Uniform Near-Spherical Nanoscale Silver Films for Surface-Enhanced Raman Spectroscopy Sensing

Abstract

Uniform near-spherical nanoscale silver films (NSFs) as a very sensitive and stable SERS-active substrate were synthesized by a facile and efficient in situ liquid−solid−solid (LSS) reaction method without expensive equipment and harmful reagent assistance. In this method, the in situ formation and thermal decomposition reactions of the Ag− melamine coordination polymer (AgM CP) nanowires was utilized to control the morphology and microstructure of the NSFs. The sensing performances of the synthetic NSFs as SERS substrates were investigated by using R6G as a probe molecule. The research results showed that the prepared NSFs possessed a very low detection limit down to 10 −13 M, a high analytical enhancement factor, and stable detection capabilities for the R6G molecule, which made them promising as cost-effective and highperformance SERS sensing platforms for trace molecular species detection.

SERS-based microdevices for use as in vitro diagnostic biosensors

“…Combinatory detection is used for synergetic enhancements. [252][253][254][255][256][257][258][259][260][261][262][263][264][265][266] 3.3.1. Bioassays using solid nanoplasmonic substrates using top-down approaches.…”

Novel pathway for the sonochemical synthesis of silver nanoparticles with near-spherical shape and high stability in aqueous media

“…In this context, finding new routes for the synthesis of AgNPs that increase the stability of their dimensional properties is an indispensable scientific task for the development of advanced applications in the field of nanoscience, nanotechnology, and nanometrology 9 . In fact, recent efforts have focused on the development of bottom-up wet synthesis routes to obtain AgNPs with high size control 10 , monodispersed size distribution 11 , and highly spherical shape 12 . Among them, several routes for the synthesis of AgNPs have been reported for the obtention of different particle sizes ranging from 5 to 100 nm 13 and even larger than 100 nm 14 .…”

Grain-Boundary-Induced Ultrasensitive Molecular Detection of Graphene Film

“…Surface-enhanced Raman scattering (SERS) has been considered an effective and sensitive analytical tool to realize trace detection in various fields, such as food safety and biochemical sensing . One SERS mechanism is the electromagnetic mechanism (EM) related to the resonant excitation of the surface plasmons of metals such as Au , and Ag, , and the other one is the chemical mechanism (CM) dependent on the charge transfer between molecules and substrate. Benefiting from the large surface area, fluorescence quenching, and unique CM effect, graphene has been emerging as an attractive substrate for Raman enhancement, known as “graphene-enhanced Raman scattering” (GERS) .…”