Nonvolatile Memory Device Based On Nanoparticle Functionalized Tobacco Mosaic Virus
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Nonvolatile Memory Device Based On Nanoparticle Functionalized Tobacco Mosaic Virus Chunglin Tsai1, Ricky J. Tseng2, Yang Yang2, and Cengiz S. Ozkan3 1 Electrical Engineering, University of California at Riverside, Riverside, CA, 92521 2 Material Science and Engineering, University of California at Los Angeles, Los Angeles, CA, 90095 3 Mechanical Engineering, University of California at Riverside, Riverside, CA, 92521
ABSTRACT Hybrid virus/inorganic nanoscrystals are considered as important building blocks towards new types of functionality for electronic devices. We use tobacco mosaic viruses to assemble platinum nanoparticles and conjugate with quantum dots. By forming a thin hybrid nanocomposite layer in the crossbar junction, we show electronic memory effect based on electrical bistable states with a large on/off ratio, and long retention time. Such hybrid bioinorganic nanostructures for the first time are promising for future bio-inspired nanoelectronics. INTRODUCTION Nanostructured biomaterials represent an ideal template for organizing nanocrystals, including protein shelled viruses modified by metallic [1] or semiconducting nanoparticles [2]. Recently important development has also been focused on the building block of hybrid virus nanocomposites for large scale three dimensional system [3]. Application of these ordered inorganic nanoparticles on biomolecules includes electronic devices with new functionality. Such functionality has been demonstrated with DNA bridging the nanoscale electrical circuits [4], and M13 virus assembled cobalt oxide nanowires for Li ion battery electrodes.[5] These examples direct a rapidly growth field for new functions through the incorporation of the hybrid biomolecular/inorganic systems. In this study, we show a new function of memory effect in the hybrid system of tobacco mosaic virus (TMV) conjugated with platinum nanoparticles [6] or quantum dots. The enrichment of the electrical conductivity in the nanocomposite modifies its property and makes it a suitable candidate for electronic applications. EXPERIMENT TMV is a positive-sense single-stranded RNA plant virus comprising 2130 identical coat proteins. The rigid virion is a 300 nm long tube with 18 nm outer and 4 nm inner diameters. The chemical and physical stability of TMV has been studied under different conditions, such as temperature, pH value, and so on, proving the robustness of TMV structure. Although TMV has several strains and mutants, wild-type TMV-U1 was chosen as the nanotemplate to facilitate the synthesis.
The conjugation of nanoparticles with TMV was carried out by using platinum ion solution for electroless deposition. The metal ions can bind with the specific functional groups on the protein surface of virus. The viruses were first suspended in deionized water to the concentration of ~1 mg/mL followed by the addition of 1mM potassium tetrachloroplatinate (K2PtCl4) with the volume ratio 65:1 (K2PtCl4:TMV). The mixture was kept at the room temperature for approximately three hours to have viru
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