Journal
LUMINESCENCE
Volume 33, Issue 6, Pages 1113-1121Publisher
WILEY
DOI: 10.1002/bio.3517
Keywords
aptamer regulation; gold nanoreaction; graphene oxide catalysis; Hg (II); SERS
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Funding
- National Natural Science Foundation of China [21667006, 21767004, 21477025, 21465006]
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The as-prepared graphene oxide (GO) exhibited a strong catalytic effect on reduction of HAuCl4 by trisodium citrate to form gold nanoplasmons (AuNPs) with a strong surface-enhanced Raman scattering (SERS) effect at 1615cm(-1) in the presence of molecular probe Victoria blue 4R (VB4r). SERS intensity increased with nanocatalyst GO concentration due to the formation of more AuNP substrates. The aptamer (Apt) of Hg2+ can bind to GO to form Apt-GO complexes, which can strongly inhibit nanocatalysis. When target Hg2+ is present, the formed stable Hg2+-Apt complexes are separated from the GO surface, which leads to GO catalysis recovery. The enhanced SERS signal was linear to Hg2+ concentration in the range 0.25-10nmol/L, with a detection limit of 0.08nmol/L Hg2+. Thus, a new gold nanoplasmon molecular spectral analysis platform was established for detecting Hg2+, based on Apt regulation of GO nanocatalysis.
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