Photoresponsive MoS<sub>2</sub> and WS<sub>2</sub> microflakes as mobile biocide agents

Asunción-Nadal, Víctor de la; Bujalance-Fernández, Javier; Jurado‐Sánchez, Beatriz; Escarpa, Alberto

doi:10.1039/d3nr00349c

Cited by 5 publications

(1 citation statement)

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“…Therefore, this type of displacement occurs from cold to hot regions . Visible light-activated photophoretic swarming micromotors have been demonstrated to enhance catalytic efficiency for pollutant remediation and bacterial inactivation. , …”

Section: Introductionmentioning

confidence: 99%

Janus Micromotors for Photophoretic Motion and Photon Upconversion Applications Using a Single Near-Infrared Wavelength

Mena-Giraldo,

Kaur,

Maurizio

et al. 2024

ACS Appl. Mater. Interfaces

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External stimuli can trigger changes in temperature, concentration, and momentum between micromotors and the medium, causing their propulsion and enabling them to perform different tasks with improved kinetic efficiencies. Light-activated micromotors are attractive systems that achieve improved motion and have the potential for high spatiotemporal control. Photophoretic swarming motion represents an attractive means to induce micromotor movement through the generation of temperature gradients in the medium, enabling the micromotors to move from cold to hot regions. The micromotors studied herein are assembled with Fe 3 O 4 nanoparticles, and NaGdF 4 :Yb 3+ ,Er 3+ /NaGdF 4 :Yb 3+ and LiY-F 4 :Yb 3+ ,Tm 3+ upconverting nanoparticles. The Fe 3 O 4 nanoparticles were localized to one hemisphere to produce a Janus architecture that facilitates improved upconversion luminescence with the upconverting nanoparticles distributed throughout. Under 976 nm excitation, Fe 3 O 4 nanoparticles generate the temperature gradient, while the upconverting nanoparticles produce visible light that is used for micromotor motion tracking and triggering of reactive oxygen species generation. As such, the motion and application of the micromotors are achieved using a single excitation wavelength. To demonstrate the practicality of this system, curcumin was adsorbed to the micromotor surface and degradation of Rhodamine B was achieved with kinetic rates that were over twice as fast as the static micromotors. The upconversion luminescence was also used to track the motion of the micromotors from a single image frame, providing a convenient means to understand the trajectory of these systems. Together, this system provides a versatile approach to achieving light-driven motion while taking advantage of the potential applications of upconversion luminescence such as tracking and detection, sensing, nanothermometry, particle velocimetry, photodynamic therapy, and pollutant degradation.

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Section: Introductionmentioning

confidence: 99%

Janus Micromotors for Photophoretic Motion and Photon Upconversion Applications Using a Single Near-Infrared Wavelength

Mena-Giraldo,

Kaur,

Maurizio

et al. 2024

ACS Appl. Mater. Interfaces

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Advanced micromotor platforms for water quality detection and remediation

Chen,

Qiu,

Chang

et al. 2024

Journal of Environmental Chemical Engineering

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Photophoretic MoS₂–Fe₂O₃ Piranha Micromotors for Collective Dynamic Microplastics Removal

de la Asunción-Nadal,

Solano,

Jurado-Sánchez

et al. 2024

ACS Appl. Mater. Interfaces

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Microplastics are highly persistent emerging pollutants that are widely distributed in the environment. We report the use of MoS 2 @Fe 2 O 3 core−shell micromotors prepared by a hydrothermal approach to explore the degradation of plastic microparticles. Polystyrene was chosen as the model plastic due to its wide distribution and resistance to degradation using current approaches. Micromotors show photophoretic-based motion at speeds of up to 6 mm s −1 and schooling behavior under full solar light spectra irradiation without the need for fuel or surfactants. During this impressive collective behavior, reactive oxygen species (ROS) are generated because of the semiconducting nature of the MoS 2 . Degradation of polystyrene beads is observed after 4 h irradiation because of the synergistic effect of ROS production and localized heat generation. The MoS 2 @Fe 2 O 3 micromotors possess magnetic properties, which allow further cleaning and removal to be carried out after irradiation through magnetic pulling. The new micromotors hold considerable promise for full-scale treatment applications, only limited by our imagination.

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Photoresponsive MoS₂ and WS₂ microflakes as mobile biocide agents

Abstract: A fuel-free strategy for the eradication of Escherichia coli and Staphylococcus aureus biofilms using WS2 and MoS2 photophoretic microflakes is described. The microflakes are prepared by liquid-phase exfoliation of the...

Cited by 5 publications

References 40 publications

Janus Micromotors for Photophoretic Motion and Photon Upconversion Applications Using a Single Near-Infrared Wavelength

Janus Micromotors for Photophoretic Motion and Photon Upconversion Applications Using a Single Near-Infrared Wavelength

Advanced micromotor platforms for water quality detection and remediation

Photophoretic MoS₂–Fe₂O₃ Piranha Micromotors for Collective Dynamic Microplastics Removal

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Photoresponsive MoS2 and WS2 microflakes as mobile biocide agents

Abstract: A fuel-free strategy for the eradication of Escherichia coli and Staphylococcus aureus biofilms using WS2 and MoS2 photophoretic microflakes is described. The microflakes are prepared by liquid-phase exfoliation of the...

Cited by 5 publications

References 40 publications

Janus Micromotors for Photophoretic Motion and Photon Upconversion Applications Using a Single Near-Infrared Wavelength

Janus Micromotors for Photophoretic Motion and Photon Upconversion Applications Using a Single Near-Infrared Wavelength

Advanced micromotor platforms for water quality detection and remediation

Photophoretic MoS2–Fe2O3 Piranha Micromotors for Collective Dynamic Microplastics Removal

Contact Info

Product

Resources

About

Photoresponsive MoS₂ and WS₂ microflakes as mobile biocide agents

Photophoretic MoS₂–Fe₂O₃ Piranha Micromotors for Collective Dynamic Microplastics Removal