51results about How to "Increase response current" patented technology

The invention discloses an electrochemical biosensor for detecting bisphenol-A, and a preparation method and an application thereof. The electrochemical biosensor comprises a counter electrode, a reference electrode and a working electrode. The electrochemical biosensor is characterized in that the working electrode is a glassy carbon electrode surface-modified by a graphene / gold complex, tyrosinase and chitosan. The preparation method comprises a step of preparing the graphene oxide; a step of preparing the graphene / gold complex; and a step of polishing and cleaning a bare glassy carbon electrode. A three electrode system electrochemical enzyme sensor is formed in the way that the graphene / gold complex, the tyrosinase and the chitosan are modified on the glassy carbon electrode to be used as the working electrode, a platinum electrode is used as the counter electrode and a saturated calomel electrode is used as the reference electrode. The concentration of bisphenol-A in a to-be-detected sample is determined by immersing the electrochemical biosensor in the to-be-detected sample and according to a quantitative relationship between corresponding current value and the concentration of bisphenol-A. The electrochemical biosensor has high sensitivity, strong selectivity, high accuracy and fast detection speed. The preparation method is simple and practical, and convenient for operations in actual detection.

The invention belongs to the technical field of sensors, in particular to a microelectrode array chip sensor for electrochemical immunological detection. The invention uses silicon-based material to carry out manufacturing; and a chip integrates an electrochemical detected working electrode, an auxiliary electrode and a reference electrode, which has a good signal to noise ratio. The auxiliary electrode and the working electrode form a ring-disk structure, and the distance between the auxiliary electrode and the working electrode is small, thereby improving the sensitivity of the electrodes. The array distribution of a plurality of working electrodes can be used for multi-channel detection. The invention can be widely used for detection in various fields such as biological medicine and the like. The sensor is manufactured by using MEMS process, and has simple process and low cost.

The present invention discloses resistance switch effect based non-volatilisation phase transition memory element physical design preparation method. It contains setting solid electrolyte RbAg 4I5 film between reaction electrode and non - reaction electrode to construct one miniature sandwich structure of memory unit, said memory unit together with substrate and insulating layer all having five layers, depositing single-layer non - reaction electrode on substrate, depositing single-layer insulating layer on non - reaction electrode, and etching one micro pore in it to expose non - reaction electrode, depositing single-layer RbAg 4I5 film on insulating layer, thereon depositing single-layer reaction electrode, respectively leading out leading wire on non - reaction electrode and reaction electrode. Said memory element has advantages of compactness, simple structure, non-volatilisation, rapid read-write, low operating voltage and energy consumption, non - moving part, and nondestructive readout etc.

Using immersion method, magnetron sputtering method or electroplating method prepares catalyst in use for Nano carbon tubes to be developed attached to surface or shallow layer on surface of solid electrode. Then, carbon source are developed to Nano carbon tubes in situ of electrode catalyst attached to. Advantages are: good electrochemistry performance and detection performance of electrode chemical modified by Nano carbon tubes.