Journal
ACS NANO
Volume 11, Issue 8, Pages 7679-7689Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b07477
Keywords
directed assembly; electrophoresis; fluidic assembly; concentration gradient; nanoparticles; nanotubes
Categories
Funding
- National Science Foundation Nanoscale Science and Engineering Center (NSEC) (NSF) [EEC-0832785]
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Conductive or semiconducting nanomaterials-based applications such as electronics and sensors often require direct, placement of such nanomaterials on insulating surfaces.. Most fluicdic-based directed assembly techniques on insulating surfaces utilize capillary force and evaporation but are diffusion limited and slow. Electrophoretic-based assembly, on the other hand, is fast but can only be utilized for assembly on a conductive surface. Here, we present a directed assembly technique that enables rapid assembly of nanomaterials on insulating surfaces. The approach leverages and combines fluidic and electrophoretic assembly by applying the electric field through an insulating surface via a conductive film underneath. The approach (called electro-fluidic) yields an assembly process that is 2 orders of magnitude faster compared to fluidic assembly. By understanding the forces on the assembly process, we have demonstrated the controlled assembly of various types of nanomaterials that are conducting, semiconducting, and insulating including nanoparticles and single-walled carbon nanotubes on insulating rigid and flexible substrates. The presented approach shows great promise for making practical devices in miniaturized sensors and flexible electronics.
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