Photocatalytic Au–Bi₂S₃ Heteronanostructures

Abstract

Au-Bi2S3 heteronanostructure photocatalysts were designed in which the coupling of a metal plasmon and a semiconductor exciton aids the absorption of solar light, enhances charge separation, and results in improved catalytic activity. Furthermore, these nanostructures show a unique pattern of structural combination, with Au nanoparticles positioned at the center of Bi2S3 nanorods. The chemistry of formation of these nanostructures, their epitaxy at the junction, and their photoconductance were studied, as well as their photoresponse properties.

Facile fabrication of Bi2S3/SnS2 heterojunction photocatalysts with efficient photocatalytic activity under visible light

“…The improved photocatalytic activity of semiconductor composites is attributed to a large extent to the enhanced separation of photoinduced electrons and holes via interfacial charge transfer [10,12,27e29]. Bismuth sulfide (Bi 2 S 3 ) is a semiconductor with a narrow band gap about 1.3 eV [30]. The narrow band gap and large absorption coefficient make it an ideal candidate for photoresponsive materials [31e33].…”

Au nanoparticle-decorated ultrathin CdS nanowires for high-efficiency photodegradation of organic dyes

“…5a. Gold nanoparticles have strong absorption peak among 510-600 nm (determined by the size, shape of Au NPs) due to surface plasmon resonance (SPR) [12,32,33]. The Au NPs-CdS NWs hybrids exhibit a broadened and redshift absorption peak comparing to Au NPs.…”

“…The Au NPs-CdS NWs hybrids exhibit a broadened and redshift absorption peak comparing to Au NPs. The change is a sign that Au-CdS have formed well in metal-semiconductor heterostructure, because high dielectric coefficient and exciton-plasmon coupling of CdS can change the SPR peak of Au NPs [33,34]. For 20 nm Au NPs-CdS NWs hybrids with different amounts of Au NPs, the absorption of light (400-700 nm) is enhanced with the increase in the amount of Au NPs.…”

“…The exploration in the mechanism involves the transfer of photoinduced charges [10,11], the status of the Fermi level of the photocatalyst [12] and the mold of the reaction (oxidation [13] or reduction [14,15]), providing us new views on photocatalysis and contributing to the deep understanding of photocatalysis. The exploration in the composition and structure of photocatalyst optimizes the parameters resulting in the improvement of the photocatalytic efficiency [16,17]. Of all the photocatalyst, CdS attracts tremendous attention due to the appropriate band gap (*2.4 eV) which is in accordance well with sunlight spectra [18].…”

Au-Edged CuZnSe2Heterostructured Nanosheets with Enhanced Electrochemical Performance

“…[11][12][13] Reasonable design of heterostructure prototypes has been devoted to developing next generation photoelectric and photovoltaic devices from a single NC. [14][15][16][17][18] However, limited research has been demonstrated on heterostructured NCs as ORR electrocatalysts. On the contrary, impelled by the advantages shown by low-dimensional quantum confi nement effects, [19][20][21][22][23] a variety of core-shell, dumb-bell, striped, and match-stick heterostructured NCs have been synthesized via colloidal chemistry routes in the past 15 years.…”