Growth, structure, luminescence and mechanical resonance of Bi<sub>2</sub>O<sub>3</sub>nano- and microwires

Vila, María; Dı́az-Guerra, C.; Piqueras, J.; López‐Conesa, Lluís; Estradé, S.; Peiró, Francesca

doi:10.1039/c4ce01639d

Cited by 13 publications

(14 citation statements)

References 57 publications

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“…The Bi 2 O 3 nanowires (Figure b) grow forming a dense distribution of entangled nanostructures. Their width varies between 100 and 200 nm approximately and their typical length is about 10 μm …”

Section: Resultsmentioning

confidence: 99%

“…Nanowires are grown by an evaporation‐deposition process leading to the growth of a high density of single crystalline α‐Bi 2 O 3 nanostructures, that appear deposited downstream the gas flow at a region of the furnace where temperature is about 500 °C. A wide set of characterization techniques, including energy dispersive X‐ray microanalysis in both scanning and transmission electron microscopes, evidenced that Er from the precursor mixture was not incorporated into the nanowires, within experimental error . However, the addition of Er 2 O 3 was found to influence the nucleation and oxidation processes, leading to the growth of a high density of long nanostructures.…”

Section: Methodsmentioning

confidence: 98%

“…The synthesis method and the physical mechanism leading to the formation of our α‐Bi 2 O 3 nanowires has been described in detail in a previous work . Briefly, these nanostructures were grown by using a mixture of Bi powder (80 wt.%, Goodfellow, 99.997% pure) and Er 2 O 3 powder (20 wt.%, STREM Chemicals, 99.9% pure).…”

Section: Methodsmentioning

confidence: 99%

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Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Vila

Rivera-Calzada

Salas‐Colera

et al. 2018

Physica Status Solidi (a)

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The electric response of Bi2O3 nanowires is studied by means of impedance spectroscopy at high temperatures and compared to a reference bulk Bi2O3 ceramic. Nanowires present the α to δ phase transition at a similar temperature than the ceramic (1007 vs. 1010 K), showing an increase of over two orders of magnitude in the conductance. On cooling, nanowires change directly to the α phase instead of presenting metastable phases, like the bulk sample. Both samples present a dominant ionic contribution in the δ phase which is also present in the α phase at the highest temperatures. X‐ray absorption spectroscopy (XAS) measurements reveal no differences in the short range structural order of both kinds of samples at room temperature, while a detailed analysis by high temperature X‐ray diffraction (HTXRD) confirms the transitions observed in the conductance measurements. The authors relate the direct phase transition δ → α in nanowires to a lower thermal conductivity in these nanostructures.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

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Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Vila

Rivera-Calzada

Salas‐Colera

et al. 2018

Physica Status Solidi (a)

Self Cite

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“…Hariharan et al obtained α‐Bi 2 O 3 microrods with PL emission between 2.43 and 3.4 eV using the coprecipitation method. Vila et al added SnO 2 and Er 2 O 3 to the precursors used to grow α‐Bi 2 O 3 nanowires using a thermal evaporation‐deposition method. These authors observed that the presence of SnO 2 and Er 2 O 3 changed the relative intensities of the emission bands associated with Bi 2+ ions and oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Blue or red photoluminescence emission in α‐Bi₂O₃ needles: Effect of synthesis method

Schmidt

Kubaski

et al. 2018

Luminescence

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Monoclinic bismuth oxide (α-Bi O ) has attractive optical properties and, therefore, its photoluminescence (PL) behavior has been increasingly explored. Besides this fact, the influence of synthesis methods on PL properties of α-Bi O still requires research. This paper describes the influence of precipitation (PPT) and microwave-assisted hydrothermal (MAH) methods on PL properties of acicular α-Bi O microcrystals. The synthesis method promoted structural modifications on α-Bi O , in particular PPT increased the density of oxygen vacancies significantly. As a result, the PL properties of samples were different depending on the method of synthesis. PPT samples presented their maximum PL emission at 1.91 eV (red), while MAH samples had their maximum at 2.61 eV (blue). These results indicate the possibility of controlling PL properties of α-Bi O by simply choosing the adequate synthesis method.

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“…We have successfully fabricated several oxide nanowires by simple evaporation-solidification mechanism [4][5][6][7][8] . The key parameters that control the growth process are the temperature, the duration, the gas flow and the source materials.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the shape of oxide complex nanostructures

et al. 2017

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The synthesis of complex nanostructures that combine materials and dimensionality, promises the ability to identify novel designs and architectures with enhanced properties that could be used in new devices. One of the building blocks in nanomaterials are nanowires, which offer several possibilities to get complex nanostructures. We present two kinds of morphologies based on oxide nanowires obtained by a thermal evaporation method. The common feature of both morphologies is a central oxide nanowire and, depending on the growth parameters, nanowires with either nanocrystallites or nano/microrods attached to the central wire are obtained. We have previously reported the fabrication of several single oxide nanowires and in particular, gallium oxide (β-Ga 2 O 3 ) and zinc germanate oxide (Zn 2 GeO 4 ) nanowires. Here we report the shape evolution of these nanowires by the suitable modification of the growth parameters. The addition of tin oxide (SnO 2 ) to the precursors and variation of the thermal treatments duration result in the formation of the above-mentioned complex nanostructures. Structural and chemical characterizations were performed by electron microscopy techniques and Raman spectroscopy. The results shed light on the understanding of the driving mechanisms that lead to the formation of complex oxide nanostructures.

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Growth, structure, luminescence and mechanical resonance of Bi₂O₃nano- and microwires

Abstract: The growth, morphology, structure and luminescence properties of α-Bi2O3hierarchical architectures are reported. The Young moduli and quality factors of the microwires as micromechanical resonators were determined from their resonance frequencies.

Cited by 13 publications

References 57 publications

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Blue or red photoluminescence emission in α‐Bi₂O₃ needles: Effect of synthesis method

Tailoring the shape of oxide complex nanostructures

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Growth, structure, luminescence and mechanical resonance of Bi2O3nano- and microwires

Abstract: The growth, morphology, structure and luminescence properties of α-Bi2O3hierarchical architectures are reported. The Young moduli and quality factors of the microwires as micromechanical resonators were determined from their resonance frequencies.

Cited by 13 publications

References 57 publications

Correlation of Electrical Response and Structural Phase Transitions in Bi2O3 Nanowires

Correlation of Electrical Response and Structural Phase Transitions in Bi2O3 Nanowires

Blue or red photoluminescence emission in α‐Bi2O3 needles: Effect of synthesis method

Tailoring the shape of oxide complex nanostructures

Contact Info

Product

Resources

About

Growth, structure, luminescence and mechanical resonance of Bi₂O₃nano- and microwires

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Correlation of Electrical Response and Structural Phase Transitions in Bi₂O₃ Nanowires

Blue or red photoluminescence emission in α‐Bi₂O₃ needles: Effect of synthesis method