Highly sensitive and selective detection of trinitrotoluene using cysteine-capped gold nanoparticles

Abstract

(A) A schematic representation of the formation of cysteine capped gold nanoparticles and their interaction at pH 5 and 9.3. (B) A schematic representation of the formation of a Meisenheimer complex between cysteine modified gold nanoparticles and TNT, and possible cross-linking between gold nanoparticles bound to the Meisenheimer complex with gold nanoparticle bound cysteine.

Effect of Chemically Engineered Au/Ag Nanorods on the Optical and Mechanical Properties of Keratin Based Films

“…Furthermore, the ATR spectra of the film made with cysteine capped nanorods show additional bands related to the cysteine (Figure 8A) such the band at 1,590 cm −1 (C=O), 1,405 cm −1 (CH 2 and CH 3 bending), 1,298 and 1,339 cm −1 (C-O) (Devi et al, 2016). These bands are more intense for the KF-AuNRs cys than for the KF-Au@AgNRs cys , probably for a greater amount of nanorods on the surface of keratin based film.…”

Secondary Structure-Dependent Physicochemical Interaction of Oligonucleotides with Gold Nanorod and Photothermal Effect for Future Applications: A New Insight

“…The band is assigned to the C=O symmetric stretching. 29 − 31 The results indicate that unpaired DNA bases are interacting more closely with GNR surface, increasing symmetric stretching of C=O.…”

Integrated optical and electrochemical detection of Cu2+ ions in water using a sandwich amino acid–gold nanoparticle-based nano-biosensor consisting of a transparent-conductive platform

“…So that the SPR peak position is dependent on local refractive index and size and shape of gold nanoparticles. 24,25 As shown in the gure, at around the peak wavelength, the intensity of GNP/L-cys absorption is decreased in comparison with GNP absorption intensity. The results are compatible with those of other researchers.…”

“…The increasing of GNP/L-cys hydrodynamic size compared to the GNP average size is due to surface functionalization of GNPs with L-cysteine amino acid. 24,25 The zeta potentials of GNP and GNP/L-cys were À29.1 and À21.0 mV, respectively which caused by enough negative charge on the surface of nanoparticle and revealed the highly stability of the nanoparticles. 27 The Fig.…”

“…The results are compatible with those of other researchers. 20,24,25 The concentrations of the synthesized colloidal GNP and GNP/ L-cys solutions were calculated from UV-Vis spectra data and tabular material obtained by Haiss et al 26 As calculated, the gold nanoparticle contents in the nal GNP and GNP/L-cys solutions were 6.03 and 2.92 nM, respectively. Dynamic light scattering size distribution curve, size distribution histogram and zeta potential distribution of GNP and GNP/L-cys solutions are illustrated in Fig.…”