CaCu3Ti4O12 Ceramic Synthesized by Sonochemical-Assisted Process

Wongpisutpaisan, Narongdet; Vittayakorn, Naratip; Ruangphanit, Anucha; Pecharapa, Wisanu

doi:10.1080/10584587.2013.852936

Cited by 9 publications

(9 citation statements)

References 9 publications

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“…Wongpisutpaisan et al [39] synthesized the giant dielectric-constant material CCTO by aonochemical-assisted process containing stoichiometric amounts of the metal nitrate, at a shorter reaction time than that of a conventional solid-state reaction. Synthesis from a solution affords intimate and homogeneous mixing of the metal ions at the atomic scale.…”

Section: Synthesis Methods Of Cctomentioning

confidence: 99%

“…The diameter of the multiphase CCTO powders was 500 nm as obtained by SEM, and the average crystalline size calculated using the Scherrer’s equation from the full-width-at-half-maximum (FWHM) of the strongest diffraction peak (220) was ∼75 nm. Wongpisutpaisan et al [39] observed that as the frequency increased over 1 kHz, the ɛ rapidly decreased. In addition, the higher ɛ values at lower frequency could be related to the possibility of the presence of interfacial polarization.…”

Section: Synthesis Methods Of Cctomentioning

confidence: 99%

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A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

2016

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Electroceramic calcium copper titanates (CaCu3Ti4O12, CCTO), with high dielectric permittivities (ε) of approximately 105 and 104, respectively, for single crystal and bulk materials, are produced for a number of well-established and emerging applications such as resonator, capacitor, and sensor. These applications take advantage of the unique properties achieved through the structure and properties of CCTO. This review comprehensively focuses on the primary processing routes, effect of impurity, dielectric permittivity, and deposition technique used for the processing of electroceramics along with their chemical composition and micro and nanostructures. Emphasis is given to versatile and basic approaches that allow one to control the microstructural features that ultimately determine the properties of the CCTO ceramic. Despite the intensive research in this area, none of the studies available in the literature provides all the possible relevant information about CCTO fabrication, structure, the factors influencing its dielectric properties, CCTO immobilization, and sensing applications.

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Section: Synthesis Methods Of Cctomentioning

confidence: 99%

Section: Synthesis Methods Of Cctomentioning

confidence: 99%

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

2016

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“…The initial concentration of BPA c 0 was kept fixed. The apparent pseudo first-order rate constant k 1 …”

Section: Methodsmentioning

confidence: 99%

Photocatalytic Activity of SnO2-Doped SiO2@TiO2 Nanocomposites

Czech

Nazarkovsky

Gun’ko

2014

Nanoscience Advances in CBRN Agents Detection, Information and Energy Security

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Bisphenol A (BPA) is worldwide used to produce plastics and/or epoxybased foodstuff packages. But it is known that this compound is considered as a quite toxic contaminant due to (1) its similarity to the hormone estrogen and (2) its universal use in many industrial proceses. In our study the photodegradation of BPA stimulated by tin(IV) oxide-modified silica-titania nanocomposites was investigated. The reactions were characterized by the kinetic parameters (pseudo-first constant k 1 0.036-0.0896Á10for non-calcined and 0.0389-0.1144Á10 À2 min À1 for calcined photocatalysts), half-life time t 1/2 7.74-19.23 and 6.66-17.83 min for non-and calcined ones, respectively, allowing to determine both the weight k w and the specific surface area k s of each sample. It will be shown that most SnO 2 -doped silica-titania oxides are more active than commercially available TiO 2 (P-25, Degussa). The best results of BPA removal were obtained for 6 wt% addition of SnO 2 to both calcined and non-calcined photocatalysts.

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“…Also, their availability is easy with low cost. Therefore, doping of Cu ions was chosen for enhancement of photocatalytic activity 23 . Important points in the semiconductor photocatalyst materials are band gap energy between CB and VB and potential energy levels of CB and VB.…”

Section: ) Mechanism For Doped Metal In Tio2mentioning

confidence: 99%

“…It is found that the phytochemical present in fruit peels 20 are responsible for synthesis of Cu-doped nanoparticles that itself acts as stabilizers in synthesis 15 thus special capping agent/ stabilizer is not required. As plant extract is used instead of organic chemicals, this method omits the use of conventional chemicals like isopropyl alcohol 21 , ethanol 22 , polyvinyl alcohol 23 , etc. On the other hand, plant extract is prepared in water with waste peels.…”

Section: Introductionmentioning

confidence: 99%

Green and Rapid Synthesis of Copper-Doped TiO2 Nanoparticles with Increased Photocatalytic Activity

Raorane¹,

Chavan²,

Pednekar³

et al. 2017

Advances in Chemical Science

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Nano-sized TiO2 photocatalytic water-splitting technology has great potential for low-cost, environmental friendly solarhydrogen production to support the future hydrogen economy. One of the main drawbacks of using TiO2 as a photocatalyst is its band gap of around 3.2 eV for the anatase phase in the near-UV range of the electromagnetic spectrum that uses only small fraction of the solar spectrum. In this study, we have developed an eco-friendly process to synthesize copper doped TiO2 nanoparticles in greener and rapid way that decreases the band gap up to ~2.17-2.50 eV and shifts the absorption to readily available visible range of solar spectrum. Current work is devoted towards the synthesis of copper doped TiO2 nanoparticles in anatase phase in a reliable way by using fruit peel extract of Annona squamosa which is otherwise an agricultural waste by microwave assisted method as a source of energy. This method reduces time, saves chemicals and energy. Doping of copper (Cu) metal efficiently lessens the band gap of TiO2 for the photo-excitation (red shift) and simultaneously reduces the recombination rate of photo generated electron-hole pairs. Characterization studies of green synthesized Cu-doped nano-sized TiO2 particles show significant enhancement in photocatalytic activity that can be potentially applied for hydrogen production than that of pure ones. Use of plant extract and microwave method together makes the synthesis protocol reliable, green and rapid.

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CaCu₃Ti₄O₁₂ Ceramic Synthesized by Sonochemical-Assisted Process

Cited by 9 publications

References 9 publications

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

Photocatalytic Activity of SnO2-Doped SiO2@TiO2 Nanocomposites

Green and Rapid Synthesis of Copper-Doped TiO2 Nanoparticles with Increased Photocatalytic Activity

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