One-pot green preparation of deep-ultraviolet and dual-emission carbon nanodots for dual-channel ratiometric determination of polyphenol in tea sample

An eco-friendly fluorometric assay for high-sensitive meloxicam quantitation in biological matrices

“…22 The three peaks observed at 2968, 2771, and 518 cm −1 can be assigned to the C–H stretching mode and out-of-plane bending mode, 21 as well as the C–N/C–O bending at 1095 cm −1 . 23,27 These results indicate that the N atoms from guanidine were incorporated into the nano-Cdots completely, forming a structurally rigid framework during the reaction process.…”

“…The N 1s spectrum (Fig. 2D) showed three peaks around 398.6, 399.7, and 400.1 eV, which are attributed to N atoms in a graphite-like structure, pyridinic/pyrrolic-type N, and N–H groups, 23 respectively. These results are consistent with the FT-IR results.…”

“…16–18 Owing to their lower toxicity, good biocompatibility, and high photostability, we have designed and prepared many CNMs with different physicochemical properties to detect a variety of analytes. 19–25 Inspired by the lack of low toxicity or even non-toxic Mel probes, herein, we develop a simple and eco-friendly synthetic approach toward water-soluble luminescent nano-carbon dots (nano-Cdots) by a one-pot eco-friendly hydrothermal process involving carbon–nitrogen precursors. The entire synthesis process does not involve any toxic reagents.…”

On‐site rapid detection of Listeria monocytogenes in dairy products using smartphone‐integrated device‐assisted ratiometric fluorescent sensors

“…In XPS research (Figure 1b), the CDs displayed characteristic peaks at 284.77, 401.08 and 531.66 eV by representing elements C (45.13 At %), N (41.39 At %) and O (13.48 At %), respectively, which were consistent with the previous report (Wang et al . 2022). Importantly, it was found that element oxygen involved in the process of synthesising CDs with H 2 O, while generating the loss of nitrogen atoms compared to whole guanidine hydrochloride as verification before (Wang et al .…”

“…The CDs were prepared from single materials guanidine hydrochloride by a one pot reaction (Wang et al . 2022). Briefly, 12 mg of guanidine hydrochloride was dissolved in 2 mL of purified water until dissolved entirely.…”