A Rational Self‐Sacrificing Template Route to β‐Bi<sub>2</sub>O<sub>3</sub> Nanotube Arrays.

Yang, Baocheng; Mo, Maosong; Hu, Hanmei; Li, Cun; Yang, Xiaogang; Li, Qiaowei; Qian, Yitai

doi:10.1002/chin.200428224

Cited by 8 publications

(10 citation statements)

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“…A Stokes shift was observed-such an effect has been attributed to either band-edge emission or shallow-trap emission. Similar results have been reported by Yang and Dong [56,57].…”

Section: Resultssupporting

confidence: 92%

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

2011

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Composite Bi@Bi 2 O 3 microspheres have been synthesized via a microwave-assisted solvothermal route. The Bi@Bi 2 O 3 microspheres had a narrow size distribution in the range 1.2-2.8 mm. Glucose was selected as the reductant, BiCl 3 as the bismuth source, and ethylene glycol (EG) as the solvent in the synthesis system. The as-synthesized sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle diameter distribution, energy dispersive X-ray spectroscopy (EDS), ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence (PL) spectroscopy. The photocatalytic activities of the Bi@Bi 2 O 3 microspheres were evaluated by the photodegradation of rhodamine B (RhB) and methyl orange (MO) dyes under UV light irradiation. The degradation reached ~96.6% for RhB and 100% for MO after 4 h reaction in the presence of the as-synthesized Bi@Bi 2 O 3 microspheres.

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“…A Stokes shift was observed-such an effect has been attributed to either band-edge emission or shallow-trap emission. Similar results have been reported by Yang and Dong [56,57].…”

Section: Resultssupporting

confidence: 92%

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

2011

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“…K 2 CO 3 and Na 2 CO 3 dissolved into KCl and diffused on the surfaces of as‐synthesized Nb 2 O 5 nanobars. The Nb 2 O 5 nanobars in the reaction served as ‘‘self‐sacrificing templates’’ which maintained their 1‐D morphology in the reaction process, resulting in the formation of the (K,Na)NbO 3 nanobars. At T > T m (KCl), the small diffusion distances of oxide mixtures in molten salts, the high reactivity of salts, and the high mobility of species were thought to benefit the formation of single‐crystalline crystals .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Piezoelectricity of Single‐Crystalline (K,Na)NbO₃ Nanobars

2011

J. Am. Ceram. Soc.

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Piezoelectric nanostructures have many important applications in nanodevices and micro‐electro‐mechanical systems. This work developed a topochemical method based on Molten‐Salt Synthesis for synthesizing one‐dimensional nanoscale single crystals of lead‐free (K,Na)NbO3 (KNN) piezoelectric oxides. The synthesis process started from molten‐salt reaction between Nb2O5 powders and KCl to produce high‐aspect‐ratio K2Nb8O21 bar‐shaped particles which were transformed to Nb2O5 nanobars via ion‐exchange and thermal decomposition steps, and finally, KNN nanobars were formed also by molten‐salt reaction among Nb2O5 nanobars as templates, and K2CO3 and Na2CO3 in KCl salts. The as‐synthesized KNN nanobars were proved to be single crystals by transmission electron microscopy. The piezoelectricity of an individual KNN nanobar was confirmed by scanning probe microscopy, as the effective piezoelectric coefficient d33* was measured to be 113 pm/V.

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“…can form in addition to Bi 2 O 3 , whose presence, types of crystalline planes and properties depend on: (i) the properties of the initial bismuth layers; (ii)the oxidation conditions: the maximum attained temperature, the oxidation duration, the heating and cooling rates; (iii) the eventual post-oxidation treatment. There are numerous reports in the scientific literature concerning bismuth oxide thin films obtained by thermal oxidation or by other methods, films exhibiting various structures, morphologies, and optoelectronic properties [1,9,21,[40][41][42][43][44][45][46][47][48]. There are only a few reports on the preparation of bismuth oxide films containing only one type of oxide obtained by thermal oxidation, and these were accomplished at high oxidation temperatures (above 600 K) and/or for long oxidation times of up to a few days, as J. George and collaborators reported [49], along with K. Jayachandran in [22], in both cases the layers consisting of β-Bi 2 O 3 , while H. A. Zayed obtained polycrystalline δ-Bi 2 O 3 thin films [50].…”

Section: Introductionmentioning

confidence: 99%

Bismuth Oxide Thin Films for Optoelectronic and Humidity Sensing Applications

Condurache-Bota¹

2018

Bismuth - Advanced Applications and Defects Characterization

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Bismuth oxide thin films still prove attractive to both scientists and engineers due to their semiconducting behavior, large energy bandgap and high refractive index, despite their often complex structure, both polymorphic and polycrystalline. We present here a summary and a comparison of the morpho-structural and optical properties of such films prepared through three physical vapor deposition (PVD) techniques on several types of substrates kept at different temperatures. Thermal vapor deposition, thermal oxidation in air and pulsed laser deposition are discussed as largely used PVD methods. It is proved that the physical properties of the bismuth oxide thin films can be tailored by changing the substrate nature and its temperature during the deposition process in a way even more relevant than even the chosen deposition method. Thus, bismuth oxide thin films with energy bandgaps ranging from the infrared up to near-ultraviolet can be obtained, depending on their structure and morphology. High refractive index of the films can be also attained for specific spectral ranges. When deposited on certain conductive substrates, the films have much lower electrical resistance and even became sensitive to water vapor. Therefore, humidity sensing and optoelectronic applications of the analyzed bismuth oxide thin films can be easily found and used in both science and technology.

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A Rational Self‐Sacrificing Template Route to β‐Bi₂O₃ Nanotube Arrays.

Cited by 8 publications

References 1 publication

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

Synthesis and Piezoelectricity of Single‐Crystalline (K,Na)NbO₃ Nanobars

Bismuth Oxide Thin Films for Optoelectronic and Humidity Sensing Applications

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A Rational Self‐Sacrificing Template Route to β‐Bi2O3 Nanotube Arrays.

Cited by 8 publications

References 1 publication

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

Generation and photocatalytic activities of Bi@Bi2O3 microspheres

Synthesis and Piezoelectricity of Single‐Crystalline (K,Na)NbO3 Nanobars

Bismuth Oxide Thin Films for Optoelectronic and Humidity Sensing Applications

Contact Info

Product

Resources

About

A Rational Self‐Sacrificing Template Route to β‐Bi₂O₃ Nanotube Arrays.

Synthesis and Piezoelectricity of Single‐Crystalline (K,Na)NbO₃ Nanobars