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Title: Preparation of tungsten oxide

Patent ·
OSTI ID:988694
 [1];  [2];  [2];  [3];  [3]
  1. Yankton, SD
  2. Los Alamos, NM
  3. Jemez Springs, NM
+ Show Author Affiliations

Tungsten trioxide hydrate (WO.sub.3.H.sub.2O) was prepared from a precursor solution of ammonium paratungstate in concentrated aqueous hydrochloric acid. The precursor solution was rapidly added to water, resulting in the crash precipitation of a yellow white powder identified as WO.sub.3.H.sub.2O nanosized platelets by x-ray diffraction and scanning electron microscopy. Annealing of the powder at 200.degree. C. provided cubic phase WO.sub.3 nanopowder, and at 400.degree. C. provided WO.sub.3 nanopowder as a mixture of monoclinic and orthorhombic phases.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-36
Assignee:
Los Alamos National Security, LLC (Los Alamos, NM)
Patent Number(s):
7,591,984
Application Number:
10/629,489
OSTI ID:
988694
Country of Publication:
United States
Language:
English

References (11)

The observation of cubic tungsten trioxide at high-temperature dehydration of tungstic acid hydrate journal May 2001
H2S response of WO3 thin-film sensors manufactured by silicon processing technology journal April 1994
Structural and gas-sensing properties of WO/sub 3/ nanocrystalline powders obtained by a sol-gel method from tungstic acid journal August 2002
Development of tungsten oxide hydrate phases during precipitation, room temperature ripening and hydrothermal treatment journal November 2002
Study of WO3-based sensing materials for NH3 and NO detection journal July 2000
Aqueous precursors for electrochromic tungsten oxide hydrates journal April 1996
Tungsten Oxide-Based Semiconductor Sensor Highly Sensitive to NO and NO 2 journal September 1991
Preparation and characterization of pyrolytic spray deposited electrochromic tungsten trioxide films journal January 2000
Effect of grafting sequence on the behavior of titania-supported v VO-WO catalysts in the selective reduction of NO by NH journal June 2000
Microstructure and properties of sol-gel deposited WO3 coatings for large area electrochromic windows journal May 1993
Synthesis of tungsten trioxide hydrates and their structural properties journal August 2000

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY