Journal
NANO LETTERS
Volume 12, Issue 11, Pages 5924-5928Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl303345z
Keywords
Quantitative SERS; cucurbit[8]uril; host-guest; self-assembled nanoparticles
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Funding
- Walters-Kundert Trust
- ERC starting investigator grant (ASPiRe)
- EPSRC [EP/H028757/1, EP/G060649/1]
- EU CUBiHOLE grant
- Krebs Memorial Scholarship (The Biochemical Society)
- Cambridge Commonwealth Trust
- EPSRC [EP/G060649/1, EP/H028757/1, EP/H007024/1, EP/F035535/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060649/1, EP/F035535/1, EP/H028757/1, EP/H007024/1] Funding Source: researchfish
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We show how the macrocyclic host, cucurbit[8]uril (CB[8]), creates precise subnanometer junctions between gold nanoparticles while its cavity simultaneously traps small molecules; this enables their reproducible surface-enhanced Raman spectroscopy (SERS) detection. Explicit shifts in the SERS frequencies of CB[8] on complexation with guest molecules provides a direct strategy for absolute quantification of a range of molecules down to 10(-11) M levels. This provides a new analytical paradigm for quantitative SERS of small molecules.
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