Enhanced visible light photocatalysis through fast crystallization of zinc oxide nanorods

Baruah, Sunandan; Mahmood, Mohammad Abbas; Myint, Myo Tay Zar; Bora, Tanujjal; Dutta, Joydeep

doi:10.3762/bjnano.1.3

Cited by 161 publications

(101 citation statements)

References 31 publications

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“…8 Initially the glass substrates were cleaned subsequently in soap water, acetone, ethanol and de-ionized (DI) water in an ultrasonic water bath. A ZnO seed layer was then deposited on the cleaned glass substrates by spraying 10 ml of 5 mM aqueous solution of zinc acetate at 350 °C.…”

Section: Synthesis Of Zno Nrsmentioning

confidence: 99%

“…In the presence of ZnO NRs, the photocatalytic degradation of MB was observed to occur at a faster rate resulting in almost 50% reduction in MB concentration in less than 40 minutes of visible light illumination. The enhancement in the photocatalytic activity of ZnO NRs under visible light irradiation is mainly due to the presence of the surface defects in the hydrothermally grown ZnO NRs, 8,28,29 which allows sub-bandgap absorption in the material, generating active e-h pairs by absorbing some part of the visible spectrum. 30,31 From the UV/Vis absorption spectra of ZnO NRs ( Fig.…”

Section: Photocatalytic Degradation Of Mb Using Au-zno Nrsmentioning

confidence: 99%

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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: Synthesis Of Zno Nrsmentioning

confidence: 99%

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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“…Microshape dependency shows that ZnO nanorods (NRs) have the best optical properties among nanoshells and nanoneedles [5]. In contrast, it has been also reported that enhanced surface defects play a crucial role in ZnO nanostructures when it is used as a visible light photocatalyst [6–9]. …”

Section: Introductionmentioning

confidence: 99%

Influence of Atomic Hydrogen, Band Bending, and Defects in the Top Few Nanometers of Hydrothermally Prepared Zinc Oxide Nanorods

et al. 2017

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We report on the surface, sub-surface (top few nanometers) and bulk properties of hydrothermally grown zinc oxide (ZnO) nanorods (NRs) prior to and after hydrogen treatment. Upon treating with atomic hydrogen (H*), upward and downward band bending is observed depending on the availability of molecular H2O within the structure of the NRs. In the absence of H2O, the H* treatment demonstrated a cleaning effect of the nanorods, leading to a 0.51 eV upward band bending. In addition, enhancement in the intensity of room temperature photoluminescence (PL) signals due to the creation of new surface defects could be observed. The defects enhanced the visible light activity of the ZnO NRs which were subsequently used to photocatalytically degrade aqueous phenol under simulated sunlight. On the contrary, in the presence of H2O, H* treatment created an electronic accumulation layer inducing downward band bending of 0.45 eV (~1/7th of the bulk ZnO band gap) along with the weakening of the defect signals as observed from room temperature photoluminescence spectra. The results suggest a plausible way of tailoring the band bending and defects of the ZnO NRs through control of H2O/H* species.

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“…Photocatalysis is a promising technology based on the interaction between light and solid semiconductor particles and is able to induced the oxidation process and produce highly oxidative species which, not only cause the damage and inactivate the organisms , but also destroy a large variety of chemical contaminants.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of Cotton Fabrics Treated With Poly (Vinyl Alcohol)/ZnO Nanocomposites, Photocatalyzed by UV Irradiation

Hassan

Ali

2017

Vinyl Additive Technology

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Cotton fabrics with antimicrobial properties were prepared by treatment with aqueous solutions of poly vinyl alcohol/zinc oxide (PVA/ZnO) nanocomposites and subsequently exposed to UV radiation. The ZnO nanoparticles, PVA/ZnO nanocomposite films, and treated cotton fabrics were characterized by transmission electron microscopy, Fourier transform infrared, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. The antibacterial finishing of the treated cotton fabrics was evaluated toward gram-positive and gram-negative bacteria. J. VINYL ADDIT. FIG. 3. The X-ray diffraction patterns of pure poly vinyl alcohol and poly vinyl alcohol/zinc oxide nanocomposite films. FIG. 4. Scanning electron microscopy of (a) untreated cotton fabrics, (b) poly vinyl alcohol/zinc oxide nanocomposite treated samples.

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Enhanced visible light photocatalysis through fast crystallization of zinc oxide nanorods

Cited by 161 publications

References 31 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

Influence of Atomic Hydrogen, Band Bending, and Defects in the Top Few Nanometers of Hydrothermally Prepared Zinc Oxide Nanorods

Antibacterial Activity of Cotton Fabrics Treated With Poly (Vinyl Alcohol)/ZnO Nanocomposites, Photocatalyzed by UV Irradiation

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