A high sensitive and selective fluorescent probe for dopamine detection based on water soluble AgInS2 quantum dots

Sequential, low-temperature aqueous synthesis of Ag–In–S/Zn quantum dots via staged cation exchange under biomineralization conditions

“…76 The specific optimum In/Ag ratio of ∼5, identified from among the compositions studied here, is in agreement with the corresponding literature-reported range for this maximum of In/Ag ∼ 1–9 ( i.e. , In/Ag ∼ 1, 77 1.7, 78 4, 15,34–36,72 5, 79,80 9 81 ). The wide variation of reported In/Ag optima is likely a manifestation of differences in synthesis conditions such as temperature, capping ligand, and synthesis medium.…”

“…3c), however, suggests that the changes with incubation are likely not dominated by a significant increase in Ag + exchange over the course of the extended incubation. 35,75,81 Rather, they are more likely due to effective low-temperature annealing of the particle structure as well as evolving surface passivation. 15,66,75…”

“…3b) increases with incubation time, similar to what has been shown in previous studies using alternative hydro/ solvothermal synthesis approaches. 35,75,81 As with the band gap, the PL QY increases most significantly (ca. 125%) for the In/Ag B 5 sample whereas the sensitivity of the In/Ag B 10 and 20 samples to extended incubation is much weaker.…”

Ternary Quantum Dots in Chemical Analysis. Synthesis and Detection Mechanisms

“…In the process, the AgInS 2 QDs are excited with photons to promote an electron to the conduction band. The QDs, as the donor, transfers the electron to the dopamine-quinone molecule, inducing a quenching of the emission signal [ 70 ].…”

Rational Confinement of Yttrium Vanadate within Three-Dimensional Graphene Aerogel: Electrochemical Analysis of Monoamine Neurotransmitter (Dopamine)

“…A monoamine neurotransmitter is a significant bioactive substance in the central nervous and cardiovascular system, which participates in various physiological activities. , Dopamine (DA) is a significant monoamine neurotransmitter in living systems’ biological functions. − The standard DA concentration in human blood and serum is in the range of 10 –6 –10 –9 mol/L . Unfortunately, the DA’s dysfunction concentration in biological fluids leads to many diseases such as Alzheimer’s, Parkinson’s disease, schizophrenia, attention deficit hyperactivity disorder, and dementia. − Hence, there has been an increasing interest in detecting DA levels as a basis for early-stage identification. At present, various approaches have been used for DA detection, including surface plasmonic resonance, spectrophotometry, capillary electrophoresis, electrochemical sensor, high-performance liquid chromatography-mass spectrometry, surface-enhanced Raman spectroscopy, and chemiluminescence. − Among them, useful techniques as noteworthy as the electrochemical sensor have proven ideal for real-time monitoring and point-of-care (POC) tests. − Currently, many types of working electrodes have been reported for the electrochemical sensor, such as carbon paste electrodes, glassy carbon electrodes, carbon fiber microelectrodes, gold electrodes, graphite–polyurethane composite electrodes, graphite electrodes, and carbon ionic liquid electrodes. − These electrodes are operated at laboratory conditions, which are hindering the realization of POC testing .…”