Journal
NANO LETTERS
Volume 15, Issue 1, Pages 669-674Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5041786
Keywords
Sensing; plasmonics; nanophotonics; plasmonic coupling; molecular conductivity; surface-enhanced Raman spectroscopy
Categories
Funding
- EPSRC [EP/G060649/1, EP/I012060/1, EP/L027151/1, EP/K028510/1]
- ERC [LINASS 320503]
- Winton Programme for the Physics of Sustainability
- MINECO [FIS2013-41184-P]
- Basque Department of Industry [ETORTEK 2014-15]
- Basque consolidated groups [IT756-13]
- EPSRC [EP/I000623/1, EP/K028510/1, EP/H007024/1, EP/I014039/1, EP/L027151/1, EP/K023845/1, EP/E015530/1, EP/G060649/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060649/1, EP/K028510/1, EP/L027151/1, EP/I014039/1, EP/H007024/1, 1352498] Funding Source: researchfish
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Gold nanoparticles are separated above a planar gold film by 1.1 nm thick self-assembled molecular monolayers of different conductivities. Incremental replacement of the nonconductive molecules with a chemically equivalent conductive version differing by only one atom produces a strong 50 nm blue-shift of the coupled plasmon. With modeling this gives a conductance of 0.17G0 per biphenyl-4,4'-dithiol molecule and a total conductance across the plasmonic junction of 30G0. Our approach provides a reliable tool quantifying the number of molecules in each plasmonic hotspot, here <200.
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