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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)

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

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