Biocompatible sulfur nitrogen co-doped carbon quantum dots for highly sensitive and selective detection of dopamine

Fluorescent filter paper with pH-responsive carbon dots for the on-site detection of biogenic amines in food

“…2d, the two binding energies of N 1s were attributed to N–H (399.89 eV) and C–N–C/C–N (399.17 eV). 32 Besides this, the high-resolution spectrum of O 1s (Fig. 2e) could be divided into three peaks at 530.81 eV, 532.21 eV, and 534.95 eV, which could be assigned to CO, C–O, and –OH, respectively.…”

“…2f, the three peaks at 168.52 eV, 164.26 eV, and 163.06 eV were assigned to S2p,sat, C–S, S2p 1/2 , and S2p 3/2 , respectively. 32…”

Fe-doped carbonized polymer dot-based fluorescent sensor with “turn-on” property for hydrazine hydrate detection

“…S6†) showed a broad diffraction peak at 20.27°, which was consistent with the (100) lattice spacing of carbon-based materials. 38 We studied the changes of UV absorbance before and after the addition of hydrazine hydrate to the CPDs, which is generally used for the determination of trace iron content by spectrophotometric methods with o -phenanthroline (also known as o -diazofi), which only complexes with Fe 2+ and has a maximum absorbance at 510 nm. 39 In Fig.…”

Mn3+/Mn4+ ion-doped carbon dots as fenton-like catalysts for fluorescence dual-signal detection of dopamine

“…Up to now, the research on brain science has become more and more attractive in elucidating the structure and function of the human brain, as well as human behavior and mental activity, which involves enhancing human neural activity and improving the level of prevention, diagnosis, and treatment services for nervous system diseases ( Poo and Tan, 2016 ). Dopamine (DA), a neurotransmitter, plays a crucial role in mood, sleep, memory, endocrine regulation, and movement ( He et al, 2020 ; Wang et al, 2021 ). The level of DA in the brain of healthy people ranges from 1.3 to 2.6 μmol, and abnormal DA levels often lead to various diseases, including anorexia, epilepsy, Alzheimer’s disease, schizophrenia, and attention deficit dysfunction ( Chen and Zhou, 2015 ; He et al, 2018 ).…”