Photoluminescence and photocatalytic properties of rhombohedral CuGaO2 nanoplates

Shi, Linlin; Wang, Fei; Wang, Yunpeng; Wang, Dengkui; Zhao, Bin; Zhang, Ligong; Zhao, Dongxu; Shen, Dezhen

doi:10.1038/srep21135

Cited by 40 publications

(24 citation statements)

References 31 publications

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“…Recent reports have demonstrated that post processing of ZnO or heterostructure formation enhanced photocatalytic activity due to reduction in surface/bulk defects and improved charge separation [14,15]. This was also correlated with the photoluminescence response but with inconsistent conclusions; reduction [30,63,64] and increase [22,38] in the NBE emission were both related to an enhancement in photocatalytic activity. The PL, XPS and RhB photodegradation allowed us to conclude that in order to obtain a better efficiency, charge separation should be effective (high band bending) which is correlated to the PL emission diminution but also to non-radiative recombination across NiO layer should be avoided by increasing the width of the space charge layer.…”

Section: Pollutant Degradationmentioning

confidence: 99%

Influence of ZnO Surface Modification on the Photocatalytic Performance of ZnO/NiO Thin Films

et al. 2019

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Charge carrier separation is considered as a key factor in enhancing the photocatalytic process and can be maximized by mitigating surface recombination. Following this idea, the surface of zinc oxide (ZnO) was modified by thermal treatment and nickel oxide (NiO) deposition. The influence of the ZnO thermal treatment and NiO deposition conditions on the ZnO surface chemistry and heterostructure interface properties were investigated by in situ X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) and correlated to the dye photodegradation efficiency. The XPS analysis confirmed a change of doping of ZnO after thermal treatment, which mainly influenced the developed band bending, and has led to an improved photocatalytic activity. For the same reason, the heterostructures based on the surface cleaned ZnO surface had higher photocatalytic efficiency than the ones based on non-cleaned ZnO. The temperature input during NiO deposition had negligible effect on the heterostructure interface properties. The photocatalytic efficiency did not follow the band bending evolution because of a dominant contribution of charge recombination across the NiO layer as indicated by PL analysis.

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Section: Pollutant Degradationmentioning

confidence: 99%

Influence of ZnO Surface Modification on the Photocatalytic Performance of ZnO/NiO Thin Films

et al. 2019

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“…Nanoplates of CuGaO 2 synthesized via low temperature hydrothermal method exhibited a blue emission at room temperature and free exciton emission at low temperature. P-N junction fabricated by these nanoparticles of p-type CuGaO 2 and n-type nano ZnO exhibited enhanced photocatalytic activity and light absorption properties [26]. Investigation of structural and vibrational behavior of CuAlO 2 as a function of particle size shows the expansion of lattice parameters and the cell volume with the reduction of particle size.…”

Section: Introductionmentioning

confidence: 96%

Copper Delafossites under High Pressure—A Brief Review of XRD and Raman Spectroscopic Studies

Garg

Rao

2018

Crystals

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Delafossites, with a unique combination of electrical conductivity and optical transparency constitute an important class of materials with their wide range of applications in different fields. In this article, we review the high pressure studies on copper based semiconducting delafossites with special emphasis on their structural and vibrational properties by synchrotron based powder X-ray diffraction and Raman spectroscopic measurements. Though all the investigated compounds undergo pressure induced structural phase transition, the structure of high pressure phase has been reported only for CuFeO 2 . Based on X-ray diffraction data, one of the common features observed in all the studied compounds is the anisotropic compression of cell parameters in ambient rhombohedral structure. Ambient pressure bulk modulus obtained by fitting the pressure volume data lies between 135 to 200 GPa. Two allowed Raman mode frequencies E g and A 1g are observed in all the compounds in ambient phase with splitting of E g mode at the transition except for CuCrO 2 where along with splitting of E g mode, A 1g mode disappears and a strong mode appears which softens with pressure. Observed transition pressure scales exponentially with radii of trivalent cation being lowest for CuLaO 2 and highest for CuAlO 2 . The present review will help materials researchers to have an overview of the subject and reviewed results are relevant for fundamental science as well as possessing potential technological applications in synthesis of new materials with tailored physical properties.

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“…For example, the band gaps of CuGaO 2 are 1.47 eV and 3.53 eV with hexagonal and rhombohedral delafossite crystal structure, respectively. 30,31 In summary, the band gap of GaON has been tuned in a wide range from 4.8 eV to 2.05 eV continually with a two-step nitridation method performed on as-deposited amorphous thin films. With the increase of NT, the amorphous samples crystallized into GaON ternary alloys with hexagonal structure.…”

mentioning

confidence: 99%

Band gap engineering of N-alloyed Ga2O3 thin films

Song

Li²,

et al. 2016

AIP Advances

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The authors report the tuning of band gap of GaON ternary alloy in a wide range of 2.75 eV. The samples were prepared by a two-step nitridation method. First, the samples were deposited on 2-inch fused silica substrates by megnetron sputtering with NH3 and Ar gas for 60 minutes. Then they were annealed in NH3 ambience at different temperatures. The optical band gap energies are calculated from transmittance measurements. With the increase of nitridation temperature, the band gap gradually decreases from 4.8 eV to 2.05 eV. X-ray diffraction results indicate that as-deposited amorphous samples can crystallize into monoclinic and hexagonal structures after they were annealed in oxygen or ammonia ambience, respectively. The narrowing of the band gap is attributed to the enhanced repulsion of N2p -Ga3d orbits and formation of hexagonal structure.

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Photoluminescence and photocatalytic properties of rhombohedral CuGaO2 nanoplates

Cited by 40 publications

References 31 publications

Influence of ZnO Surface Modification on the Photocatalytic Performance of ZnO/NiO Thin Films

Influence of ZnO Surface Modification on the Photocatalytic Performance of ZnO/NiO Thin Films

Copper Delafossites under High Pressure—A Brief Review of XRD and Raman Spectroscopic Studies

Band gap engineering of N-alloyed Ga2O3 thin films

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