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550086

Sigma-Aldrich

Tungsten(VI) oxide

nanopowder, <100 nm particle size (TEM)

Synonym(s):

Tungstic anhydride

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About This Item

Linear Formula:
WO3
CAS Number:
1314-35-8
Molecular Weight:
231.84
EC Number:
215-231-4
MDL number:
MFCD00011466
UNSPSC Code:
12352302
PubChem Substance ID:
24879090
NACRES:
NA.23
Pricing and availability is not currently available.

form

nanopowder

particle size

<100 nm (TEM)

density

7.16 g/mL at 25 °C (lit.)

SMILES string

O=[W](=O)=O

InChI

1S/3O.W

InChI key

ZNOKGRXACCSDPY-UHFFFAOYSA-N

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General description

Tungsten oxide (WO3) nanopowder is a metallic powder that can be prepared by the calcination of ammonium paratungstate (APT) in the temperature range of 560°C and 850°C. It can be produced by a variety of techniques, such as electrodeposition, sputtering, milling, and chemical processes.[1]

Application

WO3 can be used for a variety of applications, such as electronics, optics, gas sensors and elecctrochromism.[2][3][4][5]

Storage Class Code

11 - Combustible Solids

WGK

nwg

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
MKCX0223
0000246212
MKCS9702
0000246212
MKCR2040

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Formation of Ruthenium Cluster on Nanocrystalline Tungsten Trioxide.
Fujioka Y, et al.
The Journal of Physical Chemistry C, 117(15), 7506- 7510 (2013)
?Writing-Reading-Erasing? on tungsten oxide films using the scanning electrochemical microscope
Turyan I, et al.
Advanced Materials, 12(5), 330-333 (2000)
Electrochromic tungsten oxide films: review of progress 1993-1998
Granqvist CG
Solar Energy Materials and Solar Cells, 60(3), 201-262 (2000)
Structural Properties of Pure and Nickel-Modified Nanocrystalline Tungsten Trioxide.
Fujioka Y, et al.
The Journal of Physical Chemistry C, 116(32), 17029-17039 (2012)
Chemical vapor synthesis (CVS) of tungsten nanopowder in a thermal plasma reactor
Ryu T, et al.
International Journal of Refractory Metals & Hard Materials, 27(1), 149-154 (2009)
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Questions

1–4 of 4 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  3. What is the size distribution for this particles? Can I observe them via AFM?

    1 answer

    1. Unfortunately, the size distribution of Product 550086 has not been tested. However, 100 nm particles should be visible in AFM.

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  4. Hi, I am interested to purchase these nanoparticles, is it possible to see the TEM images? I need spherical nanoparticles and could not see an indication of the shape. And lastly, are they stored in water? Thank you very much. Best regards

    1 answer

    1. These nanoparticles are generally spherical.

      See the TEM image below.

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