Shape Controllable Synthesis of Silver Particles by Selecting the Crystallization Routes

Abstract

Classic crystallization describes a burst nucleation followed by a layer-by-layer atom deposition. The non-classic crystallization refers to particle mediated crystallization process. Different crystallization routes lead to the formation of diverse structured materials. Here we report a rational synthesis of silver particles by selecting the crystallization routes. Silver particles were synthesized by a solution reduction approach. The crystallization routes were regulated by adding amino acids to stabilize silver ions which leads to the decrease of the reduction rate. Without amino acids, silver dendrites were largely formed. With the addition of amino acids, flower-like (low concentration of amino acids) and spherical silver (high concentration of amino acid) particles were synthesized. Three kinds of amino acids were tested and the similar results were obtained. The time-dependent characterization on the evolution of silver particles showed that silver dendrites were formed by the classic atom deposition while the other two morphologies were formed by the combination of classic and non-classic crystallization. The silver particles synthesized were evaluated for ethylene epoxidation and the dendritic particles demonstrated a high selectivity.

Development, Characterization and Valuable Use of Novel Dosimeter Film Based on PVA Polymer Doped Nitro Blue Tetrazolium Dye and AgNO3 for the Accurate Detection of Low X-ray Doses

“…These micrographs at increased magnifications show dendritic characters with a clear main trunk and side branches. Dendrite growth occurs as a result of the reduction of metal ions dissolved in the nanocomposite film, thereby growing in needle- or tree-like microstructures [ 66 ]. This form of degradation detected in the film after irradiation could therefore be specific to our nanocomposite film, thus offering more specificity and performance to this dosimeter designed for low doses of X-rays.…”

Silicon Nanostructures for Molecular Sensing: A Review

“…In the past decade, there have been incredible considerations on the fabrication and design of metal NSs on Si-based templates due to their prominent antibacterial, biocompatibility, catalysis, and optoelectronic properties. − Among the existing metal NSs, noble metal NSs have shown tremendous surface wetting properties in addition to narrow plasmon resonance. These highlighting factors have inspired the majority of studies in this area of interest for effective and innovative investigations. − These metal NSs demonstrate captivating properties on detection sensibilities and capabilities, which are strongly dependent on the size, shape, dimension, and separation between the metal NSs. , In a precise sense, the controllability over the size, shape, and distribution of metal NSs plays a vital role in the investigation of chemical and biomolecular detection in the new branch of sensing. − Furthermore, an engineering shape anisotropy of metal structures can influence the plasmonic response of metal NSs. There is an extensive class of reports on anisotropic NSs such as nanowires, nanoprisms, nanocubes, nanorods, pyramids, nanowires, nanostars, nanotriangles, nanoflowers, and nanodendrites. , The progressive developments and applications of metal NSs and their effectiveness in SERS sensing were demonstrated by Tong and co-workers .…”

On Recent Developments in Biosynthesis and Application of Au and Ag Nanoparticles from Biological Systems

“…Core-shell bimetallic nanoparticle formation is also possible [85]. e biosynthesis of silver nanoparticles, like any inorganic nanoparticles, requires three important steps, namely, the reduction of silver ions, crystal nucleation, and crystal growth [88,89]. e first step is the bioreduction of silver ions may be due to either enzymatic reactions or the effect of some reducing compounds or a combination of both.…”