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Preparation method of transition metal compound layered quantum dot solution
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A transition metal and quantum dot solution technology, applied in chemical instruments and methods, nanotechnology, nano optics, etc., can solve problems such as poor crystallinity, and achieve the effect of simple process, convenient operation, and good crystallinity
Inactive Publication Date: 2015-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
Therefore, from some reported methods for preparing layered quantum dots of transition metal compounds, 1nm-sized quantum dots have not been reported yet.
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Embodiment 1
[0029] MoS 2 Preparation of layered quantum dot solution:
[0030] 1) Put 1.5g block M O S 2 Add 0.24g of the active agent Brij-35 to an 80 ml ultrasonic bottle in turn, and then add 60 ml of water, then mechanically stir for 5 min, and stir well at 100W, 40KH Z Ultrasonic shock for 24h;
[0031] 2) The M after the above ultrasonic oscillation O S 2 Centrifuge the suspension at 15000 r / min for 10 min or use a 10000Da dialysis bag
[0032] After 6 hours of dialysis, the supernatant after centrifugation or the exudate after dialysis is MoS uniformly distributed at 1-2nm 2 Layered quantum dot solution, high resolution transmission electron microscopy (HRTEM) image such as figure 2 Shown.
Embodiment 2
[0034] MoS 2 Preparation of layered quantum dot solution:
[0035] 1) Put 1.5g block MoS 2 Add 0.24g of the active agent Brij-35 into an 80 ml ultrasonic bottle, and then add 60 ml of NMP, and stir well at 100W, 40KH Z Ultrasonic vibration for 12h;
[0036] 2) The MoS after the above ultrasonic oscillation 2 The suspension was centrifuged at 15000 r / min for 10 min, and the supernatant after centrifugation was MoS uniformly distributed at 1-2nm 2 Layered quantum dot solution.
Embodiment 3
[0038] MoS 2 Preparation of layered quantum dot solution:
[0039] 1) Put 1.5g block MoS 2 Add 5 ml of the active agent Tween-20 into an 80 ml ultrasonic bottle, and then add 60 ml of ethanol, and then mechanically stir for 5 minutes, and stir well at 150W, 10KH Z Ultrasonic vibration for 24h;
[0040] 2) The MoS after the above ultrasonic oscillation 2 The suspension is centrifuged at 15000 r / min for 10 min or dialyzed with a 10000 Da dialysis bag for 6 hours. The supernatant after centrifugation or the exudate after dialysis is MoS uniformly distributed at 1-2 nm 2 Layered quantum dot solution.
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Abstract
The invention discloses a preparation method of a layered transition metal compound quantum dot solution, the preparation method comprises the following steps: mixing a layered transition metal compound, an active agent and a solvent, stirring evenly, performing ultrasonic vibration for 2-24h, performing centrifugal separation or dialysis separation to obtain a supernatant or an infiltration liquid which is the nano-layered transition metal compound quantum dot solution, wherein the concentration of the layered transition metal compound is 1-150mg / ml, the concentration of the active agent is 0.5-10mg / ml, the layered transition metal compound is MOS2, MOTe2, WS2, WSe2 or WTe2, the active agent is a non-ionic surfactant or an ionic surfactant, and the solvent is one or a plurality substances from of water and organic solvents. The preparation method provided by the invention is simple in process, easy to operate, green, environmentally friendly, and suitable for industrialized production, is a method for preparation of a layered ultra small quantum dot solution, and can be used for preparation of an evenly-distributed ultra small quantum dot solution with a size of 1-2nm.
Description
technical field [0001] The invention relates to a preparation method of a quantum dot solution, in particular to a preparation method of a transition group metal compound layered quantum dot solution. Background technique [0002] transition metal compounds such as M O S 2 , M O Se 2 , M O Te 2 、WS 2 、WSe 2 , WTe 2 , these compounds have the same layered structure as graphene, and the layers are combined with weak van der Waals force, which is a good solid lubricant and catalyst. This type of semiconductor material, when changing from a bulk to a single-layer 2D structure, there will be a sudden change from an indirect bandgap to a direct bandgap. The single-layer LTMDS has a high switching ratio up to 1X10 8 , electron mobility 200 cm 2 ·V -1 ·s -1 . The monolayer transition metal compound greatly improves its fluorescence effect. The electronic properties of this class of transition metal 2D materials depend on their thickness, MX 2 The thickness bandgap of ...
Claims
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