One‐Pot Synthesis of Icosahedral Silver Nanoparticles by Using a Photoassisted Tartrate Reduction Method under UV Light with a Wavelength of 310 nm

Abstract

A photoassisted citrate reduction reaction under blue LEDs is an easy and highly reproducible method to synthesize high-yield decahedral silver nanoparticles (AgNPs) in the absence of seeds in the initial photochemical reaction. In this study, icosahedral AgNPs with sizes of 80 to 150 nm could be synthesized by using the photoassisted tartrate reduction method under UV light with a wavelength of λ=(310±12) nm. The product yield of icosahedral AgNPs is higher than 90 %. SAED (selected-area electron diffraction) patterns and XRD (X-ray diffraction) spectra show that these AgNPs have multiply twinned structures. High-resolution TEM and dark-field TEM show that the facet of the triangular planes of these icosahedral AgNPs is {111}. This is the first report of icosahedral AgNPs synthesized by using a seed-free photochemical method. SERS (surface-enhanced Raman scattering) of Crystal Violet (CV) measurements show that the as-prepared icosahedral AgNP colloids have excellent SERS enhancement factors, which are approximately four and six times the enhancement factors of decahedral AgNP colloids and thermal-citrate-reduction AgNP colloids, respectively.

Rapid detection of perfluorinated sulfonic acids through preconcentration by bubble bursting and surface‐assisted laser desorption/ionization

“…The properties of AgNPs depend mainly on their shape, size (controllable by numerous methods), refractive index, and surface modification 26–28 . Two different AgNP shapes were used for comparison.…”

“…The properties of AgNPs depend mainly on their shape, size (controllable by numerous methods), refractive index, and surface modification. [26][27][28] Two different AgNP shapes were used for comparison. AgNPts and spherical AgNPs were used as assisting materials for the SALDI to compare limit of detection (LOD) for PFOS analysis.…”

Utilizing AgNPt-SALDI to Classify Edible Oils by Multivariate Statistics of Triacylglycerol Profile

“…In the present study, AgNPs are used to assist with the detection of TAGs in edible oil. The properties of AgNPs are related to their shape, size, refractive index, and surface modification, which are controllable through numerous synthesis methods [ 30 , 31 , 32 ]. Different forms of AgNPs were prepared for use in a SALDI sample, and their performance was compared.…”

In Vitro and In Vivo SERS Biosensing for Disease Diagnosis

“…Noble metals such as silver (Ag) and gold (Au) exhibit LSPR in the visible and near-infrared regime of the electromagnetic spectrum, due to negative real and small, positive imaginary components of the dielectric functions in this wavelength range. SERS substrates range from colloidal and monodisperse nanoparticles (NPs) of varying morphologies from simple (e.g., spheres [ 6 ], rods [ 7 ], cubes [ 8 ]) to complex (e.g., nanorice [ 8 ], nanourchins [ 9 ], prisms [ 8 ], and polyhedra [ 8 , 10 ]), as well as more complex multidimensional materials that are greatly enhancing and reproducible (e.g., film-over-nanosphere [ 1 ], disc-on-pillar arrays [ 11 ]). The enhancement on SERS substrates is generated due to the creation of “hot spots”, the junction between two nanostructured features where the electric fields are concentrated.…”