Shape Engineering of TiO₂ Microrobots for “On‐the‐Fly” Optical Brake

Abstract

the experiments, 5 µL of ultrapure water (18 MΩ cm) containing the microrobots was dropped on a glass slide, followed by the addition of H 2 O 2 solution. After recording videos of the microrobots at 20 fps without/with UV irradiation, NIS-Elements Advanced Research software was used to calculate the average speed values.Research data are not shared.

Trapping and detecting nanoplastics by MXene-derived oxide microrobots

“…The continuous Pt coating on the flat side of the MXene-derived TiO 2 microparticle produces more H 2 compared to the discontinuous Pt coating on the multi-layered side, reflecting a larger H + concentration gradient and, so, a higher speed and 3D motion ability. This conclusion is consistent with the previously reported stronger propulsion for microrobots coated by a continuous Pt layer 27 , 53 , 54 .…”

“…In fact, for UV-light-powered Pt/ZnO Janus micromotors, it has been demonstrated that a smooth ZnO microparticle results in a continuous Pt coating and the fuel-free motion ability, while a rough ZnO microparticle leads to a discontinuous Pt coating which requires H 2 O 2 fuel for the autonomous propulsion 27 . Similarly, smooth TiO 2 microparticles coated by a continuous Pt layer exhibited a higher speed under UV-light-irradiation in H 2 O 2 than rough ones 53 . Moreover, it has been shown that transforming a continuous Pt film on SiO 2 microspheres into discrete Pt nanoparticles via thermal annealing causes an ~80% decrease in their self-electrophoretic speed due to the lower electric field or fluid flow generated by the discontinuous Pt coating 54 .…”

Light‐Propelled Nanorobots for Facial Titanium Implants Biofilms Removal

“…[11,22] In these conditions, the photocatalytic ability of B-TiO 2 to produce radicals and chemical species onto its surface is intensely improved, and the photogenerated electrons can oxidize H ) while reduction of protons and H 2 O 2 occurs at the metal side. [11,15,29,31,34,43] Contemporarily, H 2 O 2 and protons are reduced to water at the Ag side. The resulting gradient establishes a local electric field which causes the nanorobots to propel via the self-electrophoretic mechanism.…”

“…Among them, photocatalytic nanorobots are of particular interest since their motion can be controlled by irradiation or adjusting the incident light. [29][30][31][32][33] They also possess the ability to generate and release reactive oxygen species (ROS) capable of initiating photodegradation processes for improved therapeutic outcomes. [18,34] Recently, significant attention has also been devoted toward nanorobots that can be actuated by any portion of the available light spectrum to adapt them to the specific application.…”

Micro‐ and Nanorobots Meet DNA

“…Light-driven motion is primarily attractive for water remediation with photocatalytic semiconductors. [24][25][26][27] Enzymatic micro/nanorobots are more appropriate for biomedical applications but are limited to human body regions where a specific biomolecule is available. [28] Instead, magnetic manipulation offers high precision in the whole body without fuels.…”