Fast tailoring of gold nanoflowers by an interface-modified reverse microdroplet strategy

Ag–Au–Cu Trimetallic Alloy Microflower: A Highly Sensitive SERS Substrate for Detection of Low Raman Scattering Cross-Section Thiols

“…We infer that the broadness in the extinction spectra is due to the aggregation of the individual smaller nanoparticles during MF formation, which is characteristic of highly branched structures like this due to their hybridized plasmon resonances. 28,43 Further, when we compared the extinction spectra of Ag−Au and Ag−Cu bimetallic MFs, we found that Ag−Au was less broad with an LSPR maximum at 450 nm, whereas Ag−Cu was very broad with an LSPR maxima at 520 nm. Therefore, a close look at the extinction spectrum for TM73 MFs ensured that it was a hybrid of the extinction spectra for (90−10) Ag−Au and (90−10) Ag−Cu bimetallic MFs (Figure 2b), supporting the formation of trimetallic hybrid nanostructures representing the plasmonic properties of Ag, Au and Cu.…”

“…The shape and composition of the plasmonic nanostructures are critical factors for the essential SERS enhancement. Since its accidental discovery in 1977, a wide variety of plasmonic metals such as Ag, 20 Au, 21 Cu, 22 Pd, 23 Al, 24 etc., have been used for various SERS applications by fabricating SERS substrates of various shapes, including nanoparticles, 25 rods, 26 stars, 27 flowers, 28 wires, 29 dendrites, 30 etc. Although SERS substrates of monometallic composition of Ag and Au have been extensively explored, recently, multimetallic SERS substrates have been gaining tremendous attention due to the synergistic effects that can greatly enhance the plasmonic and chemical properties compared to monometallic counterparts.…”

Silver decahedral nanoparticles with uniform and adjustable sizes for surface-enhanced Raman scattering-based thiram residue detection

“…Usually, SERS substrates are designed as nanostructures with tips or gaps because the signicantly enhanced local electric eld is conned in a narrow space, resulting in "hot spots". Through the unremitting efforts of researchers, a series of nanostructures with hot spots have been realized, such as nanoplates, 24,25 nanostars, 26,27 nanoowers, 28,29 nanocubes, 30,31 nanocages, 32,33 and snowake-like nanoparticles. 17,34 Although these structures possess considerable SERS-enhanced effects, there are always signicantly different nano-morphologies in the same batch, which we believe may lead to changes in the intensity of the SERS signal, thus inuencing the reproducibility.…”