Electrochemical in-situ film conductivity measurer

Abstract

The invention relates to an instrument for measuring the conductivity of home position electrochemistry membrane, which comprises a host machine unit S, a slave machine unit X, a current measuring unit L and a conductance measuring unit D. The host machine unit X is a computer for storing and running the inventive software program; the slave machine unit X controls the current measuring unit L and conductance measuring unit D.

Description

technical field [0001] The invention belongs to a conductivity measuring instrument, in particular to an electrochemical in-situ film conductivity measuring instrument. Background technique [0002] Electrochemical method, as a simple, rapid, accurate, and high-sensitivity analysis, detection and characterization method, has always occupied a more important position in scientific research and production. The realization of electrochemical methods From the early polarograph to the potentiostat, and the time and different waveform measurement technology combined with computer sampling and control technology in recent years, electrochemical technology and methods have made great progress and development. , which provides a very convenient condition for us to study the transfer process of interface electrons. The electron transfer on the interface, especially the redox of modified species on the electrode surface, is usually accompanied by changes in other properties of these s...

AI Technical Summary

Problems solved by technology

In the early film conductivity measurement, the four-point probe technique was widely used (developed from the early two-point probe technique based on Ohm's law measurement), and this method can only be used for off-site film conductivity characterization, it does not provide information on instantaneous conductivity changes

In recent years, some research groups have used self-made simple methods to directly connect the four-probe or two-probe technology with electrochemical instruments, trying to study the information on the change of membrane conductivity in situ when the electrochemical potential is applied. The research group of Professor Wrighton of MIT This work was first carried out in the early 1980s. In this measurement, in order to improve the signal strength and signal-to-noise ratio, they used a wire grid electrode similar to a microelectronic circuit device; subsequently, Zotti and Kankare et al. The research team simplified such a probe and developed a micro-double-band electrode; in addition, in the mid-1990s, Professor Heinz in Germany also used a micro-array electrode similar to that of Wrighton et al. In the measurement of the conductivity of organic semiconductor films, combined with the instrument developed by myself, good measurement results have been obtained; in previous work, the instrument was mainly a commercially available basic electrochemical instrument, supplemented by an additional DC measurement Resistor modules, poor instrument integration, low output, 12-15 volts, not suitable for research systems with high film resistance, such as inorganic semiconductor films, etc., and the conductivity measurement range is small, the data communication rate is low, the software Low degree of automation and poor interface friendliness

At the same time, the electrodes are mostly disposable and expensive, which is not conducive to commercialization; the simplified micro-double-band electrode uses an organic insulating film-Teflon or Mylar film, the film is relatively soft, and the micro-double-band insulation gap is small , during mechanical polishing, it is very easy to cause short circuit of the electrode, and the solvent resistance of the polyester film also limits its application range, thus affecting the electrochemical determination

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