Abstract
The adsorption characteristics of 1,4-phenylene diisocyanide (1,4-PDI) on colloidal Au particles have been investigated by means of various analytical techniques including infrared and Raman spectroscopy. Surface-enhanced infrared absorption spectroscopy as well as atomic force microscopy and quartz crystal microbalance clearly showed that 1,4-PDI should be adsorbed on gold via the carbon lone-pair electrons of one isocyanide group and that the pendent isocyanide group could react further with Au nanoparticles, suggesting that nanoarrayed electrodes could be fabricated using 1,4-PDI and Au nanoparticles. In the Au sol medium, the adsorption scheme was highly dependent on the concentration of 1,4-PDI. As a result, in the surface-enhanced Raman scattering (SERS) spectra, the relative peak intensity of the ν(NC)free and ν(NC)bound modes varied with a sigmoid shape with respect to the 1,4-PDI concentration. The inflection point (IP) seemed surprisingly to correspond to the monolayer-coverage limit. At lower c...
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