Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 33, Pages 18254-18262Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b05355
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Funding
- Region Ile-de-France
- Campus France Agency as part of the Tassili agreement program
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The surface characterization of branched and spherical gold nanoparticles was done by two complementary techniques: scattering correlation spectroscopy (SCS) and surface-enhanced Raman spectroscopy (SERS). Thiophenol was used as a surface marker to probe the surface area and the gold-thiophenol interaction in gold nanourchins (GNUS) and gold nanospheres (GNSs). We observed that, for GNU, the thiophenol is first grafted on the core, with a saturation concentration of about 10(-3) M as observed for GNSs. Afterward, the saturation of the branches occurs at a higher thiophenol concentration (similar to 1 M). A numerical calculation of the surface areas of GNSs of different sizes allowed for the estimation of the GNU surface area. The hydrodynamic radius was measured at different steps of thiophenol-GNP functionalization. By comparing spherical and nonspherical nanoparticles, we demonstrate that the molecule-GNP interaction is highly dependent on the nanoparticle morphology (size and shape).
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