3 results about "Gold nanocrystal" patented technology

The application discloses an electrochemical aptamer sensor for high-sensitivity detection of alpha-amatoxin and a preparation method and application thereof, and belongs to the technical field of electrochemical detection. The working electrode of the sensor is a glassy carbon electrode, gold nanocrystals are used to modify the electrode first, then aptamers are connected to the gold nanocrystals through gold-sulfur bonds, and the remaining active sites are closed by using mercaptohexanol. The electrochemical aptamer sensor has high selectivity and sensitivity for alpha-amatoxin, and has the advantages of simple sample pretreatment steps, rapidness and convenience. The detection result of an actual human sample is satisfactory. The electrochemical aptamer sensor prepared by the application has been successfully applied to the detection of alpha-amatoxin in human urine, and has the advantages of extremely low detection limit, wide detection range, excellent selectivity and stability.

An acetone gas sensor based on PtRu alloy-modified hollow spherical ZnFe2O4, its preparation method, and its application are disclosed, belonging to the field of semiconductor oxide gas sensor technology. The sensor comprises an Al2O3 ceramic tube substrate with two parallel, ring-shaped, and discrete gold electrodes on its outer surface; a nano-sensitive material coated on the outer surface of the Al2O3 ceramic tube and the gold electrodes; and a nickel-chromium alloy heating coil placed inside the Al2O3 ceramic tube. The nano-sensitive material is a bimetallic PtRu alloy-modified hollow spherical ZnFe2O4. The ZnFe2O4 has a hollow microsphere structure, and its large specific surface area provides more reaction sites. The addition of PtRu alloy nanocrystals enhances the reaction due to sensitization and the synergistic effect of the two materials. Even with a relatively small bimetallic loading, better gas-sensing performance can be obtained, resulting in a gas-sensing element with good gas-sensing response, high selectivity, and fast response recovery speed for acetone.