Interfacial surface properties of thiol-protected gold nanoparticles: a molecular probe EPR approach.
We present a molecular probe technique for accessing interfacial surface electrostatics of ligand-protected gold nanoparticles. A series of ligands with variable length of the hydrocarbon bridge between the anchoring sulfur and the reporting pH-sensitive nitroxide is described. The protonation state of this probe is directly observed by EPR spectroscopy. For tiopronin-protected Au nanoparticles, we observed an increase in pKa of up to ca. 1.1 pH units that was affected by the position of the reporter moiety with respect to the monolayer interface.
Khlestkin
Vadim K
VK
Novosibirsk Institute of Organic Chemistry, Novosibirsk 630090, Russia.
Polienko
Julya F
JF
Voinov
Maxim A
MA
Smirnov
Alex I
AI
Chechik
Victor
V