| 초록 |
Light-powered micro/nanomotors are based on photocatalytic behavior, in which fuel is degraded to become a power source. Titanium dioxide (TiO2) is the most well-known photocatalytic material and frequently used in micromotors, but large bandgap energy (3.2eV) of TiO2 limits visible-light absorption. In this study, we fabricated a visible-light-powered TiO2-based Janus-type micromotors (TJMs) in which a conjugated polymer (CP) capable of absorbing visible-light was introduced asymmetrically into the TiO2 particle hemisphere. The wax-in-water Pickering emulsion method was used to introduce CP into TiO2 particles as Janus-type. TiO2 and CP were attached by electrostatic attraction, and electrons and holes were generated when the CP absorbed visible-light. As a result, in a solution containing hydrogen peroxide (H2O2) as fuel, the generated holes oxidized H2O2 to produce oxygen, and the generated oxygen was used as a power source of TJMs to be propelled by absorbed visible light. |
