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Start Over Topic molecular electronics
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1. Self-assembly on silicon carbide nanomesh templates.

Author

Wei Chen, Andrew Thye, and Shen Wee

Subjects
*PAPER, *MOLECULAR electronics, *BIOSENSORS, *NANOSTRUCTURES, *ABSORPTION
Abstract

Well-ordered two-dimensional functional nanostructure arrays have a broad range of potential applications in molecular electronics, ultra-high density data storage, biosensors, single-electron, single-photon and quantum computation devices. Various surface nanotemplates that are naturally or artificially patterned at the nanometre scale have been used to guide the formation of highly periodic nanostructure arrays. In this paper, we review recent progress in the development of various surface nanotemplates as well as the self-assembly of nanostructures on them, with particular emphasis on the unique SiC nanomesh template. The formation mechanism of this nanomesh template is attributed to the self-assembly of accumulated carbon atoms into well-ordered honeycomb superstructures at the nanometre scale on the 6H-SiC(0 0 0 1) surface. The size and spacing of unit cells of the SiC nanomesh can be tailored in the 2-2.5 nm range by adjusting the annealing time. This nanomesh is demonstrated to be an effective template for the formation of well-ordered molecular arrays of copper(II) phthalocyanine (CuPc). The growth of C60 on the nanomesh follows a typical Stranski-Krastanov mode, and a complete C60 wetting monolayer can be epitaxially grown on this nanotemplate. It is effective in isolating metal nanoclusters, resulting in the formation of monodispersed Co nanoclusters with a narrow size distribution. The adsorption and desorption of Co nanoclusters and C60 do not change its atomic structure, making it a chemically and thermally stable nanotemplate for the formation of well-ordered nanostructures arrays as well as monodispersed metal nanoclusters. [ABSTRACT FROM AUTHOR]

Published
2007
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2. Organic Electronics on Banknotes

Author

Masaaki Ikeda, Hirokazu Kuwabara, Ute Zschieschang, Hagen Klauk, Tatsuya Yamamoto, Tsuyoshi Sekitani, Kazuo Takimiya, and Takao Someya

Subjects
Paper, Organic electronics, Materials science, Yield (engineering), Transistors, Electronic, business.industry, Mechanical Engineering, Forensic Sciences, Transistor, Electric Conductivity, Molecular electronics, Thiophenes, Flexible electronics, law.invention, Mechanics of Materials, law, Printed electronics, Optoelectronics, General Materials Science, Organic Chemicals, Thin film, business, Electronic circuit
Abstract

Organic transistors and circuits are fabricated directly on the surface of banknotes. The transistors operate with voltages of 3 V and have a field-effect mobility of about 0.2 cm2 V−1s−1. For an array of 100 transistors a yield of 92% is obtained.

Published
2010

3. Interaction of a spirooxazine dye with latex and its photochromic efficiency on cellulosic paper

Author

Bo Sun, Zehua Liu, Qingxi Hou, Yonghao Ni, Ruitao Cha, and Zhibin He

Subjects
Paper, Materials science, Polymers and Plastics, Latex, Organic Chemistry, Molecular electronics, Substrate (chemistry), Color, Dispersant, Photochromism, chemistry.chemical_compound, chemistry, Chemical engineering, Microscopy, Electron, Transmission, Transmission electron microscopy, Polymer chemistry, Emulsion, Oxazines, Materials Chemistry, Microscopy, Electron, Scanning, Polystyrene, Cellulose, Coloring Agents
Abstract

Spirooxazine (SO) is a class of important photochromic dyes for many applications, such as anti-counterfeiting printing, reversible memory photo devices and optical switching elements in molecular electronics. Since these dyes are expensive, improving their coloration efficiency in response to photo stimuli is of practical importance. In this study, a spirooxazine dye, 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-[3H]naphtha[2,1-b][1,4]oxazine], was dispersed into the substrate of a polystyrene acrylic latex emulsion to obtain a stable photochromic dye loaded latex. The photochromic latex was then applied on cellulose paper, and its coloration efficiency was significantly higher than the control (without the latex). Transmission electron microscope (TEM) observation revealed that the spirooxazine dye was well dispersed into the matrix of the latex particles, which functioned as a carrier/dispersant for the photochromic dye. Other results, including color stability, and fatigue resistance, were also discussed.

Published
2013