Electrochemically assembled quasi-periodic quantum dot arrays

Abstract

Abstract. We describe two electrochemical self-assembly processes for producing highly ordered quasi-periodic arrays of quantum dots on a surface. The advantages of these techniques are: (i) they are 'gentle' and do not cause radiation damage to nanostructures unlike beam lithography, (ii) they have high throughput and are amenable to mass production unlike direct-write lithography, (iii) structures can be delineated on non-planar substrates, and (iv) the techniques are potentially orders of magnitude cheaper to implement than conventional nanosynthesis. Samples produced by these techniques have been characterized by microscopy, optical and transport measurements, Auger and x-ray. These measurements reveal intriguing properties of the nanostructures. In this paper, we describe our initial results and show the promise of such techniques for low-cost and high-yield nanosynthesis.

The role of the Ti surface roughness in the self-ordering of TiO2 nanotubes: a detailed study of the growth mechanism

“…This shallow ripple-like structure is an EP characteristic of metals 40 and can be used as a pre-pattern prior to anodization to obtain highly ordered oxide nanostructures, as shown in the case of Al. 36,40,[42][43][44][45] The electrochemical polishing of Ti is usually achieved in sulphuric acid-based electrolytes, which results in smooth surfaces. 46 However, in this work the EP conditions used (electrolyte type and voltage) resulted in organized dimple patterns, 40 with an interripple spacial period = 97 nm [ Fig …”

Vibrational Modes of Nano-Template Viruses

“…[4][5] Self-assembly using chemically produced templates is another promising approach. [6][7] But, though in lesser degree, it also suffers from the same problem: nanopores are also not identical in size.…”

Structure and magnetization of arrays of electrodeposited Co wires in anodic alumina

“…The disadvantage of these techniques is that they are expensive and it is time consuming to write nanostructures on large scales, although recently 1 optical interference techniques are being developed to circumvent this problem. Another way to fabricate large scale periodic nanostructures is by electrodeposition of magnetic materials in the pores of nuclear track etched polycarbonate membranes [2][3][4][5][6] or in the pores of self-ordered nanochannel material formed by anodization of Al in an acid solution, [7][8][9][10] a low cost and fast technique to produce large arrays of identical magnetic entities, with a very large aspect ratio ͑length divided by diameter͒, which is not possible with standard lithographic techniques. Wires in anodic alumina have the advantage above wires in polycarbonate membranes in that they are completely parallel and exactly perpendicular to the membrane surface and, moreover, the wires are assumed to have a constant diameter 11 throughout their entire length.…”