A convenient and sensitive colorimetric iodide assay based on directly inducing morphological transformation of gold nanostars.

ABSTRACT: We propose a convenient and easy colorimetric assay for highly sensitive detection of iodide by using gold nanostars (GNSs) as probes. The assay relies on that iodide directly changes the morphology of GNSs and alters their longitudinal localized surface plasmon resonance (LSPR) without surface modifications and the use of other reagents. Upon increasing iodide concentration, GNSs gradually transformed to sphere gold nanoparticles, the absorbance at longitudinal LSPR decreased, and solution color varied from greenish blue to red, as confirmed by the UV-Vis absorption spectroscopy and transmission electron microscopy. With this strategy, as low as 0.005 μM of iodide can be determined due to the specific properties of GNS with plenty of tips and corners and high surface-to-volume ratio. The

SUBMITTER: Zhou R 

PROVIDER: S-EPMC9261850 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature