Preparation and photoluminescence properties of crystalline GeO2 nanowires

Wu, Xing; Song, Wenhai; Zhao, Boyang; Sun, Yanbin; Du, Juan

doi:10.1016/s0009-2614(01)01213-1

Cited by 141 publications

(107 citation statements)

References 13 publications

Supporting

Mentioning

104

Contrasting

Order By: Relevance

“…The broad band with large full width at half maximum (FWHM) value has also been observed previously in other nanoscale materials [37][38][39]. The PL emission peak of the CuGeO 3 nanowires grown from GeO 2 , CuO and copper foil is very different from those of the CuGeO 3 nanowires grown from GeO 2 and copper foil at 442 nm [22], zinc germanate nanorods at 440 nm [23] and one-dimensional germanium oxide nanostructures at about 448 nm which display the blue light emission [40,41]. The blue light emission was attributed to oxygen vacancies and oxygen-germanium vacancies.…”

Section: +supporting

confidence: 58%

Preparation of copper germanate nanowires with good electrochemical sensing properties

Wang

Yang

et al. 2010

Cryst. Res. Technol.

View full text Add to dashboard Cite

Ternary copper germanate nanowires have been synthesized by the hydrothermal deposition route in an autoclave using germanium dioxide and copper oxide powders as the starting materials as well as the copper germanate nanowires have been investigated for cysteine sensing characteristics. The nanowires with the length of several dozens of micrometers are mainly composed of single crystalline orthorhombic CuGeO3, which are supported by X‐ray diffraction, selected area electron diffraction, high‐resolution transmission electron microscopy and X‐ray photoelectron spectrum. Room temperature photoluminescence spectrum exhibits strong green light emission ability at 535.4 nm with a broad emission band. The copper germanate nanowires may be controlled grown by controlling the growth conditions of the nanowires. The nanowire growth process is explained using a solid state growth mechanism. The electrochemical analysis demonstrates that the copper germanate nanowires serve as a good electrochemical sensor with excellent electrochemical sensing ability for cysteine and catalytic ability for electron‐transfer process. The electrochemical result of the copper germanate nanowires presents an important advance toward the application for electrochemical sensors operating at room temperature. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Section: +supporting

confidence: 58%

Preparation of copper germanate nanowires with good electrochemical sensing properties

Wang

Yang

et al. 2010

Cryst. Res. Technol.

View full text Add to dashboard Cite

show abstract

“…Bis-tris propane (1,(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) Bis(tris(hydroxymethyl)methylamino)propane,99%) was obtained from Acros Chemicals. Chemicals were used as received.…”

Section: Methodsmentioning

confidence: 99%

Preparation of hexagonal GeO₂particles with particle size and crystallinity controlled by peptides, silk and silk-peptide chimeras

2014

View full text Add to dashboard Cite

We demonstrate the use of silk based proteins to control the particle/crystallite size during GeO 2 formation, using a bio-mimetic approach at circumneutral pH and ambient temperature. Multicrystalline GeO 2 was prepared from germanium tetraethoxide (TEOG) in the presence of different silk-based proteins: Bombyx mori silk (native silk) and two chimeric proteins prepared by linking a germania binding peptide (Ge28: HATGTHGLSLSH) with Bombyx mori silk via chemical coupling at different peptide loadings (silk-Ge28 10% and silk-Ge28 50%). The mineralisation 10 activity of the silk-based proteins was compared with that of peptide Ge28 as a control system. GeO 2 mineralisation was investigated in water and in citric acid/bis-tris propane buffer at pH 6. Morphology, particle size, crystallinity, water and organic content of the materials obtained were analysed to study the effect of added biomolecules and mineralisation environment on material properties. In the presence of silk additives well-defined cube-shape hybrid materials composed of hexagonal germania and up to ca. 5 wt% organic content were obtained. The cubic particles 15 ranged from 0.4 to 1.4 m in size and were composed of crystalline domains in the range 35-106 nm depending on the additive used and synthesis conditions. The organic material incorporated in the mineral did not appear to affect the unit cell dimensions. The silk and chimeric proteins in water promote material formation and crystal growth, possibly via an effective ion-channelling mechanism. The germania binding peptide alone did not have any significant effect on reaction rate, yield or the material's properties compared to the blank. Interestingly, the peptide 20 content in the silk chimeras tested did not affect mineralisation. The presence of buffer inhibited mineral condensation rate and yield. The use of silk-based biomolecules allows control of crystallite/particle size of hybrid materials opening up opportunities for bio-inspired approaches to be applied for the synthesis of functional germania based devices and materials.

show abstract

“…In addition to alumina, silica, and titania, germania has been gaining tremendous importance mainly due to its enhanced reactivity and optical properties [9,10]. Germania-silica hybrid materials, Nd þ3 -doped germaina glasses, and erbium-doped germania have been prepared for optical device fabrications [11][12][13].…”

Section: Introduction Omentioning

confidence: 99%

Biomimetic Synthesis and Antibacterial Characteristics of Magnesium Oxide—Germanium dioxide Nanocomposite Powders

Avanzato

Follieri

Banerjee

et al. 2009

Journal of Composite Materials

View full text Add to dashboard Cite

The efficiency of growth of nanocrystalline magnesium oxidegermanium dioxide nanocomposite powders at room temperature was investigated in the presence of the amino acids histidine, aspartic acid, and the biopolymer poly-L-lysine under varying conditions. It was observed that of the three, poly-L-lysine and histidine were more efficient and formed higher yields of the products. The growth of the nanocomposties was found to be pH-sensitive as indicated by zeta potential as well as TEM, and dynamic light scattering analyses. Furthermore, the nanocomposite powders were found to have significant antibacterial activity against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria.

show abstract

Preparation and photoluminescence properties of crystalline GeO2 nanowires

Cited by 141 publications

References 13 publications

Preparation of copper germanate nanowires with good electrochemical sensing properties

Preparation of copper germanate nanowires with good electrochemical sensing properties

Preparation of hexagonal GeO₂particles with particle size and crystallinity controlled by peptides, silk and silk-peptide chimeras

Biomimetic Synthesis and Antibacterial Characteristics of Magnesium Oxide—Germanium dioxide Nanocomposite Powders

Contact Info

Product

Resources

About

Preparation and photoluminescence properties of crystalline GeO2 nanowires

Cited by 141 publications

References 13 publications

Preparation of copper germanate nanowires with good electrochemical sensing properties

Preparation of copper germanate nanowires with good electrochemical sensing properties

Preparation of hexagonal GeO2particles with particle size and crystallinity controlled by peptides, silk and silk-peptide chimeras

Biomimetic Synthesis and Antibacterial Characteristics of Magnesium Oxide—Germanium dioxide Nanocomposite Powders

Contact Info

Product

Resources

About

Preparation of hexagonal GeO₂particles with particle size and crystallinity controlled by peptides, silk and silk-peptide chimeras