<i>In situ</i> fabrication of a direct <i>Z</i>-scheme photocatalyst by immobilizing CdS quantum dots in the channels of graphene-hybridized and supported mesoporous titanium nanocrystals for high photocatalytic performance under visible light

Tang, Ningmei; Li, Youji; Chen, Feitai; Han, Z. J.

doi:10.1039/c8ra08008a

Cited by 159 publications

(85 citation statements)

References 59 publications

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“…The oblique line data is obtained by our linear fitting process. According to the formula S Δλ/Δn and FOM S/FWHM, the sensitivity (S) and FOM of the silicon grating can be calculated (Chen et al, 2013;Cai et al, 2014;Tang et al, 2018;Wu et al, 2020;Chen et al, 2021c). According to the formula, we can find that the slope of the straight line is the S. The S of the absorption peaks at λ 1 and λ 2 are 2,500 nm/RIU and 3,000 nm/ RIU.…”

Section: Resultsmentioning

confidence: 99%

An Asymmetric Silicon Grating Dual-Narrow-Band Perfect Absorber Based on Dielectric-Metal-Dielectric Structure

Wei

et al. 2021

Front. Mater.

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With the exhaustion of world energy, new energy has become the most important content of each country’s development strategy. How to efficiently use solar energy has become a research hotspot in current scientific research. Based on surface plasmon resonance and Fabry-Perot (FP) cavity, this paper proposes a design method of asymmetric silicon grating absorber, and uses finite difference time domain (FDTD) method for simulation calculation. By adjusting the geometric parameters, the asymmetric silicon grating absorber realizes two narrow-band absorption peaks with absorption greater than 99% in the optical wavelength range of 3,000–5,000 nm, and the absorption peak wavelengths are λ1 = 3,780 nm and λ2 = 4,135 nm, respectively. When the electromagnetic wave is incident on the surface of the metamaterial, it will excite the plasmon resonance of the metal to form a surface plasmon (SP) wave. When the SP wave propagates along the x axis, the silicon grating can reflect the SP wave back and forth. When the frequency of the SP wave and the incident light are equal, it will cause horizontal FP coupling resonance, resulting in different resonance wavelengths. This paper also discusses the influence of geometric parameters, incident angle and polarization angle on the performance of silicon grating absorbers. Finally, the sensing performance of the structure as a refractive index sensor is studied. The absorber can be used for various spectral applications such as photon detection, optical filtering and spectral sensing.

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Section: Resultsmentioning

confidence: 99%

An Asymmetric Silicon Grating Dual-Narrow-Band Perfect Absorber Based on Dielectric-Metal-Dielectric Structure

Wei

et al. 2021

Front. Mater.

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“…Graphene is a hexagonal honeycomb material formed by densely packed carbon atoms on a twodimensional plane. It has outstanding optical, electrical, and mechanical properties, such as fast carrier mobility and high optical transparency [35][36][37][38]. In the far-infrared and terahertz band, a striking feature of graphene unlike traditional precious metals is that its surface plasmon resonance (SPR) has an extremely strong field confinement and lower ohmic loss.…”

Section: Introductionmentioning

confidence: 99%

A Tunable “Ancient Coin”-Type Perfect Absorber with High Refractive Index Sensitivity and Good Angular Polarization Tolerance

Luo

Shangguan

et al. 2021

Coatings

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In this paper, we design and present a graphene-based “ancient coin”-type dual-band perfect metamaterial absorber, which is composed of a silver layer, silicon dioxide layer, and a top “ancient coin” graphene layer. The absorption performance of the absorber is affected by the hollowed-out square in the center of the graphene layer and geometric parameters of the remaining nano disk. The optical properties of graphene can be changed by adjusting the voltage, to control the absorption performance of the absorber dynamically. In addition, the centrally symmetric pattern structure greatly eliminates the polarization angle dependence of our proposed absorber, and it exhibits good angular polarization tolerance. Furthermore, the proposed “ancient coin”-type absorber shows great application potential as a sensor or detector in biopharmaceutical, optical imaging, and other fields due to its strong tunability and high refractive index sensitivity.

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“…This multi-resonance combination method can make multiple resonance absorption peaks in the spectrum overlap with each other. We end up with a wide absorption bandwidth [ 15 , 16 ]. However, the broadband of the absorber cannot be infinitely wide due to the influence of adjacent resonant arrays and the fact that an array of cells can only accommodate a limited combination of resonator stacks [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Broadband Solar Absorber Based on Square Ring cross Arrays of ZnS

Fang

et al. 2021

Micromachines

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Solar energy is an inexhaustible clean energy. However, how to improve the absorption efficiency in the visible band is a long-term problem for researchers. Therefore, an electromagnetic wave absorber with an ultra-long absorption spectrum has been widely considered by researchers of optoelectronic materials. A kind of absorbing material based on ZnS material is presented in this paper. Our purpose is for the absorber to achieve a good and wide spectrum of visible light absorption performance. In the wide spectrum band (553.0 THz–793.0 THz) of the absorption spectrum, the average absorption rate of the absorber is above 94%. Using surface plasmon resonance (SPR) and gap surface plasmon mode, the metamaterial absorber was studied in visible light. In particular, the absorber is insensitive to both electric and magnetic absorption. The absorber can operate in complex electromagnetic environments and at high temperatures. This is because the absorber is made of refractory metals. Finally, we discuss and analyze the influence of the parameters regulating the absorber on the absorber absorption efficiency. We have tried to explain why the absorber can produce wideband absorption.

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In situ fabrication of a direct Z-scheme photocatalyst by immobilizing CdS quantum dots in the channels of graphene-hybridized and supported mesoporous titanium nanocrystals for high photocatalytic performance under visible light

Abstract: CdS@GMT/GR exhibits high photocatalytic activity due to its direct Z-scheme structure obtained by immobilizing CdS quantum dots in the channels of GMT nanocrystals.

Cited by 159 publications

References 59 publications

An Asymmetric Silicon Grating Dual-Narrow-Band Perfect Absorber Based on Dielectric-Metal-Dielectric Structure

An Asymmetric Silicon Grating Dual-Narrow-Band Perfect Absorber Based on Dielectric-Metal-Dielectric Structure

A Tunable “Ancient Coin”-Type Perfect Absorber with High Refractive Index Sensitivity and Good Angular Polarization Tolerance

Broadband Solar Absorber Based on Square Ring cross Arrays of ZnS

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