Effect of annealing temperature on the structural and optical properties of ZnO thin films prepared by sol–gel method

Zhang, Yidong; Wang, Fa; Fu, Yang; Zheng, Zhi; Zhang, Pingyu

doi:10.1007/s11581-010-0468-4

Cited by 40 publications

(13 citation statements)

References 28 publications

(25 reference statements)

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“…Obviously, the grain size has increased with annealing temperature. This effect had been also observed elsewhere [26,27]. irradiation, corresponding to preferential c-axis orientated wurtzite type crystalline structure.…”

Section: Methodssupporting

confidence: 74%

Laser induced photoconductivity in sol–gel derived Al doped ZnO thin films

Eskandari

Ranjbar

Kameli

et al. 2015

Journal of Alloys and Compounds

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Section: Methodssupporting

confidence: 74%

Laser induced photoconductivity in sol–gel derived Al doped ZnO thin films

Eskandari

Ranjbar

Kameli

et al. 2015

Journal of Alloys and Compounds

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“…Annealing of ZnO nano-crystals at higher temperatures have been found to alter the concentrations of the defects at the crystal surface. [42][43][44] The room temperature PL spectra of ZnO NRs with various surface defect densities are shown in Fig. 4, where all the ZnO NR samples exhibited emission in UV and visible region.…”

Section: Role Of Surface Defects In Photocatalytic Activity Of Au-znomentioning

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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“…One effective way to modulate the concentration of defects in the ZnO lattice is to anneal the ZnO nanostructures in an oxygen-rich atmosphere. The effect of annealing on the native defects of ZnO has been studied extensively and it has been demonstrated that the crystallinity of ZnO can be improved by annealing the samples at higher temperatures, typically above 500 °C [16–20]. However, some studies show that annealing at higher temperatures can also introduce defects, such as oxygen interstitials in the ZnO lattice [21–22].…”

Section: Introductionmentioning

confidence: 99%

Modulation of defect-mediated energy transfer from ZnO nanoparticles for the photocatalytic degradation of bilirubin

Bora¹,

Lakshman²,

Sarkar³

et al. 2013

Beilstein J. Nanotechnol.

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SummaryIn recent years, nanotechnology has gained significant interest for applications in the medical field. In this regard, a utilization of the ZnO nanoparticles for the efficient degradation of bilirubin (BR) through photocatalysis was explored. BR is a water insoluble byproduct of the heme catabolism that can cause jaundice when its excretion is impaired. The photocatalytic degradation of BR activated by ZnO nanoparticles through a non-radiative energy transfer pathway can be influenced by the surface defect-states (mainly the oxygen vacancies) of the catalyst nanoparticles. These were modulated by applying a simple annealing in an oxygen-rich atmosphere. The mechanism of the energy transfer process between the ZnO nanoparticles and the BR molecules adsorbed at the surface was studied by using steady-state and picosecond-resolved fluorescence spectroscopy. A correlation of photocatalytic degradation and time-correlated single photon counting studies revealed that the defect-engineered ZnO nanoparticles that were obtained through post-annealing treatments led to an efficient decomposition of BR molecules that was enabled by Förster resonance energy transfer.

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Effect of annealing temperature on the structural and optical properties of ZnO thin films prepared by sol–gel method

Cited by 40 publications

References 28 publications

Laser induced photoconductivity in sol–gel derived Al doped ZnO thin films

Laser induced photoconductivity in sol–gel derived Al doped ZnO thin films

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

Modulation of defect-mediated energy transfer from ZnO nanoparticles for the photocatalytic degradation of bilirubin

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