Coverage and aggregation of gold nanoparticles on silanized glasses

ALBERTO F. SCARPETTINI; ANDREA V. BRAGAS

LANGMUIR

AMER CHEMICAL SOC

Año: 2010 vol. 26 p. 15948 - 15953

0743-7463

We study the dynamics of the coverage and aggregation of gold nanoparticles over organosilanized glass substratesfor different sizes of nanoparticles. We present measurements of extinction spectra and nanoparticle counting statisticsand demonstrate that both methods are equivalent describing those processes. We introduce models that describe thementioned dynamics, which are characterized by an exponential-like function with two relevant parameters: asaturation value and a characteristic time. The electrostatic repulsion plays a significant role in both processes. Theaggregation is dominated by the mobility of the isolated nanoparticles, which first join in dimers and, further in time, inclusters of higher number of nanoparticles.