In situ synthesis of gold nanoclusters in hydrogels for the capillary based portable fluorescence analysis of hypochlorite in environmental samples

Abstract

Bovine serum albumin (BSA) reduces HAuCl4 under alkaline conditions to achieve rapid in-situ growth of gold nanoclusters (Au NCs) in hydrogels. The hydrogels doped with BSA and HAuCl4 not only...

In Situ Grown Gold Nanoparticles Enable Plasmonic Staining of Bacteria for High-Performance On-Site Microbial Analysis in Drinking Water

“…Preventing the water pollutant is an important global necessity, − and among the pollutants, bacteria are seriously harmful to our health. − The rapid and sensitive monitoring of microbes in water sources is highly essential for ensuring food and environmental safety. , Even a great deal of bacterium analysis methods have been developed on the basis of bacteria incubation, , polymerase chain reactions, − enzyme linked immunosorbent assay, which were widely used in professional laboratories, − the ideal emergency bacterium monitoring routes, especially those strategies for on-site applications, are still deficient due to the shortcoming of low accuracy and sensitivity. To substantially facilitate the practicality of on-site bacterium monitoring technique, novel analytical strategies should perform with high anti-interference capacity, high stabilities, and target enriching roles. − Additionally, those intriguing characteristics of simplicity, speediness, and low costs should be further integrated into the developing analytical strategies for the effective conversion of fundamental research to commercial uses …”

Mercury-Mediated Epitaxial Accumulation of Au Atoms for Stained Hydrogel-Improved On-Site Mercury Monitoring

“…Foremost, the reticular skeleton structure of the hydrogel is effective in rapidly stablilizing Au NPs, avoiding the nonspecific aggregation phenomenon in complex environments and biological samples. Nevertheless, in that route, cysteine molecules were preadded in the hydrogels, which served as the initial reductant reagents for the reduction of trivalent Au ions. , During the tests, cysteine as the small molecules involuntarily permeated inside the hydrogels or diffused to the solution, which weakened the reaction stabilities and sensing performance. The doping of active supermolecules (e.g., carbon nanodots, CDs), rather than cysteine, might be considered to address the diffusion issue for improved hydrogel-based analysis methods.…”