Journal
ADVANCED MATERIALS TECHNOLOGIES
Volume 2, Issue 6, Pages -Publisher
WILEY
DOI: 10.1002/admt.201600270
Keywords
Ag; Pd alloy nanostructures; femtosecond laser direct writing; flexible integration; microfluidic chip; robust SERS substrates
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Funding
- National Natural Science Foundation of China (NSFC) [91423102, 91323301, 61378053, 51335008, 61590930]
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This paper demonstrates femtosecond laser direct writing mediated flexible integration of plasmonic Ag/Pd alloy nanostructures that can be potentially used as a robust surface-enhanced Raman spectroscopy substrate inside the microfluidic chip. Silver-palladium alloy with controllable composition ratio can be patterned into plasmonic nanostructures due to two-photon absorption induced coreduction of silver/palladium double metal ions. Since the alloy structures can effectively protect the silver from oxidation, thus they can facilitate the stable on-chip detection devices with long lifetime. The as-fabricated silver-palladium alloy substrate with 18% content of palladium maintains a relatively high enhancement factor of about 2.62 x 10(8) while at the same time demonstrating the best stability against aerobic oxidation, as it is stable for up to 20 d under ambient aerobic conditions, exhibiting a significant improvement compared to those unprotected silver substrates which have a limited lifetime of only 3 or 4 d.
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