DOI: 10.1039/d6ra04711d ISSN: 2046-2069
Optimization of gold nanoparticles conjugated with four thiol-based ligands for the colorimetric detection of cadmium ions in water samples
Febrina Amelia Saputri, Shania Felisia, Diana Andara Prastika, Callista Andinie Mulyadi, Raditya Iswandana, Zahra Khoshbin, Vinayak A. Dhumale, Ravi Kant ChoubeyCd 2+ bridges the carboxylate (MNA) and amino (Ala) groups on AuNP surfaces, cross-linking adjacent particles. This shortens interparticle distance, red-shifting and broadening the SPR band, giving a red-to-blue/purple colorimetric change.