preparation of aqueous sols of tungsten oxide dihydrate

... development and application of the functional inorganic materials. 72 Y G. Choi et al. / Sensors and Actuators B 87 (2002) 63–72 Preparation of aqueous sols of tungsten oxide dihydrate from sodium ... accepted 20 May 2002 Abstract Aqueous sols of tungsten oxide dihydrate (WO 3 Á2H 2 O) were prepared from Na 2 WO 4 by an ion-exchange method. An aqueous solution...

Ngày tải lên: 20/03/2014, 13:06

... study of ferrofluid suspensions [34a,43], the birefringence and the magnetization of a suspension of goethite particles can be B.J. Lemaire et al.: Physical properties of aqueous suspensions of goethite ... Physical properties of aqueous suspensions of goethite (α-FeOOH) nanorods (Part I) 301 01234 0.00 0.01 0.02 M (A.m 2 /kg) B (T) Fig. 9. Remanent magnetisation (per kg of...

Ngày tải lên: 20/03/2014, 13:06

... [2,3]. Nanostructures of well-established gas sensing materials like tin oxide [4–6], zinc oxide [7], tungsten oxide [8–10], titanium oxide [11,12], and indium oxide [13,14] have shown higher sensitivity, faster ... the synthesisof tungsten oxide nanorods assembled microspheres by a facile hydrothermal method. To our knowledge, there isno report on thegas sensing of the mi...

Ngày tải lên: 19/03/2014, 16:48

... properties of nanocrystalline tungsten oxide synthesized by acid precipi- tation method, Sens. Actuators B: Chem. (2010), doi:10.1016/j.snb.2010.06.053 ARTICLE IN PRESS G Model SNB-12436; No. of Pages ... calcinations are in the range of 30–150 nm. The gas sensing properties of these powders in the form of thick film were investigated with and without platinum doping. Gas respons...

Ngày tải lên: 19/03/2014, 16:48

... formation mechanism of tungsten oxide nanobelts is proposed. © 2006 Elsevier B.V. All rights reserved. Keywords: Hydrothermal; Tungsten oxide; Nanobelts 1. Introduction As a new family of one-dimensional ... its rich chemical intercalation reactivity. However, studies of tungsten oxides nanobelts were comparatively rare because of lack of preparation methods for such mate...

Ngày tải lên: 20/03/2014, 13:04

... supersaturation oftungsten source, promoting the growth of tungsten oxide nanowires [23]. At higher concentration, the highly saturated WCl 6 could prohibit the growth of tungsten oxide nanowires ... images of tungsten oxide nanostructures synthesized at WCl 6 concentration of 0.01M, 0.015M and 0.02 M, respectively, after annealing at 300 ◦ C for 1h. (b) TEM image of the...

Ngày tải lên: 20/03/2014, 13:04

... nanosize in the continuity of tungsten oxide frameworks. According to the previous study of electrochromic oxides [31], such type of nanostructure containing mesopores in tungsten oxides thin films may ... the surface oxidation states of the tungsten oxide thin film sample. Fig. 5a shows survey scans spectra recorded within a range of 0 and 1000 eV at a takeoff angle of 90...

Ngày tải lên: 20/03/2014, 13:08

... properties of the oxide nanorod itself as well as of inorganic derivatives prepared from the oxide. Herein we report a simple large-scale preparation of soluble and highly crystalline tungsten oxide ... stoichiometry of the prepared tungsten oxide nanorods, and it matches best the W 18 O 49 reflections (JCPDS card No: 05-0392) among various tungsten oxide systems. Fig...

Ngày tải lên: 20/03/2014, 13:08

... lower supersaturation of the tungsten source, promoting the growth of tungsten oxide nanowires [11]. At higher concentration, the highly saturated WCl 6 could prohibit the growth of tungsten oxide nanowires ... EDX profile of bundles synthesized at concentration of 0.007M. Fig. 2 – (a) TEM and (b) HRTEM images of bundled tungsten oxide nanowires synthesized at a conc...

Ngày tải lên: 20/03/2014, 13:08