W
6O
19-epoxy resin complexes with different W : C molar ratios, I, II and III, were prepared by the reaction of tetrabutylammonium hexatungstate, dyglycidyl ether of bisphenol A and phthalic anhydride. The microwave treatment of complexes I, II and III gave nano-sized WO
3, WO
2, W
2C, WC and/or W / carbon composite materials Ic-IIIc. The heating of Ic-IIIc under an oxygen atmosphere gave nano-sized WO
3 / carbon composite materials Ic-O-IIIc-O. The ESR spectral examinations suggest the possibility of an electron transfer from WO
3 particles to carbon. Visible light-responsive oxidation-reduction functions of the oxidized composite materials were examined.
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