peak positions remain mostly unchanged during the reduction, but the intensities decrease notably with increasing laser powers, with a slight drop in the intensity ratio between the D-mode and G-mode (Fig. 1f).…”

“…11,13 As GO is dispersible in water, aqueous GO solutions can be conveniently processed on a large-scale for industrial applications, e.g., through inkjet printing and spray coating, which then can be reduced to graphene-like lms, enabling a broad range of applications that otherwise are difficult to achieve with graphene (as it is hydrophobic), such as anti-electrostatic coating, corrosion-protection layers, and transparent conductors. [1][2][3][4][5][14][15][16][17] Apart from being the precursor of graphene, research on individual GO nanolms is immensely interesting in its own right. Through programmed laser irradiation, complex patterns can be structured on individual GO lms to develop transparent and exible electronics.…”

Flexible Polycaprolactone and Polycaprolactone/Graphene Scaffolds for Tissue Engineering

“…Polycaprolactone (Sigma Aldrich, St. Louis, MO, USA) with a molar mass of M n = 80 kDa was used for sample fabrication. GO was prepared from Timrex KS 15 graphite powder (Timcal Ltd, Bodio, Switzerland) as demonstrated in our earlier work [20,21]. Chimmed high purity acetone was used as a mutual solvent for the polymer and GO.…”