Theoretical and experimental investigations of the thermoelectric properties of Al-, Bi- and Sn-doped ZnO

Guan, Weibao; Zhang, Liying; Wang, Chao; Wang, Yuanxu

doi:10.1016/j.mssp.2017.03.027

Cited by 50 publications

(15 citation statements)

References 39 publications

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“…A Figura 2 apresenta o difratograma do produto da síntese hidrotermal assistida por microondas do óxido de zinco e seus diferentes tempos (5,10 e 20 minutos) no processo do microondas. Conforme a análise dos resultados confirmou-se o tipo de estrutura wurtzita pela fase hexagonal do óxido de zinco [2,11,[25][26][27][28]. Sendo confirmado, conforme [4], fortes picos de difração aparecendo em 2θ = 31.8°,34.3° e 36.5°, correspondendo aos planos (100), (002) e (101).…”

Section: Resultados E Discussõesunclassified

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

2018

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____________________________________________________________________________________________________________ RESUMOO óxido de zinco devido à presença de defeitos intrínsecos possibilita a dopagem com outros materiais, como o bismuto. O BZO (óxido de zinco dopado com bismuto) preparado via síntese hidrotermal assistida por microondas (MAHS) foi estudado por sua concentração de dopante e caracterização morfológica. Os produtos foram caracterizados DRX, MEV e PL; Cálculos de banda gap por espectroscopia de transmissão. Os resultados indicam que as nanoestruturas de BZO foram obtidas com tamanhos de cristalitos variando de 5,82 a 8,37 nm. A mesma estrutura morfológica, tipo flor, foi formada com diferentes concentrações de dopantes. PL demonstra que os defeitos aumentam com a dopagem do bismuto. O intervalo de band gap encontrado foi de 2,79-3,3 eV e tem potencial uso em aplicações de fotodegradação.

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Section: Resultados E Discussõesunclassified

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

2018

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“…Speculated from this, solid solution doping reduced the crystallinity of the particles, forming defect energy level in the energy gap. 30 When dispersed in epoxy resin, abundant dangling bonds and unsaturated bonds in X-ZnO SSs facilitated the superior tightness of the modified corrosion coating.…”

Section: Resultsmentioning

confidence: 99%

“…Followed by the eq , the crystallinity of pure ZnO and X-ZnO SSs was calculated to be 99.21%, 96.65%, 98.80%, and 98.12%, respectively. where I a and I c represented the amorphous phase and the cumulative diffraction intensity of the crystalline phase, the constant k here is usually equal to 1. Speculated from this, solid solution doping reduced the crystallinity of the particles, forming defect energy level in the energy gap . When dispersed in epoxy resin, abundant dangling bonds and unsaturated bonds in X-ZnO SSs facilitated the superior tightness of the modified corrosion coating.…”

Section: Resultsmentioning

confidence: 99%

Eminently Enhanced Anticorrosion Performance and Mechanisms of X-ZnO (X = C, N, and P) Solid Solutions

2017

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Nonmetal (C, N, P) doped zinc oxide solid solutions (ZnO SSs) prepared through one-step calcination method exhibited novel anticorrosion capability. The anticorrosion property was identified by electrochemical impedance spectroscopy and polarization curve technique. The maximal impedance belonged to C-ZnO SS, which was 12 times higher than pure ZnO materials. Then, a synergistic anticorrosion mechanism was proposed: the photoelectron flow suppression effect and the self-cohering process formed by doping. The tiny particle size as well as the minor zeta-potential of X-ZnO SSs eminently promoted the intermolecular cohesion and the formation of the compact surface automatically. Moreover, the photocatalytic experiments successfully verified the product and the corrosion inhibition effectiveness of the photoelectrons. Additionally, a positive correlation conclusion between the anticorrosion performance and the photocatalytic performance of the X-ZnO SSs was obtained. Consequently, developing the self-cohering anticorrosion materials is of crucial industrial application prospect and value.

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“…The improvement in photocatalytic performance of ZnO has been investigated by adjusting preparation conditions, 27,28 morphology, 7 particle size, 29 dopant agent, 15,16 and crystallinity. 30 Previous studies have shown that the photocatalytic activity of a photocatalyst is seriously dependent on decreasing the particle size and increasing the degree of crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Application of the Taguchi approach to optimize ZnO synthesis via hydrothermally assisted sol-gel method

Khaghanpour¹,

Naghibi²

2018

Turk J Chem

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ZnO powder was synthesized via a hydrothermally assisted sol-gel method. Synthesis variables including Znprecursor type, pH value, time, and temperature of hydrothermal treatment were analyzed using the Taguchi approach.The experimental procedures were defined based on the L9 array for four variables in three levels. The influences of those variables on the response parameters, i.e. crystallite size, crystallinity, band gap energy ( Eg) , and degradation constants ( k) , were evaluated. XRD results and Eg values showed that ZnO wurtzite appeared to be the only crystalline phase in the samples. Taguchi analysis predicted that the optimized conditions to achieve the highest photoactivity are as follows: Zn-precursor = zinc acetate, pH = 8, t = 2 h, and T = 150 • C. The optimized sample was synthesized based on the mentioned conditions and characterized. The obtained results confirmed the prediction of the Taguchi method and the highest k value was observed.

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Theoretical and experimental investigations of the thermoelectric properties of Al-, Bi- and Sn-doped ZnO

Cited by 50 publications

References 39 publications

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

Síntese hidrotermal assistida por microondas do óxido de zinco dopado com bismuto e sua caracterização

Eminently Enhanced Anticorrosion Performance and Mechanisms of X-ZnO (X = C, N, and P) Solid Solutions

Application of the Taguchi approach to optimize ZnO synthesis via hydrothermally assisted sol-gel method

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