Variable Angle Spectroscopic Ellipsometry Characterization of Reduced Graphene Oxide Stabilized with Poly(Sodium 4-Styrenesulfonate)

Abstract

Lately, the optical properties of Graphene Oxide (GO) and Reduced Graphene Oxide (RGO) films have been studied in the ultraviolet and visible spectral range. However, the accurate optical properties in the extended near-infrared and mid-infrared range have not been published yet. In this work, we report a Variable Angle Spectroscopic Ellipsometry (VASE) characterization of GO thin films dip-coated on SiO2/Si substrates and thermally reduced GO films in the 0.38–4.1 eV photon energy range. Moreover, the optical properties of RGO stabilized with poly(sodium 4-styrenesulfonate) (PSS) films dip-coated on SiO2/Si substrates are studied in the same range for the first time. The Lorentz optical models fit well with the experimental data. In addition, the morphological properties of the samples were investigated by Scanning Electron Microscopy (SEM) analysis.

Variable-Angle Spectroscopic Ellipsometry of Graphene-Based Films

“…Additional details about the materials and the substrates discussed in this review can be found in Refs. [32][33][34][36][37][38][39].…”

“…We present a review of the authors' research works on Variable-Angle Spectroscopy (VASE) of graphene-based films [32][33][34][35][36][37][38][39].…”

Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

“…In recent years, optical fiber devices have been widely explored in the literature for hydrostatic pressure [13], lateral load [14], and strain [15,16] sensing. They have, therefore, general application as optical sensing devices; however, thin graphene oxide (GO) [17][18][19][20][21] films have gained acceptance in the development of several devices [22][23][24][25][26][27][28][29][30][31] and sensors [32][33][34][35][36][37][38][39][40]. Recently, it has been demonstrated that hollow microsphere fiberbased sensors, conforming to Fabry-Perot interferometers (FPI), can be used in sensing applications [41] by using GO as a tunable platform to enhance the spectral features of hollow microsphere FPI fiber sensor devices.…”

Graphene Oxide Coated Zinc Oxide Core–Shell Nanofibers for Enhanced Photocatalytic Performance and Durability

“…To date, several efforts have been made to restrain the photo-induced instability of ZnO-based composites. The most common way of solving photo/electrochemical instability of ZnO-based catalysts is coating them with carbon materials due to their excellent stability [9,18,19]. Fabrication of a ZnO-based photocatalyst with a combination of carbons including activated carbon, carbon nanotubes, and fullerene in a core@shell format can not only improve the rate of charge separation but also prevent photocorrosion [20][21][22].…”

“…Fabrication of a ZnO-based photocatalyst with a combination of carbons including activated carbon, carbon nanotubes, and fullerene in a core@shell format can not only improve the rate of charge separation but also prevent photocorrosion [20][21][22]. Graphene, a two-dimensional material, has been spotlighted as an application material in many fields due to its unique characteristics such as excellent charge carrier ability, high light transmittance, and large surface area [19,[23][24][25]. Therefore, it is an ideal candidate to couple with ZnO to obtain a composite with improved photocatalytic performance [26][27][28][29][30][31][32][33][34][35][36].…”