Ionic liquid assisted Synthesis and Characterization of metallic Molybdenum and Molybdenum oxide nanoparticles

Alexander Madu

Ionic liquid assisted Synthesis and Characterization of metallic Molybdenum and Molybdenum oxide nanoparticles

Alexander Madu * §

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§ Crawford University,Nigeria

Ionic liquid assisted Synthesis and Characterization of metallic Molybdenum and Molybdenum oxide nanoparticles

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Abstract

Nanostructured Mo and MoO3 colloidal dispersions have been obtained reproducibly through reduction of ammonium molybdate by sodium borohydride in ionic liquids. When (NH4)6Mo7O24.4H2O is reduced by NaBH4 in both 1-ethyl-3-methyl imidazolium dicyanamide and 1-butyl-3- methylimidazoliumdicyanamide at 180oC, nanostructured MoO3 formed as the major phase. The XRD pattern confirmed the crystalline nature of the material. The most representative reflections of MoO3 (JCPDS: 47-1081) were indexed in monoclinic crystal system (space group P2 1/c (14) Y-unique) . The average mean diameter of 53.8nm was calculated using Debye-Scherrer equation from full width at halfmaximum (FWHM) of (111), (-311), (160), (-421), (330) and (413) planes for material in IL EmimN(CN)2. But in BmimN(CN)2 the diameter was estimated to be 40.8nm. When the reduction was carried out in EmimOTf and BmimOTf, the products consists of metallic molybdenum and MoO3. The crystalline phase of MoO3 is rodlike and is determined to be orthorhombic, space group Pbnm(62) with the cell dimensions [a=3.963, b=13.856, c=3.696 Ǻ.; Vol.=203. Ǻ3, Z=4, ρ=4.7096gcm-1] corresponding to MoO3 (JCPDS: (35-0609). The average diameter of 51.0 and 48.9nm was calculated respectively for particles in IL EmimOTf. UV-Visible absorption spectra of the fraction in ionic liquid dispersed in ethanol .shows that the predominant feature in the spectra is the spin-allowed ligand-to-metal charge transfer (LMCT) from O2- ion tiu orbital to a d0 eg orbital, which is observed in the range 200-300nm centred at 212nm in the UV region. This strongly indicates the presence of metallic Molybdenum with particle size less than 100nm.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Alexander Madu. 1969. "Ionic liquid assisted Synthesis and Characterization of metallic Molybdenum and Molybdenum oxide nanoparticles". Global Journal of Science Frontier Research, Global Journal of Science Frontier Research - B: Chemistry GJSFR-B Volume 12 (GJSFR Volume 12 Issue B1).

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Journal Specifications

Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

Keywords

aggregates crystalline Ionic liquid Molybdenum nanostructured

Classification

GJSFR-B Classification FOR Code: 030302

030204

Submission ReceivedNovember 27, 2011
Peer Review Double Blind
Handling Editor
Accepted December 22, 2011
Published January 1, 2012

Version of record

v1.2

Language

English

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Article Matrices

Total Score: 157

Country: Nigeria

Subject: Global Journal of Science Frontier Research

Authors: Dr.Madu, A. N, Ayi, A. Ayi, Njoku, M I, Iwuoha, G. N. (PhD/Dr. count: 1)

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Publish Date: 2012 01, Sun

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