SnO2, ZnO and related polycrystalline compound semiconductors: An overview and review on the voltage-dependent resistance (non-ohmic) feature

Bueno, Paulo Roberto; Varela, José Arana; Longo, Elson

doi:10.1016/j.jeurceramsoc.2007.06.011

Cited by 265 publications

(153 citation statements)

References 139 publications

Supporting

Mentioning

149

Contrasting

Unclassified

Order By: Relevance

“…This II-IV semiconductor presents a wide band-gap (3.37 eV at room temperature), and a large exciton binding energy (60 meV), and is, therefore, one of the most promising candidates for room temperature UV lasers and short-wavelength optoelectronic devices. Some detailed reviews have been published previously, dedicated to ZnO synthesis [6], electronic properties [7], varistor applications [8], quantum dots [9] and photonic devices [10], all of which show the constant interest of scientists wanting to improve its properties in various fields [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Sintering of ZnO Nanopowders

et al. 2017

View full text Add to dashboard Cite

Nanopowders are continuously under investigation as they open new perspectives in numerous fields. There are two main challenges to stimulating their development: sufficient low-cost, high throughput synthesis methods which lead to a production with well-defined and reproducible properties; and for ceramics specifically, the conservation of the powders' nanostructure after sintering. In this context, this paper presents the synthesis of a pure nanosized powder of ZnO (dv 50~6 0 nm, easily redispersable) by using a continuous Segmented Flow Tubular Reactor (SFTR), which has previously shown its versatility and its robustness, ensuring a high powder quality and reproducibility over time. A higher scale of production can be achieved based on a "scale-out" concept by replicating the tubular reactors. The sinterability of ZnO nanopowders synthesized by the SFTR was studied, by natural sintering at 900 • C and 1100 • C, and Spark Plasma Sintering (SPS) at 900 • C. The performance of the synthesized nanopowder was compared to a commercial ZnO nanopowder of high quality. The samples obtained from the synthesized nanopowder could not be densified at low temperature by traditional sintering, whereas SPS led to a fully dense material after only 5 min at 900 • C, while also limiting the grain growth, thus leading to a nanostructured material.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Sintering of ZnO Nanopowders

et al. 2017

View full text Add to dashboard Cite

show abstract

“…6 or for the model without Rs resistance, as reported in the literature [19]. Other more complex models, which incorporate the influence of charge densities in the grains associated with the thickness of the intergranular layer, have been reported [20]. Fig.…”

Section: Resultsmentioning

confidence: 86%

Electrical and microstructural properties of microwave sintered SnO2-based varistors

et al. 2012

View full text Add to dashboard Cite

An investigation was made of the microstructural and electrical properties of SnO 2 -based varistors microwave sintered at 1200 ºC, applying a heating rate of 120 ºC/min and treatment times of 10, 20, 30, 40, 50 and 60 min. The system used in this study was (98.95-X)%SnO 2 .1.0%CoO.0.05%Cr 2 O 3 .X%Ta 2 O 5 , where X corresponds to 0.05 and 0.065 mol%. Sintering was carried out in a domestic microwave oven (2.45 GHz) fitted for lab use. Silicon carbide was placed in a refractory vessel to form a heating chamber surrounding the sample holder. The pellets were examined by scanning electron microscopy, X-ray diffractometry, direct current measurements and impedance spectroscopy. The parameters of density, medium grain size, coefficient of nonlinearity, breakdown electrical field, leakage current, and height and width of the potential barrier were analyzed.

show abstract

“…This II-IV semiconductor presents a wide band-gap (3.37 eV at room temperature), and a 2 of 12 large exciton binding energy (60 meV), being one of the most promising candidates for room temperature UV lasers and short-wavelength optoelectronic devices. Some detailed reviews have been published previously dedicated to ZnO synthesis [6], electronic properties [7], varistor applications [8], quantum dots [9] and photonic devices [10], which show the constant interest of scientists for improving its properties in various fields [11]. ZnO was synthesized by precipitation in mild hydrothermal conditions (90 °C) using a tubular reactor: the Segmented Flow Tubular Reactor (SFTR) [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Sintering of ZnO Nanopowders

Aimable¹,

Doubi²,

Stuer³

et al. 2017

Preprint

View full text Add to dashboard Cite

Nanopowders are continuously under investigation as they open new perspectives in numerous fields. There are two main challenges to stimulate their development: sufficient low-cost high throughput synthesis methods leading to a production with well-defined and reproducible properties, and for ceramics, conservation of their nanostructure after sintering. In this context, this paper presents the synthesis of a pure nanosized powder of ZnO (dv50 ~ 60 nm, easily redispersable) by using a continuous Segmented Flow Tubular Reactor (SFTR), which has previously shown its versatility and its robustness, ensuring a high powder quality and reproducibility over time. A higher scale of production can be achieved based on a "scale-out" concept by replicating the tubular reactors. The sinterability of ZnO nanopowders synthesized by the SFTR was studied, by natural sintering at 900 °C and 1100 °C, and Spark Plasma Sintering (SPS) at 900 °C. The performances of the synthesized nanopowder were compared to a commercial ZnO nanopowder of high quality. The samples obtained from the synthesized nanopowder could not be densified at low temperature by traditional sintering, whereas SPS led to a fully dense material after only 5 minutes at 900 °C, while limiting the grain growth and thus leading to a nanostructured material.

show abstract

SnO2, ZnO and related polycrystalline compound semiconductors: An overview and review on the voltage-dependent resistance (non-ohmic) feature

Cited by 265 publications

References 139 publications

Synthesis and Sintering of ZnO Nanopowders

Synthesis and Sintering of ZnO Nanopowders

Electrical and microstructural properties of microwave sintered SnO2-based varistors

Synthesis and Sintering of ZnO Nanopowders

Contact Info

Product

Resources

About