Plasmon sensing and enhancement of laser prepared silver colloidal nanoplates

Spherical Ag particles are converted into flat triangular nanoplates sized around 100 nm and thick about 10-20 nm.

“Indeed, spherical particles are converted into flat triangular ones, sized around 100 nm and thick about 10–20 nm, as shown by scanning electron microscopy images and atomic force microscopy profiles in Figure 15c,d.”

When spherical Ag NPs are irradiated with white light in association with H2O2 addition, a dramatic spectral change occurs, with formation of two main features: one red-shifted to ~600 nm (longitudinal in-plane dipole mode) and another out-of-plane quadrupole mode at 335 nm.

“When such particles are irradiated with white light, in association with H2O2 addition, a dramatic spectral change occurs, with the formation of two main features [156]. One feature is red-shifted to ~600 nm and represents the longitudinal in-plane dipole mode [157]. The other important feature, despite its low intensity, is the out-of-plane quadrupole mode, at 335 nm, which is an indication of An”

Using LAL for production of seeds, coupled with light irradiation and H2O2 addition, is an environment-friendly process that does not involve strong reducing agents or harmful chemicals.

“However, the use of LAL for the production of the seeds, coupled with light irradiation and H2O2 addition, has the great advantage of being an environment-friendly process that does not involve the use of strong reducing agents or harmful chemicals [156,161,162].”

Spherical Ag NPs with a single plasmon resonance feature at 393 nm, indicating particles around 10 nm, were obtained by LAL in water with citrate as capping agent using a 1064 Nd:YAG-pulsed laser.

“These show a single plasmon resonance feature at 393 nm, indicating particles in the region of 10 nm, as can also be observed by SEM in Figure 15b.”