Synthesis of delafossite CuAlO2 p-type semiconductor with a nanoparticle-based Cu(I) acetate-loaded boehmite precursor

Thu, Tran Viet; Thanh, Pham Duc; Suekuni, Koichiro; Hai, Nguyen Hoang; Mott, Derrick; Koyano, Mikio; Maenosono, Shinya

doi:10.1016/j.materresbull.2011.07.047

Cited by 25 publications

(19 citation statements)

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“…annealing the as-prepared powders (figure 1 (ii)), leads to a large increase in the spinel CuAl 2 O 4 impurity phase as evidenced by the increase of the (220) peak at 2θ = 31.3° and (400) peak at 2θ = 44.9°. As compared to other recent reports using boehmite in 5 conjunction with copper salt precursors where residual impurities remained, 24 it was found that phase pure CuAlO 2 powder can be prepared by a single anneal by using an excess of CuO. The XRD data in figure 1 from hundreds of nm up to 40-50µm.…”

Section: Characterisation and Thermal Decompositionmentioning

confidence: 64%

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

et al. 2013

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In this work we demonstrate simple techniques to form well crystallised CuAlO 2 powders and thick films from CuO and boehmite or alumina, using a novel molten salt painting process. We examine the formation mechanism using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray 15 spectroscopy and in situ high temperature X-ray diffraction and find that the annealing atmosphere plays a critical role. From this we develop a method to create Cu-Al 2 O 3 conductive metal-ceramic composite materials with novel morphologies via the thermal decomposition of CuAlO 2 precursor films.

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Section: Characterisation and Thermal Decompositionmentioning

confidence: 64%

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

et al. 2013

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“…A number of methods have been employed for the synthesis of bulk CAO, such as wet chemical synthesis (sol-gel, hydrothermal) 3,5,[19][20][21] 25,26 . The synthesis temperatures involved here are always in the excess of 1100°C and for prolonged reaction times, ranging from 3 to 96 hours as shown in Table 1.…”

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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“…Hence, finding the stability of nanofluids is a great challenge in the two-step technique. Cuprous aluminate delafossite (CuAlO 2 ) nanostructured has been synthesized for some time using chemical or physical routes [11,15,16]. Among all the techniques which have been employed to fabricate CuAlO 2 nanostructured, the water-based nanofluid loaded one-dimensional delafossite CuAlO 2 nanowire has not yet been explored deeply.…”

Section: Introductionmentioning

confidence: 99%

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

Alhummiany

2018

Journal of Nanomaterials

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Ultra-high cooling performance is a crucial requirement of many thermomechanical systems, such as microelectronic devices, engine cooling systems, nuclear power systems, chemical reactors, and refrigeration systems. Recent experimental results reveal the potential thermal properties of suspended nanometallics in conventional fluids. In this study, the facile synthesis of one-dimensional delafossite CuAlO 2 nanowires by microwave hydrothermal treatment was presented. A novel type of nanofluid consisting of CuAlO 2 nanowires suspended in distilled water at various volume fractions (0.0, 0.2, 0.4, and 0.6 wt%) was successfully synthesized using an easily scalable sonication method. The microstructures of as-synthesized CuAlO 2 were investigated by adopting X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and field-emission scanning electron microscopy (FESEM). Furthermore, the thermal conductivity and specific heat capacity of water-loaded nanofluid were measured at different volume fractions and temperatures. The results reveal a significant increase in thermal conductivity with increasing CuAlO 2 loading levels and temperatures. The obtained results propound the fact that water-loaded delafossite CuAlO 2 nanowires-based nanofluid is a promising candidate for future industrial applications.

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Synthesis of delafossite CuAlO2 p-type semiconductor with a nanoparticle-based Cu(I) acetate-loaded boehmite precursor

Cited by 25 publications

References 50 publications

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

Rapid synthesis and electrical transition in p-type delafossite CuAlO₂

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

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Synthesis of delafossite CuAlO2 p-type semiconductor with a nanoparticle-based Cu(I) acetate-loaded boehmite precursor

Cited by 25 publications

References 50 publications

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

Dellafossite CuAlO2 film growth and conversion to Cu–Al2O3 metal ceramic composite via control of annealing atmospheres

Rapid synthesis and electrical transition in p-type delafossite CuAlO2

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO2 Nanowires: Structural and Thermal Properties

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Rapid synthesis and electrical transition in p-type delafossite CuAlO₂

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties