Journal
NANO RESEARCH
Volume 7, Issue 8, Pages 1177-1187Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0480-5
Keywords
SERS; Ag-nanocube; polyacrylic acid sodium salt; trace detection
Categories
Funding
- National Key Basic Research Program of China [2013CB934304]
- CAS/SAFEA International Partnership Program for Creative Research Teams
- NSFC [51201159, 11274312, 11175204]
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Surface-enhanced Raman spectroscopy (SERS) is a fast analytical technique for trace chemicals; however, it requires the active SERS-substrates to adsorb analytes, thus limiting target species to those with the desired affinity for substrates. Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as Ag-nanocubes@PAAS) as an effective SERS-substrate for analytes with and without high affinity. Once the analyte aqueous solution is cast on the dry Ag-nanocubes@PAAS substrate, the bibulous PAAS becomes swollen forcing the Ag-nanocubes loose, while the analytes diffuse in the interstices among the Ag-nanocubes. When dried, the PAAS shrinks and pulls the Ag-nanocubes back to their previous aggregated state, while the PAAS network detains the analytes in the small gaps between the Ag-nanocubes for SERS detection. The strategy has been proven effective for not only singleanalytes but also multi-analytes without strong affinity for Ag, showing its potential in SERS-based simultaneous multi-analyte detection of both adsorbable and non-adsorbable pollutants in the environment.
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