title: Direct visualization of lead corona and its nanomolar colorimetric detection using anisotropic gold nanoparticles.
abstract: The study presents dithiothreitol (DTT) functionalized anisotropic gold nanoparticles (GNP) based colorimetric sensor for detection of toxic lead ions in water. Our results demonstrate the selectivity and sensitivity of the developed sensor over various heavy metal ions with detection limit of ∼9 nM. The mechanism of sensing is explained on the basis of unique corona formation around the DTT functionalized anisotropic GNP.
authors.affiliation: School of Basic Sciences, Indian Institute of Technology Mandi , Mandi-175001, India.
authors.forename: Charu
authors.initials: C
authors.lastname: Dwivedi
authors.forename: Abhishek
authors.initials: A
authors.lastname: Chaudhary
authors.forename: Abhishek
authors.initials: A
authors.lastname: Gupta
authors.forename: Chayan K
authors.initials: CK
authors.lastname: Nandi
mesh_terms: D003124:Colorimetry; D004229:Dithiothreitol / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007854:Lead / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D019216:Metals, Heavy / Q000032:analysis; D014867:Water / Q000737:chemistry
chemical_list: D007477:Ions; D019216:Metals, Heavy; D014867:Water; D007854:Lead; D006046:Gold; D004229:Dithiothreitol
keywords: anisotropy; colorimetric assay; corona formation; gold nanoparticles; lead ions