CN110922960B - Method for constructing oil-phase chiral colloidal semiconductor nanocrystal - Google Patents
Method for constructing oil-phase chiral colloidal semiconductor nanocrystal Download PDFInfo
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Abstract
The invention provides a method for constructing oil-phase chiral colloidal semiconductor nanocrystals, which comprises the following steps: dispersing the semiconductor nanocrystalline material in a nonpolar solvent to obtain a high-concentration colloidal solution; and dispersing chiral molecules in a nonpolar solvent to obtain a high-concentration chiral solution; dropwise adding the high-concentration colloidal solution into the high-concentration chiral solution to obtain an oil-phase chiral semiconductor colloidal solution; the invention selects the chiral nonpolar solvent, disperses the semiconductor nanocrystal into the solvent, and then generates the chiral colloidal semiconductor nanocrystal through the induction of the nonpolar solvent, thereby constructing the oil-soluble chiral colloidal semiconductor nanocrystal material with high optical activity.
Description
Technical Field
The invention relates to the field of nano material preparation, in particular to a method for constructing oil phase chiral colloid semiconductor nanocrystals.
Background
With the development of nanotechnology, the current reports of chiral semiconductor nanomaterials show that chiral nanocrystals have potential application values in the fields of chiral identification, cytotoxicity and cell imaging, asymmetric catalysis and separation of counterparts, circularly polarized light sources, electron spin directional resolution, gene shearing and the like;
chirality is a science closely related to life, and DNA, amino acids and saccharides constituting a living body are single chirality; with the development of nano science, novel chiral nano materials are also developed rapidly, and the current reports show that chiral nanocrystals have potential application values in the fields of chiral identification, cytotoxicity and cell imaging, asymmetric catalysis and corresponding body splitting, circularly polarized light sources, electron spin directional resolution, gene shearing and the like;
at present, the construction method of the chiral semiconductor nano material mainly comprises two methods: (1) The semiconductor nanocrystal obtained by the method has poor monodispersity, can synthesize a single nanomaterial, and basically only can obtain a quantum dot material; (2) The method comprises the steps of obtaining semiconductor nanocrystals by a hot injection method, and then connecting chiral ligands to the surfaces of the nanocrystals by ligand exchange to obtain various semiconductor nanocrystals, such as CdSe quantum dots, quantum rods, nanosheets and the like, wherein the ligands can also be chiral polyacid and the like, but the construction of a water phase usually causes fluorescence quenching, so that the circular dichroism luminescence performance of a semiconductor luminescent material is reduced.
Disclosure of Invention
Aiming at the problems, the invention provides a method for constructing oil-phase chiral colloidal semiconductor nanocrystals, which comprises the steps of selecting a chiral nonpolar solvent, dispersing semiconductor nanocrystals into the solvent, inducing by the nonpolar solvent to generate chiral colloidal semiconductor nanocrystals, and constructing the oil-soluble chiral colloidal semiconductor nanocrystal material with high optical activity.
The invention provides a method for constructing oil-phase chiral colloidal semiconductor nanocrystals, which comprises the following steps:
the method comprises the following steps: selecting a semiconductor nanocrystalline material and a nonpolar solvent, and then dispersing the semiconductor nanocrystalline material in the nonpolar solvent to obtain a high-concentration colloidal solution;
step two: selecting chiral molecules, and dispersing the chiral molecules in a nonpolar solvent to obtain a high-concentration chiral solution;
step three: and (3) dropwise adding the high-concentration colloidal solution into the high-concentration chiral solution to obtain the oil-phase chiral semiconductor colloidal solution.
The further improvement lies in that: in the first step, the semiconductor nanocrystalline material is dispersed in a nonpolar solvent, stirring is needed, the stirring time is controlled to be 5-7 minutes, and the stirring speed is controlled to be 25-35 revolutions per minute.
The further improvement lies in that: the semiconductor nanocrystalline material in the first step is any one of semiconductor quantum dots, quantum rods or nanosheets.
The further improvement lies in that: the semiconductor nanocrystalline material in the first step can be a semiconductor nanocrystalline material with any structure.
The further improvement lies in that: and in the second step, when the chiral molecules are dispersed in the nonpolar solvent, stirring for 3 minutes is required, and the stirring speed is controlled to be 20-25 revolutions per minute.
The further improvement is that: and in the third step, when the high-concentration colloidal solution is dripped into the high-concentration chiral solution, the mass ratio of the high-concentration colloidal solution to the high-concentration chiral solution is 100.
The invention has the beneficial effects that: the invention selects chiral nonpolar solvent, disperses semiconductor nano-crystal into the solvent, and then generates chiral colloidal semiconductor nano-crystal through nonpolar solvent induction, thus constructing the oil-soluble chiral colloidal semiconductor nano-crystal material with high optical activity.
Drawings
FIG. 1 is a circular dichroism spectrum of an oil-soluble chiral CdSe nanosheet in an embodiment of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
According to fig. 1, this embodiment proposes a method for constructing an oil-phase chiral colloidal semiconductor nanocrystal, which includes the following steps:
the method comprises the following steps: selecting a semiconductor nanocrystalline material and a nonpolar solvent, then dispersing the semiconductor nanocrystalline material in the nonpolar solvent to obtain a high-concentration colloidal solution, dispersing the semiconductor nanocrystalline material in the nonpolar solvent, and stirring at a stirring speed of 25-35 r/min for 5-7 min to obtain a nanosheet with any structure;
step two: selecting chiral molecules, dispersing the chiral molecules in a nonpolar solvent, stirring for 3 minutes when the chiral molecules are dispersed in the nonpolar solvent, and controlling the stirring speed to be 20-25 r/min to obtain a high-concentration chiral solution;
step three: and (3) dropwise adding the high-concentration colloidal solution into the high-concentration chiral solution, wherein the mass ratio of the high-concentration colloidal solution to the high-concentration chiral solution is 100.
In the embodiment, oleylamine and n-octylamine solution are used as solvent and ligand to prepare CdSe nanosheet with wurtzite crystal structure, and the semiconductor nanocrystal is stored in chloroform; weighing 1g/L menthol, dissolving the menthol in chloroform to prepare 3 ml chiral solution; then, 100 microliter CdSe nanosheet solution is dripped into the solution, and the obtained colloidal solution is the oil-phase chiral semiconductor colloidal solution.
The invention selects chiral nonpolar solvent, disperses semiconductor nano-crystal into the solvent, and then generates chiral colloidal semiconductor nano-crystal through nonpolar solvent induction, thus constructing the oil-soluble chiral colloidal semiconductor nano-crystal material with high optical activity.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A method for constructing oil phase chiral colloid semiconductor nanocrystalline is characterized in that: the method comprises the following steps:
the method comprises the following steps: selecting a semiconductor nanocrystalline material and a nonpolar solvent, and then dispersing the semiconductor nanocrystalline material in the nonpolar solvent to obtain a high-concentration colloidal solution;
the semiconductor nanocrystalline material can be a semiconductor nanocrystalline material with any structure;
preparing the semiconductor nanocrystalline material by taking oleylamine and n-octylamine solution as a solvent and a ligand;
step two: selecting chiral molecules, dispersing the chiral molecules in a nonpolar solvent, stirring for 3 minutes, and controlling the stirring speed to be 20-25 r/min to obtain a high-concentration chiral solution;
the nonpolar solvent is chloroform; preparing a chiral solution by dissolving menthol in the chloroform;
step three: dropwise adding the high-concentration colloidal solution into the high-concentration chiral solution to obtain an oil-phase chiral semiconductor colloidal solution;
wherein the mass ratio of the high-concentration colloidal solution to the high-concentration chiral solution is 100.
2. The method for constructing oil-phase chiral colloidal semiconductor nanocrystals, as claimed in claim 1, wherein: in the first step, the semiconductor nanocrystalline material is dispersed in a nonpolar solvent, and needs to be stirred, wherein the stirring time is controlled to be 5-7 minutes, and the stirring speed is controlled to be 25-35 revolutions per minute.
3. The method for constructing oil-phase chiral colloidal semiconductor nanocrystals, as claimed in claim 1, wherein: the semiconductor nanocrystalline material in the first step is any one of semiconductor quantum dots, quantum rods or nanosheets.
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