铂基双面神微纳米马达运动的增强策略

Motion enhancement for platinum-based Janus micro-nanomotors

铂基微纳米马达制备简单,组成稳定,多作为典型体系开展化学驱动微纳米马达的相关研究。化学驱动微纳米马达的运动易受提供驱动力的化学反应的制约,很难在不改变燃料浓度的情况下实现运动速度的提升。将铂基双面神微纳米马达作为研究对象,探索化学驱动微纳米马达的运动增强策略;通过引入过渡金属氧化物层构建异质结,在聚苯乙烯微球(PS)@过渡金属氧化物(CuO或WO_(3))核壳粒子表面半包覆铂,构建PS@过渡金属氧化物-铂基双面神微纳米马达。结果表明:通过构建异质结,H_(2)O_(2)的催化转化速率得到提升,铂基双面神微纳米马达的运动速度从22μm/s提升至35μm/s,实现铂基双面神微纳米马达的运动增强,运动速度的提升取决于铂与过渡金属氧化物之间的电子迁移速率。

Platinum-based micro-nanomotors have been widely used as a typical system for conducting research on chemically-driven micro-nanomotors due to their simple preparation and stable composition.For chemically-driven micro-nanomotors,their motion is easily constrained by the chemical reaction providing the driving force,and it is difficult to achieve an increase in motion speed without changing the fuel concentration.In this study,platinum-based Janus micro-nanomotors were used as the research object to explore strategies for enhancing the motion of chemically-driven micro-nanomotors.By introducing a transition metal oxide layer to create a heterojunction,Pt was partially encapsulated on the surface of PS@transition metal oxide(CuO or WO_(3))core-shell particles to construct PS@transition metal oxide-Pt Janus micro-nanomotors.The results show that the catalytic conversion rate of H_(2)O_(2)is improved by constructing the heterojunction,and the motion speed of the platinum-based Janus micro-nanomotor is increased from 22μm/s to 35μm/s,achieving motion enhancement.The increase in motion speed depends on the electron transfer rate between Pt and transition metal oxide.