Synthesis Of Silver Nanorods Research Articles

Development of nano-silver alkaline protease bio-conjugate depilating eco-benign formulation by utilizing potato peel based medium

A new bio-conjugate nano-silver enzyme conjugate complex (BC-nAg-Akp) was formulated containing alkaline protease (Akp). The present research involved synthesis of nAg particles in acetone concentrated enzyme sol using 0.005 M AgNO3 solution formed within interaction time of 24 h through photo catalysis. The BC-nAG-Akp composite exhibited 1.9-fold increase in enzyme activity. The formulation was characterized using techniques viz., SEM, SEM-EDS, TEM, and DLS spectroscopy. The TEM analysis revealed synthesis of silver nano rods with size dimensions ranging from 40 to 80 nm. Likewise, the mean hydrodynamic diameter was 114 nm with polydispersity index of 0.260 and had the largest diffusion constant of 4.28 × 108 amongst the three forms of the formulation (crude, acetone concentrated and partially purified) on DLS characterization. The SEM-EDS analysis showed occurrence of 18.32 and 3.79%weight and %atom of Ag element respectively. The prepared formulation was investigated for its dehairing performance. The ideal dehairing was achieved at 37 °C after 12 h of treatment. The histopathological studies revealed that complete dehairing with minimal rarefication was achieved and was found perform better compared to the commercial Akp and control (crude enzyme) formulations.

Silver Nanorods Layer Based on Polyvinyl Alcohol on Glass Substrates by Dip-Coating Method

This research reports the investigation of the performance of a thin layer based on silver nanorods using the dip-coating method. The synthesis was conducted by polyol method at an oil bath temperature of 140 °C. In the synthesis of silver nanorods, materials used were silver nitrate (AgNO3) as the main raw material, ethylene glycol (EG) as the solvent, and a small amount of sodium chloride (NaCl) as a mediated-agent (precursor). Polyvinyl alcohol (PVA) used as a capping agent and stabilizer in this process. Diameter and length of silver nanorods were 800 nm and 15 µm, respectively. Furthermore, the silver nanorods suspension was deposition onto a glass substrate with a variety of dipping cycles. The result showed the thickness of the thin layer is linear with a number of dipping cycles. Electrical and optical properties of thin layer show that sheet resistance about of 30 Ω sq-1 by transmittance above of 80%. The silver nanorods thin film can be used as a conductive and transparent electrode for various optoelectronic applications.

ChemInform Abstract: Beyond Spheres: Murphy′s Silver Nanorods and Nanowires

AbstractReview: 27 refs.

Synthesis of Silver Nanorods Using Lamellar Liquid Crystal of Protic Ionic Liquids

Synthesis of Silver Nanorods Using Lamellar Liquid Crystal of Protic Ionic Liquids

Synthesis of silver nanorods using Coscinium fenestratum extracts and its cytotoxic activity against Hep-2 cell line

Silver nanorod has attracted considerable interest due to its potential applications in display technologies, thermoelectric and electronic devices, optoelectronic devices and biomedicine. In this study, crystalline silver nanorods were successfully prepared from AgNO3 using Coscinium fenestratum extract as a reducing agent. The products were characterized by UV–visible spectroscopy, FTIR (Fourier-transform IR) spectroscopy and SEM (scanning electron microscopy) analysis. Bundle-like nanostructures were observed by SEM analysis and the diameters of the nanorods were found to be in the range of 28.5–68.0nm. The MTT assay results revealed that silver nanorod exhibit significant cytotoxic effect on HEp-2 cells.

Synthesis of Silver Nanorods by Low Energy Excitation of Spherical Plasmonic Seeds

Plasmon excitation of Ag seed particles with 600-750 nm light in the presence of Ag(+) and trisodium citrate was used to synthesize penta-twinned nanorods. Importantly, the excitation wavelength can be used to control the reaction rate and, consequently, the aspect ratio of the nanorods. When the excitation wavelength is red-shifted from the surface plasmon resonance of the spherical seed particles, the rate of Ag(+) reduction becomes slower and more kinetically controlled. Such conditions favor the deposition of silver onto the tips of the growing nanorods as compared to their sides, resulting in the generation of higher aspect ratio rods. However, control experiments reveal that there is only a range of low energy excitation wavelengths (between 600 and 750 nm) that yields monodisperse nanorods. This study further highlights the utility of using wavelength to control the size and shape of growing nanoparticles using plasmon-mediated methods.

Role of spacer lengths of gemini surfactants in the synthesis of silver nanorods in micellar media

In this work, we have prepared Ag-nanorods using biscationic gemini surfactant micelles as the media by a seed-mediated wet synthesis method. Towards this end, we first synthesized Ag-nanoseeds of diameter ~7 nm stabilized by trisodium citrate (as the capping agent). Then these Ag-nanoseeds were used to synthesize Ag-nanorods of different aspect ratios. With decreasing Ag-nanoseed concentration, the aspect ratios of the Ag-nanorods stabilized by these gemini surfactants increased gradually. Various Ag-nanoseeds and Ag-nanospecies were characterized using UV-Vis spectroscopy (to know the surface plasmon bands), transmission electron microscopy (to find out their particle sizes and distribution), energy-dispersive X-ray spectroscopy and X-ray diffraction. When we used micelles derived from gemini surfactants of shorter spacer -(CH(2))(n)- (n = 2 or 4) to stabilize the Ag-nanorods, the λ(max) of the longitudinal band shifted more towards the blue region compared to that of the gemini surfactant micelles with a longer spacer -(CH(2))(n)- (n = 5, 12) at a given amount of the Ag-nanoseed solution. So, the growth of Ag-nanorods in the gemini micellar solutions depends on the spacer-chain length of gemini surfactants employed.

DDA-Based Simulation of UV–vis Extinction Spectra of Ag Nanorods Synthesized Through Seed-Mediated Growth Process

Present investigation demonstrates a very simple seed-mediated route for the synthesis of silver nanorods in aqueous solution. Central to the concept of seed-mediated growth of nanoparticles is that small nanoparticle seeds serve as nucleation centres to grow nanoparticles to a desired size and shape. Hydroxypropyl methyl cellulose (HPMC) has been used as soft template for one-dimensional growth of silver particles. Morphological, structural and spectral changes that are associated with the seed-mediated growth of the nanoparticles in presence of HPMC are characterized using UV–vis and HR-TEM spectroscopic study. Simulation of UV–vis extinction spectra of our synthesized silver nanorods has been carried out using discrete dipole approximation methodology. The broad red-shifted longitudinal extinction band of green-coloured silver sol has been explained, due to the presence of silver nanorods of different aspect ratios.

Synthesis of silver nanorods and application for die attach material in devices

Silver nanorods have been successfully synthesized in high yield by a polyol process in the presence of FeCl3. The yield and morphology of the silver particles from these conditions were dependant on the concentration of FeCl3, and the molar ratio of the capping agent to AgNO3. The optimized conditions for the synthesis of the nanorods were: 20 μM of FeCl3 and a molar ratio of 1.8:1 of capping agent to AgNO3. The nanorods produced were used to form a silver layer at 400 °C with a low electrical resistivity of 6.1 × 10−6 Ω cm. The silver layer was applied as die-attachment films to connect a SiC chip to a copper substrate. This formed a porous structure, which was evaluated for structure and strength.

Synthesis of silver nanorods and nanowires by tartrate-reduced route in aqueous solutions

A simple, template-less, self-seed and aqueous-phase synthesis of bicrystalline silver nanorods and nanowires is described and potassium tartaric was used as a reductant to reduce silver nitrate (AgNO 3) for the first time in the presence of poly (vinyl pyrrolidone) (PVP). By changing the AgNO 3/PVP ratio, the diameter and length of silver nanorods and nanowires can be controlled. The end-to-end assembly of the silver nanorods was found. It is indicated that, from the selected-area electron diffraction (SAED) study, the silver nanocrystals are generated with a bicrystalline structure. The effect of the concentration of NaOH is investigated and the reactions taken place during the formation of nanostructure silver is proposed.

Microwave-assisted synthesis of silver nanorods

Microwave-assisted synthesis of silver nanorods