Synthesis of homogeneously dispersed cobalt nanoparticles in the pores of functionalized SBA-15 silica
2012 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 221, no S1, 359-364 p.Article in journal (Refereed) Published
Cobalt nanoparticles were prepared at room temperature by reducing cobalt sulfate heptahydrate with sodium borohydride and using functionalized SBA-15 mesoporous silica as a hard template. It was found that both external and internal fuctionalization of silica walls play a crucial role on the infiltration and reaction of the reagents in the silica framework. Subsequent heat treatment of the impregnated silica at 500 °C in air or nitrogen atmospheres leads to growth of crystals of the deposited cobalt and formation of cobalt and cobalt oxide nanoparticles, respectively. Dissolution of the silica template by NaOH resulted in well dispersed Co and Co3O4 nanoparticles ranging in size from 2 to 4 nm. The functionalization of the silica was studied by FTIR, N2-physisorption, and thermogravimetric techniques and the obtained nanoparticles were characterized by XRD, TEM and EDX analysis.
Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 221, no S1, 359-364 p.
Functionalization; Cobalt; Cobalt oxide; Nanoparticles; SBA-15 silica; Sodium borohydride
IdentifiersURN: urn:nbn:se:liu:diva-67917DOI: 10.1016/j.powtec.2012.01.025ISI: 000303222300046OAI: oai:DiVA.org:liu-67917DiVA: diva2:414221
funding agencies|Swedish International Development Cooperation Agency, Sida||2011-05-022011-05-022013-10-02Bibliographically approved