Self‐assembly of silver nanocolloids in the Langmuir–Blodgett Film of stearic acid: Evidence of an efficient SERS sensing platform

Abstract

Highly sensitive surface-enhanced Raman scattering active substrate obtained by self-assembly of silver nanocolloids (AgNCs) in the bilayer Langmuir-Blodgett (LB) film of stearic acid (SA) has been reported. Rhodamine 6G (R6G) has been used as the probe molecule to test the efficacy of the as prepared substrate. Gigantic enhancement factors~10 12 orders of magnitude have been estimated from the surface-enhanced resonance Raman scattering [SER(R) S] spectrum of R6G, which proves that the as prepared substrate is superior or comparable with silver nanoparticle as dried AgNC solutions on microscopic slides. The optical properties of the as prepared substrates have been envisaged by ultraviolet-visible absorption spectra, while their morphological features are mapped through field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) images. A correlation has been drawn between the SER(R) S efficacy and the corresponding FESEM and AFM images of the as prepared substrates. Electric field distributions around the aggregated AgNCs have been estimated with the aid of three-dimensional finite difference time domain simulation studies. Localized surface plasmon coupling between the nanoaggregated geometries may be altered by lifting the LB film of SA at various surface pressures.

Recent advances in linear and non‐linear Raman spectroscopy. Part XI

“…Saha and co‐workers studied self‐assembly of silver nanocolloids in the Langmuir–Blodgett Film of stearic acid as evidence for an efficient SERS sensing platform. They find gigantic enhancement factors (∼10 12 ) have been estimated from the SERS [SER(R)S] spectrum of R6G, which proves that the prepared substrate is superior or comparable with silver nanoparticle as dried AgNC solutions on microscopic slides . Saxena and co‐workers have used Raman spectroscopy to study the interplay between phonon confinement and the Fano effect in silicon nanowires.…”

“…They find gigantic enhancement factors (∼10 12 ) have been estimated from the SERS [SER(R)S] spectrum of R6G, which proves that the prepared substrate is superior or comparable with silver nanoparticle as dried AgNC solutions on microscopic slides. [84] Saxena and co-workers have used Raman spectroscopy to study the interplay between phonon confinement and the Fano effect in silicon nanowires. They concluded that such an interplay can be represented by considering a general Fano-Raman line-shape equation to represent the combined effects in SiNWs.…”

Growth of silver nanoparticles on unpolished silicon substrate by used of microwave-assisted technique to enhance the Raman spectrum of glucose

“…In the practical application, silver nanoparticles are coated on the substrate, which is known as SERS substrate. Mostly, researchers start to prepare good colloidal silver nanoparticles and then to deposite them on a certain substrate using spin coating technique [8], Langmuir Blodgett technique [9], drop dry technique [2], block copolymer process [10] and printing technique [11] which are known quite complicated. Furthermore, the silver nanoparticles are sometimes not easily to deposit on the substrate, thus the silver nanoparticles disappear when the substrate is immersed in liquid sample or analyte.…”

Green Synthesis of Silver Nanoparticles using <i>Lantana camara</i> Fresh Leaf Extract for Qualitative Detection of Hg²⁺, Cu²⁺, Pb²⁺, and Mn²⁺ in Aqueous Solution

“…Methods that have been used to produce AgNPs include chemical methods [21], electrochemistry [22], radiation [23], photochemical methods [24], Langmuir-Blodgett [25], and phytochemicals-based approaches [26]. The use of chemical methods involves toxic chemicals, such as reducing agents and capping agents that are not safe for the environment.…”