Structural correlations with shifts in the extended plasma resonance of gold nanoparticle aggregates

One‐Pot Synthesis of Functional Helicoidal Hybrid Organic–Inorganic Nanofibers with Periodically Organized Mesoporosity

“…The position of the surfaceplasmon band completely agrees with the Mie theory and other experimental results found in the literature, [63][64][65][66][67][68][69][70] and shows a characteristic blue-shift behavior when the nanoparticles become smaller. Moreover, highly flexible nanocomposite membranes were prepared by dispersing up to 60% of Au@SiO 2 nanofibers characterized by different sizes of gold particles in polymer solution.…”

Thiol-modified gold nanoparticles deposited on silica support using dip coating

“…The plasmon resonance was reflected by the UV/vis spectrum by a broad absorption band in the visible region, centred around 520 nm. The position of this absorbance peak in the range of 500-550 nm is typical for the spherical gold nanoparticles with sizes less than 50 nm [21][22][23].…”

“…Moreover, the decrease of an intensity of the absorption band in the UV-vis spectrum of thiolated sample in comparison with nonthiolated one was observed due to Au S interaction. The second peak at 655 nm is most likely due to the structural changes during the formation of bonds between gold nanoparticles and thiol [23] and also changes in the particle distribution on the support (formation of the islets, see AFM results).…”

“…The first resonance peak is situated at 536 nm and it is derived from the collective plasmon oscillation among the closely packed particles. The red shift of SPR band reflects structural differences [23][24][25][26][27] and the changes in the electron clouds at the surface of the Au nanoparticles after modification with thiol (R-SH + Au → R-S − Au + Au (n−1) + ½ H 2 ). Moreover, the decrease of an intensity of the absorption band in the UV-vis spectrum of thiolated sample in comparison with nonthiolated one was observed due to Au S interaction.…”

Plasmonic Optical Properties and Applications of Metal Nanostructures

“…One example is the distinction between "coreshell" structures versus aggregates in the case of gold nanostructures from the reaction of HAuCl 4 and Na 2 S. [15,89] While the initial and several follow-up reports claimed Au 2 S-Au core-shell structure based primarily on spectroscopic data [90,91], more detailed studies based on a combination of spectroscopic, microscopy, and X-ray techniques have shown that the reaction product is mostly aggregates of gold nanoparticles. [15,33,92] This example shows that care must be exercised in structural determination that often requires a combination of techniques including high-resolution microscopy.…”