Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 368, Issue -, Pages 429-435Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.01.070
Keywords
Core-shell configuration; Porous zeolite imidazole framework; Urchin-like Au-Ag alloyed nanocrystals; Wrapping-enhanced SERS effect; Trace hexachlorocyclohexane detection
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Funding
- National Key Research and Development Program of China [2017YFA0207101]
- Natural Science Foundation of China [51531006, 11574313, 51571188]
- CAS/SAF International Partner-ship Program for Creative Research Teams
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A core-shell configuration of the zeolite imidazole framework (ZIF-8) wrapped urchin-like Au-Ag alloyed nanocrystals (UAANs) were designed and fabricated via adding the pre-formed plasmonic nanoparticles into the ZIF-8 precursor solution with hexadecyltrimethyl ammonium bromide (CTAB). The UAANs are about 100 nm in size with high-density tips. The ZIF-8 shell layer is nanoporous and can be controlled in thickness from 10 nm to 40 nm by the CTAB concentration. Importantly, such ZIF-8 wrapped UAANs can be used as the highly efficient surface enhanced Raman scattering (SERS) substrates for detection of the trace hexachlorocyclohexane (HCH) molecules. The ZIF-8 shell layer with an appropriate thickness (similar to 20 nm) can evidently increase the SEAS performance of the UAANs to the trace gamma-HCH and alpha-HCH. Such wrapping-enhanced SERS effect significantly increases, by a power function, with the decreasing HCH concentration, especially in the concentration below 10(-6) M, which is attributed to the ever-increasing enrichment effect to the HCH molecules. The detection limit is down below 1.5 ppb. This work presents a highly efficient substrate for the SERS-based detection of the trace HCH, and also displays the potential application in the SERS detection of volatile small molecules.
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