Photophysical and Electrochemical Studies of Anchored Chromium (III) Complex on Reduced Graphene Oxide via Diazonium Chemistry

Abstract

Covalently anchored chromium complex on reduced graphene oxide (rGO‐Cr) is successfully synthesised through trimethoxy silyl propanamine (TMSPA) and phenyl azo salicylaldehyde (PAS) coupling. The rGO‐Cr is characterised by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), electron dispersive analysis of X‐rays (EDAX), Raman spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). Absorption and emission properties of rGO‐TMSPA‐PAS are studied by excitation dependent photoluminescence emissions at room temperature. Electrochemical sensing activity of rGO‐Cr is monitored for paracetamol using modified glassy carbon electrode. Cyclic voltammetry measurements indicated that rGO‐Cr substantially enhance the eletrochemical response of paracetamol. The experimental factors are investigated and optimized.

Experimental and Theoretical Investigation of 3‐[(2‐chlorophenyl)diazenyl]pyridine‐2,6‐diamine as Optical Limiter

“…The absorption and emission properties were screened to understand the switching nature of the molecule for a solution of 3024.3 M À 1 cm À 1 extinction coefficient. [27] Absorption and emission spectra of 1od are given in Figure 1(a) and (b). Table 1 illustrates the correlation between experimental and theoretical absorbance and emission spectra with their transitions.…”

Photoresponsive Carbon‐Azobenzene Hybrids: A Promising Material for Energy Devices

“…[50] Jose et al synthesized covalently anchored azo derivatives, which showed photoswitching property. [84] Finally, due to the disruption of the π-conjugated structure during the covalent reaction, the water solubility of hybrid materials generated using the covalent technique is reduced. While the process has advantages in terms of grafting density and half-lifetime, it is a viable way to create photo-switching-based energy materials.…”

“…Jose et al . synthesized covalently anchored azo derivatives, which showed photoswitching property [84] . Finally, due to the disruption of the π‐conjugated structure during the covalent reaction, the water solubility of hybrid materials generated using the covalent technique is reduced.…”

An electrochemical sensor for nanomolar detection of caffeine based on nicotinic acid hydrazide anchored on graphene oxide (NAHGO)

“…Graphene oxide (GO) has received much attention among carbon nanomaterials due to its high mechanical strength, thermal, and electrical conductivity 2 . Besides, the carboxyl, hydroxy, and epoxy groups create GO as a desirable platform for further functionalizing molecules 3 , 4 . Other than functionalization approaches of GO, heteroatom doping is also important since it modifies the properties of GO extensively.…”