Journal of Nanoscience and Nanotechnology

Nanocomposites: synthesis, structure, properties and …

Modifying the Surface Properties of Superparamagnetic …

Silver nanoparticle aggregates were synthesized in large scale using resorcinol under alkaline condition to obtain an assembly of silver clusters. Stable dispersion of the cluster in aqueous medium has been examined out of resorcinol-capped silver nanoparticle assemblies. The UV−vis spectroscopy during the particle evolution has been studied in detail. From the high-resolution TEM (HRTEM) image and XRD pattern it was confirmed that the particles are made of pure silver only. The capping action of resorcinol has been authenticated from the FTIR spectra. UV−vis spectroscopy and TEM images reveal that the temperature, effect of vibrational energy, heat shock, and time-dependent particle evolution have unique bearing on the stability and surface properties of the clusters. The concentrations of silver nitrate, resorcinol, and NaOH have important influence on the particle evolution and its size. TEM images incite us to examine the aggregates to capitulate surface-enhanced Raman scattering (SERS) to the single molecular level using crystal violet (CV) and cresyl fast violet (CFV) as molecular probes. The SERS intensity of CV increases with increasing the size of the silver aggregate.

Self-Assembly of Silver Nanoparticles: Synthesis, Stabilization, Optical Properties, and Application in Surface-Enhanced Raman Scattering

Surface modification, functionalization and …

The syntheses of metal nanoparticles have taken a new route from the emergence of green chemistry. We propose the synthesis of silver nanoparticles through simple bio synthetic method. Metal nanoparticles prepared are characterized by TEM, UV-Vis and FTIR spectroscopy. TEM image show the nanoparticles are nearly spherical in shape with size about 40-50nm. UV-vis spectra show distinct peak of silver at around 427 nm corresponding to the surface plasmon peak of silver nanoparticles. The reduction in the surface plasmon peak of silver nanoparticles (Ag NPs) in addition to hydrogen peroxide at increasing concentrations supports our stand that it can be used as an optical sensor. Colorimetric detection of hydrogen peroxide is done with cellulose substrates.

Green Synthesis of Silver Nanoparticles Using Cosmos Sulphureus and Evaluation of Their Antimicrobial and Antioxidant Properties

One of the potential application of Ag NPs is the determination of hydrogen peroxide. Hydrogen peroxide has great relevance pertaining to environmental, pharmaceutical and clinical research [22-24]. Hydrogen peroxide is a very good oxidizing agent. In addition, hydrogen peroxide is a byproduct of number of enzymatic reaction involving glucose, cholesterol and lactate. However, higher concentration and amount of hydrogen peroxide can induce potentially serious disease in human body and can cause diseases such as cancer etc. The high concentration rates of hydrogen peroxide can lead to these problems. Thus a stable method for the sensing of different concentrations of hydrogen peroxide has to be developed. Many methods for the sensitive determination of hydrogen peroxide has been developed such as chemiluminescence, optical detection and electrochemical method. Of these, optical detection is found to be the best method as it is convenient and low cost. In the present manuscript, we synthesized silver nanoparticle by green route. The silver nanoparticle synthesized were characterized and coated on a cellulose substrate for optical detection of hydrogen peroxide.

04/08/2017 · Green Synthesis Of Silver Nanoparticles And Its Antibacterial Activity ..