Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 41, Pages 27772-27778Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09722
Keywords
metal ions; probe; alkyne; SERS; organic-rich water sample; test kit
Funding
- National Natural Science Foundation of China [21475100, 81471696, 41273093, 21175101]
- Foundation of China Geological Survey [12120113015200]
- Natural Science Foundation of Hubei Province of China [2014CFA002]
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Field and pretreatment-free detection of heavy-metal ions in organic polluted water is important but still challenging in current water pollution emergency response systems. Here we report a polyadenine-DNA-mediated approach for a rationally designed alkyne-coded surface enhanced Raman scattering (SERS) test kit, enabling rapid and simultaneous detection of Hg2+ and Ag+ by a portable spectrometer, impervious to organic interferences. Because of the formation of thymine (T)-Hg2+-T and cytosine (C)-Ag+-C, highly recognizable SERS signals are rapidly detected when two different alkyne-labeled gold nanoparticles (AuNPs) are induced to undergo controllable bridging upon the addition of low-volume targets. For multiplex detection through a portable spectrometer, the limits of detection reach 0.77 and 0.86 nM for Hg2+ and Ag+, respectively. Of particular significance, the proposed C C-containing Raman reporters provide an extremely effective solution for multiplex sensing in a spectral silent region, when the hyperspectral and fairly intense optical noises originating from lower wavenumber region (<1800 cm(-1)) are inevitable under complex ambient conditions.
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