Organic assisted hydrothermal route to MoO{sub 2}/HDA composite microspheres and their characterization

Journal Article · Mon Dec 01 04:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2008.02.016· OSTI ID:21195024

Nagaraju, G ^[1]; Thipperudraiah, K V ^[2]

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1. Department of Chemistry, Central College Campus, Bangalore University, Bangalore 560001 (India)
2. Department of Physics, Ambedkar First Grade College, Bangalore 560008 (India)

Synthesis of molybdenum oxide/hexadecylamine (MoO{sub 2}/HDA) microspheres in aqueous solution has been investigated systematically by varying the concentration of the precursor, surfactant and reducing agent, as well as the reaction temperature and duration. To understand this, the nature of the solid has been probed by PXRD, FTIR, UV-visible and SEM equipped with an EDS. The PXRD patterns of as-prepared products reveal that MoO{sub 2} microspheres are of monoclinic structure. The bands at 985 and 952 cm{sup -1} reflect the {nu}(Mo-O) stretch vibration of terminal -Mo{sup VI}=O{sub t} and -Mo{sup IV}=O{sub t} groups. UV-vis spectrum of calcined sample exhibits maximum absorption at 358 nm. SEM images reveal that the average diameters of the MoO{sub 2} microspheres are in the range 1-3 {mu}m. The reduction of the precursor yields a metastable poorly crystalline oxide of lower valence molybdenum, which is crystallized to {alpha}-MoO{sub 3} on calcination to 400 deg. C.

• OSTI ID: 21195024
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
AQUEOUS SOLUTIONS
CALCINATION
INFRARED SPECTRA
MICROSPHERES
MOLYBDENUM
MOLYBDENUM OXIDES
MONOCLINIC LATTICES
REDUCING AGENTS
REDUCTION
SCANNING ELECTRON MICROSCOPY
SURFACTANTS
SYNTHESIS
X-RAY DIFFRACTION