Formation Of Silver Nanoplates Research Articles

Anisotropic growth of photoreduced silver nanostructures using surfactant-assisted ferroelectric templates for surface enhanced Raman spectroscopy

Photoreduction using ferroelectric templates is an emerging green technique for the production of noble-metal nanostructures by a reductant-free process. In this work, anisotropic growth of silver nanostructures is stimulated by a surfactant-assisted photoreduction process on ferroelectric templates. The preferential adsorption of surfactant (polyvinylpyrrolidone) on the specific facets of silver creates the anisotropic growth of nanostructures and thus the formation of silver nanoplates. The surfactant adsorption effects on the nanoparticle morphology and the nanoparticle properties are studied. Their influence levels depend on the ratio of surfactant concentration to precursor concentration. The produced silver nanostructures have superior SERS features, such as the limit of detection of <10−8 M, the enhancement factor of 2.2 × 109 and Raman intensity enhancement by 8.71 times. The study of anisotropic growth of photoreduced nanoparticles using ferroelectric templates provides a promising prospect to develop green production techniques for versatile anisotropic nanoparticles.

Qiao Zhang.

"My favorite time of day … is the evening when I can spend my time with my family. The energy that my family provides always keeps me moving forward. The secret of being a successful scientist … is to not rely completely on the literature. Sometimes an unconstrained woolgather can help us find new ideas. "This and more about Qiao Zhang can be found on page 319.

Ultrafast synthesis of silver nanoplates in ethanol at room temperature

The formation of silver nanoplates was obtained based on aged NaBH4 in the presence of NaBO2.

Synthesis of Silver Nanoplates with Fibronectin Nanofibril Template and Their SERS Applications

In this work, a novel strategy is provided to prepare silver nanoplates by a fibronectin (Fn) nanofibril template. First, Fn molecules were controlled to assemble into amyloid-like nanofibrils in highly concentrated ethanol aqueous solution. The resultant nanofibrils could serve as a soft template to direct the formation of silver nanoplates. It is worth noting that the silver nanoplates are excellent surface-enhanced Raman scattering (SERS) substrate with 4-aminothiophenol (4-ATP) molecule as a test probe. This high active SERS substrate can also be used to detect drug molecule, 2-thiouracil with high sensitivity.

Preparation and Process Clarification of Metal Nanoplate by Pulse Wire Discharged Method in Liquid Media

The synthesis of triangular silver nanoplates on various substrates was studied in this work. A silver nanocolloid/solution was prepared by a pulsed wire discharged (PWD) method in deionized water with various wire diameters and relative energies (K), where K is defined as the ratio of the charged energy of the capacitor to the vaporization energy of the wire. The effect of the substrate dipping time in the silver colloid/solution on silver nanoplate growth was investigated. The formation of the silver nanoplate has been analyzed using X-ray diffraction (XRD) with Cu Kα radiation and scanning electron microscopy (SEM). The results indicated that silver nanoplates were formed on Cu, W, Ni, and Si substrates but not on SiO2 substrates with increasing K. The size or number of silver nanoplates increased rapidly on Si(100) substrates. With increasing substrate dipping time, the size or the number of triangular silver nanoplates linearly increased. It was concluded that the ionization of silver atoms in the discharge and the reduction of silver ions on the substrates are possible mechanisms behind the formation of silver nanoplates on substrates.

A Mechanistic Study on the Formation of Silver Nanoplates in the Presence of Silver Seeds and Citric Acid or Citrate Ions

The world on a plate: In addition to their role as a capping agent that selectively binds to the {l_brace}111{r_brace} faces of silver, the carboxylate group can coordinate with Ag+ ions to form complexes and thus substantially reduce the reduction rate of Ag+ ions, leading to the formation of silver seeds with both twin planes and stacking faults.