Wet-solid phase reaction preparation method for cadmium sulfide semiconductor nanocrystalline

Abstract

The preparation method of wet-solid-phase reaction of cadmium sulfide semiconductor nanocrystals comprises the following steps: mixing thioglycolic acid and cadmium chloride in a molar ratio of 1.8 to 2.2:1, grinding; adding deionized water to wash away excess thioglycolic acid, filtering, and filter cake Wash with deionized water; mix the filter cake and sodium sulfide in a molar ratio of 1 to 3.5:2, and grind to obtain a light yellow solid; dissolve the light yellow solid obtained in the previous step in water, and then add acetone or ether to make The CdS sol settles; filters, washes, and dries to obtain nanometer CdS crystals. The invention has mild reaction conditions, simple process, high yield, uniform particle size, no agglomeration phenomenon and good reproducibility. Compared with traditional bioluminescent probes (organic dyes), the excitation spectrum of nanocrystals is wide and continuously distributed, the emission spectrum is symmetrically distributed and narrow in width, and the color is adjustable. It is used in bioluminescent probes and has good properties. development and application prospects.

Description

technical field [0001] The invention relates to a method for preparing cadmium sulfide (CdS) nanocrystals, in particular to a wet-solid phase reaction preparation method for cadmium sulfide nanocrystals used as bioluminescent probes. Background technique [0002] CdS is a typical II-VI optoelectronic semiconductor material, which has a wide range of applications in light-emitting diodes, solar cells, photocatalysis, nonlinear optical materials, sensors and information storage, etc. CdS semiconductor nanomaterials have always been researched by people. hotspots. In recent years, the use of CdS semiconductor nanomaterials in biological probes has gradually attracted people's attention. At present, the preparation of CdS semiconductor nanomaterials is mainly carried out by solvothermal reaction, electrochemical deposition, sol-gel and other methods. Although these methods have their advantages, the preparation of CdS nanomaterials with good water solubility and biological mac...

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Problems solved by technology

However, if they are directly studied by fluorescence spectroscopy, the fluorescence quantum yield of bases and nucleic acids is very low, so the best way to detect them is to use various fluorescent probes

At present, the most commonly used fluorescent probes are organic dyes. In most cases, it is difficult to excite multiple components at the same time due to their narrow excitation spectrum, and their fluorescence characteristic spectrum is wide and the distribution is uneven. Symmetry, which makes it difficult to distinguish the fluorescence of different probe molecules, so it is difficult to detect multiple components at the same time

The most serious defect of organic dyes is poor photochemical stability. Photobleaching and photolysis make it impossible for each dye probe to emit too many fluorescent photons on average, and photolysis products often have a killing effect on organisms.

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