Dual-step hybrid SERS scheme through the blending of CV and MoS2 NPs on the AuPt core-shell hybrid NPs

Hybrid UV Photodetector Design Incorporating AuPt Alloy Hybrid Nanoparticles, ZnO Quantum Dots, and Graphene Quantum Dots

“…Meanwhile, during the second-step SSD, the secondary tiny Au NPs also evolved in the background in between the AuPt NPs as seen in Figure a-3, resulting in the alloy hybrid NP (AHNP) configuration, i.e., alloyed AuPt NPs surrounded by tiny Au background NPs. At higher temperatures such as 600 and 800 °C, the surface diffusion can be enhanced and the AuPt NPs tend to absorb more close adatoms from the neighbors and the absorption boundary can grow along with the increased size . Consequently, further growth can lead to larger AuPt alloy NPs along with the increased size of background Au NPs as clearly seen in Figure b,c and corresponding line profiles in Figure b-2–c-2,b-3–c-3.…”

“…In terms of the fabrication mechanism, the Au adatoms experience diffusion upon annealing through the SSD process. As the chemical potential of already formed Pt NPs is higher, an inward diffusion of Au adatoms can occur toward Pt NPs . Along with the inward diffusion, an interfacial intermixing between Pt and Au can occur due to the miscibility between two metallic atoms .…”

“…Ultraviolet (UV) photodetectors (PDs) have been widely adapted in various applications such as flame sensing, communication, and environmental research. , In pursuit of better sensitivity, stability, and flexibility, the hybrid device configuration incorporating multiple components in a single PD device has attracted large attention as an effective design concept due to its tunable nature, superior light absorption, and added functionality. − The term “hybrid” refers to the offspring of two different animal or plant species or varieties and in the same sense, the “hybrid” is used here, combining two or more elements or components in a single device. In terms of conventional semiconductors, zinc oxide (ZnO) is a noteworthy candidate based on the wide direct band gap (3.37 eV), high carrier concentration, high chemical stability, and simple fabrication .…”

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

“…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.…”

Formation of Gold Nanoparticle Self-Assembling Films in Various Polymer Matrices for SERS Substrates

“…However, these are expensive to synthesize and unsuitable for commercial use as easy, inexpensive synthesis is crucial for these substrates. Graphene, titanium, or silicon oxides, molybdenum disulfide, metal nanoparticles, and composites are candidate material systems [ 29 , 30 , 31 ]. However, metal nanoparticles remain the main material for the preparation of SERS substrates, largely since they allow the possibility of modifying the particle surface [ 32 ].…”