Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 10, Pages 6184-6190Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp3002977
Keywords
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Funding
- Renishaw Diagnostics Ltd.
- UK EPSRC [EP/F059396/1, EP/G060649/1]
- EPSRC [EP/H028757/1]
- EPSRC [EP/F059396/1, EP/H028757/1, EP/G060649/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H028757/1, EP/F059396/1, EP/G060649/1] Funding Source: researchfish
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Understanding the complex relationship between peak enhancement and the underlying broad continuum (called the background) is crucial for developing reliable and quantitative applications of surface-enhanced Raman scattering (SERS). Here we use a gentle mechanochemical (snow jet) process to perturb molecules on a SERS active substrate to track the dynamics of the different contributions to SERS. By use of the snow jet process we are able to increase SEAS signals on substrates by 500% or more while simultaneously increasing the peak:background intensity ratio. We identify components of the signal arising from changes in molecular distribution and surface morphology using a multiplexed time-varied exposure technique developed in-house. This allows us to distinguish between processes decaying over time and those decaying due to laser heating. Our study goes a long way toward disentangling the different contributions to SERS peak and background continuum signals and points to the different origins of these two co-occurring processes on nanostructured plasmonic substrates. This deeper understanding of the SEAS process is crucial to allow SERS to reach its full potential.
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