Scalable synthesis of delafossite CuAlO2 nanoparticles for p-type dye-sensitized solar cells applications

Ahmed, Jahangeer; Blakely, Colin K.; Prakash, Jai; Bruno, Shaun R.; Yu, Mingzhe; Wu, Yiying; Poltavets, Viktor V.

doi:10.1016/j.jallcom.2013.12.199

Cited by 77 publications

(48 citation statements)

References 24 publications

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“…Specially, by comparison, the diffraction peak intensities of the hexgonal product are stronger than those of the flower morphology. Further, in the Cu-based delafossite structure (CuAl 3+ O 2 ), each Cu atom is linearly coordinated between two oxygen atoms, constructing O−Cu− O dumbbells parallel to the c axis, where they proposed an alternative stacking of Cu I and layers of nominal AlO 2 composition consisting of AlO 6 octahedra sharing edges 40 as shown in Figure 4b (inset).…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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 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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“…Recent studies reveal that nanofluids have excellent thermal properties, thermal diffusivity, thermal conductivity, viscosity, specific heat capacity, and heat transfer coefficients [5][6][7]. However, liquids consisting of particles manifest many issues in terms of particle deposition, blockage of flow paths, corrosion of pipelines, and low pressure [8,9]. Recent advances in material technology allow the synthesis of innovative heat transfer fluids with enhanced transport and thermal properties by suspending nanoparticles in base fluids [9].…”

Section: Introductionmentioning

confidence: 99%

“…However, liquids consisting of particles manifest many issues in terms of particle deposition, blockage of flow paths, corrosion of pipelines, and low pressure [8,9]. Recent advances in material technology allow the synthesis of innovative heat transfer fluids with enhanced transport and thermal properties by suspending nanoparticles in base fluids [9]. Generally, nanofluids possess some remarkable properties, such as less clogging problem, reduced heat transfer system size, higher thermal conductivity, better stability, and lower pressure [10,11].…”

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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Scalable synthesis of delafossite CuAlO2 nanoparticles for p-type dye-sensitized solar cells applications

Cited by 77 publications

References 24 publications

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

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

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

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Scalable synthesis of delafossite CuAlO2 nanoparticles for p-type dye-sensitized solar cells applications

Cited by 77 publications

References 24 publications

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

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

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

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Product

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

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

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