Carbon fiber electrode used for diphenol microsensor
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A carbon fiber electrode and micro sensor technology, applied in the field of electrochemistry, can solve the problems of small RC time constant of electrochemical cell, reduction of electric double layer capacitance, etc.
Inactive Publication Date: 2015-09-16
TIANJIN POLYTECHNIC UNIV
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[0008] (2) Due to the small surface area, the electric double layer capacitance of the microel
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Embodiment 1
[0020] Assembly of carbon fiber electrodes
[0021] (1) Sonicate a carbon fiber with a diameter of about 6 μm in acetone and distilled water for 2 to 3 minutes, select a carbon fiber to bond the carbon fiber and copper wire with silver conductive glue, and dry at room temperature;
[0022] (2) Cut the capillary to a length of 5-6 cm, burn both ends of the capillary with an alcohol lamp to make the opening shrink smaller, and use it for packaging;
[0023] (3) Encapsulate the bonded carbon fiber in the capillary with epoxy resin, fully dry it at room temperature, and then cut the length of the exposed carbon fiber to 0.8-1mm.
Embodiment 2
[0025] carbon fiber modification
[0026] (1) Immerse the assembled carbon fiber electrode in dilute H 2 SO 4 , the potential is set to 0V ~ 1.7V, and the cyclic voltammetry scan is performed until a stable cyclic voltammetry image appears;
[0027] (2) Immerse the assembled electrode into an acetonitrile solution containing a certain concentration of lithium perchlorate and EDOT monomer, and pass high-purity nitrogen gas for several minutes to eliminate the interference of oxygen. The constant potential polymerization is adopted, the polymerization potential is set at 1.2-1.4V, and the polymerization time is set at 10-15s.
Embodiment 3
[0029] Detection of hydroquinone and catechol
[0030] (1) Add a certain concentration of hydroquinone and pyrocatechol into the PBS buffer solution with a pH of 7, carry out cyclic voltammetry scanning at a potential of -0.2V to 0.6V, and a scan rate of 0.1V / s. Oxidation potentials of hydroquinone and catechol were observed;
[0031] (2) Using the standard addition method, hydroquinone and catechol were added to the constantly stirring PBS solution at their respective oxidation potentials, and the respective detection ranges and detection limits were calculated on the obtained current-time curves.
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Abstract
The invention relates to modification for an electrode of a sensor, in particular to the assembly of a carbon fiber electrode and modification for the surface of the carbon fiber electrode so that the sensitivity and the signal intensity of the carbon fiber electrode for a to-be-detected article are enhanced. A specific preparation process comprises the following steps: (1) performing ultrasonic treatment on carbon fibers for 2-3min by using acetone and distilled water, drying, connecting copper wires and carbon fibers together by using silver conductive glue; (2) encapsulating the copper wires into a capillary tube by adopting epoxy resin without electrochemical catalytic activity, and completely drying under room temperature; (3) cutting the carbon fibers at the top end of the capillary tube so that the carbon fibers have suitable lengths, and dipping the electrode into dilute H2SO4 for electrochemical activation; (4) dipping the electrode subjected to electrochemical activation into acetonitrile solution containing 3,4-ethylenedioxythiophene (EDOT) and lithium perchlorate for potentiostatic electropolymerization; and (5) testing the performances of the prepared electrode by adopting an electrochemical workstation. The preparation process is easy to operate, the cost of the electrode is greatly reduced, and the prepared electrode has extremely high catalytic oxidation capacity for diphenol substance and has a very high practical value in the field of microelectrodes.
Description
technical field [0001] The invention relates to a carbon fiber electrode with electrocatalytic activity of hydroquinone and catechol, which belongs to the field of electrochemistry. Background technique [0002] Over the past few decades, established methods for the detection of substrates, including fluorescence, chemiluminescence, spectrophotometry, solid-phase extraction techniques, pulsed radiation, and high-performance liquid chromatography, have many deficiencies. These testing methods are time-consuming, costly, low-sensitivity and complicated pre-treatment process. In recent years, the research direction has shifted to more efficient electrochemical techniques to reduce the detection limit and obtain reliable results at low cost. [0003] Since the sensor can replace conventional chemical analysis methods, its appearance can be said to be a technological revolution. For this reason, some countries with advanced technology in the world regard the research of sensors...
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