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Issue 4, 2011
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Controlling the length and location of in situ formed nanowires by means of microfluidic tools

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Abstract

Progress in microelectronics, sensors and optics is strongly dependent on the miniaturization of components, and the integration of nanoscale structures into applicable systems. In this regard, conventional top-down technologies such as lithography have limits concerning the dimensions and the choice of material. Therefore, several bottom-up approaches have been investigated to satisfy the need for structures with large aspect ratios in the nanometre regime. For further implementation, however, it is crucial to find methods to define position, orientation and length of the nanowires. In this study, we present a microchip to trap in situ formed bundles of nanowires in microsized cages and clamps, thereby enabling immobilisation, positioning and cutting-out of desired lengths. The microchip consists of two layers, one of which enables the formation of metal–organic nanowires at the interface of two co-flowing laminar streams. The other layer, separated by a thin and deflectable PDMS membrane, serves as the pneumatic control layer to impress microsized features (“donuts”) onto the nanowires. In this way, a piece of the nanowire bundle with a prescribed length is immobilised inside the donut. Furthermore, partly open ring-shaped structures enabled trapping of hybrid wires and subsequent functionalisation with fluorescent beads. We believe that the method is a versatile approach to form and modify nanoscale structures via microscale tools, thereby enabling the construction of fully functional nanowire-based systems.

Graphical abstract: Controlling the length and location of in situ formed nanowires by means of microfluidic tools

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Publication details

The article was received on 03 Aug 2010, accepted on 29 Oct 2010 and first published on 07 Dec 2010


Article type: Technical Note
DOI: 10.1039/C0LC00270D
Citation: Lab Chip, 2011,11, 753-757
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    Controlling the length and location of in situ formed nanowires by means of microfluidic tools

    P. Kuhn, J. Puigmartí-Luis, I. Imaz, D. Maspoch and P. S. Dittrich, Lab Chip, 2011, 11, 753
    DOI: 10.1039/C0LC00270D

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