A scheme for programmable nanoscale self-assembly that allows the precise arrangement of components in 2D or 3D
geometries would have a wide range of applications. The ultrasmall size and programmability of the nucleotide subunits
in DNA offer a versatile basis for such a scheme. In this paper, I discuss recent steps toward nanocomponent assembly
by 2D DNA scaffolding, including 1) incorporation of 1.6-nm Au nanoparticles in a 2D DNA scaffolding, 2) in situ
assembly of 5-nm metallic nanoparticle arrays with precisely controlled dimensions and 3) sequence-encoded assembly
of different sized nanocomponents in a common scaffolding. In the near term, this ability to precisely assemble
nanocomponent arrays could enable the study of electronic, magnetic and plasmonic interactions among particles in a
regime where quantum confinement, Coulomb blockade, and magnetic effects play important roles. Eventually, such
self-assembly techniques could lead to a manufacturing technology for nanoelectronics, nanophotonics, and
nanosensing.
A novel self-aligned technique for 0.15 ?m gate length AlInAs-GalnAs HEMTs has been demonstrated. Devices with an oxide sidewall yielded an fT of 177 GHz whereas devices with no sidewall exhibited an fT greater than 250 GHz.
The difference has been related to process damage during plasma deposition of SiO2. An extrinsic fT of 292 GHz was measured at 77K.
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