Electronic properties of single Au nanocrystals and synthesis of 1-dimensional nanocrystal arrays |
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| Affiliation: | 1. Laboratory of Biosensing Technology, School of Life Sciences, Shanghai University, Shanghai 200444, PR China;2. State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, Nanjing University, Nanjing 210093, PR China;1. Department of Chemistry, Lehigh University, Bethlehem, PA 18015 USA;2. Department of Environmental and Occupational Health, Rutgers University School of Public Health, Piscataway, NJ 08854, USA;3. Department of Environmental Health Science, New York Medical College, Valhalla, NY 10595, USA;1. School of Mechanical & Vehicle Engineering, Linyi University, Linyi, Shandong, 276005, China;2. Electrochemical Materials and Interfaces, Dutch Institute for Fundamental Energy Research (DIFFER), 5612 AJ, Eindhoven, The Netherlands;3. School of Physics and Electronic Engineering, Linyi University, Linyi, Shandong, 276005, China;4. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, Shandong, 250061, China;1. School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, PR China;2. Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin, 300072, PR China;1. Novosibirsk State University, 630090 Novosibirsk, Russian Federation;2. V. V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russian Federation;3. B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 220072 Minsk, Belarus |
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| Abstract: | The current-voltage characteristics of citrate- and octanethiol-capped Au nanocrystals assembled on planar Au substrates under ambient conditions in air and in solution are reported. We have found that single electron tunneling (SET) behavior is observed for citrate-capped Au crystals in air. In high dielectric media, however, SET is only seen for nanocrystals protected by the hydrophobic alkane ligands and not for the relatively bare citrate-capped nanocrystals. In addition, we report a new strategy for assembling these nanocrystals into spatially well-organized 1-dimensional (1D) arrays. The method involves trapping the crystals inside 20 nm diameter pores of porous filtration membranes. The 1D linked nanocrystals confined inside the membrane pores were characterized by ultraviolet-visible spectroscopy. “Shrinkwrapping” the nanocrystals with the organic conductive polymer polypyrrole or covalently linking the particles with alkyldithiols and subsequent dissolution of the membrane provided a suspension suitable for characterization by transmission electron microscopy. These studies are important in determining the role of spatial arrangement and chemical environment on the electronic properties of this important class of crystalline material |
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