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Device of fast synthetizing CdSe quantum dots and method thereof

A cadmium selenide, quantum dot technology, applied in chemical instruments and methods, binary selenium/tellurium compounds, nanotechnology, etc., can solve problems such as high pressure drop, limited application, etc., to achieve enhanced in-situ mixing, efficiency improvement, and improvement The effect of residence time distribution

Inactive Publication Date: 2009-10-28
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

The microfluidic method based on multiphase flow can obtain relatively uniform residence time, but its high pressure drop limits its application in the mass synthesis of quantum dots

Method used

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  • Device of fast synthetizing CdSe quantum dots and method thereof
  • Device of fast synthetizing CdSe quantum dots and method thereof
  • Device of fast synthetizing CdSe quantum dots and method thereof

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Embodiment 1

[0029] 1) 64.25mg of CdO, 0.8ml of oleic acid, 1.0ml of oleylamine, 0.6g of tri-n-octylphosphine oxide, and octadecene form a mixture with a total volume of 3ml, and the mixed solution is heated at 150°C for 1.5 hours to obtain Transparent Cd precursor; Se precursor was prepared in a similar manner: 39.5 mg of Se powder was dissolved in 1 ml of trioctylphosphine, 1 ml of oleylamine, and 1 ml of octadecene to form a colorless and transparent solution with a total volume of 3 ml. The two precursors were loaded into 10ml syringes respectively;

[0030] 2) Attached figure 1 The device shown is assembled for the rapid synthesis of cadmium selenide quantum dots. A polytetrafluoroethylene capillary with a length of 35 cm and an inner diameter of 300 μm was used as a reaction microchannel, which was alternately wound radially back and forth along two stainless steel rods 7 with an outer diameter of 700 μm and extended axially to form a curved microchannel 5 . Place the curved microc...

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Abstract

The invention relates to a device of fast synthetizing CdSe quantum dots and a method thereof. The device is connected with a Y-shaped tee 3 through Cd and Se precursor injectors, a polyfluortetraethylene connecting pipe 9 is sequentially connected with the Y-shaped tee 3, a convection micromixer 4, a bending micro-channel 5 and a liquid trap 8; particularly, the bending micro-channel is formed by alternatively winding a capillary tube along an external template, thereby obtaining a reaction channel with geometrical turning and causing nonsymmetry of fluid flow field. The device strengthens the mixing of fluid by utilizing the consecutive transition of the geometrical turning along axial direction and radial direction, thereby improving the uniformity of detention time and concentration distribution. The device and method of the invention lead the prepared quantum dots to be uniform in size; simultaneously, based on same temperature and detention time, by the variation of the relative sample injection ratio of Cd / Se precursor, the fast synthetizing of CdSe nanocrystalline in wide particle size range can be realized, and high quality CdSe nanocrystalline with adjustable fluorescence spectrum can be synthetized continuously.

Description

technical field [0001] The invention relates to a device and method for rapidly synthesizing nanocrystals by improving the residence time distribution of precursors in microchannels, and belongs to the field of microchemical mechanical systems and nanomaterial preparation. Background technique [0002] Quantum dots, also known as "artificial atoms", have broad application prospects in many fields such as biomedicine, catalysis, information storage, solar cells, and light-emitting devices. Semiconductor nanocrystal fluorescent probes have promoted the rapid development of technologies such as drug screening, targeted drug delivery, and in situ observation of cells. Color saturation and other aspects also reflect unparalleled superiority. In addition, hot-carrier collection, transport, and multi-exciton generation enabled by quantum dots are expected to enable next-generation solar cells to achieve 66% efficiency. Therefore, the application of semiconductor nanocrystals in p...

Claims

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Application Information

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IPC IPC(8): C01B19/04C09K11/88B82B3/00
Inventor 栾伟玲杨洪伟万真付红红刘鹏周鑫尹程程涂善东
Owner EAST CHINA UNIV OF SCI & TECH
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