Synthesis of the p-type semiconducting ternary oxide CuAlO2 using the Pechini method

Jarman, Richard H.; Bafia, Julie; Gebreslasse, Tsige; Ingram, Brian J.; Carter, J. David

doi:10.1016/j.materresbull.2013.06.003

Cited by 13 publications

(15 citation statements)

References 22 publications

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“…They used nano-boehmite and Cu 2 O as starting materials. Jarman et al [41] synthesized phase pure CuAlO 2 at 1100 °C in 3h using the Pechini method. On the other hand, a few studies considered using the advantage of inert atmosphere sintering in combination with sol-gel method, which enables atomic level mixing during powder preparation Das et al [29] prepared a nitrate based metal ion containing gel and obtained pure CuAlO 2 powders by calcining this gel at 900 °C for 4 h under argon atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Akyıldız

2015

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Akyıldız

2015

Ceramics International

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“…34 However, to the best of our knowledge, morphology-dependent ozone gas sensor activities of CuAlO 2 nanostructures have not been explored in the open literature.…”

Section: Introductionmentioning

confidence: 99%

In-Depth Understanding of the Relation between CuAlO₂ Particle Size and Morphology for Ozone Gas Sensor Detection at a Nanoscale Level

Thirumalairajan

Mastelaro

Escanhoela

2014

ACS Appl. Mater. Interfaces

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A morphology-dependent nanomaterial for energy and environment applications is one of the key challenges for materials science and technology. In this study, we investigate the effect of the particle size of CuAlO 2 nanostructures prepared through the facile and hydrothermal process to detect ozone gas. Phase analysis and structural information were obtained using X-ray diffraction and microRaman studies. The chemical states of CuAlO 2 atomic species were determined by X-ray photoelectron spectroscopy. Electron microscopy images revealed the flower and hexagonal shape constituted of pentagon and oval CuAlO 2 nanoparticles with average size ∼40 and 80 nm. The specific surface area was measured and found to be 59.8 and 70.8 m 2 g −1 , respectively. The developed CuAlO 2 nanostructures not only possess unique morphology but also influence the ozone gas sensing performance. Among the two structures, CuAlO 2 , with hexagonal morphology, exhibited superior ozone detection for 200 ppb at 250°C, with a response and good recovery time of 25 and 39 s compared to the flower morphology (28 and 69 s). These results show that not only does the morphology play an major role but also the particle size, surface area, gas adsorption/desorption, and grain−grain contact, as proposed in the gas sensing mechanism. Finally, we consider CuAlO 2 material as a good candidate for environment monitoring applications.

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“…Despite all this, obtaining single phases and well crystallined material has been a problem as observed from their XRD patterns. Recently, Jarman et al 27 synthesized CAO using the Pechini method and obtained a pure phase at the reaction time of 3 h. Despite the success, the number of stages and reagents involved for the preparation for the CAO still make the conventional process economical and less involving. Amrute et al 24 also synthesised CAO using solid state reaction, one in air and the other one in nitrogen atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Rapid synthesis and electrical transition in p-type delafossite CuAlO₂

2014

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Highly polycrystalline and pure delafossite phase CuAlO 2 powder has been synthesised within a short annealing period, shorter than most conventional processes. This is an improvement over the conventional synthesis procedures. Conventional synthesis procedure has seen CuAlO 2 only formed at high annealing temperatures ≥ 1100°C over long annealing time, some as long as 96 hours. In the current process, a pure phase devoid of impurities has been obtained at reduced calcination time of 1.5 hours in an argon atmosphere at a temperature of 1150°C. This was confirmed by XRD and SEM/EDX. High temperature DC/AC electrical measurements show a change in conduction mechanism from mixed conductivity (ionic + p-type) in the temperature range of 375 ≥ T ≥ 25°C to intrinsic type behavior above 375°C. The activation energies for these two regimes are 0.27 eV and 0.08 eV respectively. This change from mixed to DC conductivity is confirmed by spectral analysis too. Spectral analysis using the power law also revealed that conduction is of long range hopping. Use of platinum as a contact electrode at elevated temperatures has a detrimental effect on the electrical properties since it encourages the formation of CuAl 2 O 4 at the interface due to the formation of more stable Cu−Pt alloy by virtue of the chemical reaction Pt + 2CuAlO 2 − → CuAl 2 O 4 + Pt Cu .

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Synthesis of the p-type semiconducting ternary oxide CuAlO2 using the Pechini method

Cited by 13 publications

References 22 publications

Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

In-Depth Understanding of the Relation between CuAlO₂ Particle Size and Morphology for Ozone Gas Sensor Detection at a Nanoscale Level

Rapid synthesis and electrical transition in p-type delafossite CuAlO₂

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Synthesis of the p-type semiconducting ternary oxide CuAlO2 using the Pechini method

Cited by 13 publications

References 22 publications

Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

Synthesis of CuAlO2 from chemically precipitated nano-sized precursors

In-Depth Understanding of the Relation between CuAlO2 Particle Size and Morphology for Ozone Gas Sensor Detection at a Nanoscale Level

Rapid synthesis and electrical transition in p-type delafossite CuAlO2

Contact Info

Product

Resources

About

In-Depth Understanding of the Relation between CuAlO₂ Particle Size and Morphology for Ozone Gas Sensor Detection at a Nanoscale Level

Rapid synthesis and electrical transition in p-type delafossite CuAlO₂