Blue luminescent center in ZnO films deposited on silicon substrates

Fang, Zebo; Wang, Yinyue; Xu, Dongxiao; Tan, Yiqiu; Liu, Dage

doi:10.1016/j.optmat.2003.11.027

Cited by 204 publications

(64 citation statements)

References 16 publications

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“…TiO 2 nanomaterials possess commendable performance in terms of its nontoxic, cost effectiveness, strong oxidizing activity, and long-term stability against photocorrosion, which have a very broad application prospect in many fields, such as air pollution, waste water treatment, hydrogen production, and sterilization [2][3][4][5][6][7]. The application of TiO 2 nanomaterials is greatly limited due to the poor visible light response and high charge recombination rate, originating from the wide band gap (3.2 eV for anatase and 3.0 eV for rutile) and the relatively high electrical resistance.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Tang

Abas

Wang

2018

International Journal of Photoenergy

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TiO 2 /carbon fiber composite is achieved by loading TiO 2 nanoparticles on biomass carbon fiber, which originates from the carbonized natural bast. The carbonized process and the loading amount of TiO 2 are researched in detail. It is found that the carbonized bast fiber shows robust adsorption characteristics for TiO 2 nanoparticles in aqueous dispersion, and TiO 2 nanoparticles with~15 wt.% in total weight are uniformly loaded onto the fiber surface. The photocatalytic properties of TiO 2 /carbon fiber composite are evaluated by photocatalytic degradation of rhodamine B and water splitting for hydrogen production. The results indicate that 90% RhB molecules could be attacked in 60 min under UV light irradiation, and the hydrogen production rate of water splitting is up to 338.51 μmol/h. The highlight is that TiO 2 /carbon fiber composite is easy to be recycled due to the incorporation of macroscopical biomass carbon fiber.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Tang

Abas

Wang

2018

International Journal of Photoenergy

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“…The spectrum is fitted to Gaussian curve and is a combination of five peaks centred at 3.18 eV, 2.7 eV, 2.59 eV, 2.35 eV and 1.99 eV. Apart form the UV emission (3.18 eV) corresponding to near band edge, 16,18 visible emission in the blue region (2.7 eV), blue-green region (2.59 eV and 2.35 eV) and orange region (1.99 eV) are observed. The emissions in the visible region indicate the presence of high defect concentration in ZAF film.…”

mentioning

confidence: 99%

“…20,21 The broad emission centred on 2.35 eV is due to the antisite oxygen. 18 The weak orange emission around 1.99 eV is related to interstitial oxygen. 22 The antisite oxygen is induced due to the lattice distortion caused by incorporation of larger Fe ions in the ZnO lattice.…”

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confidence: 99%

Al and Fe co-doped transparent conducting ZnO thin film for mediator-less biosensing application

Saha

Gupta

2011

AIP Advances

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Highly c-axis oriented Al and Fe co-doped ZnO (ZAF) thin film is prepared by pulsed laser deposition. Fe introduces redox centre along with shallow donor level while Al doping enhances conductivity of ZnO, thus removing the requirement of both mediator and bottom conducting layer in bioelectrode. Model enzyme (glucose oxidase), was immobilized on surface of ZAF matrix. Cyclic voltammetry and photometric assay show that prepared bio-electrode is sensitive to glucose concentration with enhanced response of 0.18 μAmM-1cm-2 and low Km ∼ 2.01 mM. The results illustrate that ZAF is an attractive matrix for realization of miniaturized mediator-less solid state biosensor

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“…Thus, it is fair to conclude that the detraction of the band gap emission in ZnO nanocomposites is dominated by the natural fibers. The origin of the violet emission at ∼424 nm and 487 nm could be ascribed due to the transition occurring from Zn interstitials (Zn i ) to the valence band, and the peak of 424 nm may be the result of the singly ionized oxygen vacancy (Vo) [27,28]. Therefore, the PL peaks of the nanocomposites were observed close to ZnO.…”

Section: Sawdust-znomentioning

confidence: 99%

Optical and Structural Properties of Solvent Free Synthesized Starch/Chitosan-ZnO Nanocomposites

Sanmugam

Vikraman

Venkatesan

et al. 2017

Journal of Nanomaterials

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The objective of this work is to develop an environmentally friendly method for preparation of ZnO nanocomposites. ZnO nanocomposites were prepared by three natural fibers such as coir, sawdust, and chitosan using aqueous solution of zinc chloride and sodium hydroxide. The functional groups of ZnO, C=O for polysaccharide, and N-H bending vibration of amine were confirmed by FTIR spectroscopy. A new high intensity absorption band has been observed at 424 cm −1 which corresponds to the E 2 mode of hexagonal ZnO. The crystallinity and phase formation of coir, chitosan, and sawdust combined ZnO nanocomposites were confirmed by X-ray diffraction patterns. XRD patterns revealed the polycrystalline nature of ZnO composites belonging to the hexagonal phase with (101) preferential lattice orientation. The microstructural parameters were calculated for coir, chitosan, and saw wood combined ZnO composites. Also texture coefficients were estimated for all the diffraction lines of ZnO based nanocomposites. SEM and TEM analyses confirmed evenly distributed nanosized grains in the ZnO composites. The UV-Vis absorption spectra were observed where the blue shift absorption peak was at 334 nm. The optical band gap values were estimated in the range of 3.18-3.26 eV. The emission peak was observed at ∼388 nm and ∼463 nm by photoluminescence spectroscopy.

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Blue luminescent center in ZnO films deposited on silicon substrates

Cited by 204 publications

References 16 publications

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Al and Fe co-doped transparent conducting ZnO thin film for mediator-less biosensing application

Optical and Structural Properties of Solvent Free Synthesized Starch/Chitosan-ZnO Nanocomposites

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Blue luminescent center in ZnO films deposited on silicon substrates

Cited by 204 publications

References 16 publications

Photocatalytic Degradation and Hydrogen Production of TiO2/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Photocatalytic Degradation and Hydrogen Production of TiO2/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Al and Fe co-doped transparent conducting ZnO thin film for mediator-less biosensing application

Optical and Structural Properties of Solvent Free Synthesized Starch/Chitosan-ZnO Nanocomposites

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Product

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Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source