A switch-type fluorescent carbon dot and its preparation method and application

Abstract

The present invention provides a switch-type fluorescent carbon point and its preparation method and application. The fluorescent carbon point is a kind of N, S co-doped fluorescent carbon point (N, S-CDs), and its preparation method comprises the following steps (1) take glucose by weighing, add the sulfuric acid of concentration 50~95%, stir evenly, then dropwise add ethylenediamine; (2) wash the product that step (1) forms with ultrapure water, filter, remove insoluble matter to obtain supernatant; (3) freeze-drying the supernatant to obtain a yellow powder, which is a switch-type fluorescent carbon dot. N,S‑CDs and N,S‑CDs / Cr(VI) have good selectivity and sensitivity to Cr(VI) and AA respectively based on the inner filter effect, and can identify and continuously measure Cr(VI) and AA without labeling , the detection of Cr(VI) and AA has a wide linear range and a low detection limit. N,S‑CDs can be used to detect Cr(VI) in water and AA in food. Based on the specific recognition of Cr(VI) and AA by this system, an "AND" logic gate at the molecular level can be constructed. In addition, the prepared N,S-CDs have good biocompatibility, and can also be used for multi-channel cell imaging and the determination of Cr(VI) and AA in living cells.

Description

technical field [0001] The invention relates to a fluorescent carbon point, in particular to a switch-type N, S co-doped fluorescent carbon point and a preparation method thereof, and the application of the carbon point in detecting Cr(VI) and ascorbic acid. Background technique [0002] Carbon dots (CDs) are a new type of carbon-based nanomaterials discovered in 2014, which have many superior properties, such as excellent optical properties, good water solubility, low toxicity, cheap and easy to obtain, and have excellent biological properties. compatibility. Based on these advantages, CDs are widely used in many fields, such as cell imaging technology, environmental monitoring, drug delivery and targeted imaging, etc. Chromium compounds are widely found in many industries such as welding, metal finishing and leather tanning. Chromium (Cr) in the environment mainly exists in two valence states, Cr(III) and Cr(VI). Cr(VI) can cause human respiratory and digestive system d...

AI Technical Summary

Problems solved by technology

The reaction conditions of the invention are high temperature and high pressure, the reaction time is long, and the post-treatment is cumbersome

[0006] The above preparation methods of carbon dots all have the problems of high reaction temperature, long reaction time and complicated post-processing.

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