Janus micromotors as tiny nanoparticle factories

Self-propelled Janus particles loaded with Cd2+ or citrate make CdS quantum dots or gold nanoparticles in microliter volumes within 15 minutes.

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What new use of Janus micromotors is demonstrated?

All-in-one mobile microreactors for nanoparticle synthesis.

How are CdS quantum dots made?

Cd2+-loaded motors plus ATP as cap/stabilizer in sulfide media.

How are AuNPs made?

Citrate- or HAuCl4-loaded microreactors navigating gold or citrate solutions.

How much can reagent/waste volumes shrink?

To less than 800 μL.

How does citrate-mode time compare with vessels?

15 min versus 24 h for conventional gold NP synthesis.

What fuels bubble propulsion in control experiments?

30% H2O2.

What catalytic test probes AuNP quality?

Reduction/degradation of 4-nitrophenol after lipase digestion of the motor body.

Do moving motors outperform static ones in that test?

Nearly 100% 4-nitrophenol degradation for bubble-moving motors versus stirred/static.

What nanoparticles enable propulsion and magnetic steering?

PtNPs for autonomous propulsion and Fe3O4 for on-demand transport.

What happens to NP size and activity?

They can be modulated by controlling microreactor motion.

What cheaper propulsion catalyst do authors suggest?

Replace PtNPs with MnO2.