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  • 2000-2004  (4)
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  • 1
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    AFM study of lattice matched and strained InGaAsN layers on GaAs (2001)
    Elsevier
    Details
    Publication Date: 2001-12-01
    Print ISSN: 0921-4526
    Electronic ISSN: 1873-2135
    Topics: Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Development of a Bio-nanobattery for Distributed Power Storage Systems (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Currently available power storage systems, such as those used to supply power to microelectronic devices, typically consist of a single centralized canister and a series of wires to supply electrical power to where it is needed in a circuit. As the size of electrical circuits and components become smaller, there exists a need for a distributed power system to reduce Joule heating, wiring, and to allow autonomous operation of the various functions performed by the circuit. Our research is being conducted to develop a bio-nanobattery using ferritins reconstituted with both an iron core (Fe-ferritin) and a cobalt core (Co-ferritin). Both Co-ferritin and Fe-ferritin were synthesized and characterized as candidates for the bio-nanobattery. The reducing capability was determined as well as the half-cell electrical potentials, indicating an electrical output of nearly 0.5 V for the battery cell. Ferritins having other metallic cores are also being investigated, in order to increase the overall electrical output. Two dimensional ferritin arrays were also produced on various substrates, demonstrating the necessary building blocks for the bio-nanobattery. The bio-nanobattery will play a key role in moving to a distributed power storage system for electronic applications.
    Keywords: Electronics and Electrical Engineering
    Type: SPIE 11th Anual International Symposium on Smart Structures and Materials; Mar 14, 2004 - Mar 18, 2004; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Electrochemical Reconstitution of Biomolecules for Applications as Electrocatalysts for the Bionanofuel Cell (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Platinum-cored ferritins were synthesized as electrocatalysts by electrochemical biomineralization of immobilized apoferritin with platinum. The platinum cored ferritin was fabricated by exposing the immobilized apoferritin to platinum ions at a reduction potential. On the platinum-cored ferritin, oxygen is reduced to water with four protons and four electrons generated from the anode. The ferritin acts as a nano-scale template, a biocompatible cage, and a separator between the nanoparticles. This results in a smaller catalyst loading of the electrodes for fuel cells or other electrochemical devices. In addition, the catalytic activity of the ferritin-stabilized platinum nanoparticles is enhanced by the large surface area and particle size phenomena. The work presented herein details the immobilization of ferritin with various surface modifications, the electrochemical biomineralization of ferritin with different inorganic cores, and the fabrication of self-assembled 2-D arrays with thiolated ferritin.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: LAR-16758-1 , LAR-16846-1 , SPIE 11th Annual International Symposium on Smart Structures and Materials; Mar 14, 2004 - Mar 18, 2004; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Biologically Derived Nanoparticle Arrays via a Site-Specific Reconstitution of Ferritin and their Electrochemistry (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Nanoparticle arrays biologically derived from an electrochemically-controlled site-specific biomineralization were fabricated on a gold substrate through the immobilization process of biomolecules. The work reported herein includes the immobilization of ferritin with various surface modifications, the electrochemical biomineralization of ferritins with different inorganic cores, the fabrication of self-assembled arrays with the immobilized ferritin, and the electrochemical characterization of various core materials. Protein immobilization on the substrate is achieved by anchoring ferritins with dithiobis-N-succinimidyl propionate (DTSP). A reconstitution process of electrochemical site-specific biomineralization with a protein cage loads ferritins with different core materials such as Pt, Co, Mn, and Ni. The ferritin acts as a nano-scale template, a biocompatible cage, and a separator between the nanoparticles. The nano-sized metalcored ferritins on a gold substrate displayed a good electrochemical activity for the electron transport and storage, which is suitable for bioelectronics applications such as biofuel cell, bionanobattery, biosensors, etc. Keywords: Ferritin, immobilization, site-specific reconstitution, biomineralization, and bioelectronics
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: 206th Meeting of The Electrochemical Society; Oct 03, 2004 - Oct 08, 2004; Honolulu, HI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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