2 results about "Photocathode" patented technology

The invention discloses a preparation method of a paper-based photocathode biosensor for detecting microRNA. A gold nano-particle layer is coated in a working area of a paper-based carbon working electrode; polyhedral cuprous oxide is electrodeposited and lots of silver sulfide quantum dots can be loaded, and a photoelectric sensitized structure is formed, so that the cathode photocurrent is increased substantially; and in the presence of the target microRNA, a double-strand-specific-nuclease-induced target cycle reaction and a cascaded stem-branch hybridization strand reaction are made to obtain a negatively charged dendritic DNA double-helix structure. After assembling of positively charged gold nanoparticles, a gold tree with the good glucose oxidase mimicking activity is formed, so that the glucose oxidation reaction is catalyzed, the dissolved oxygen of the electron acceptor is consumed, the cathode photocurrent signal is reduced, and sensitive detection of the microRNA is realized.

The present invention relates to a photomultiplier having a configuration for improving response time characteristics. The photomultiplier comprises at least a sealed container, a photocathode, and an electron multiplier section. The electron multiplier section has an upper unit and a lower unit. The upper unit includes a focusing electrode, a mesh electrode, and a first dynode. The lower unit includes the subsequent dynodes excluding the first dynode and a pair of insulating supporting members. The length in the longitudinal direction of the first dynode is made greater than the interval between the pair of insulating supporting members. By this configuration, the sizes of the effective regions of the assigned electron multiplier channels can be set arbitrarily without being restricted by the pair of insulating supporting members.