On the Effect of Native SiO₂ on Si over the SPR‐mediated Photocatalytic Activities of Au and Ag Nanoparticles

Abstract

In hybrid materials containing plasmonic nanoparticles such as Au and Ag, charge-transferp rocesses from and to Au or Ag can affectb oth activities and selectivity in plasmonic catalysis. Inspired by the widespread utilization of commercial Si wafersi ns urface-enhanced Raman spectroscopy (SERS) studies, we investigated herein the effect of the native SiO 2 layer on Si waferso ver the surfacep lasmonr esonance (SPR)-mediated activities of the Au and Ag nanoparticles (NPs). We preparedS ERS-active plasmonicc omprised of Au and Ag NPs deposited ontoaSi wafer.H ere, two kinds of Si wafers were employed:S iw ith an ative oxide surface layer (Si/SiO 2 )a nd Si without an ative oxide surfacel ayer (Si).

Enhanced catalysis of ultrasmall Au-MoS 2 clusters against reactive oxygen species for radiation protection

“…Thus, enhancement of catalytic activities is key for optimal radioprotective effects. In fact, enhanced catalytic activities from intercalation of metallic atoms have already been reported in recent years [38,39]. It was also reported that Au-MnO 2 , Al 2 O 3 -Au, Au-Pt and Au-TiO 2 hybrid systems show the enhancement of catalytic activities [4,5,[40][41][42].…”

Recent Advances in Plasmonic Nanostructures for Enhanced Photocatalysis and Electrocatalysis

“…The separated hot electrons and hot holes thus offer opportunities to change the activity and selectivity of the plasmon‐driven catalytic reactions of PATP and PNTP on metal/semiconductor heterostructures. [ 68,72–78 ] TiO 2 has been used for trapping hot electrons generated on Ag or Au NPs to enhance the activity of the oxidation of PATP. Recently, we have demonstrated the ultrafast SP‐induced coupling from PATP to DMAB on Ag/TiO 2 nanoarrays in inert gas (N 2 ) atmosphere, where hot holes in Ag NPs dominated the reaction.…”

Hot Electrons, Hot Holes, or Both? Tandem Synthesis of Imines Driven by the Plasmonic Excitation in Au/CeO2 Nanorods

“…Under light irradiation, this synergistic effect, due to the charge separation, is further promoted. Upon LSPR excitation of the Au NPs, hot electrons and hot holes are generated [ 13 , 14 ]. The hot electrons can be trapped at the redox sites of the CeO 2 while the hot holes remain at the Au NPs ( Figure 3 C and Figure S8 ).…”

“…For metals such as Ag, Au, Al, and Cu, the LSPR excitation can take place in the visible range [11,12]. Interestingly, the combination of CeO 2 and plasmonic NPs, such as Au, can provide opportunities for not only achieving improved performance but also opening up reaction pathways under light-excitation that are not accessible via external heating [13][14][15][16][17][18].…”