Method for preparing solid light-emitting carbon point

Abstract

The invention provides a method for preparing a solid light-emitting carbon point, namely, a method for preparing a solid light-emitting carbon point from cereal raw materials such as wheat flour, corn powder, rice powder, sorghum flour and millet flour as a C-containing precursor, and belongs to the field of preparation of nano materials. The method comprises the following steps: by taking cereal raw materials such as wheat flour as the C-containing precursor, preparing to obtain a precursor solution of certain concentration, and performing simple post-treatment under hydrothermal conditions without any chemical reagent, thereby achieving green synthesis of the carbon point which can emit light in both liquid and solid states. The method effectively solves the problems that the carbon point prepared by the traditional method emits light in a solution and the phenomenon of solid-state fluorescence quenching is caused after drying. The raw materials of the preparation method are cheap and easy to obtain, the synthesis route is simple, the raw materials are safe and non-toxic, and the product is completely green. The solid light-emitting carbon point prepared by using the method is powdery, easy to disperse, and beneficial for further utilization. The light can be emitted from the solid just like in a solution, and has obvious dependency of excitation wavelength.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer materials, in particular to a preparation method of solid-state luminescent carbon dots. Background technique [0002] Since the first discovery of carbon dots in 2004, carbon dots have been widely used in bioimaging and drug delivery due to their unique optical properties, good water solubility, easy functional modification, excellent chemical stability, low biological toxicity, and easy large-scale synthesis. , fluorescence sensing, optoelectronic devices and other fields have received great attention. At present, there are mainly physical synthesis methods and chemical synthesis methods for carbon dots. Chemical synthesis methods mainly include: electrochemical synthesis, microwave-assisted synthesis, chemical oxidation, high-temperature pyrolysis, and hydrothermal synthesis. [0003] The hydrothermal synthesis method refers to placing the C-containing precursor in a high-pressure react...

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Problems solved by technology

However, the composite materials synthesized by this type of system often have a fixed morphology, and the polymer is easy to form a film, which is not conducive to further dispersion; Shen Dezhen's research group at the Changchun Institute of Optics and Mechanics reported for the first time that carbon quantum dots were doped into the starch matrix. The amino groups on the surface of carbon quantum dots can form hydrogen bonds with the hydroxyl groups on the surface of starch, which can inhibit the non-radiative transition of surface energy and effectively suppress the fluorescence quenching phenomenon of solids. This method has potential promotion significance for the solid application of carbon quantum dots

However, this method is a two-step synthesis, that is, carbon quantum dots are synthesized first, and then dispersed into the starch matrix, and the synthesis cycle is relatively long.

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