2013
DOI: 10.1002/ppsc.201300260
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Microwell‐Directed Self‐Assembly of Vertical Nanowire Arrays

Abstract: Vertical arrays of anisotropic particles are desired for many applications including solar cells, battery electrodes, and lasers. Partially etched nano­wires (PENs) are hybrid silica nanotube/nanowires with partial metallic cores. These particles spontaneously form vertical arrays in which on average 70% of the particles are oriented perpendicular to the underlying substrate. Here, we perform PEN self‐assembly on lithographically prepared substrates patterned with square microwells having dimensions comparable… Show more

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Cited by 3 publications
(7 citation statements)
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“…Vertically oriented nanowires, with long axes perpendicular to a substrate, are straightforward to produce during synthesis by growth or etching from a substrate, ,, but such structures have been less-studied for self-assembly of pre-existing nanowires from solution. Approaches to vertical nanowire assembly have included controlled drying, particle designs that take advantage of gravity and interparticle forces, substrate patterning with microwells smaller than the nanowire length, and applied magnetic or electric fields. , Of these, strategies based on applied electric field are particularly versatile in terms of particle size and composition while also offering the possibility of dynamic reconfigurability by changing the applied field conditions. We therefore chose to take advantage of applied electric fields in the work described here.…”
Section: Introductionmentioning
confidence: 99%
“…Vertically oriented nanowires, with long axes perpendicular to a substrate, are straightforward to produce during synthesis by growth or etching from a substrate, ,, but such structures have been less-studied for self-assembly of pre-existing nanowires from solution. Approaches to vertical nanowire assembly have included controlled drying, particle designs that take advantage of gravity and interparticle forces, substrate patterning with microwells smaller than the nanowire length, and applied magnetic or electric fields. , Of these, strategies based on applied electric field are particularly versatile in terms of particle size and composition while also offering the possibility of dynamic reconfigurability by changing the applied field conditions. We therefore chose to take advantage of applied electric fields in the work described here.…”
Section: Introductionmentioning
confidence: 99%
“…In horizontal assemblies, PEN core patterns lead to variations in VDW attractions along the particle length, which influences their relative orientations . PENs with metal cores at one end and large terminal etched segments adopt vertical orientations (metal core down) that maximize VDW attractions between adjacent particles …”
Section: Introductionmentioning
confidence: 99%
“…Understanding how interactions of similar and dissimilar particles affects assembly outcomes will enable "by design" production of multicomponent structures for desired applications.We have previously introduced partially etched nanowires (PENs) as a model system to understand the interparticle forces that drive assembly of shape-and composition-anisotropic particles. [19][20][21][22] PENs are hybrid nanotube/nanowire particles, generally ≈300 nm diameter, and ranging from 2 to 12 µm length, consisting of a silica shell and a partial metal core. [19][20][21][22] Like solid nanowires of similar dimensions, PENs sediment from aqueous suspension under the action of gravity, leading to high surface concentrations on an underlying substrate.…”
mentioning
confidence: 99%
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