Synthesis method of colloidal semiconductor sheet-shaped nanocrystal
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A nanocrystal and synthesis method technology, applied in nanotechnology, nanooptics, nanotechnology, etc., can solve the problems of uncontrollable fluorescence peak and low fluorescence quantum yield, so as to eliminate and isolate surface defects, isolate surface defects, and reduce complexity. degree of effect
Active Publication Date: 2021-12-28
PEKING UNIV
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[0003] Aiming at the problems of multi-step synthesis of colloidal semiconductor flake nanocrystals in the prior art, low fluorescence quantum yield and uncontrollable fluorescence peak, the present invention proposes a Synthesis method of colloidal semiconductor flake nanocrystal
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Embodiment 1
[0024] The synthetic method of the colloidal semiconductor flaky nanocrystal of the present embodiment comprises the following steps:
[0025] 1) Preparation of sulfur precursor:
[0026]5 millimoles of sulfur element and 5 millimoles of oleic acid were added to 50 milliliters of octadecene organic solution, ultrasonically vibrated and mixed for 15 minutes to obtain a clear sulfur precursor, wherein the concentration of sulfur was 0.1 Moles per liter, the concentration of oleic acid is 0.1 moles per liter;
[0027] 2) Prepare the seed crystals of colloidal semiconductor flake nanocrystals:
[0028] Using the hot injection method, add 15 ml of octadecene, 0.3 mmol of cadmium myristate and a stirring magnet into the three-necked flask, and equip the three-necked flask with a temperature control device, a temperature detection device, a double-row tube and a magnetically controlled stirring Taiwan; wherein, the temperature control device heats or cools down the mixture in the r...
Embodiment 2
[0035] The synthetic method of the colloidal semiconductor flaky nanocrystal of the present embodiment comprises the following steps:
[0036] 1) Preparation of sulfur precursor:
[0037] 160 milligrams (5 millimoles) of sulfur element and 5 millimoles of oleic acid were added to the organic solution of 50 milliliters of octadecene, and ultrasonic vibration was mixed for 15 minutes to obtain a clarified sulfur precursor, to obtain a clarified sulfur precursor, wherein, The concentration of sulfur is 0.1 mole per liter, the concentration of oleic acid is 0.1 mole per liter;
[0038] 2) Prepare the seed crystals of colloidal semiconductor flake nanocrystals:
[0039] Using the hot injection method, add 15 ml of octadecene, 0.3 mmol of cadmium myristate and a stirring magnet into the three-necked flask, and equip the three-necked flask with a temperature control device, a temperature detection device, a double-row tube and a magnetically controlled stirring Taiwan; wherein, the...
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Abstract
The invention discloses a synthesis method of a colloidal semiconductor sheet-shaped nanocrystal. According to the invention, in a transverse growth process of a seed crystal of a colloidal semiconductor sheet-shaped nanocrystal, a sulfur precursor is rapidly injected for the first time, a fluorescence peak is regulated and controlled by controlling the injection speed and injection amount of the sulfur precursor, and the fluorescence peak moves to a shorter wavelength along with the increase of the injection amount of the sulfur precursor in an early stage; a sulfur precursor is slowly injected for the second time so as to grow a sulfide protection crown on the side edge of the colloidal semiconductor sheet-shaped nanocrystal, wherein the sulfide protection crown has a higher energy gap than the colloidal semiconductor sheet-shaped nanocrystal capable of emitting light, so that surface defects are isolated; the colloidal semiconductor sheet-shaped nanocrystal is used as a light-emitting core, and the sulfur precursor is slowly injected, so that the lattice difference between the light-emitting core and the sulfide protection crown becomes smooth, and the internal defects are eliminated so as to improve the fluorescence quantum yield to 100%; and the use of a sulfur precursor that is easy to prepare further reduces the complexity of synthesis.
Description
technical field [0001] The invention belongs to the field of material synthesis, and in particular relates to a method for synthesizing colloidal semiconductor flake nanocrystals. Background technique [0002] The shape of the colloidal semiconductor sheet nanocrystal is similar to a cuboid, and it is nanoscale. The semiconductor crystal synthesized in the solution has a typical size of 0.3 to 10 nanometers thick, 2 to 100 nanometers long, and 2 to 100 nanometers wide. The typical constituent elements are II-VI group elements (wherein, II=Zn and Cd, VI=S, Se and Te). The prior art is mainly divided into two-step synthesis of colloidal semiconductor flake nanocrystal heterostructures composed of different materials. The first step is to synthesize colloidal semiconductor sheet-like nanocrystals with lower band gaps as fluorescent cores to emit fluorescence. The second step is to synthesize a protective crown with a higher band gap around the fluorescent nucleus to protect t...
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