Boron-Doped Reduced Graphene Oxide with Tunable Bandgap and Enhanced Surface Plasmon Resonance

Abstract

Graphene and its hybrids are being employed as potential materials in light-sensing devices due to their high optical and electronic properties. However, the absence of a bandgap in graphene limits the realization of devices with high performance. In this work, a boron-doped reduced graphene oxide (B-rGO) is proposed to overcome the above problems. Boron doping enhances the conductivity of graphene oxide and creates several defect sites during the reduction process, which can play a vital role in achieving high-sensing performance of light-sensing devices. Initially, the B-rGO is synthesized using a modified microwave-assisted hydrothermal method and later analyzed using standard FESEM, FTIR, XPS, Raman, and XRD techniques. The content of boron in doped rGO was found to be 6.51 at.%. The B-rGO showed a tunable optical bandgap from 2.91 to 3.05 eV in the visible spectrum with an electrical conductivity of 0.816 S/cm. The optical constants obtained from UV-Vis absorption spectra suggested an enhanced surface plasmon resonance (SPR) response for B-rGO in the theoretical study, which was further verified by experimental investigations. The B-rGO with tunable bandgap and enhanced SPR could open up the solution for future high-performance optoelectronic and sensing applications.

Dependence of the Optical Constant Parameters of p-Toluene Sulfonic Acid-Doped Polyaniline and Its Composites on Dispersion Solvents

“…The surface morphology of the thin films of these materials was studied using Field Emission Scanning Electron Microscopy (FESEM) imagery, obtained using VPFESEM, Zeiss Supra55 VP (Oberkochen, Germany). The potential of the materials for surface plasmon resonance sensing application has been investigated through the estimation of the penetration depth of plasmon waves through a dielectric medium [ 11 , 12 ].…”

The Effects of Hydrophobicity and Textural Properties on Hexamethyldisiloxane Adsorption in Reduced Graphene Oxide Aerogels

“…Similarly, the characteristic band at 1040 cm −1 (C–O bending vibration) weakened in the order IGGO > rGOA-120 > rGOA-200, indicating partial cleavage of C–O bonds during the hydrothermal reduction. In addition, the intensities of the characteristic stretching vibrations at 1640 cm −1 (C=C group) for both rGOA samples were significantly increased [ 42 ], which is indicative of the restoration of the π-conjugation network of graphene following a hydrothermal reduction [ 43 ].…”

Investigation of L-Tryptophan Electrochemical Oxidation with a Graphene-Modified Electrode

“…In order to prove the presence of heteroatoms within the graphene sample, the FTIR spectrum ( Figure 4 a,b) was recorded and interpreted, in good agreement with the literature data. The vibration bands identified in the FTIR spectrum of the sample can be assigned as follows: the broad band at 3430 cm −1 is due to -OH and NH 2 stretching [ 31 , 32 ]; 2923 and 2853 cm −1 is assigned to asymmetric and symmetric stretching of -CH 2 [ 33 ]; 1744sh and 1709 cm −1 is assigned to Ar-COOH stretching and C=O stretching [ 29 , 34 ]; 1630 cm −1 is assigned to -NH 2 and aromatic C=C stretching; 1583 cm −1 is assigned to C=C and C=N stretching [ 31 ]; 1546sh cm −1 to C=C stretching [ 34 ], 1400 cm −1 to -COO − stretching; 1384 cm −1 to C ar -N stretching and -OH deformation [ 31 ].…”

“…The broad band between 1276–1135 cm −1 is due to the overlapping of -OH bending and C-O-C and B-C stretching; 1100–950 cm −1 , with maxima at 1055 cm −1 of -C-O and B-O-B stretching; 670–500 cm −1 , with maxima at 586 cm −1 of O-B-O stretching [ 31 , 32 , 34 ].…”