Integration detection of mercury(ii) and GSH with a fluorescent “on-off-on” switch sensor based on nitrogen, sulfur co-doped carbon dots

Abstract

NS-CDs are employed as a sensitive sensor for the integration detection of Hg2+ and GSH. Hg2+ effectively quenching the fluorescence by static quenching. GSH is able to recover the fluorescence owing to the stronger binding between Hg2+ and GSH.

Influence of Nitrogen-Doped Carbon Quantum Dots on the Electrocatalytic Performance of the CoP Nanoflower Catalyst for OER

“…As shown in Figure S3a, the transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) image results show that NCQDs are uniformly distributed spherical carbon particles with a lattice spacing of 0.21 nm, corresponding to the (001) diffraction plane of sp 2 graphite carbon . The optical properties of NCQDs are studied, as shown in Figure S3b–d, UV–vis spectra peaks of NCQDs at 240 and 331 nm corresponding to the CC bond (π → π*) and CO/CN bond (n → π*), respectively. , The X-ray diffraction (XRD) profile of NCQDs shows an obvious wide peak at 22.6° (Figure S4a), corresponding to a graphite-like structure. , In addition, the composition and structure of NCQDs were further characterized and the Raman spectroscopy were studied (Figure S4b). Two obvious peaks corresponded to the typical D-band and G-band, and the I D / I G value is only 0.45, which suggests NCQDs have a high graphitization degree .…”

“…51,52 The X-ray diffraction (XRD) profile of NCQDs shows an obvious wide peak at 22.6°(Figure S4a), corresponding to a graphite-like structure. 53,54 In addition, the composition and structure of NCQDs were further characterized and the Raman spectroscopy were studied (Figure S4b). Two obvious peaks corresponded to the typical D-band and G-band, and the I D /I G value is only 0.45, which suggests NCQDs have a high graphitization degree.…”

A Continuously Tunable Full-Color Emission Nitrogen-Doped Carbon Dots and for Ultrasensitive and Highly Selective Detection of Ascorbic Acid

“…The HRTEM image of F-NCDs showed that the particles were approximately spherical (Figure 2a), with size distribution between 0.7~3.5 nm, and the average size of 2.0 nm (Figure 2b). The XRD spectrum of F-NCDs showed that there was an obvious diffraction peak around 23° (Figure 2c), which corresponded to the amorphous structure [21,22] . FTIR spectrum of F-NCDs displayed that a typical wide absorption band…”

Synthesis of N,Si co-doped carbon dots to establish a fluorescent sensor for Hg(ii) detection with triple signal output

“…According to previous studies, element doping can effectively improve the optical properties of CQDs in this aspect, 20,21 and the extraneous element in CQDs can also provide a stronger response to Hg(II) through the interaction of coordination/ complexation, photoinduced electron transfer (PET), ion binding or aggregation effects. [22][23][24][25][26][27] In this work, a new complex of carbon dots doped with nitrogen and silicon (N,Si/CQDs) was prepared from folic acid (FA) and N- [3-(trimethoxysily)propyl]-ethylenediamine (DAMO). FA molecule provides the functional groups of -NH 2 and -COOH, which are deemed as the efficacious components for Ndoping in CQDs to improve the quantum yield.…”