Microswimmers from Scalable Galvanic Displacement

Unified Synthetic Approach to Silver Nanostructures by Galvanic Displacement Reaction on Copper: From Nanobelts to Nanoshells

We report a unified nontemplate approach to a variety of silver nanostructures, including nanobelts, dendrites, nanodisks, and nanoshells. The growth of these silver nanostructures occurs by galvanic displacement initiated by short-circuited nanobatteries formed between the copper nano/microparticles and protruding silver “seeds” on their surface. The silver nanostructures share analogous struc...

MRI driven magnetic microswimmers.

Capsule endoscopy is a promising technique for diagnosing diseases in the digestive system. Here we design and characterize a miniature swimming mechanism that uses the magnetic fields of the MRI for both propulsion and wireless powering of the capsule. Our method uses both the static and the radio frequency (RF) magnetic fields inherently available in MRI to generate a propulsive force. Our st...

Novel Ag/Si composite particles through galvanic displacement and its conductive application

Here we synthesized a novel Ag/Si composite sub-micro particle using galvanic displacement by capitalizing on the active chemical surface of Si particles sludge from wafer-slicing process. Si works as chemical reactant, as well as reaction site to form composite particles. Sequent structural characterizations and analysis which include X-ray diffraction, transmission electron microscopy, scanni...

Copper deposition onto silicon by galvanic displacement: Effect of Cu complex formation in NH4F solutions

Copper was deposited onto rotating Si substrates by galvanic displacement in 6.0M NH4F to determine the effects of Cu complex formation on deposition rates. Deposition rates decreased with increasing rotation speed, indicating that Cu(I) intermediates, stabilized by NH3, diffuse away from the Cu surface before they reduce to Cu(0). UV–visible spectra of contacting solutions and direct measureme...

Synthesis and patterning of gold nanostructures on InP and GaAs via galvanic displacement.