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Solid state dewetting of thin plasmonic films under focused cw-laser irradiation
Elevated temperatures and large thermal gradients are a significant source of component failure in microelectronics, and is the limiting factor in heat-assisted magnetic recording (HAMR). Here, we have investigated the effect of solid-state dewetting in Au thin films, as a function of local temperature, film thickness, and substrate adhesion. In this work, a localised temperature rise is induced in thin (≤ 50 nm) polycrystalline Au films on SiO 2 substrates via focused continuous-wave laser irradiation at 488 nm. The magnitude and distribution of the total temperature rise is measured using CCD-based thermoreflectance. This also allows a sensitive measurement of the temperature at which dewetting occurs, showing that for thin (≤ 50 nm) Au films without adhesion layers, rapid dewetting can occur at temperatures as low as 50° C. The time decay of the reflected light from the illuminating laser is used to monitor locally the dynamics of solid state dewetting. TEM diffraction analysis shows significant changes in the microstructure and crystallographic texture of the films as far as 10 µm away from the illuminated area. The use of a thin metallic adhesion layer (such as Ti or Cr) is shown to significantly improve the adhesion of the Au to the substrate and reduce the tendency towards dewetting, but does not entirely protect it from changes to the crystallographic texture.
Electrically driven plasmon-exciton coupled random lasing in ZnO metal-semiconductor-metal devices
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Rapid determination of plasmonic nanoparticle agglomeration status in blood
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Surface plasmon resonance technique for directly probing the interaction of DNA and graphene oxide and ultrasensitive biosensing
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Important Considerations in Plasmon-Enhanced Electrochemical Conversion at Voltage-Biased Electrodes
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Molecular beam epitaxy grown indium self-assembled plasmonic nanostructures
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Plasmon-enhanced sub-Debye-length nanogap photoelectrochemical cells for field-assisted electrolyte-free water splitting
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Novel synthesis of plasmonic Bi{sub 2}Sn{sub 2}O{sub 7}/Ag-AgCl nanocomposite with enhanced visible light photocatalytic property
Highlights: • Stable Bi{sub 2}Sn{sub 2}O{sub 7}/Ag/AgCl composite is prepared by an easy-completing method for the first time. • The Bi{sub 2}Sn{sub 2}O{sub 7}/Ag/AgCl composite has remarkably enhanced photocatalytic activity under visible light irradiation. • The enhanced photocatalytic activity is attributed to enhanced visible-light absorption and high separation efficiency of electron-hole pairs. • The possible mechanism of photocatalysis enhancement is investigated and illustrated. - Abstract: We report a novel Bi{sub 2}Sn{sub 2}O{sub 7}/Ag-AgCl photocatalysts with excellent visible-light-driven photocatalytic properties. The crystalline Bi{sub 2}Sn{sub 2}O{sub 7} was synthesized by solid-state reaction at 550 °C. Then Bi{sub 2}Sn{sub 2}O{sub 7}/Ag-AgCl was prepared using deposition-precipitation technique followed by photo-reduction of partial Ag{sup +} to Ag{sup 0} nanoparticles on surface of AgCl. The photocatalysis were evaluated by degrading organic dyes under controlled conditions. The Bi{sub 2}Sn{sub 2}O{sub 7}/Ag-AgCl composite exhibited a much improved photocatalysis, approximately 7 times stronger than that of pure Bi{sub 2}Sn{sub 2}O{sub 7}, primarily due to its enhanced visible-light absorption and high separation efficiency of charge. On the basis of band structure analysis, a possible mechanism of photocatalysis enhancement for Bi{sub 2}Sn{sub 2}O{sub 7}/Ag-AgCl is proposed. The strong photocatalytic capability, together with simplicity of fabrication suggests Bi{sub 2}Sn{sub 2}O{sub 7}/Ag-AgCl composite provided in this study may have certain practical applications in water treatments. Additionally, the study implies a novel but simple methodology that may be also applicable in construction of other types of single semiconductor/plasmonic composite photocatalysts.