Research on the direct doping effect of silicon on cubic boron nitride ceramics by UV–VIS diffuse reflectance

Wang, P.F.; Li, Zh.H.; Zhu, Yumei

doi:10.1016/j.matchemphys.2010.05.050

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…where R 1 is the diffuse reflectance of the examined samples (R 1 = R sample /R standard ) and F(R 1 ) is called the remission or Kubelka-Munk function [31,32]. Thus, the band gap is obtained using the following equation:…”

Section: Optical Propertiesmentioning

confidence: 99%

Influence of sodium dodecyl sulfate concentration on the photocatalytic activity and dielectric properties of intercalated sodium dodecyl sulfate into Zn–Cd–Al layered double hydroxide

Ahmed

Talib

Hussein

2015

Materials Research Bulletin

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Section: Optical Propertiesmentioning

confidence: 99%

Influence of sodium dodecyl sulfate concentration on the photocatalytic activity and dielectric properties of intercalated sodium dodecyl sulfate into Zn–Cd–Al layered double hydroxide

Ahmed

Talib

Hussein

2015

Materials Research Bulletin

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“…A função KM é diretamente proporcional ao coeficiente de absorção α [30], e este está diretamente relacionado à energia do fóton incidente conforme a Equação 2 [31][32][33]:…”

Section: Kinunclassified

“…O α pode ser substituído pelo coeficiente de absorção difusa, F (R), por intermédio da função KM em termos de refletância, obtendo-se a Equação 3 [33]:…”

Section: Kinunclassified

“…As micrografias das amostras de KIN e KC (Figura 5-a,d) evidenciam uma morfologia mais definida, na forma de cristais pseudo-hexagonais, que se sobrepõem e são característicos da caulinita e metacaulinita. Já as amostras tratadas com ácido (Figura 5-b,c,e,f) apresentam um aspecto de flocos com bordas irregulares e se agrupam formando placas [33,35]. Em se tratando das imagens das amostras KINT, KINPT, KINST, KCT, KCPT e KCST (Figura 5 g-l) não houve grandes alterações na morfologia quando comparadas com as amostras precursoras sem a incorporação do titânio.…”

Section: Microscopia Eletrônica De Varredura (Mev) E Espectroscopia De Energia Dispersiva (Eds)unclassified

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Síntese e caracterização de nanocompósitos de caulinita e TiO2 utilizando o método dos precursores poliméricos

et al. 2021

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RESUMO No presente trabalho, utilizou-se a caulinita como material base para a obtenção de materiais nanocompósitos. A caulinita foi utilizada na forma in natura, tratada termicamente à 700 ºC e quimicamente com ácidos fosfórico e sulfúrico na concentração de 6 mol L-1. O objetivo dos tratamentos foi modificar e preparar a estrutura da caulinita para ser usada como um suporte para o TiO2. Por meio do método dos precursores poliméricos foi sintetizado o TiO2 e nanocompósitos à base de caulinita e TiO2. Os nanomateriais foram caracterizados por Difratometria de Raios X (DRX), UV-Vis, para determinar o Bandgap, Espectroscopia na Região do Infravermelho com Transformada de Fourier (FTIR), Microscopia Eletrônica de Varredura (MEV) e Espectroscopia de Energia Dispersiva (EDS). Por meio dos espectros de FTIR foi possível verificar as bandas características da caulinita in natura e o aparecimento de vibrações características da metacaulinita. A análise de DRX revelou que foi possível promover o aumento da cristalinidade das amostras de caulinita após tratamento com o citrato de titânio, isto pode ser decorrente da adesão do óxido de titânio na superfície da caulinita. Pela análise de EDS foi possível determinar a porcentagem de Ti (m/m) nas amostras sintetizadas, sendo que seu valor ficou entre 2,03 e 4,16 %. As análises por ICP-OES indicam que as amostras apresentam de 2,65 a 4,07% de Ti e os dados do Bandgap variam de 1,69 a 3,44 eV para as amostras com e sem Ti em sua composição.

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“…where ∞ is the diffuse reflectance of the examined samples ( ∞ = sample / standard ) and ( ∞ ) is called the remission or Kubelka-Munk function [12,13]. Thus, the band gap is obtained using the following equation:…”

Section: Uv-visible Spectramentioning

confidence: 99%

Influence of Zn/Fe Molar Ratio on Optical and Magnetic Properties of ZnO and ZnFe₂O₄Nanocrystal as Calcined Products of Layered Double Hydroxides

Ahmed

Talib

Hussein

et al. 2014

Journal of Spectroscopy

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The coprecipitation method has been used to synthesize layered double hydroxide (Zn-Fe-LDH) nanostructure at different Zn2+/Fe3+molar ratios. The structural properties of samples were studied using powder X-ray diffraction (PXRD). LDH samples were calcined at 600°C to produce mixed oxides (ZnO and ZnFe2O4). The crystallite size of mixed oxide was found in the nanometer scale (18.1 nm for ZnFe2O4and 43.3 nm for ZnO). The photocatalytic activity of the calcination products was investigated using ultraviolet-visible-near infrared (UV-VIS-NIR) diffuse reflectance spectroscopy. The magnetic properties of calcined LDHs were investigated using a vibrating sample magnetometer (VSM). The calcined samples showed a paramagnetic behavior for all Zn2+/Fe3+molar ratios. The effect of molar ratio on magnetic susceptibility of the calcined samples was also studied.

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Research on the direct doping effect of silicon on cubic boron nitride ceramics by UV–VIS diffuse reflectance

Cited by 8 publications

References 18 publications

Influence of sodium dodecyl sulfate concentration on the photocatalytic activity and dielectric properties of intercalated sodium dodecyl sulfate into Zn–Cd–Al layered double hydroxide

Influence of sodium dodecyl sulfate concentration on the photocatalytic activity and dielectric properties of intercalated sodium dodecyl sulfate into Zn–Cd–Al layered double hydroxide

Síntese e caracterização de nanocompósitos de caulinita e TiO2 utilizando o método dos precursores poliméricos

Influence of Zn/Fe Molar Ratio on Optical and Magnetic Properties of ZnO and ZnFe₂O₄Nanocrystal as Calcined Products of Layered Double Hydroxides

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Research on the direct doping effect of silicon on cubic boron nitride ceramics by UV–VIS diffuse reflectance

Cited by 8 publications

References 18 publications

Influence of sodium dodecyl sulfate concentration on the photocatalytic activity and dielectric properties of intercalated sodium dodecyl sulfate into Zn–Cd–Al layered double hydroxide

Influence of sodium dodecyl sulfate concentration on the photocatalytic activity and dielectric properties of intercalated sodium dodecyl sulfate into Zn–Cd–Al layered double hydroxide

Síntese e caracterização de nanocompósitos de caulinita e TiO2 utilizando o método dos precursores poliméricos

Influence of Zn/Fe Molar Ratio on Optical and Magnetic Properties of ZnO and ZnFe2O4Nanocrystal as Calcined Products of Layered Double Hydroxides

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Product

Resources

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Influence of Zn/Fe Molar Ratio on Optical and Magnetic Properties of ZnO and ZnFe₂O₄Nanocrystal as Calcined Products of Layered Double Hydroxides