Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement

Abstract

This version is available at https://strathprints.strath.ac.uk/47444/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractSpherical and monodispersed silver nanoparticles (AgNPs) are ideal for fundamental research as the contribution from size and shape can be accounted for in the experimental design. In this paper a seeded growth method is presented, whereby varying the concentration of sodium borohydride reduced silver nanoparticle seeds different sizes of stable spherical nanoparticles with a low polydispersity nanoparticles are produced using hydroquinone as a selective reducing agent. The surface-enhanced Raman scattering (SERS) enhancement factor for each nanoparticle size produced (17, 26, 50, & 65 nm) was then assessed using three different analytes, rhodamine 6G (R6G), malachite green oxalate (MGO) and thiophenol (TP). The enhancement factor gives an indication of the Raman enhancement effect by the nanoparticle. Using non-aggregated conditions and two different laser excitation wavelength (633 nm and 785 nm) it is shown that an increase in particle size results in an increased enhancement for each analyte used.

SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging

“…Typically, the highest enhancements for silver and gold nanoparticles with spherical shapes are observed in the size range of 40−60 nm diameter. 80,81,87 Equation 1 would suggest that the optimal condition for maximal SERS intensities is when the LSPR peak has high overlap with the laser line and Raman-scattered frequencies. However, experimental observations have shown that this is not always the case.…”

Development of X-ray micro-focus computed tomography to image and quantify biofilms in central venous catheter models in vitro

“…After staining, the silver nitrate-stained samples were drained and 1 ml of freshly prepared hydroquinone-reducing solution was added and left under aluminium foil for 1 min, followed by a distilled water rinse. While colloid size was not assessed, similar methodology generates colloids in the region of 11 nm, with a range up to 65 nm (Cassar et al, 2014;Pacioni et al, 2015). The osmium tetroxide-uranyl acetate-nano gold and silver nitrate-stained samples were washed twice for 10 min with 1.5 ml 0.1 M PIPES buffer.…”

Fundamentals and applications of SERS-based bioanalytical sensing

“…The SERS activity of spherical gold nanoparticles (AuNPs) and AgNPs improve by increasing the size. Spheres [50,97], nanorods [56,61,91], nanoplates [60], nanowire [98], nanobars [92], and nanorice [92] have been successfully prepared and shown to have different SERS properties.…”