CN-121537950-B - Photoacid double-response reversible fluorescence color-changing carbon dot material and preparation method thereof

CN121537950BCN 121537950 BCN121537950 BCN 121537950BCN-121537950-B

Abstract

The invention discloses a photoacid double-response type reversible fluorescence color-changing carbon dot material and a preparation method thereof, and relates to the technical field of luminescent carbon dot materials, wherein the preparation method comprises the steps of weighing a certain amount of sodium hydroxide, nickel chloride hexahydrate and rhodamine B, adding the sodium hydroxide, the nickel chloride hexahydrate and the rhodamine B into a beaker containing ethylene glycol, stirring, carrying out ultrasonic treatment for 30-min until the solution is completely dissolved, transferring the solution into a high-pressure reaction kettle, and reacting for 6-10 hours at 160-200 ℃; finally, the reaction product was filtered through a microporous filter and dialyzed 24h through a dialysis bag having a cutoff molecular weight of 300 Da to obtain the final product. According to the invention, through an innovative selective carbonization strategy, the intrinsic photochromic property independent of exogenous photochromic molecules is realized in a single carbon point material. Meanwhile, the preparation process adopts a one-step hydrothermal method, so that the process flow is simple, the cost is low, and the repeatability is excellent.

Inventors

XIE RUYAN
BIAN NAN
XIE XIN
FAN PAN
YOU YUAN
ZHANG SHUZHE
CHEN SHUO

Assignees

齐齐哈尔大学

Dates

Publication Date: 20260512
Application Date: 20260115

Claims (4)

1. The preparation method of the photoacid double-response reversible fluorescence color-changing carbon dot material is characterized by comprising the following steps: Step one, preparing 0.2-0.5 g of sodium hydroxide, 0.09-0.29 g of nickel chloride hexahydrate and 0.3-0.8 g of rhodamine B, adding the three materials into a beaker containing ethylene glycol, stirring, and performing ultrasonic treatment for 30min until the materials are completely dissolved; transferring the solution obtained in the step one into a high-pressure reaction kettle, and reacting for 6-10 hours at 160-200 ℃; And thirdly, filtering the reaction product obtained in the second step through a 0.22 mu m microporous filter, and dialyzing 24 h by using a dialysis bag with a cutoff molecular weight of 300 Da to finish the preparation.
2. The preparation method of the photoacid double-response type reversible fluorescence color-changing carbon dot material according to claim 1, wherein the selected amount of sodium hydroxide is 0.4g, the selected amount of nickel chloride hexahydrate is 0.19g, and the selected amount of rhodamine B is 0.5g; in the first step, the ethylene glycol in the beaker is 20mL; in the second step, the temperature is 180 ℃ and the reaction time is 8 hours.
3. The preparation method of the photoacid double-response type reversible fluorescence color-changing carbon dot material is characterized in that rhodamine B is used as a single precursor, and carbon nucleus formation is synchronously realized through a one-step hydrothermal method.
4. A photoacid double-response reversible fluorescence color-changing carbon dot material, which is characterized in that the carbon dot material is prepared by the preparation method according to any one of claims 1-3.

Description

Photoacid double-response reversible fluorescence color-changing carbon dot material and preparation method thereof Technical Field The invention relates to the technical field of luminescent carbon dot materials, in particular to a photoacid double-response reversible fluorescence color-changing carbon dot material and a preparation method thereof. Background Carbon dots are used as an emerging fluorescent nano material, and have wide application prospects in the fields of information encryption, biological imaging, intelligent sensing and the like due to excellent optical performance and biocompatibility. In recent years, development of intelligent carbon dot materials capable of achieving dynamic regulation of fluorescent color by external stimulus has become a research hotspot, wherein light stimulus is widely adopted due to advantages of non-contact, remote accurate control, rapid response and the like. Currently, the dominant technical route in this field relies on physical mixing or chemical modification of carbon sites with exogenous photochromic molecules (e.g., diarylethenes, spiropyrans, etc.) to achieve apparent light-responsive fluorescence changes. For example, the prior study combines blue fluorescent carbon dots with yellow fluorescent nanofibers through a supermolecule assembly strategy, realizes fluorescent color switching by utilizing photoisomerization of diarylethene, and reports that the blue fluorescent carbon dots are modified by spiropyran, and the ring opening/ring closing reaction is triggered by light or pH, so as to regulate the luminescence behavior. Notably, in the field of small organic molecules, rhodamine derivatives have been developed for use in stimulus-responsive materials, such as chinese patent CN117050091B discloses a rhodamine mechanochromatic material containing a hydantoin structure that exhibits photochromic properties under specific conditions and achieves color reversible changes by mechanical force or solvents. However, the prior art has obvious limitations that firstly, the interaction between carbon points and exogenous molecules is difficult to control accurately, so that the batch difference of material performance is large and the reproducibility is poor, secondly, the compatibility problem of the multi-component composite system affects the long-term stability of the material, and in addition, the variety of available exogenous photochromic molecules is limited, so that the regulation range of the luminescent color is restricted. The root of these problems is that the prior art cannot achieve both stable carbon core construction and precise molecular switch unit retention during carbon dot formation. Therefore, the development of carbon dot materials which do not depend on exogenous modification and have intrinsic light response fluorescence color change characteristics has become a key for breaking through the bottleneck of the prior art and pushing the field to develop forward. Based on the above technical problems, a person skilled in the art needs to develop a photoacid double-response reversible fluorescence color-changing carbon dot material and a preparation method thereof, which can overcome the defects that the existing fluorescence carbon dot depends on exogenous photochromic molecules, the preparation process is complex and the performance is unstable, and the process flow is simple. Disclosure of Invention The invention aims to provide a photoacid double-response reversible fluorescence color-changing carbon dot material and a preparation method thereof, and aims to overcome the defects that the existing fluorescence carbon dot depends on exogenous photochromic molecules, the preparation process is complex and the performance is unstable, realize that the carbon dot generates high-contrast reversible fluorescence color conversion under the light stimulation, and meet the requirements of the fields of high-end information encryption and the like on the stability and the functional integration level of the material. In order to achieve the above object, the present invention provides the following technical solutions: The invention relates to a preparation method of a photoacid double-response reversible fluorescence color-changing carbon dot material, which comprises the following steps: Step one, preparing 0.2-0.5 g of alkaline material, 0.09-0.29 g of inorganic salt compound and 0.3-0.8 g of fluorescent dye, adding the three materials into a beaker containing ethylene glycol, stirring, and performing ultrasonic treatment for 30min until the three materials are completely dissolved; transferring the solution obtained in the first step into a high-pressure reaction kettle, and reacting at 180 ℃ to obtain 8 h; And thirdly, filtering the reaction product obtained in the second step through a 0.22 mu m microporous filter, and dialyzing the reaction product by a dialysis bag with a cutoff molecular weight of 300 Da for 24 h to finish the preparati