Engineering the Dynamics of Active Colloids by Targeted Design of Metal–Semiconductor Heterojunctions
Engineering the Dynamics of Active Colloids by Targeted Design of Metal–Semiconductor Heterojunctions
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DOI：
10.1002/admi.201801894
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发表时间：
2019-02
影响因子：
5.4
通讯作者：
J. Gibbs;S. Sarkar;Andrew Leeth Holterhoff;Mingyang Li;John Castañeda;Justin Toller
中科院分区：
文献类型：
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作者：
J. Gibbs;S. Sarkar;Andrew Leeth Holterhoff;Mingyang Li;John Castañeda;Justin Toller
自推进胶体被引导成为分子发动机和机器的放大、纳米和微米级无机类似物。为了实现利用这种活性颗粒形成真正的人造小型机械的宏伟目标，必须提供能够实现广泛运动行为的显著多样化的颗粒类型库。在这里，它表明，光活化，自泳粒子的动力学可以通过有针对性的设计金属-半导体异质结。这种效应用三种不同的微泳器来证明，微泳器由一个细长的半导体尾部组成，尾部由二氧化钛制成;否则，这三种微泳器在尾部的不同位置上都是相同的，没有气相沉积的金涂层。异质结的具体位置决定了每种类型的游动行为。虽然这里只关注一种形状和材料组合，但工程化具有位点特异性金属-半导体异质结的活性颗粒是用于在活性胶体物质中实现所需运动学行为的通用技术。
Self‐propelled colloids are primed to become scaled up, nano‐ and microscale inorganic analogues of molecular motors and machines. In order to advance toward the ambitious goal of employing such active particles to form genuine man‐made small scale machinery, a significantly diversified library of particle types, capable of a wide range of motive behaviors, must be available. Here, it is shown that the dynamics of photoactivated, self‐phoretic particles can be engineered by targeted design of metal–semiconductor heterojunctions. This effect is demonstrated with three different microswimmers consisting of an elongated semiconducting tail made from anatase titanium dioxide; all three of which would otherwise be identical absent vapor‐deposited coatings of gold at different locations on the tails. The specific location of the heterojunction determines the swimming behavior for each type. Although here only one shape and material combination is focused upon, engineering active particles with site‐specific metal–semiconductor heterojunctions is a general technique for achieving desired kinematic behavior in active colloidal matter.