A novel route to fabricate belt-like VO2(M)@C core-shell structured composite and its phase transition properties

Belt-like VO2(M)@C core-shell structured composite was successfully fabricated by the thermal treatment with V3O7·H2O@C composite under a flow of Ar gas at 500 °C for 12 h. The processes of the formation of VO2(M)@C were briefly discussed. The core exhibited monoclinic phase VO2(M) and the carbon coated on the surface of VO2(M) was amorphous. The as-obtained VO2(M)@C composite consisted of belt-like shape with width ranging from 50 to 250 nm, length ranging from a few hundred nanometers to several micrometers and the thickness of carbon was about 18.5 nm on average. Furthermore, the phase transition property of VO2(M)@C was measured by DSC, revealing that VO2(M)@C also had the reversible first-order metal-to-insulator transition in the case of VO2(M).

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► A novel route was developed to fabricate VO2(M)@C.
► Belt-like VO2(M)@C core-shell structured composite was synthesized for the first time.
► The process of the formation of VO2(M)@C is briefly discussed.
► VO2(M)@C core-shell composite owns the phase transition property of VO2(M).