Environmental-friendly synthesis method of fluorescent carbon dot with up-down conversion function

Abstract

The invention belongs to the field of preparation of fluorescent carbon dots, and discloses a synthesis method of the fluorescent carbon dot with an up-down conversion function. The method comprises the following steps of: adding chilli flakes into water and evenly mixing, thereby obtaining a mixture; transferring the mixture into a hydrothermal kettle, performing a hydrothermal treatment at 120 to 200 DEG C for 2 to 10 hours, and cooling and filtering, thereby obtaining a brown liquid; centrifuging the brown liquid for 10 to 20 minutes, thereby obtaining a supernatant; dialyzing the supernatant by using a dialysis bag with the flow interception volume of 3500; and collecting a dialysate after dialyzing for 10 to 30 hours, thereby obtaining the fluorescent carbon dot. By taking a cheap raw material as a carbon source and the water as a solvent, the method for synthesizing the fluorescent carbon dot with the up-down conversion function in an environmental-friendly manner has the effects that the process is simple; the pretreatment operation is not required; the process that the synthesis is assisted by a strong acid or a surface passivator is not required; the raw material is cheap and easy to obtain; the synthesis condition is moderate and controllable; the high fluorescence quantum yield is achieved; and the carbon dot is good in fluorescent bleaching resistance and stability.

Description

technical field [0001] The invention belongs to the field of preparation of fluorescent carbon dots, in particular to a green synthesis method of carbon dots. Background technique [0002] As a new fluorescent nanomaterial, fluorescent carbon dots have been studied due to their good water solubility, inherent chemical inertness, simple chemical modification, high resistance to photobleaching, low toxicity and good biocompatibility. attention. In recent years, many methods, such as electrochemical oxidation, hydrothermal, acid pyrolysis, template preparation, microwave, ultrasonic, arc discharge, and laser etching, have been used to synthesize fluorescent carbon dots. The expensive synthetic equipment and materials, complex operation and non-environmental protection of by-products in most synthetic methods limit their industrial production and wide application in various fields. Among them, the hydrothermal method is recognized as the best synthetic method because of its si...

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Problems solved by technology

Therefore, the equipment used in the synthesis method is expensive, the operation is complicated, and the by-product pollution is serious; the synthetic carbon dots have poor luminescence stability, and the optical properties are easily disturbed by the outside world and the luminescence is single.

And at present, most of the carbon dots synthesized by hydrothermally using green and cheap raw materials as carbon sources do not have up-conversion properties or their up-conversion fluorescence properties are poor, and the analytical application based on their up-conversion fluorescence has not been reported yet.

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