Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 1, Pages 1766-1772Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16529
Keywords
surface-enhanced Raman scattering; Ag nanoparticles; high reproducibility; nanoassembly; freeze-thaw
Funding
- National Science Foundation of China [21874021, 21575026, 21874072]
- Natural Science Foundation of Fujian Province [2019J01205]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R11]
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By using a simple freeze-thaw method, assemblies of highly reproducible Ag NPs with SERS activity can be fabricated without the use of ligands, offering long-term stability and reproducibility for practical SERS sensing applications.
The assemblies of plasmonic nanoparticles (NPs) are the universal methods for enhancing their surface-enhanced Raman scattering (SERS) activities. However, the present methods suffer from the problems of poor reproducibility, complicated fabrication, or the adsorption of ligands on the surface, which limit their practical applications. In this work, by using a facile freeze-thaw method, we are able to fabricate the assemblies of Ag NPs with highly reproducible SERS activity without the use of ligands. Moreover, the Ag NPs can be well kept in a frozen state for a long time with few influences on the reproducibility (relative standard deviation, RSD ca. 7%), while those kept in colloid (4 degrees C) suffer from gradual surface oxidation and aggregation. Such a simple freeze-thaw method does not require the introduction of any ligands (or linkers) with long-term stability and reproducibility, implying its wide applications in practical SERS sensing.
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