Formation of silver microbelt structures by laser irradiation of silver nanoparticles in ethanol

Abstract

In the present work, we prepared silver nanoparticles by laser ablation of pure silver plate in ethanol and then irradiated the silver nanoparticles using a 532 nm Q-switched Nd:YAG pulsed laser. Transmission electron microscopic images of the sample after irradiation clearly showed formation of big structures, such as microrods and microbelts in ethanol. The obtained microbelts had a width of about 0.166 μm and a length of 1.472 μm. The reason for the formation of such a big structure is the tendency of the nanoparticles to aggregate in ethanol before irradiation, which causes fusion of the nanoparticles.

Simultaneous Photodynamic and Photothermal Therapy Using Photosensitizer-Functionalized Pd Nanosheets by Single Continuous Wave Laser

“…However, the serious photobleaching of indocyanine green molecules under laser irradiation limits their wide applications. Although gold nanostructures are the most studied agents for the near-infrared (NIR) PTT, many anisotropic and hollow Au nanostructures lack of good photothermal stability upon irradiation of NIR laser, thereby inevitably imposing limitations in their practical therapeutic applications. ,− In comparison, the Pd-based species including Pd and Pd@Ag nanosheets et al, are new kind of promising photothermal agents because of their strong absorption in the near-infrared region, high photothermal conversion efficiency, excellent photothermal stability and biocompatibility. ,, More importantly, by changing the synthesis condition, a series of different sizes of Pd nanosheets with tunable NIR maximum absorption can be prepared. Recently, our group also has prepared ultrasmall Pd (palladium) nanosheets with the average diameter of ∼4.4 nm.…”

Mesoscopic magnetic iron oxide spheres for high performance Li-ion battery anode: a new pulsed laser induced reactive micro-bubble synthesis process

“…63,64 Because of the Brownian motion of the particles in the solution, the particles attract each other and become aggregated because of weak repulsive forces and attractive dipole-dipole interactions (hydrodynamic forces) leading to an increase in the particle size. 65 In this case the conversion of a-Fe 2 O 3 to Fe 3 O 4 occurs through a photofusion process as the particle size grows bigger and becomes spherical in nature because of the minimum surface energy.…”

Two-dimensional Pd-based nanomaterials for bioapplications

“…Despite intense research interest in using these nanomaterials for PTT, several challenges still remain. For instance, the difficulty in adjusting the shape and size of NIR-absorbing nanomaterials makes systematical investigation of their bio-behaviors impossible and thus limits their clinical applications [33,43]. Therefore, the development of NIR photothermal agents with well-defined morphologies and sizes, as well as good photothermal properties for cancer therapy, has aroused great research interest.…”