The NCs were synthesized by using L-tryptophan (L-Trp) as the template to react with tetrachloroauric acid and silver nitrate at 120 ☌ for 4 h in a one-pot reaction. New bimetallic gold/silver nanoclusters (NCs) are reported that display strong blue fluorescence with excitation/emission maxima at 370/455 nm, decay times of around 14 ns for the main components, and a quantum yield of around 20%. #CAPILLARY MICROSPHERES CORE SHELL PORTABLE#Given electrostatic force and capillary action, this developed portable SERS-enabled device holds great potential for practical applications in point-of-care (POC) diagnosis. Based on the inherent SERS spectra of MTA and 4-MBA, the intensity ratio of MTA and 4-MBA versus the concentration of MTA shows a correlation coefficient of 0.990 in the range of 0.1 nM–110 nM. The fabricated capillaries allow rapid detection of MTA via a facile “aspiration-measure” detection mode. The CSSM-modified glass capillaries exhibit strong enrichment of MTA due to electrostatic interaction, high SERS performance ascribed to the interparticle plasmonic coupling, and the stimulation of strong signal of 4-MBA, enabling the detection of MTA molecules at low concentrations. The quality of the prepared capillaries was facilely evaluated and controlled by detecting SERS signals of 4-mercaptobenzoic acid (4-MBA) that were specifically anchored in the middle gap of CSSM. By employing a facile mirror reaction and a self-assembly procedure, glass capillaries were compactly coated with core-shell-satellite microspheres (CSSM) via a batch-fabrication process without using any pre-surface modifications or specialized equipment.
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