30 mg solid state GO was dissolved in 100 mL deionized water, and
sonicated for 2 h until the solution becameclear and no precipitate present.
Then 3 g of TiO2 powder was added into the GO dispersions and
stirred for 1 h in ultrasonic horn for a homogeneous suspension.
500 mg of VC was added to the solution. The as-prepared solution was
vigorously stirred for 48 h at room temperature. As the color of the solution
turned from yellowish to grayish, GO reduced to graphene.
Then, centrifugation was conducted several times withwater and ethanol
to remove remaining VC and other chemicals from the solution.
Finally, the remains were dried in a vacuum dryer at 65 °C. As such,
RGO–TiO2 nanocomposite with 1.0 wt.% RGO was prepared. 0.25, 0.5,
0.75, 1.25 wt.% RGO–TiO2 nanocomposites were prepared in the same
manner.