Fabrication of hybrid Pd@Ag core-shell and fully alloyed bi-metallic AgPd NPs and SERS enhancement of Rhodamine 6G by a unique mixture approach with graphene quantum dots

Surmounting the interband threshold limit by the hot electron excitation of multi-metallic plasmonic AgAuCu NPs for UV photodetector application

“…2(a) and the NPs were fabricated by annealing the multi-metallic layers at 550 °C for 120 s based on the solid state dewetting (SSD) method. 20,22,26 The annealing temperature of thin-film dewetting was well below the melting point (T m ), ranging from 0.3 to 0.5T m , where 0.3T m can guarantee the minimum energy required for atomic diffusion while 0.5T m can be enough energy for atomic diffusion in the bulk phase. 26 In this regard, 550 °C was selected to conduct the SSD process as the T m of Cu is 1085 °C with the T m being Cu > Au > Ag.…”

“…21 The generation of hot electrons is mainly due to the intra-band transition in the Ag NPs while it is due to inter-band transition for the Au and Cu NPs. 19,[21][22][23] With multi-metallic alloy NPs, the interband threshold can be improved and at the same time, the high forward scattering behavior of metallic NPs toward the semiconductor can improve the hot electron generation and injection efficiency. [21][22][23] Considering the intriguing advantages of multi-metallic NPs, the construction of a hybrid UV-PD device composed of Ag, Au and Cu plasmonic NPs can offer a promising route to overcome the performance limit of conventional UV PDs, which has not been attempted so far.…”

Hybridization of 2D MoS2 Nanoplatelets and PtAu Hybrid Nanoparticles for the SERS Enhancement of Methylene Blue

“…The core-shell PtAu HNPs demonstrated the strong LSPR and electromagnetic fields localized in the nanogaps between NPs and upon the laser irradiation, an intense EM field can be concentrated on the localized volume of MB molecules. [36,40] As a result, the MB molecules on the core-shell PtAu HNPs can generate the enhanced Raman signals, [19] which is generally referenced as the electromagnetic enhancement mechanism (EM). [38,41] Figure 7c shows the mixture ratio variation of MoS 2 nanoplatelets with the 10 -5 m of MB.…”

“…More recently, the low-dimensional nanostructures and 2D semiconductor materials have emerged as the SERS substrates. [18][19][20][21] The low-dimensional nanostructures such as ZnO QDs can offer the increased surface area. The atomically thin semiconductor layers such as graphene, WS 2 , and MoSe 2 can offer the rich charge transfer.…”

Facile synthesis of Au@palladium oxide nano-sunflowers for ultrasensitive surface-enhanced Raman scattering analysis

“…26,27 Pd element is also utilized to fabricate bimetallic nanostructures with LSPR features for SERS applications. [28][29][30] However, the current synthetic strategy of Pd bimetallic nanostructures is relatively complicated and their SERS activities are somewhat unsatisfactory. [31][32][33] The SERS activity of metal-based nanostructures is largely attributed to the EM effect, while the contribution of the CM is much weaker (enhancement factor no more than 10 2 ).…”