6results about How to "Long fluorescence lifetime" patented technology

The invention provides a bilateral SiO2-coated CsPbX3 quantum dot, a method and application, and relates to the field of nanomaterials and biosensing, Cs4PbX6 nanoparticles are added into an organic phase to obtain an organic phase dispersion liquid of the Cs4PbX6 nanoparticles; adding a silicon source into the dispersion liquid; adding an aqueous solution containing halide ions into the system, and then vigorously oscillating to initiate crystal phase transformation of Cs4PbX6 to CsPbX3 and react with the silicon source, so as to form CsPbX3 quantum dots coated with bilateral SiO2 in situ; and after standing, carrying out centrifugal separation to obtain a CsPbX3 quantum dot solution coated with bilateral SiO2. The obtained quantum dot has excellent water stability and efficient fast anion exchange (FAE) activity, the fluorescence lifetime of the quantum dot is as long as 46.44 ns, and the fluorescence intensity is only attenuated by 21.8% after the quantum dot is violently reacted with water for 60 minutes.

This invention provides a siloxane ligand-protected Ag 40 Nanoclusters, their synthesis methods, and applications. This invention relates to Ag protected by siloxane ligands. 40 Nanoclusters are composed of RC≡C ‑ and (Ph 4 Si 4 O 8 ) 4‑ Ag protected by both ligands 40 Nanoclusters, with the molecular formula {Ag} 40 [(RC≡C) 8 (Ph 4 Si 4 O 8 ) 6 The silver nanoclusters synthesized in this invention have precise atoms and novel structures; the synthesis method is simple, easy to operate, mild under mild conditions, and the raw materials are readily available, making it potential for industrial and commercial production; the obtained silver nanoclusters exhibit superior fluorescence performance at low temperatures and have a long fluorescence lifetime, making them practically valuable in the field of fluorescent probes and worthy of market promotion.

The application discloses a TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst and a preparation method and application thereof, and relates to the field of photocatalytic materials. The TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst comprises a TiO2 inner core, and a ZnIn2S4 outer shell coated outside the TiO2 inner core; the ZnIn2S4 outer shell is formed by in-situ growth of ZnIn2S4 nanosheets on the surface of the TiO2 inner core to form a three-dimensional hierarchical nanoflower structure; wherein, an S-type heterojunction is formed between the TiO2 and the ZnIn2S4. The photocatalyst realizes efficient spatial separation of photo-generated carriers through a close heterojunction interface of the core-shell structure, and meanwhile, the S-type heterojunction retains the carriers with strong oxidation-reduction capacity, so that the performance of water decomposition for hydrogen production by photocatalysis and the cycle stability are improved.

The invention relates to rare earth doped down-conversion nanoparticles, a preparation method thereof and application of the rare earth doped down-conversion nanoparticles in detection of quinolone antibiotics, and belongs to the technical field of chemical materials and food detection. The rare earth doped down-conversion nano-particle comprises an inner core, a shell and a coating layer, wherein the shell is positioned between the inner core and the coating layer; the inner core contains NaGdF4: Ce / Eu / Ca, the shell contains NaTbF4, and the coating layer contains SiO2; the NaGdF4: Ce / Eu / Ca is a material which takes NaGdF4 as a matrix and is doped with Ce, Eu and Ca. According to the invention, the hydrophilicity and dispersity of the nanoparticles are improved, and the enrichment and detection limits of norfloxacin are improved. The fluorescent probe has the characteristics of narrow-band emission, long fluorescence lifetime, excellent light and chemical stability, low biotoxicity and the like, and the detection method is simple and convenient.

The invention provides an application of Mn-RuO2 in preparation of a medicine for treating cancer, wherein the cancer is pancreatic cancer. A photoelectrochemical test system proves that Mn-RuO2 has the performance expressions of remarkable fluorescence quenching, longest fluorescence lifetime, relatively low charge transfer resistance and strong photocurrent response, and shows that Mn-RuO2 has excellent carrier separation efficiency and low recombination efficiency. Under ultrasonic irradiation, Mn-RuO2 can effectively improve the hypoxic environment and enhance ROS generation, meanwhile, programmed para-apoptosis and pan-apoptosis signal channels in tumor cells are activated, and the synergistically enhanced anti-tumor effect is shown.