molecular_electronics_nano_051605

molecular_electronics_nano_051605 - Outline: 1. Background...

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1 nanochemistry 5/16/05 Outline: 1. Background 2. conductivity in molecules 3. carbon based molecular junctions 4. conductivity in phenylenes 5. molecular switching
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A Driving Force Behind Nanotechnology M i n m u F e a t r S z ( ) Year 1980 1990 2000 2010 µ 10.0 1.0 0.1 Lithography molecules 2 nanochemistry 5/16/05 IBM webpage: http://www.research.ibm.com/0.1um/
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Some history: Long range electron transfer in “D-B-A” systems e - DA D = electron donor A = electron acceptor B= bridge (e.g. DNA, peptides, etc) e.g. “Long Range Photoinduced Electron Transfer through a DNA Helix," C. J. Murphy, … J. K. Barton, Science, 262, 1025 (1993). Electron transfer through 40 Å of DNA helix 3 nanochemistry 5/16/05
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Long range electron transfer in electrochemistry: e - A 4 nanochemistry 5/16/05 A - conductor (Au, carbon, Ag, etc) Sikes, et al., Science 291 1519 ( Feb 23, 2001) δ (ln i) electron acceptor in solution How does electron transfer rate depend on: •d istance? • bridge structure? • acceptor? • density of states in conductor? δ d for phenylenevinylidene = -0.06 Å -1 S
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“Molecular Junction:” M 2 M 1 e - conductor (Au, carbon, Ag, etc) How does conductance depend on: • junction thickness? • bridge structure? • density of states in conductors? • nature of conductor/molecule contact? 5 nanochemistry 5/16/05
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“Organic” electronics (generally > 20 nm film thickness) Organic FET/LED combination: (Dodabalapur, Rogers, APL 73 ,142 (1998)) FET LED • organic thin film transistors (pentacene, etc) • organic light emitting diodes (OLEDs) • polymer LEDs based on conducting polymers 6 nanochemistry 5/16/05
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Single Molecule electronics, with scanning tunneling microscopy: Andres. ..Kubiak, Science 272 , 1323, (1996) R for single molecule of xylyl dithiol = 18 M “Coulomb staircase” for xylyl dithiol 7 nanochemistry 5/16/05
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Atomic Force Microscopy (AFM) 8 nanochemistry 5/16/05 Cantilever Tip
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9 nanochemistry 5/16/05 β = 1.45 per CH 2 unit metal S S S S S S Distance dependence: CP-AFM V
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Distance dependence: 10 nanochemistry 5/16/05 β = 0.41 Å -1 Wold, Frisbie, JPC B 2002, 106, 2813
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11 nanochemistry 5/16/05 Science, Nov 9, 2001
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Promise: • Molecules have tunable orbitals and “band gaps”, also quantum effects • Wide range of structure and function (>10 7 known molecules to choose from) • Simple processing, potentially very low cost • Molecular devices could be 1-10 nm in size, leading to increase of data density by 10 6 • Chemical or biological sensitivity of molecular devices • Possible “technology displacement” on a scale comparable to the transition from vacuum tubes to silicon 12 nanochemistry 5/16/05
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Hype: “Our goal is to make chips so cheaply and easily that any 12-year-old with a chemistry set could do it,“ (S.F. Chronicle) “Processors 100 billion times faster than the most powerful ones available today.” (ABC News) • “Picture trillions of transistors , processors so fast their speed is measured in terahertz , infinite capacity , zero cost .
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This note was uploaded on 07/17/2008 for the course CHEM 694 taught by Professor Dr.coe during the Spring '05 term at Ohio State.

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molecular_electronics_nano_051605 - Outline: 1. Background...

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