Orange light and infrared emission polymer carbon nanodot and preparation method thereof

Abstract

The invention discloses orange light and near-infrared emission polymer carbon nanodots and a preparation method thereof, and belongs to the technical field of carbon nanomaterial preparation. A hydrothermal reaction is carried out in a high-temperature reaction kettle by using a mixed solution of dopamine and o-phenylenediamine so as to prepare a carbon dot water solution, and carbon dot solid powder with high quantum yield is obtained through simple separation and purification. The method disclosed by the invention overcomes the disadvantages of an existing method that the preparation is difficult, the cost is high and the emission wavelength of the prepared carbon dots is short, and the near-infrared emission polymer carbon dots can be obtained through simple one-step hydro-thermal synthesis of two molecules. The obtained polymer carbon dots are dispersed in an ethanol solution, and under the irradiation of a portable ultraviolet lamp, the polymer carbon dots can give out bright red light. The method disclosed by the invention is simple and practicable, low in cost and high in yield, is applicable to mass production, and has wide application prospects in the fields such as biological living imaging, fluorescence printing and warm white diode illumination.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterial preparation, in particular to an orange-red light and near-infrared emitting polymer carbon nano-dot with high fluorescence quantum yield prepared by hydrothermal method using two molecules of dopamine and o-phenylenediamine Preparation. Background technique [0002] Fluorescent carbon dot material is a new kind of fluorescent probe material. Due to its low toxicity, effective chemical modification, good stability and biocompatibility, it has broad application prospects in the fields of bioimaging, medical diagnosis, catalysis and photovoltaic devices. Therefore, fluorescent carbon dot materials are called "a new generation of carbon nano light". [0003] Since 2004, many types of carbon dots have been successfully prepared, and the methods of synthesizing carbon dots are also varied. However, most of the obtained carbon dots emit blue or green fluorescence, and red light and near-in...

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Problems solved by technology

[0003] Since 2004, many types of carbon dots have been successfully prepared, and the methods of synthesizing carbon dots are also various, but most of the obtained carbon dots emit blue or green fluorescence, red light and near-infrared band fluorescent carbon dots are rare

However, the absence of fluorescent carbon dots in red light and near-infrared bands greatly limits the further development and application of carbon dots.

This is because in living biological imaging, a large number of fluorescent substances that exist in the living body will produce non-specific fluorescence (mostly blue fluorescence) after being excited. This "background noise" makes the signal-to-noise ratio of living fluorescent imaging low. , which reduces the resolution and sensitivity

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