Switching fluorescent carbon dot as well as preparation method and application thereof

Abstract

The invention provides a switching fluorescent carbon dot as well as a preparation method and application thereof. The fluorescent carbon dot is an N,S-codoped fluorescent carbon dot (N,S-CDs). The preparation method comprises the following steps: (1) weighing glucose, adding sulfuric acid having the concentration of 50-95%, uniformly stirring, and dropwise adding ethidene diamine; (2) washing theproduct formed in the step (1) with ultrapure water, filtering, and removing the insoluble substance to obtain the supernatant; (3) freeze-drying the supernatant, thereby obtaining the yellow powder,namely the switching fluorescent carbon dot. The N,S-CDs and N,S-CDs / Cr(VI) respectively have excellent selectivity and sensitivity on Cr(VI) and AA based on an inner filter effect, the Cr(VI) and AAcan be recognized in a label-free manner and continuously determined, the linearity range of the detected Cr(VI) and AA is wide, and the detection limit is low. The N,S-CDs can be used for detectingCr(VI) in water and AA in foods. The 'AND' logic gate on a molecular level can be constructed based on specific recognition of the system on the Cr(VI) and AA. In addition, the prepared N,S-CDs has excellent biocompatibility, and can be used for multichannel cell imaging and determination of Cr(VI) and AA in living cells.

Description

Technical field [0001] The invention relates to fluorescent carbon dots, in particular to a switch-type N and S co-doped fluorescent carbon dots and a preparation method thereof, and the application of the carbon dots in detecting Cr(VI) and ascorbic acid. Background technique [0002] Carbon dots (CDs) are a new type of carbon-based nanomaterials discovered in 2014. They have many superior characteristics, such as excellent optical properties, good water solubility, low toxicity, cheap and easy to obtain, and 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. Chromium compounds are widely found in many industries, such as welding, metal surface treatment and leather tanning. There are two main valence states of chromium (Cr) in the environment, namely Cr(Ⅲ) and Cr(VI). Cr(VI) can cause human respiratory and digestive syste...

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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