Laser-induced atomic assembling of periodic layered nanostructures of silver nanoparticles in fluoro-polymer film matrix

Abstract

Fluorinated acrylic polymer (FAP) films have been impregnated with silver precursor (Ag(hfac)COD) by supercritical fluid technique and next irradiated with laser (λ = 532 nm). Laser-chemically reduced Ag atoms have been assembled into massifs of Ag nanoparticles (3 -8 nm) in FAP/Ag(hfac)COD films matrix in the form of periodic layered nanostructures (horizontal to film surface) with unexpectedly short period (90 -180 nm). The wavelet analysis of TEM images reveals the existence of even shorter-period structures in such films. Photolysis with non-coherent light or pyrolysis of FAP/Ag(hfac)COD film results in formation of Ag nanoparticles massifs but free of any periodic nanoparticle assemblies. Our interpretation of the observed effect of laser formation of short-period nano-sized Ag nanoparticle assemblies is based on self-enhanced interference process in the course of modification of optical properties of film.

From Aggregates to Porous Three-Dimensional Scaffolds through a Mechanochemical Approach to Design Photosensitive Chitosan Derivatives

“…In contrast to Fourier transform, wavelets allow an optimal analysis of spatial fields with a complex multiscale structure [65]. To isolate the patterns of the spatial structure at different scales, the MHAT-wavelet (Mexican HAT) was set as the basic one [72]. Moreover, such an approach could explain the mechanisms for the destruction of implanted samples.…”

“…Initially, from the obtained image fragment, two one-dimensional rows were formed representing the spatial distributions of the averaged (along and across the visible surface of the chitosan film) pixel intensities. Subsequently, for each such row, a waveletgram and a spatial spectrum of structural non-uniformities were calculated [65,72].…”

Ag on carbon nanowalls mesostructures for SERS

“…to give additional enhancement of plasmon signal. Colloidal nanospheres 18 , polymers 19,20 , microstructured fibers 21 , etc. are addressed as the probable platform for this purpose.…”

Analysis of using femtosecond laser scanning system to impurity-induced disordering of InGaAsP quantum wells

“…In recent years, laser processing has become one of the most important tools for micro nano research, especially for femto second laser applications in the different technology fields [1][2][3][4], including semiconductor processing, solar photovoltaic, aerospace and military, laser abla tion [5][6][7], medical research [8][9][10][11], and other high precision technology development [12]. The femto second laser can achieve high precision machining at low temperature through photochemical machining, a two photon absorption mechanism, and a pulse fre quency (10 -15 ) that exceeds the thermal conductivity rate of the material (10 -12 ).…”