Ricardo Almeida de Matos

Federal University of São Paulo | UNIFESP · Departamento de Ciências Exatas e da Terra

The potential application of metallic nanoparticles had been attracting attention and interest from different areas of academia and industry. The nanoparticles properties and applications depend heavily on their dimension and shape, thus special interest is aimed to controlling the nanoparticles sizes. Ultrashort laser pulses are known to change me...

The synthesis of nanoparticles is usually carried out by chemical reduction, which is effective but uses many toxic substances, making the process potentially harmful to the environment. Hence, as part of the search for environmentally friendly or green synthetic methods, this study aimed to produce silver nanoparticles (AgNPs) using only AgNO3, Mi...

The synthesis of nanoparticles is generally carried out by chemical reduction, which is effective but uses a number of toxic substances, making the process potentially harmful to the environment. Thus, as part of the search for environmentally friendly or green synthetic methods, this chapter aimed to present the synthesis of gold nanoparticles (Au...

Metallic nanoparticles are important on several scientific, medical and industrial areas. The control of nanoparticles characteristics has fundamental importance to increase the efficiency on the processes and applications in which they are employed. The metallic nanoparticles present specific surface plasmon resonances (SPR). These resonances are...

In this study, 5-Aminolevulinic acid (ALA) gold nanoparticles (ALA:AuNPs) functionalized with polyethylene glycol (PEG) were synthetized and administered to rabbits to evaluate its use in clinical practice as theranostic agent for atherosclerosis. This was done by measuring the porphyrin fluorescence extracted for the rabbit’s blood and feces. An i...

A simple, environmentally friendly and cost-effective method was used to synthesize silver nanoparticles using tryptophan and light. To prepare the nanoparticles, the following components were used: deionized water, silver nitrate, light and tryptophan. The effects of the tryptophan concentration and light exposure time on the formation of tryptoph...

We report a method to synthetize silver nanoparticles using an agar–agar solution illuminated by light from a xenon lamp, followed by irradiation by ultrashort laser pulses. Spherical nanoparticles of ∽100 nm were created by the xenon lamp illumination, and after the ultrashort pulses irradiation their sizes were reduced to under 10 nm. Bideionized...

This study compares five amino acids (tryptophan, histidine, methionine, valine, threonine) for the spherical gold nanoparticles synthesis. Dieonized water, HAuCl4, amino acid and Xe light were used to represent a "green" alternative to traditional techniques.

We report a method to create gold nanoparticles of different sizes and shapes using agar–agar water solu-tion and irradiation with light from a xenon lamp, followed by ultrashort laser pulses. No additives, such as solvents, surfactants or reducing agents, were used in the procedure. Laser irradiation (laser ablation) was important to the reduc-tio...

A study of particles sizes and size dispersion was carry carried out, showing that nanoparticles characteristics can be controlled by shaping ultrashort pulses.

We report a simple method to create silver nanoparticles that consists in the irradiation of a silver nitrate and Euphorbia milii solution by light from a xenon lamp followed by ultrashort laser pulses. The formation of silver nanoparticles has been confirmed with UV–visible and TEM microscopy, and no additives, such as solvents, surfactants or red...