Publication Type:

Journal Article


Langmuir, Volume 25, Number 3, p.1750-1756 (2009)



Carboxylic acid groups, Carboxylic acids, Charge transports, Cluster cores, Electric charge transports, electric conductivity, Electron energy levels, Gold, Gold clusters, Gold compounds, High temperatures, Hydrogen, Hydrogen bonds, Intramolecular hydrogen bondings, Low temperatures, Monolayer-protected clusters, Monolayers, Networked systems, Organic acids, Semiconductor behaviors, Semiconductor materials


N-(2-Mercaptopropionyl glycine)-passivated gold clusters (Au-MPG) represent a unique networked system of monolayer-protected clusters (MPCs) due to inter- and/or intramolecular hydrogen bonding between the MPC units thanks to the terminal carboxylic acid groups of the monolayers. We have investigated the size-dependent electric charge transport in well-dried thin films of Au-MPG MPCs by a four-probe methodology as a function of temperature. The MPCs display a novel behavior of metallic-like-to-semiconductor crossover with increase of temperature. The MPCs having average cluster core sizes of ̃1.6, ̃3, and ̃4 nm displayed a metallic-like nature (a linear increase of resistance of the films with increase of temperature) at low temperatures (̃20-60 K), which crosses over to semiconductor behavior (decrease of resistance with increase of temperature) at high temperatures. © 2009 American Chemical Society.


cited By 6

Cite this Research Publication

A. S. Nair and Kimura, K., “Charge transport behavior of N-(2-Mercaptopropionyl glycine)-protected Gold clusters with temperature”, Langmuir, vol. 25, pp. 1750-1756, 2009.