The proposed sensor array consisted of 16 microcapacitor
units with a 4 x 4 square structure, which were patterned on polydimethylsiloxane (PDMS) substrate.
He used percolative theory and microcapacitor
modeling to explain these results.
Ates, "Electrochemical impedance spectroscopic study of electrocoated polythiophene and poly(2-methyl thiophene) on carbon fiber microelectrode for microcapacitor
," International Journal of Electrochemical Science, vol.
of Illinois' Chicago campus, Jordan Maclay, director of the new microfabrication applications laboratory, and Peter Hesketh co-administer a research team to study a sensor based on a microcapacitor.
The device in question operates by sensing a change in impedance due to conformational changes in immobilized protein on the microcapacitor's plates; any change here means a change in the charge distribution on the capacitor.
The spacing of the microcapacitor plates, each of which is coated with a number of thin, porous islands of metal film, can vary from hundreds to thousands of angstroms.
The increasing of the permittivity can be explained by the formation of microcapacitors in the composite system, and the more the additives are added, the more the microcapacitors are formed .
Usually, the more the additives are added, the more the microcapacitors are formed which increase the permittivity of the system.
Compared with previously reported works on carbon-based electrochemical microcapacitors, the capacitive performance in this study may be not more advantageous than them, whereas our hybrid electrode has superior rate capability with the electrode maintaining 60% retention of its initial specific capacitance measured at a high rate of 8 mA/[cm.sup.2].
This indicates acceptable cyclability of PCW/CMP microelectrodes compared to electrochemical microcapacitors reported by Cui et al., where 62.9% of the initial capacitance is retained after 2000 cycles .
It has been well reported that the increase in the permittivity value in composites above percolation threshold is related to the presence of "microcapacitors
" above the percolation threshold [37, 381.
Liu et al., "Integration of Mn[O.sub.2] thin film and carbon nanotubes to three-dimensional carbon microelectrodes for electrochemical microcapacitors
," Journal of Power Sources, vol.