Journal of Electroanalytical Chemistry, Vol.688, 349-353, 2013
Electrochemical impedance spectroscopic measurement of potential of zero charge of octanethiolate-protected Au and Pd nanoparticles
Electrochemical impedance spectroscopic (EIS) method was used to determine potential of zero charge (PZC) of octanethiolate-protected Au and Pd nanoparticles (NPs) of about 2-nm and 3-nm sizes respectively. The PZC values so obtained were compared with those obtained by the more conventional differential pulse voltammetry (DPV)/z-plot method. Good agreements were found between the PZC values obtained by these two very different methods, attesting the validity of the EIS-based method whose applicability is not limited by the NP size and is therefore expected to have broader implications in terms of measuring PZC of metal NPs. (C) 2012 Elsevier B.V. All rights reserved.
Keywords:Electrochemical impedance spectroscopy;Ligand-protected metal nanoparticles;Potential of zero charge;Differential pulse voltammetry