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      Asymmetric multi-segmented conjugated polymer-metal nanowires for engineering of non-linear electrical behavior

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          Abstract

          In this paper, we report on the impact of metal/polymer interfaces on the rectifying behavior of novel multi-segmented hybrid nanowires (HNWs) made of metallic and conjugated polymer (CP) segments. Using HNWs integrated in micromachined devices, the relationship between electronic properties and original structure is revealed. By combining transmission electron microscopy (TEM) and current-voltage (I-V) spectroscopy studies performed on several symmetric and asymmetric HNWs structures, we show that rectifying I-V characteristics are observed only for asymmetric HNWs. Moreover, it is shown that the rectification ratio can be improved up to 3 orders of magnitude by a proper selection of the HNW composition. While the rectifying behavior is observed in HNWs after oxidative or acid doping, the charge transport mechanism in as-synthesized HNWs is bulk-limited and independent from their structure. Both symmetric and asymmetric HNWs exhibit Ohmic and non-linear I-V curves above and below T~120 K, respectively. These electrical behaviors are consistent with a smooth transition from an Ohmic to a non-Ohmic variable-range-hopping (VRH) mechanism. We discuss the origin of these nonlinearities comparing the two- and four-probe measurements on single HNWs and we propose a simple model based on dual back-to-back Schottky diodes to explain qualitatively the rectifying properties.

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          Nanomaterials: a membrane-based synthetic approach.

          Materials with nanoscopic dimensions not only have potential technological applications in areas such as device technology and drug delivery but also are of fundamental interest in that the properties of a material can change in this regime of transition between the bulk and molecular scales. In this article, a relatively new method for preparing nanomaterials, membrane-based synthesis, is reviewed. This method entails synthesis of the desired material within the pores of a nanoporous membrane. Because the membranes used contain cylindrical pores of uniform diameter, monodisperse nanocylinders of the desired material, whose dimensions can be carefully controlled, are obtained. This "template" method has been used to prepare polymers, metals, semiconductors, and other materials on a nanoscopic scale.
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            Polymer and Organic Nonvolatile Memory Devices†

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              Nanowire-based sensors.

              Nanowires are important potential candidates for the realization of the next generation of sensors. They offer many advantages such as high surface-to-volume ratios, Debye lengths comparable to the target molecule, minimum power consumption, and they can be relatively easily incorporated into microelectronic devices. Accordingly, there has been an intensified search for novel nanowire materials and corresponding platforms for realizing single-molecule detection with superior sensing performance. In this work, progress made towards the use of nanowires for achieving better sensing performance is critically reviewed. In particular, various nanowires types (metallic, semiconducting, and insulating) and their employment either as a sensor material or as a template material are discussed. Major obstacles and future steps towards the ultimate nanosensors based on nanowires are addressed.
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                Author and article information

                Journal
                28 April 2013
                2013-06-28
                Article
                1304.7514

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Submitted for publication
                cond-mat.mes-hall

                Nanophysics

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