Template free fabrication of hollow hematite spheres via a one-pot polyoxometalate-assisted hydrolysis process

Journal Article · Thu Feb 15 04:00:00 EST 2007 · Journal of Solid State Chemistry

OSTI ID:21015675

Baodong, Mao ^[1]; Zhenhui, Kang ^[1]; Chungui, Tian ^[1]; Zhiming, Zhang ^[1]; Chunlei, Wang ^[1]; Yanli, Song ^[1]; Meiye, Li ^[2]

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1. Institute of Polyoxometalate Chemistry, Department of Chemistry, Northeast Normal University, Changchun, Jilin 130024 (China)
2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Jilin 130022 (China)

Uniform hollow hematite ({alpha}-Fe{sub 2}O{sub 3}) spheres with diameter of about 600-700 nm and shell thickness lower than 100 nm are obtained by direct hydrothermal treatment of dilute FeCl{sub 3} and tungstophosphoric acid H{sub 3}PW{sub 12}O{sub 40} solution at 180 deg. C. The hollow spheres are composed of robust shells with small nanoparticles standing out of the surface and present a high-surface area and a weak ferromagnetic behavior at room temperature. The effect of concentration of H{sub 3}PW{sub 12}O{sub 40}, reaction time and temperature for the formation of the hollow spheres are investigated in series of experiments. The formation of the hollow spheres may be ascribed to a polyoxometalte-assisted forced hydrolysis and dissolution process. - Graphical abstract: Uniform hollow hematite ({alpha}-Fe{sub 2}O{sub 3}) spheres with diameter of about 600-700 nm and shell thickness lower than 100 nm are obtained by direct hydrothermal treatment of dilute FeCl{sub 3} and tungstophosphoric acid H{sub 3}PW{sub 12}O{sub 40} solution at 180 deg. C. The hollow spheres present a high surface area and weak ferromagnetic behavior at room temperature.

• OSTI ID: 21015675
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ADSORPTION
DESORPTION
DISSOLUTION
FABRICATION
HEMATITE
HYDROLYSIS
IRON CHLORIDES
IRON OXIDES
NANOSTRUCTURES
NITROGEN
PARTICLES
SOLUTIONS
SURFACE AREA
SURFACES
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TUNGSTOPHOSPHORIC ACID