Pilipenko A. Electrochemical formation of point-contact gas sensitive element

Object of research - processes of production gas sensitive point contacts, suitable to use under normal conditions. A research objective - development of electrochemical technology of formation and stabilization of point contacts for creation on their basis gas sensitive elements with use of a hypothesis about connection of the boosted reaction surf-ces of the sample to action donor and acceptor gases. Research methods: electrochemical synthesis of point contacts made in galvanic- and potentiostatic regimes; determination of parameters nanostructures carried out an alternating current on a procedure of a synchronous rectification on the basis of the circuit of a microcontact spectrometer; kinetic parameters of electrochemical processes determined by means of linear and cyclic voltamperometry; the nature of the channel of conductance nanostructure established on voltage-current characteristics of samples. Simulation anal-sis dendritic contact made on macroscopical model in the form of elongated element; distribution of an electronic current determined galvanometric and magnetic methods, and also measurement of a voltage drop on the calibrated resistor. Probings of immobilized processes solutions made according to conductometry. Gaseous sensitivity of the recei-ed samples defined on the laboratory bench with submission analyte the preset concentration. Theoretical and practical results are proved conditions of use of materials with structure which allows to realize a ballistic regime of course of a current in point-contact gas sensitive elements; the technology of the directional electrochemical formation dendritic point contacts on the basis of copper in solutions of sulfate of copper is developed. Novelty it is established, that process of formation dendritic point contacts at overlap on system of an electric field can take place in a cyclic mode due to realization in the short-circuit cell elongated element with the distributed potential; the directional synthesis dendritic nanostructures can be carried out, changing concentration of an electrolyte and a current intensity of electrolysis, that is caused by processes of prevailing creating nanostructures the certain geometrical sizes; it is revealed, that presence of delays of resistance on chronoresistograms at electrochemical dissolution of the channel of conductance dendritic nanostructure answers quantum shell-effect of ballistic point contacts; the model of an electrochemical cell with dendritic contact which is based on probing of distribution of an electric current and potential in metallic conductors in ionmedium environments is offered; It is shown, that dendritic contacts and positive stability of an electrolyte to evaporation it is possible to provide a stability augmentation introduction in structure of an electrolyte of gelatin; it is researched and installed, that course of oxidation-reduction reactions to surfaces of the channel of conductance copper dendritic contacts provides the response of samples to a pulse action of ammonia and vapor nitric acid.