Aggregate Domain Growth of Gold Nanoparticle on Chemically Modified Glass Surface

Abstract

The aggregation of Au nanoparticle (AuNP) on a glass surface functionalized with 3-aminopropyltrimethoxysilane (APTMS) was studied by means of UV-vis spectroscopy and AFM measurements. The optical response of AuNP due to localized surface plasmon resonance (LSPR) was increased with the increment of AuNP amount on the functionalized glass surface, then the changes of spectral shape corresponds to the aggregate formation was finally observed. The AFM image shows in homogeneous aggregation of nanoparticles on the substrate surface. Three-dimensional aggregate growth was observed.

Combined experimental and simulation study of self-assembly of colloidal gold nanoparticles on silanized glass

“…This change is attributed to the effect of their size, concentration, interparticle spacing, interparticle coupling, and changes in the dielectric properties of the surrounding medium. [3][4][5][6][7] SPR-active substrates (fabricated by the deposition of Au or Ag NPs) could find different applications in materials chemistry, nanoelectronics, 8 optoelectronics, and chemical sensing. 9 The SPR features of Au and Ag monolayers can be exploited in using them as optical probes, 10 optical biosensors, 11 and substrates in surface enhanced Raman scattering (SERS) for molecular detection.…”

“…24,25 A high-quality self-assembled monolayer of Au nanostructures was achieved through the formation of covalent chemical bonding with the substrate. 3,22,26 Here, the substrate modification was accomplished by the use of organic linker molecules (organosilane) with amine or thiol functional groups. 5,22 It was also reported that a large-scale monolayer of Au NPs was formed at the air/water interface and then transferred to the solid substrate for different applications.…”