Investigation of the mechanisms of plasmon-mediated photocatalysis: synergistic contribution of near-field and charge transfer effects

Abstract

Plasmonic photocatalysis is an attractive way to drive and enhance chemical reactions. The relative importance of thermal and non-thermal effects in driving the reaction is still under debate in the...

Cathodoluminescence Spectroscopy of Complex Dendritic Au Architectures for Application in Plasmon‐Mediated Photocatalysis and as SERS Substrates

“…The same samples were then used as photocatalysts for the photochemical reaction of MB to thionine, by monitoring the temporal evolution of the molecular fingerprints from in situ SERS measurements, illuminated by a 633 nm laser. We have previously shown that this reaction on disordered Au nanoparticle arrays [ 46 ] is maximized when the excitation wavelength matches the plasmonic resonance and the HOMO–LUMO gap (highest occupied molecular orbital–lowest unoccupied molecular orbital, which for MB is 1.86 eV = 665 nm [ 47 ] ). Furthermore, we demonstrated that enhanced near‐fields and hot electron transfer contribute synergistically to drive the chemical transformation, and that photothermal effects do not play a role.…”

Coupling Au-loaded magnetic frameworks to photonic crystal for the improvement of photothermal heating effect in SERS

“…Finally, the aminated Fe 3 O 4 @SiO 2 MNPs (0.2 g) were completely dissolved in DI water (50 mL) under stirring. Next, the different amounts of the colloidal Au solution (12,15,18,22,25,28,31,35,40,50, and 60 mL) were slowly added under ultrasonication for 1 h, respectively. The nal Au-loaded Fe 3 -O 4 @SiO 2 MNPs were puried ve times by a combination of mechanical stirring and ultrasonic cleaning to remove excess Au NPs and then dried in a vacuum drying oven.…”

“…[6][7][8][9][10][11][12][13][14] Recently, numerous researchers have reported the potential role of the photothermal heating effect in SERS studies, however, the results are mixed. [15][16][17][18][19][20][21][22][23][24] For example, mild photothermal heating plays a positive role in SERS and has been widely employed in the eld of optical sensing and biological imaging. 25 On the other hand, the heat-induced degradation of analytes can produce carbonaceous species, cause desorption of the adsorbates in the excitation area, and lead to the catalytic transformation of analytes to produce other species.…”

Alternatives to Water Photooxidation for Photoelectrochemical Solar Energy Conversion and Green H2 Production

“…[79] The most widely studied plasmonic is Au due to its efficiency and chemical stability. [80][81][82] Au has been employed to enhance PEC performance of various broad bandgap and short carrier diffusion length semiconductors including TiO 2 , ZnO, WO 3 , or Fe 2 O 3 . [83][84][85][86][87] For instance, Au/TiO 2 photoelectrodes with various particle sizes demonstrated to greatly enhance photocurrent density, up to ≈46 times, under visible region.…”