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Ratiometric Optical Sensing of Chloride Ions with Organic Fluorophore–Gold Nanoparticle Hybrids: A Systematic Study of Design Parameters and Surface Charge Effects
Author(s) -
Riedinger Andreas,
Zhang Feng,
Dommershausen Fabian,
Röcker Carlheinz,
Brandholt Stefan,
Nienhaus G. Ulrich,
Koert Ulrich,
Parak Wolfgang J.
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201000868
Subject(s) - fluorophore , nanoparticle , fluorescence , colloidal gold , surface charge , ion , chloride , materials science , spectroscopy , fluorescence spectroscopy , photochemistry , analytical chemistry (journal) , nanotechnology , inorganic chemistry , chemistry , optics , organic chemistry , physics , quantum mechanics , metallurgy
Colloidal nanoparticles are often stabilized by high surface charges. These create an electrical potential that may strongly affect the concentration of dissolved ions, which presents a formidable problem for the use of nanoparticles in ion‐sensing applications. This effect is investigated systematically with organic fluorophore–gold nanoparticle hybrids, which have a chloride‐sensitive fluorophore attached at varying distances from their surface. The distance‐dependent fluorescence response is quantitatively assessed using fluorescence spectroscopy.