Abstract
Direct observation and characterization of individual noble metal nanoparticles (MNPs) and their chemical reactions have attracted much attention owing to their unique physical and chemical properties and extensive applications. To achieve high-throughput information-rich evaluation of MNPs, it would be advantageous to combine highly efficient microcolumn separation technology with on-column high resolution plasmonic imaging technique. Here, with a chromatic aberration-suppressed supercontinuum laser light-sheet scattering imaging system and colorimetric detection, we monitored oxidation process of single gold nanorods inside a capillary under gravity driven flow, and observed heterogenous reaction intermediates and pathways for different MNP surface modifications. The results suggest that molecular interactions and bindings with MNPs have a significant impact on their reaction kinetics. This high-throughput on-line single particle detection technique could be potentially applied to chemical and biochemical reaction studies of other MNPs.
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