Abstract
HighlightsControllable and large-scale practical growth of plasmonic Ag-decorated vertically aligned 2D MoS2 nanosheets on graphene.Realization of the synergistic effects of surface plasmon resonance and favorable graphene/MoS2 heterojunction to enhance the photoelectrochemical reactivity of 2D MoS2.
Highlights
Photoelectrochemistry (PEC) and photocatalysis of semi‐ conductors have been extensively studied as effective approaches for energy conversion, such as hydrogen gas production by water splitting, and for environmental appli‐ cations, such as air/water purification, water disinfection, and hazardous waste remediation [1,2,3,4,5,6,7]
Owing to the low-temperature growth at 250 °C, the graphene layer remained after the metalorganic chemical vapor deposition (MOCVD) growth of MoS2, as confirmed by the presence of the char‐ acteristic G and 2D band peaks in the Raman spectrum
Plasmonic Ag-decorated vertically aligned few-layer MoS2 nanosheets were prepared on graphene in a practical man‐ ner through MOCVD of MoS2 and thermal evaporation of Ag
Summary
Photoelectrochemistry (PEC) and photocatalysis of semi‐ conductors have been extensively studied as effective approaches for energy conversion, such as hydrogen gas production by water splitting, and for environmental appli‐ cations, such as air/water purification, water disinfection, and hazardous waste remediation [1,2,3,4,5,6,7]. Vertically packed 2D sheets offer higher volume than laid sheets for interacting with incoming photon flux on a unit substrate area He et al demonstrated that the edge-on structure of MoS2 flakes/TiO2 nanowires improves the photocatalytic hydrogen evolution of MoS2 [11]. We reported the enhanced PEC activity of few-layer MoS2 nanosheets vertically grown on supporting electrode substrates, such as indium-tin oxide (ITO) and ITO/TiO2 nanowires [12, 13]. The synthesis and PEC applications of vertically aligned few-layer MoS2 nanosheets on graphene have not been reported despite its considerable potential. Aligned few-layer MoS2 nanosheets on graphene can act as desirable heterostructures to synergistically exploit the SPR effects in terms of energy band diagram and physical nanostructure architecture. Ag/MoS2 forms a low Schottky barrier, which is advantageous for the efficient injection of SPR-excited electrons into the conduction band of MoS2
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