Preparation method of fluorescent double-enhanced sisal fiber carbon quantum dots

Abstract

The invention discloses a preparation method of fluorescent double-enhanced sisal fiber carbon quantum dots. The method comprises the following steps of: dissolving transition metal ion salt in ultrapure water, and adjusting the pH value to 8-12 by using ammonia water; putting cleaned sisal fibers into a stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, and then adding the pH-adjusted transition metal ion salt solution into the reaction kettle; and performing hydrothermal reaction, cooling to room temperature, filtering, centrifuging, and diluting with PEG (Polyethylene Glycol) to obtain the fluorescent double-enhanced sisal fiber carbon quantum dots. According to the invention, biomass sisal fibers containing abundant groups are used as a carbon source, and a fluorescence double-enhancement effect on the carbon quantum dots can be realized only by introducing metal ions in a hydrothermal process and then carrying out passivation modification without the participation of a metal chelating agent. The fluorescence double-enhanced sisal fiber carbon quantum dots prepared by the invention are environment-friendly and non-toxic, and can be applied to the fields of cell imaging, biosensing, disease diagnosis and other environmental analysis, biomedicine and the like as a fluorescence probe.

Description

technical field [0001] The invention relates to a method for preparing fluorescent double-enhanced high-quality biomass carbon quantum dots by using sisal fiber as a carbon source and by means of transition metal ion doping and surface passivation modification, which belongs to the field of nanometer materials. Background technique [0002] Carbon quantum dots (Carbon Quantum Dots, referred to as CQDs) have become a promising candidate for applications such as analysis and detection, bioimaging, and drug delivery due to their excellent and stable fluorescence characteristics, good biocompatibility, and rich in various groups. important material. [0003] There have been many reports on the preparation of CQDs, however, most of the CQDs were found to be prepared from non-renewable raw materials, such as carbon nanotubes, graphene, graphene oxide and their derivatives. These precursors are not only expensive, but also take a long time to prepare, and some processes also invol...

AI Technical Summary

Problems solved by technology

In order to change the emission wavelength of carbon dots, the metal-doped fluorescent carbon quantum dots can be obtained by dissolving the metal chelating agent and the transition metal salt in an organic solvent to form a mixed solution for solvothermal reaction, but the preparation method needs to use Organic solvents and chelating agents are not environmentally friendly

Few existing techniques utilize metal doping and surface passivation at the same time to improve the fluorescence properties of biomass CQDs

Images