10.1021/acs.chemmater.6b02637.s001
Yong Yan
Yong
Yan
Andreea
Ioana Radu
Andreea
Ioana
Radu
Wenye Rao
Wenye
Rao
Hongmei Wang
Hongmei
Wang
Ge Chen
Ge
Chen
Karina Weber
Karina
Weber
Dong Wang
Dong
Wang
Dana Cialla-May
Dana
Cialla-May
Jürgen Popp
Jürgen
Popp
Peter Schaaf
Peter
Schaaf
Mesoscopically Bi-continuous Ag–Au Hybrid Nanosponges
with Tunable Plasmon Resonances as Bottom-Up Substrates for Surface-Enhanced
Raman Spectroscopy
American Chemical Society
2016
plasmon peaks
SERS
BY
surface-enhanced Raman spectroscopy
NS
cyclic electroless deposition
Tunable Plasmon Resonances
plasmonic properties
mesoscaled ligament size
Ag components
volume porosity decreases
2016-10-04 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Mesoscopically_Bi-continuous_Ag_Au_Hybrid_Nanosponges_with_Tunable_Plasmon_Resonances_as_Bottom-Up_Substrates_for_Surface-Enhanced_Raman_Spectroscopy/4039818
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.