Chaining and dendrite formation of gold particles

Yuan, Yong J.; Andrews, Mike K.; Marlow, Barry K.
July 2004
Applied Physics Letters;7/5/2004, Vol. 85 Issue 1, p130
Academic Journal
Using the time-averaged dielectrophoretic force from an applied electric field, we have observed the assembly of gold colloid particles into nano/microwires, connections and dendrites according to location within different field regions of a lithographically patterned array of microelectrodes. The frequency of the fields has a marked effect on the structures. In situ inverse microscopy showed hydrodynamic flows, which probably arise from local heating and which play a significant part in shapes formed. Understanding and using the effects will allow the controlled fabrication and positioning of micro- and nanowires or connections at densities far above what is now achievable.


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