Au–ZnO: A tunable localized surface plasmonic nanocomposite

Mishra, Yogendra Kumar; Mohapatra, Satyabrata; Singhal, Rahul; Avasthi, D.K.; Agarwal, D. C.; Ogale, S. B.

doi:10.1063/1.2838302

Cited by 157 publications

(96 citation statements)

References 24 publications

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“…Compared to the bare ZnO NRs, which displayed lower optical absorption in the visible region (λ > 400 nm), the Au-ZnO NRs showed almost six times higher visible light absorption at ∼525 nm, which is characteristic of the surface plasmon resonance (SPR) absorption of Au NPs. 27 An absorption spectrum of colloidal Au NPs is also shown in the inset for comparison. Due to the strong scattering and local field enhancement of light by Au NPs in the near UV region, the absorption band of ZnO NRs in the Au-ZnO system was also observed to increase slightly.…”

Section: Photocatalytic Degradation Of Mb Using Au-zno Nrsmentioning

confidence: 99%

Role of surface defects on visible light enabled plasmonic photocatalysis in Au–ZnO nanocatalysts

et al. 2015

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Visible light photocatalytic activity of the plasmonic gold-zinc oxide (Au-ZnO) nanorods (NRs) is investigated with respect to the surface defects of the ZnO NRs, controlled by annealing the NRs in ambient at different temperatures. IntroductionPhotocatalysis by nanostructured metal oxides has been extensively explored in the past due to the potential application in controlling the environmental pollutants for complete mineralization. AbstractVisible light photocatalytic activity of the plasmonic gold-zinc oxide (Au-ZnO) nanorods (NRs) is investigated with respect to the surface defects of the ZnO NRs, controlled by annealing the NRs in ambient at different temperatures. Understanding the role of surface defects on the charge transfer behaviour across a metal-semiconductor junction is vital for efficient visible light active photocatalysis. Au nanoparticles (NPs) are in situ deposited on the surface of the ZnO NRs having different surface defect densities, demonstrating efficient harvesting of visible light due to the surface plasmon absorption. The surface defects in the ZnO NRs are probed by using photoluminescence (PL) spectroscopy, X-ray photoemission spectroscopy (XPS), and photo-electro-chemical current-voltage measurements to study the photo-generated charge transfer efficiency across the Au-ZnO Schottky interface. The results show that the surface situated oxygen vacancy sites in the ZnO NRs significantly reduce the charge transfer efficiency across the Au-ZnO Schottky interfaces lowering the photocatalytic activity of the system. Reduction in the oxygen vacancy sites through annealing the ZnO NRs resulted in the enhancement of visible light enabled photocatalytic activity of the Au-ZnO plasmonic nanocatalyst, adding vital insight towards the design of efficient plasmonic photocatalysts. rsc_RA_c5ra16569e higher surface-to-volume ratios resulting in improved catalytic activity compared to their bulk counterparts. Metal oxides, for example, titanium dioxide (TiO 2 ), zinc oxide (ZnO), etc. are commonly used as photocatalysts, and are typically active under ultra-violet (UV) light due to their wide band gap energies. In recent times, designing photocatalysts that can be activated by visible light is one of the major research areas in order to efficiently and cost-effectively utilize them using the sunlight. Activation of wide bandgap metal oxide photocatalysts under visible light irradiation can be achieved in various ways, among which doping with transition metals, 4-6 creating intermediate defects, 7,8 sensitizing with visible light active dyes or other semiconductors materials, 9-11 narrow bandgap semiconductor coupling 12-14 etc. are some of the commonly used methods.Sensitizing the metal oxide photocatalysts with noble metal NPs to harvest visible light utilizing the surface plasmon resonance (SPR) absorption of the metallic NPs, and hence the name plasmonic photocatalysis, is emerging as a new area for designing smart photocatalysts. 15,16 Plasmonic photocatalysis typically involves distribution of ...

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Section: Photocatalytic Degradation Of Mb Using Au-zno Nrsmentioning

confidence: 99%

Role of surface defects on visible light enabled plasmonic photocatalysis in Au–ZnO nanocatalysts

et al. 2015

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“…We also conclude that majority of Eu 3+ ions are doped into the ZnO lattice, since no diffraction peaks from europium related compounds were observed. The strongest diffraction peak originates from the preferred (101) orientation [15]. It is also worth noting that positions of main diffraction peaks of Eudoped ZnO samples are slightly shifted to lower angles compared to the diffraction patterns of undoped ZnO.…”

Section: Structural Propertiesmentioning

confidence: 91%

The Effect of Synthesis Pressure on Properties of Eu-Doped ZnO Nanopowders Prepared by Microwave Hydrothermal Method

et al. 2016

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In the current research, europium doped ZnO nanopowders prepared by a microwave hydrothermal method are investigated. The effects of synthesis pressure on the morphologies, crystal structures, and optical properties of Eu-doped ZnO were analyzed by scanning electron microscopy, X-ray diffraction, cathodo-and photoluminescence. From our investigations it can be concluded that the synthesis pressure strongly influences the surface morphology. With the increase of the synthesis pressure from 2 MPa to 10 MPa significant changes can be observed. An increase of the mean crystallites sizes and change of the intensity ratio between the near band edge and defect related deep level emission band of ZnO were observed.

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“…When the diameter of gold NPs is relatively small, growth of ZnO nanorods occurs (Figure 1(a)) with NPs on the top; however, if the particle diameter is large enough formation of nanoSail type structures takes place as shown in Figures 1(b) to 1(d) with increasing order of magnifications. For instance, fabrication details of nanorods and nanoSails are described in our previous works [11,23] whereas the corresponding electron microscopy images are shown in Figure 1.…”

Section: Vls and Modified Vls Approachesmentioning

confidence: 99%

Procedures and Properties for a Direct Nano-Micro Integration of Metal and Semiconductor Nanowires on Si Chips

Gedamu

Paulowicz

Jebril

et al. 2012

Journal of Nanotechnology

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1-dimensional metal and semiconductor nanostructures exhibit interesting physical properties, but their integration into modern electronic devices is often a very challenging task. Finding the appropriate supports for nanostructures and nanoscale contacts are highly desired aspects in this regard. In present work we demonstrate the fabrication of 1D nano-and mesostructures between microstructured contacts formed directly on a silicon chip either by a thin film fracture (TFF) approach or by a modified vaporliquid-solid (MVLS) approach. In principle, both approaches offer the possibilities to integrate these nano-meso structures in wafer-level fabrications. Electrical properties of these nano-micro structures integrated on Si chips and their preliminary applications in the direction of sensors and field effect transistors are also presented.

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Au–ZnO: A tunable localized surface plasmonic nanocomposite

Cited by 157 publications

References 24 publications

Role of surface defects on visible light enabled plasmonic photocatalysis in Au–ZnO nanocatalysts

Role of surface defects on visible light enabled plasmonic photocatalysis in Au–ZnO nanocatalysts

The Effect of Synthesis Pressure on Properties of Eu-Doped ZnO Nanopowders Prepared by Microwave Hydrothermal Method

Procedures and Properties for a Direct Nano-Micro Integration of Metal and Semiconductor Nanowires on Si Chips

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