A kind of preparation method of carbon dot and its array

Abstract

The invention discloses a preparation method of a carbon dot and an array thereof. A nano-gold macromolecular membrane is illuminated by laser so that nano-gold is subjected to surface plasmon resonance and temperature rising, and a macromolecular structure at the periphery is damaged to form the carbon dot. The method disclosed by the invention is simple to operate and the preparation success rate can reach 100 percent; the prepared carbon dot can send out intensive fluorescent light under the stimulation of light in a range of 220nm to 550nm; the carbon dots can be used for preparing various arrayed carbon dot arrays; the fluorescence intensity of the carbon dot can be controlled through adjusting the laser illumination time and power and controlling the size of the carbon dot; the prepared carbon dot array can form an invisible fluorescence array and encrypted information transmission can be realized. Meanwhile, trace detection of ions or molecules can also be realized by utilizing quenching characteristics of the ions or molecules to be detected on the fluorescent light.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing carbon nanometer dots and arrays thereof. Background technique [0002] Carbon dots (carbon nanodots) are near-spherical zero-dimensional semiconductor nanocrystals with a diameter of ≤10 nm. They are composed of very few molecules or nanoclusters mainly composed of carbon atoms. The absorption peak is very broad and covers ultraviolet~ Visible light region. More importantly, carbon dots have good biocompatibility, easy functionalization of surface groups, and sensitive fluorescence responses to many anions and cations and molecules (expressed as carbon dot fluorescence quenching or enhancement) and are used for these ions, cations, and molecules. Ultra-low limit detection of molecules, therefore, since 2004 by Xu et al. (Xu X Y, Ray R, Gu Y L, Ploehn H J, Gearheart L, Paker K, Scrivens W A, J. Am. Chem. Soc. , 2004, 126: 12736. ) has attr...

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Problems solved by technology

Even so, from 2μm spacing, 1μm fluorescent spot width (that is, every 3μm is the fluorescent array period) or > 5000 / cm 2 The fluorescence array goal is also far from being reached

[0007] On the other hand, a large number of existing gene chip DNA detection methods use fluorescence recognition. Due to the extremely weak fluorescence of single-molecule DNA, it is the only choice to use confocal laser microscopy imaging equipment to observe and record. This equipment is expensive (more than 2 million RMB ), the use cost is high, which is not conducive to mass promotion

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