Modulation and Improvement on Separation of Photoinduced Charge Carriers in CdS−Metal Nanoheterostructures

Abstract

We demonstrate the feasibility of modulating and improving the separation of photoinduced charge carriers of CdS-M nanoheterostructures through partial replacement of S with two group 16 elements of larger atomic size, Se and Te. With the incorporation of Se or Te into the CdS nanowires (NWs), the defect states of the CdS NWs were effectively passivated, enabling a fuller extent of participation of the photoinduced electrons in the charge separation process, thus resulting in a more pronounced photoluminescence quenching and photocurrent depression for the CdS 1-x Se x and CdS 1-x Te x NWs. The present study provides a facile way of improving the photocatalytic efficiency of CdS through the improvement in retarding the recombination of photoinduced charge carriers.

Efficient electrostatic self-assembly of one-dimensional CdS–Au nanocomposites with enhanced photoactivity, not the surface plasmon resonance effect

“…[1][2][3][4][5][6][7][8][9][10][11][12] In particular, semiconductor nanowires (NWs) with high aspect ratio are particularly attractive for use in photocatalysis because their onedimensional structure offers large surface areas, high carrier mobility along the nanowires, markedly enhanced light absorption and scattering, and chemical and physical stability. An excellent solution to this problem is to inject metals [29][30][31][32][33][34][35][36][37] (Au, Pd, Pt, Ni, etc.) An excellent solution to this problem is to inject metals [29][30][31][32][33][34][35][36][37] (Au, Pd, Pt, Ni, etc.)…”

Ultrafast Exciton Dynamics in InGaN/GaN and Rh/Cr2O3 Nanoparticle-Decorated InGaN/GaN Nanowires

“…In the meantime, surface modification of semiconductors by noble metal NP has been found to improve the efficiency of photocatalysis as a result of the enhanced separation of photoexcited charge carriers [19][20][21][22] . For instance, well-controlled Pt NPs coated on Si NWs by atomic layer deposition (ALD) showed high solar-to-fuel conversion efficiency 21,23 .…”

Yolk–shell nanostructures: synthesis, photocatalysis and interfacial charge dynamics

“…Till now, various composite nanostructures have been proposed as the photocatalyst paradigm to construct superior photocatalytic systems. Representative examples are doped/ alloyed nanocrystals, [11][12][13][14][15][16] particle-decorated nanostructures, heterodimers, 41 core-shell nanocrystals, [42][43][44][45][46][47] and yolk-shell nanostructures. 48,49 Here, yolk-shell nanostructures stand for a newly emerging photocatalyst platform, which are composed of a movable core surrounded by a permeable shell with void space.…”