ASU EEE 598r - Electrochemistry in Nanoelectronics & Nanosensors (60 pages)

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Electrochemistry in Nanoelectronics & Nanosensors



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Electrochemistry in Nanoelectronics & Nanosensors

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Pages:
60
School:
Arizona State University
Course:
Eee 598r - Special Topic Courses

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Electrochemistry in Nanoelectronics Nanosensors N J Tao Arizona State University Conductance Quantization Classical conductance L electron mean free path D F electron wavelength D L Conductance 1 G D2 R G changes continuously as D G G0 L R 2 D 2 D Conductance Quantization Free Motion Quantized ballistic transport no collisions wave nature of electron important Quantized L electron mean free path D F electron wavelength Free Motion N 1 N 2 D F 2 D F G G0 Tn NG0 n 1 where N 0 1 2 3 and G0 2e2 h 77 S R0 13 k G G0 N 5 4 3 F 1 3 2 1 D Quantum Confinement Standing Waves Conductance Quantization Metal Nanowires F 1 3 must be atomically thin l e nm Room temperature How to fabricate such wires Electrochemical Fabrication Bipotentiostat RE CE Li Tao Appl Phys Lett Electrolyte Metal wire insulation substrate Substrate Etching tip Deposition Etching Deposition 10 Deposition Conductance 2e2 h Conductance 2e2 h Etching dissolution 10 8 6 4 2 0 1000 2000 3000 4000 5000 6000 T im e m s 8 6 4 2 0 20 40 60 80 100 120 140 160 T im e m s From Conductance Quantization to Quantum Tunneling Etching or Deposition Li Tao Nanotechnology 10 221 1999 Morpurgo et al Appl Phys Lett 13 2082 1999 Large gap From Conductance Quantization to Quantum Tunneling Etching Deposition Tunneling 4 5 3 5 5 2 6 5 1 7 5 0 8 5 1 9 5 2 T im e s e c d iv is io n ln I nA Gap Width A Large gap Tunneling current Ln I width Stepwise Tunneling Current Log scale a 3 5 5 2 6 5 1 7 5 0 8 5 5 5 10ms b 1 2 6 5 1 7 5 0 8 5 1 9 5 2 I exp bL ln I L Stepwise ln I leads to discrete change of s ln I nA Gap Width A 4 5 s Discrete Nature of Atom Charge Transport in Single Molecules Electrochemical Molecular FET Gate K Drain Source Gate Source Drain Electrochemical Gate CE RE Gate O WE1 Source HS N O Fe N SH WE2 Drain Redox molecule LUMO EF Vg G G0 2e2 h EF EF LUMO HOMO HOMO EF p type Ferrocenes O HS N O Fe N SH Cysteamine Fc cysteamine Fc 1 Xu et al JACS 2005 Ferrocenes Gate Effect Reversible gate effect with hysteresis Current



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