pH-sensitive Ni(OH)/sub 2/-based microelectrochemical transistors
Properties of arrays of closely spaced (1.2 ..mu..m) Au or Pt microelectrodes (approx.2 ..mu..m wide x 50 ..mu..m long x 0.1 ..mu..m high) coated with cathodically grown films of Ni(OH)/sub 2/ are reported. Electrical connection of microelectrodes by Ni(OH)/sub 2/ was verified by cyclic voltammetry. The ratio of anodic charge to cathodic charge in cyclic voltammograms for the Ni(OH)/sub 2/ in equilibrium NiO(OH) interconversion exceeds one. However, it is shown that excess charge in the anodic cyclic voltammetric wave for oxidation of Ni(OH)/sub 2/ does not affect the conductivity of Ni(OH)/sub 2/ films. The steady-state resistance of Ni(OH)/sub 2/ connecting two microelectrodes has been measured as a function of potential from 0 to 0.7 V vs. SCE and was typically found to vary from approx.10/sup 7/ to approx.10/sup 4/ ohms. The measured resistance corresponds to a resistivity of approximately 30 ohm cm in the oxidized state. The decrease in resistance is caused by electrochemical oxidation of insulating Ni(OH)/sub 2/ to conducting NiO(OH). At fixed drain voltage, V/sub D/, the gate current, I/sub G/, and the drain current, I/sub D/, can be measured simultaneously as the gate voltage, V/sub G/, is varied at a given frequency. The frequency response is limited by the slow electrochemistry of Ni(OH)/sub 2/ films. At a frequency of 3.8 x 10/sup -2/ Hz, Ni(OH)/sub 2/-based microelectrochemical transistors an amplify electrical power by a factor of 20.
- Research Organization:
- Massachusetts Institute of Technology, Cambridge
- OSTI ID:
- 6629669
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:7; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400400* -- Electrochemistry
CHEMISTRY
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMISTRY
ELEMENTS
EXPERIMENTAL DATA
GOLD
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
METALS
NICKEL COMPOUNDS
NICKEL HYDROXIDES
NUMERICAL DATA
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PH VALUE
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
SEMICONDUCTOR DEVICES
TESTING
TRANSISTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VOLTAMETRY