Article

TiO2-based light-driven XOR/INH logic gates

Instituto de Química, Universidade de São Paulo, Caixa Postal 26077, CEP 05513-970 São Paulo, SP, Brazil.
Angewandte Chemie International Edition (Impact Factor: 11.26). 05/2006; 45(19):3143-6. DOI: 10.1002/anie.200600076
Source: PubMed

ABSTRACT

Logical progression: Optoelectronic XOR and INH logic gates based on two light inputs and an electrical output were demonstrated using a nanocrystalline TiO2 dye-sensitized solar cell. The Grätzel-type cell was generated using a ruthenium complex as dye, with reverse injection of electrons at the semiconductor/dye interface (see picture).

Download full-text

Full-text

Available from: Anamaria Alexiou
  • [Show abstract] [Hide abstract]
    ABSTRACT: We report a new versatile electrochromic device based on nanocrystalline titanium dioxide films modified with triruthenium acetate clusters of the type [Ru3O(OOCCH3)6(py)2(BPEB)]PF6 (BPEB=1,4-bis[2(4-pyridyl)etenyl]benzene). As evaluated from cyclic voltammetry and spectroelectrochemistry, the most relevant electrochromic process in this system is associated with the first reduction of the [Ru3O] cluster core. Typical electrochromic response is observed within a millisecond time scale, covering a wide range optical window (up to 1100nm), and exhibiting excellent stability over a thousand cycles between 0.5 and −1.0V.
    No preview · Article · Oct 2006 · Electrochemistry Communications
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A new bioinspired nanomaterial has been obtained by chemisorption of folic acid onto nanocrystalline titanium dioxide. The organic chromophore is linked with the semiconductor surface via the glutamate chain and anchored with the carboxylate group. The geometry and electronic structure of the chromophore was studied in detail with DFT. Photoelectrochemical studies revealed photosensitization of the new material towards visible light. The photoelectrodes composed of the folic acid/titanium dioxide hybrid material generated photocurrent over a 300-600-nm window. Moreover, the direction of the photocurrent could be changed from anodic to cathodic and vice versa by application of the appropriate photoelectrode potential. Photoelectrochemical and spectroscopic studies allowed the elucidation of the mechanism of photocurrent switching. Photoelectrodes composed of folatemodified titanium dioxide may serve as a simple model of optoelectronic switches and may constitute the basis for molecular photoelectronic devices.
    Full-text · Article · May 2007 · Chemistry - An Asian Journal
  • [Show abstract] [Hide abstract]
    ABSTRACT: Introduction Information Processing Based on ElectronicsBiological Information ProcessingThe Chemical ComputerFundamental Concepts of Logic GatesMolecular Switches as Logic Gates Input/Output SignalsReconfiguration, Superposition, and IntegrationBasic Logic Gates YES and NOT GatesOR and NOR GatesAND and NAND GatesXOR and XNOR GatesINH GateCombinational Logic Circuits EnOR and EnNOR FunctionsOther FunctionsSignal Communication Between Molecular SwitchesHalf-Adder and Half-SubtractorFull-Adder and Full-SubtractorA Molecular 2-to-1 Digital MultiplexerSequential Logic Circuits Molecular MemoriesA Molecular Keypad LockNeural-Type Systems A Logic Device under Control of an Intrinsic Threshold MechanismA Perceptron-Type SchemeLogic Devices Based on BiomoleculesHeterogeneous SystemsApplications of Molecular LogicConclusions Information Processing Based on ElectronicsBiological Information ProcessingThe Chemical Computer Input/Output SignalsReconfiguration, Superposition, and Integration YES and NOT GatesOR and NOR GatesAND and NAND GatesXOR and XNOR GatesINH Gate EnOR and EnNOR FunctionsOther FunctionsSignal Communication Between Molecular SwitchesHalf-Adder and Half-SubtractorFull-Adder and Full-SubtractorA Molecular 2-to-1 Digital Multiplexer Molecular MemoriesA Molecular Keypad Lock A Logic Device under Control of an Intrinsic Threshold MechanismA Perceptron-Type Scheme
    No preview · Article · Feb 2008
Show more