Nanoscale electronic device applications will require the arrangement of materials such as carbon nanotubes (CNT) and metal particles into networks, with precise control of the placement, orientation and spacing being essential. The scaffolded DNA nanostructures called DNA Origami (DO) can provide a flexible platform for performing supramolecular chemistry, generating complex architectures through the use of simple modifications. Structures have been formed which accommodate various biologically relevant molecules, metal nanoparticles, quantum dots and carbon nanotubes. Origami can themselves be assembled into larger structures extending their potential for small-scale device applications. While the size of current origami constructs is large enough to connect bottom-up methods of patterning with top-down approaches, even larger scale structures can be anticipated which will enable manufacturing breakthroughs, particularly if coupled with indexed localization within arrays. In this presentation approaches to the immobilization of semiconductive materials such as CNTs and quantum dots (QDts) on origami constructs at ~100 nm spacing, with programmed orientation on both single origami and on multiple micron long linear origami arrays, are reported. Figure 1. <img src='https://acs-archive-assets2.s3.amazonaws.com/241nm/uploads/79452_diagram.jpg' alt='' /> Figure 1: AFM images of a) single rectangular origami (srDO); b) d) one dimensional rectangular origami (1DrDO) c) one dimensional cross-like origami (1DclDO); d) CNTs aligned at the edge of srDO; e) two CNTs aligned on 1DcDO and f) QDot labeled 1DrDO.Two different lengths of ssDNA wrapped SWCNT, short (~92 nm�24) and long (~92 nm�24) nanotubes were bound to the ssDNA rich edges of DO. Figure 1d demonstrates that the nanotubes prefer to localize at the ssDNA rich edges of DO. Furthermore, to localize long CNT's, multiple origami constructs were assembled into extended one-dimensional DO arrays. This array has been used to successfully align pairs of CNTs exceeding ~500 nm in length in a parallel orientation (Fig. 1e). To demonstrate the concept of using multiple micron long origami substrates to organize multiple QDts into arrays, we reacted QDts and ~5 micron 1DrDO. The AFM image in Fig. 1f shows part of a DO array used to localize multiple QDts with ~44�3 nm spacing and ~96�3 nm pitch. These results, readily bridging the nanometer to micron size domains, indicate a promising future path toward the development of opto-electronic and electrochemical sensors.

Nanometer scale localization of semiconductive materials using DNA nanostructures

248th National Meeting (2014)

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