Tiopronin protected gold-silver bimetallic nanoclusters for sequential detection of Fe3+ and ascorbic acid in serum

Nitrogen-doped carbon quantum dots for fluorescence sensing, anti-counterfeiting and logic gate operations

“…Previous works have demonstrated that Fe 3+ can be reduced to Fe 2+ in the presence of AA, 10,41 on the basis of which a ''turnon'' chemosensor platform has been constructed for determining AA. As shown in Fig.…”

“…Currently, various technologies are established for the determination of Fe 3+ and AA, such as electrochemical methods, colorimetry, chromatography, and fluorescence spectroscopy. 9,10 Among these methods, fluorescence detection technology has attracted more and more attention due to its high sensitivity, selectivity, and ability to overcome the shortcomings of sophisticated equipment, complicated processes, high costs, and timeconsuming procedures. 11 Fluorescent chemosensors utilize fluorescent molecules to undergo specific interactions with target analytes, resulting in changes in their fluorescence properties.…”

A Ratiometric Fluorescent Sensor for Penicillin G Based on Color-Tunable Gold–Silver Nanoclusters

“…Various methods, including high-performance liquid chromatography and liquid chromatography–mass spectrometry, have been developed for the detection of penicillin G − as well as immunoassay methods. , However, these methods are very complicated, expensive, and time-consuming . Meanwhile, ratiometric fluorescence sensing, which is based on measuring the relative fluorescence intensities ratio at two emission wavelengths, is being increasingly applied for the analysis of the natural environment and living systems. − In particular, precious-metal fluorescent nanoclusters have received extensive research attention as ratiometric fluorescence sensors in the past few years due to their excellent optical properties and biocompatibility. − In contrast to single-signal detection, this method has built-in corrections for fluctuations in instrument operation, interference from the sample matrix, variations in the microenvironment around the probe, and changes in the concentration of the probe . Recently, biomass-derived materials have been used as protective and reducing agents for the design of nanomaterials with special optical properties, more biocompatibility, and less environmental influence. − For instance, 6-aza-2-thiothymine (ATT) containing both amino and imino groups endows the corresponding nanoclusters with good biocompatibility .…”

Chameleon-like Response Mechanism of Gold–Silver Bimetallic Nanoclusters Stimulated by Sulfur Ions and Their Application in Visual Fluorescence Sensing

“…Long-term exposure to air containing low concentrations of H 2 S may cause eye irritation symptoms. 8 A high H 2 S concentration can cause pulmonary edema, headache, dizziness, nausea, and vomiting. 9 If a large amount of H 2 S is inhaled in a short period of time, people will soon suffer from acute poisoning, respiratory paralysis, and even death.…”