Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 18, Pages 16639-16646Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03579
Keywords
micromotors; asymmetry; homojunctions; mass production; photocatalytic degradation
Funding
- National Natural Science Foundation of China [21875175, 21474078, 21705123, 51521001]
- Fundamental Research Funds for the Central Universities [WUT: 2017111028, 2018111012]
- Top Talents Lead Cultivation Project
- Natural Science Foundation of Hubei Province [2015CFA003]
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The key principle of designing a micro/nanomotor is to introduce asymmetry to a micro/nanoparticle. However, micro/nanomotors designed based on external asymmetry and inherent chemical and geometrical asymmetry usually suffer from tedious small-scale preparation, high cost, and/or complexity of external power and control devices, making them face insurmountable hurdles in practical applications. Herein, considering the possible distinct properties of different polymorphs, we propose a novel design strategy of simple-structured micromotors by introducing inherent asymmetry in crystalline phases. The inherent phase asymmetry can be easily introduced in spherical TiO2 particles by adjusting the calcination temperature to control the phase transition and growth of primary grains. The as-designed anatase/rutile TiO2 micromotors not only show efficient autonomous motions controlled by light in liquid media stemming from the asymmetric surface photocatalytic redox reactions but also have a promising application in environmental remediation due to their high photocatalytic activity in on-the-fly degradation of organic pollutants, facile large-scale fabrication, and low cost. The proposed design strategy may pave the way for the large-scale productions and applications of micro/nanomotors.
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