Surface analysis, TEM, dynamic and controlled rate thermal analysis, and infrared emission spectroscopy of gallium doped boehmite nanofibres and nanosheets

Yang, Jing; Zhao, Yanyan; Frost, Ray L.

doi:10.1016/j.apsusc.2009.04.171

Cited by 12 publications

(8 citation statements)

References 36 publications

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“…Control of size and morphology is currently a key issue in developing functional materials and much effort has been undertaken for upgrading the characteristics of materials . Novel nanomaterials may be based upon boehmite, , titania, gallium oxyhydroxide, , cobalt oxyhydroxide, , and designed clay minerals. , Because of their high surface area, chemical and thermally stable properties, and mesoporous properties, metal oxides have been extensively used as carriers and support for a variety of industrial catalysts at high and low temperatures. The oxides of cobalt can be employed as catalysts, adsorbents, , composite materials, , and ceramics. – …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Cobalt Hydroxide, Cobalt Oxyhydroxide, and Cobalt Oxide Nanodiscs

et al. 2009

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Cobalt hydroxide, cobalt oxyhydroxide, and cobalt oxide nanomaterials were synthesized through simple soft chemistry. The cobalt hydroxide displays hexagonal morphology with clear edges 20 nm long. This morphology and nanosize is retained through to cobalt oxide Co3O4 through a topotactical relationship. Cobalt oxyhydroxide and cobalt oxide nanomaterials were synthesized through oxidation and low-temperature calcination from the as-prepared cobalt hydroxide. Characterization of these cobalt-based nanomaterials was fully developed, including X-ray diffraction, transmission electron microscopy combined with selected area electron diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermal gravimetric analysis. Bonding of the divalent cobalt hydroxide from the oxyhydroxide and oxides by studying their high-resolution XPS spectra for Co 2p3/2 and O 1s. Raman spectroscopy of the as-prepared Co(OH)2, CoO(OH), and Co3O4 nanomaterials characterized each material. The thermal stability of the materials Co(OH)2 and CoO(OH) was established. This research has developed methodology for the synthesis of cobalt oxide and cobalt oxyhydroxide nanodiscs at low temperatures.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Cobalt Hydroxide, Cobalt Oxyhydroxide, and Cobalt Oxide Nanodiscs

et al. 2009

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“…Because of their high surface area, chemical and thermally stable properties and mesoporous properties, metal oxides have been extensively used as carriers and support for a variety of industrial catalysts at high as well as low temperatures. Novel nanomaterials may be based upon boehmite,1, 2 titania,3 gallium oxyhydroxide4, 5 and designed clay minerals 6, 7. Special attention has been focused on the formation and properties of chromium oxyhydroxide (CrO(OH)) and chromia (Cr 2 O 3 ), which are important in specific applications such as in high‐temperature‐resistant materials,8, 9 liquid crystal displays,10, 11 catalysts12, 13 and so on.…”

Section: Introductionmentioning

confidence: 99%

Transition of chromium oxyhydroxide nanomaterials to chromium oxide: a hot‐stage Raman spectroscopic study

Yang

Martens

Frost

2010

J Raman Spectroscopy

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The transition of disc-like chromium hydroxide nanomaterials to chromium oxide nanomaterials has been studied by hot-stage Raman spectroscopy. The structure and morphology of α-CrO(OH) synthesised using hydrothermal treatment were confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The Raman spectrum of α-CrO(OH) is characterised by two intense bands at 823 and 630 cm −1 attributed to ν 1 Cr III -O symmetric stretching mode and the band at 1179 cm −1 attributed to Cr III -OH δ deformation modes. No bands are observed above 3000 cm −1 . The absence of characteristic OH stretching vibrations may be due to short hydrogen bonds in the α-CrO(OH) structure. Upon thermal treatment of α-CrO(OH), new Raman bands are observed at 599, 542, 513, 396, 344 and 304 cm −1 , which are attributed to Cr 2 O 3 . This hot-stage Raman study shows that the transition of α-CrO(OH) to Cr 2 O 3 occurs before 350 • C.

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“…A description of the cell and the principles of the emission experiment have been published elsewhere. [25][26][27][28] Approximately 0.2 mg of synthesized indium hydroxide was spread as a thin layer (approximately 0.2 lm) on a 6 mm diameter platinum surface and held in an inert atmosphere within a nitrogenpurged cell during heating. The emission spectra were collected at intervals of 50 8C over the range 100-600 8C.…”

Section: Methodsmentioning

confidence: 99%

Application of Infrared Emission Spectroscopy to the Thermal Transition of Indium Hydroxide to Indium Oxide Nanocubes

et al. 2011

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Cubic indium hydroxide nanomaterials were obtained by a low-temperature soft-chemical method without any surfactants. The transition of nano-cubic indium hydroxide to cubic indium oxide during dehydroxylation has been studied by infrared emission spectroscopy. The spectra are related to the structure of the materials and the changes in the structure upon thermal treatment. The infrared absorption spectrum of In(OH)(3) is characterized by an intense OH deformation band at 1150 cm(-1) and two O-H stretching bands at 3107 and 3221 cm(-1). In the infrared emission spectra, the hydroxyl-stretching and hydroxyl-bending bands diminish dramatically upon heating, and no intensity remains after 200 °C. However, new low intensity bands are found in the OH deformation region at 915 cm(-1) and in the OH stretching region at 3437 cm(-1). These bands are attributed to the vibrations of newly formed InOH bonds because of the release and transfer of protons during calcination of the nanomaterial. The use of infrared emission spectroscopy enables the low-temperature phase transition brought about through dehydration of In(OH)(3) nanocubes to be studied.

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Surface analysis, TEM, dynamic and controlled rate thermal analysis, and infrared emission spectroscopy of gallium doped boehmite nanofibres and nanosheets

Cited by 12 publications

References 36 publications

Synthesis and Characterization of Cobalt Hydroxide, Cobalt Oxyhydroxide, and Cobalt Oxide Nanodiscs

Synthesis and Characterization of Cobalt Hydroxide, Cobalt Oxyhydroxide, and Cobalt Oxide Nanodiscs

Transition of chromium oxyhydroxide nanomaterials to chromium oxide: a hot‐stage Raman spectroscopic study

Application of Infrared Emission Spectroscopy to the Thermal Transition of Indium Hydroxide to Indium Oxide Nanocubes

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