Interfacial surface properties of thiol-protected gold nanoparticles: A molecular probe EPR approach

TY - JOUR

T1 - Interfacial surface properties of thiol-protected gold nanoparticles: A molecular probe EPR approach

AU - Khlestkin, Vadim K.

AU - Polienko, Julya F.

AU - Voinov, Maxim A.

AU - Smirnov, Alex I.

AU - Chechik, Victor

PY - 2008/2/5

Y1 - 2008/2/5

N2 - 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 An nanoparticles, we observed an increase in pK(a) of up to ca. 1.1 pH units that was affected by the position of the reporter moiety with respect to the monolayer interface.

AB - 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 An nanoparticles, we observed an increase in pK(a) of up to ca. 1.1 pH units that was affected by the position of the reporter moiety with respect to the monolayer interface.

KW - AQUEOUS MICELLAR SOLUTIONS

KW - ACID-BASE EQUILIBRIA

KW - SELF-ASSEMBLED MONOLAYERS

KW - LABELED AU NANOPARTICLES

KW - HIGH-FIELD EPR

KW - CLUSTERS

KW - INHIBITION

KW - EXCHANGE

KW - NANOTECHNOLOGY

KW - CHYMOTRYPSIN

UR - http://www.scopus.com/inward/record.url?scp=39449132105&partnerID=8YFLogxK

U2 - 10.1021/la702823n

DO - 10.1021/la702823n

M3 - Article

SN - 0743-7463

VL - 24

SP - 609

EP - 612

JO - Langmuir

JF - Langmuir

IS - 3

ER -