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[Advanced Materials Technologies] Femtosecond Laser Direct Writing of Plasmonic Ag/Pd Alloy Nanostructures Enables Flexible Integration of Robust SERS Substrates

March 21, 2017

Abstract:

 

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 × 108 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.

 

Zhuo-Chen Ma, Yong-Lai Zhang, Bing Han, Xue-Qing Liu, Han-Zhuang Zhang, Qi-Dai Chen, Hong-Bo Sun
First published: 15 March 2017
DOI: 10.1002/admt.201600270

 

Link: http://onlinelibrary.wiley.com/doi/10.1002/admt.201600270/full

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