Synthesis and characterization of 2D-carbonylated graphitic carbon nitride: A promising organic semiconductor for miniaturized sensing devices

SARS-CoV-2 detection enabled by a portable and label-free photoelectrochemical genosensor using graphitic carbon nitride and gold nanoparticles

“…The signal difference of SPE/c-g-C3N4/GSH-AuNPs electrodes changed as the ssDNA concentration changed, whereas the signal difference for SPE/c-g-C3N4 through the concentration remained high, indicating that there was insufficient capture probe DNA 3A to hybridize the ssDNA 3A. The c-g-C3N4 has few carboxyl groups on its surface [68] , so there are few spots available to anchor the cpDNA and then to hybridize the ssDNA, which explains the same difference signal at different pattern concentrations in Figure 4 a. The use of GSH-AuNPs and PDDA helps to anchor the cpDNA due to the presence of carboxyl groups from glutathione, as shown in Figure 4 b, where the signal difference between the measure before and after the hybridization step increases as the ssDNA increases.…”

“…Thereby, all these mechanisms avoid the charge recombination between the valence and conduction band. The higher the concentration of [Ru(NH 3 ) 6 ]Cl 3 , the lower the recombination process [52] . Furthermore, the chronoamperograms from Figure 3 a, b and d show that the baseline remains stable and the photocurrent show good shape over time, which indicates good stability of the electrode during the photoelectroanalysis.…”

“…The synthesis of 2D-carbonylated graphitic carbon nitride ( c-g- C 3 N 4 ) was carried out according to the procedure reported by Cheng [29] with some adaptions [52] . The g-C 3 N 4 was initially produced by melamine polycondensation under thermal treatment in a closed porcelain crucible in an oven at 550°C for three hours, with a heat rate of 5°C min −1 .…”