ISSN:
0897-4756
Content:
Ag-Au hybrid nanosponges (NSs) with controlled porosity and composition ratio were fabricated through the cyclic electroless deposition of Ag into the porous Au NSs. In the Ag-Au hybrid NSs, both Au and Ag components with mesoscaled ligament size are bicontinuously percolated over the entire structure. The plasmonic properties of the Ag-Au hybrid NSs differ clearly from those of the Au NSs and the solid Au-Ag alloy nanoparticles, and two distinct plasmon peaks were observed which can be attributed to Au and Ag components, respectively. The plasmonic properties can be well tuned by controlling the cycles of Ag deposition. Both plasmon peaks attributed to Au and Ag components blue shift with increasing amount of Ag. The volume porosity decreases upon increasing amount of deposited Ag. The results of the theoretical calculations reveal that the deceasing porosity could play an important role in the blue shift. Moreover, the Ag-Au hybrid NSs exhibit higher sensitivity in surface-enhanced Raman spectroscopy (SERS) detection of butter yellow (BY) than the Au NSs due to the presence of Ag and of the porous structure. Also, the as-prepared structures present a built-in preference for hydrophobic analytes.
In:
Chemistry of materials, Washington, DC : Soc., 1989, 28(2016), 21, Seite 7673-7682, 0897-4756
In:
volume:28
In:
year:2016
In:
number:21
In:
pages:7673-7682
Language:
English
Author information:
Wang, Dong 1977-
Author information:
Wang, Hongmei 1990-
Author information:
Popp, Jürgen 1966-
Author information:
Schaaf, Peter 1963-
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