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Self‐assembly of silver nanocolloids in the Langmuir–Blodgett Film of stearic acid: Evidence of an efficient SERS sensing platform
Author(s) -
Saha Somsubhra,
Ghosh Manash,
Dutta Bipan,
Chowdhury Joydeep
Publication year - 2016
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4771
Subject(s) - raman scattering , rhodamine 6g , raman spectroscopy , langmuir–blodgett film , substrate (aquarium) , stearic acid , silver nanoparticle , materials science , analytical chemistry (journal) , surface plasmon resonance , rhodamine , chemistry , nanoparticle , nanotechnology , molecule , monolayer , optics , fluorescence , organic chemistry , composite material , physics , oceanography , geology
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. Copyright © 2015 John Wiley & Sons, Ltd.