Growth and surface-enhanced Raman scattering of Ag nanoparticle assembly in agarose gel
Keating, M. and Chen, Y. and Larmour, I. A. and Faulds, K. and Graham, D. (2012) Growth and surface-enhanced Raman scattering of Ag nanoparticle assembly in agarose gel. Measurement Science and Technology, 23 (8). -. 084006. ISSN 0957-0233 (https://doi.org/10.1088/0957-0233/23/8/084006)
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Agarose gel loaded with silver nanoparticles has attracted a lot of attention recently due to its excellent molecular trapping capabilities and strong surface-enhanced Raman scattering (SERS). Despite its potential, the influence of the growth condition on the gel structure and resultant SERS intensity and reproducibility is not clear. In this work, we examine the effect of silver nitrate feed solution concentration, the precursor to neutral silver nanoparticles, on the resultant nanoparticle morphology, gel homogeneity, SERS signal intensity and reproducibility. SERS of trans-1,2-bis-(4-pyridyl) ethylene, a non-resonant molecule, was conducted. A substantial rise in SERS signal strength with increasing feed concentration was observed, accompanied by a modest increase in average particle size as disclosed by TEM analysis. At higher concentrations, gels possessed larger particles from broader size distributions which had a higher tendency to aggregate. This created a higher density of SERS 'hotspots', regions of intense electromagnetic field crucial for maximal enhancement of the Raman signal, but also led to increased spot-to-spot signal variation due to a marked change in nanoparticle morphology and gel homogeneity. Beyond an optimal feed concentration, no further increase in overall signal strength was evident, correlating with no appreciable rise in the number of larger particles.
ORCID iDs
Keating, M., Chen, Y., Larmour, I. A., Faulds, K.![ORCID logo](/images/orcid_16x16.png)
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Item type: Article ID code: 40972 Dates: DateEventAugust 2012PublishedKeywords: Raman scattering , nanoparticles, agarose gel, Physical and theoretical chemistry, Physics, Instrumentation, Applied Mathematics Subjects: Science > Chemistry > Physical and theoretical chemistry
Science > PhysicsDepartment: Unknown Department
Faculty of Science > Physics
Faculty of Science > Pure and Applied Chemistry
Technology and Innovation Centre > BionanotechnologyDepositing user: Pure Administrator Date deposited: 27 Aug 2012 09:37 Last modified: 14 Jan 2024 02:53 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/40972