Direct Synthesis of Tungsten Oxide Nanowires on Microscope Cover Glass

A simple technique to synthesis crystalline Tungsten Oxide nanowires is presented. Using a standard thermal hotplate, a pure 99.9% tungsten foil is annealed to 484 ± 5 oC under ambient condition to generate vapor deposition of the heated materials on a piece of 150μm thick glass cover slide pressing on the tungsten foil. Tungsten oxide nanowires are found to deposit on the cover slide facing the heated tungsten foil. These tungsten oxide nanowires were characterized with SEM, TEM, EDX, micro-Raman and XRD. The crystalline nanowires were found to be straight and clean with a diameter of 10-300nm and a length of a few tens of micrometers.

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Direct Synthesis of Tungsten Oxide Nanowires on Microscope Cover Glass

Advances in Science and Technology - Disclosing Materials at the Nanoscale ◽

10.4028/3-908158-07-9.1 ◽

2006 ◽

pp. 1-6

Author(s):

F.C. Cheong ◽

Y.W. Zhu ◽

B. Varghese ◽

Chwee Teck Lim ◽

C.H. Sow

Keyword(s):

Tungsten Oxide ◽

Direct Synthesis ◽

Cover Glass ◽

Oxide Nanowires ◽

Microscope Cover Glass

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CSVT as a Technique to Obtain Nanostructured Materials: WO3-x

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.9.31 ◽

2010 ◽

Vol 9 ◽

pp. 31-37 ◽

Cited By ~ 2

Author(s):

O. Goiz ◽

F. Chávez ◽

C. Felipe ◽

R. Peña-Sierra ◽

N. Morales

Keyword(s):

Tungsten Oxide ◽

Atmospheric Pressure ◽

Vapor Transport ◽

Silicon Substrates ◽

X Ray Diffraction ◽

Free Standing ◽

Oxide Nanowires ◽

X Ray ◽

Tungsten Foil ◽

Tungsten Oxide Film

The growth of tungsten oxide nanowires on silicon substrates without using any catalyst is demonstrated by means of close-spaced vapor transport (CSVT) technique at atmospheric pressure. The source was formerly prepared from a tungsten foil to produce a tungsten oxide film. CSVT array is completed with silicon substrates located at a distance of ~350 m over the tungsten oxide source at moderate temperatures (~750°C). Two distinct kinds of nanostructures were produced; a uniform distribution of free standing tungsten oxide wires of several micrometers in length with diameters less than 150 nm; and wires assembled to form nanowire bundle. The X-ray diffraction characterizations show that the phases of WO2.7 and WO2.9 are present.

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Controlled Fabrication of Quality ZnO NWs/CNTs and ZnO NWs/Gr Heterostructures via Direct Two-Step CVD Method

Nanomaterials ◽

10.3390/nano11071836 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1836

Author(s):

Nicholas Schaper ◽

Dheyaa Alameri ◽

Yoosuk Kim ◽

Brian Thomas ◽

Keith McCormack ◽

...

Keyword(s):

Direct Synthesis ◽

Chemical Vapor ◽

Single Walled Carbon Nanotubes ◽

Materials Synthesis ◽

Oxide Nanowires ◽

Cvd Method ◽

Thermal Actuators ◽

Potential Applications ◽

Walled Carbon Nanotubes ◽

Scalable Production

A novel and advanced approach of growing zinc oxide nanowires (ZnO NWs) directly on single-walled carbon nanotubes (SWCNTs) and graphene (Gr) surfaces has been demonstrated through the successful formation of 1D–1D and 1D–2D heterostructure interfaces. The direct two-step chemical vapor deposition (CVD) method was utilized to ensure high-quality materials’ synthesis and scalable production of different architectures. Iron-based universal compound molecular ink was used as a catalyst in both processes (a) to form a monolayer of horizontally defined networks of SWCNTs interfaced with vertically oriented ZnO NWs and (b) to grow densely packed ZnO NWs directly on a graphene surface. We show here that our universal compound molecular ink is efficient and selective in the direct synthesis of ZnO NWs/CNTs and ZnO NWs/Gr heterostructures. Heterostructures were also selectively patterned through different fabrication techniques and grown in predefined locations, demonstrating an ability to control materials’ placement and morphology. Several characterization tools were employed to interrogate the prepared heterostructures. ZnO NWs were shown to grow uniformly over the network of SWCNTs, and much denser packed vertically oriented ZnO NWs were produced on graphene thin films. Such heterostructures can be used widely in many potential applications, such as photocatalysts, supercapacitors, solar cells, piezoelectric or thermal actuators, as well as chemical or biological sensors.

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