Journal
SMALL
Volume 9, Issue 2, Pages 234-240Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201201061
Keywords
plasmonic dimers; distance-mediation; colorimetric sensors; reususable switches; asymmetric functionalization
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Funding
- Science and Engineering Research Council [102 152 0014]
- National Medical Research Council of Singapore [EDG11may015]
- Natural Science Foundation of China [21205017, 21277025]
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The first reconfigurable colorimetric DNA switches based on target DNA binding are reported. This DNA binding actuates a change in the interparticle distance between gold nanoparticle dimers. A significant spectral shift of 68 nm is achievable from on-off switching. The reconfigurability is possible owing to thiol and EDC-imidazole coupling which anchors the DNA linkers to the nanoparticles. The huge spectral shift allows the unaided eye to observe single target biomolecular binding event in real time under a darkfield microscope. The limit-of-detection for target molecules in PBS and human serum are 10-13 M and 10-11 M respectively. An improved fabrication strategy via asymmetric functionalization is also described, assisted by solid phase synthesis which minimizes the formation of trimers and multimers.
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