Characterization of a solid-state microelectrochemical diode employing a poly(vinyl alcohol)/phosphoric acid solid-state electrolyte: Rectification at junctions between WO sub 3 and polyaniline
- Massachusetts Institute of Technology, Cambridge (USA)
The functionalization of an array of eight, closely spaced ({approximately}1.2 {mu}m) Pt or Au microelectrodes each {approximately}50 {mu}m long, 2 {mu}m wide, and 0.1 {mu}m thick with redox-active WO{sub 3} and polyaniline and the electrochemical characterization of the WO{sub 3}/polyaniline junction are reported. Chips consisting of microfabricated WO{sub 3} covering three of the available eight microelectrodes have been analyzed by Auger electron spectroscopy. The remaining five microelectrodes are available for further derivatization with polyaniline or can function as counterelectrodes. By placing a counterelectrode and a Ag quasi-reference electrode directly on the microchip and by coating the assembly with a thin film of poly(vinyl alcohol)/H{sub 3}PO{sub 4} solid polymeric electrolyte, the electrochemical system becomes self-contained. The solid polymer electrolyte is a good room-temperature H{sup +} conductor only when exposed to a H{sub 2}O-containing atmosphere. Complex impedance studies show as much as a 10{sup 3} change in H{sup +} conductivity from H{sub 2}O-saturated to H{sub 2}O-free gaseous atmosphere above the polymer electrolyte. The changes in conductivity of WO{sub 3} upon reduction or polyaniline upon oxidation allow demonstration of solid-state microelectrochemical transistors with these materials. The combination of WO{sub 3} and polyaniline on the chip allows demonstration of a microelectrochemical diode.
- OSTI ID:
- 5402259
- Journal Information:
- Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 2:5; ISSN CMATE; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
AUGER ELECTRON SPECTROSCOPY
ELECTRODES
ELECTROLYTES
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
FABRICATION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MICROELECTRONICS
MICROSCOPY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHOSPHORIC ACID
POLYMERS
SCANNING ELECTRON MICROSCOPY
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SOLID ELECTROLYTES
SPECTROSCOPY