Method for synthesizing monodisperse colloid lead sulphide quantum dots with laser
A technology of laser synthesis and lead sulfide, applied in the field of nanomaterials, can solve the problems of toxic precursors, high synthesis temperature, and impure products, and achieve the effects of simple and low toxicity of raw materials, low reaction temperature, and no by-products and impurities.
Inactive Publication Date: 2012-12-19
TIANJIN UNIV
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[0005] The purpose of the present invention is to solve the problems of toxic precursors, high synthesis temperature, and impure products in the existing chemical synthesis process for preparing monodisperse colloidal lead sulfide quantum dots, and use long pulse millisecond lasers to select quantum dots of different sizes Based on the characteristics of non-volatile gasification, it provides a method for controllable synthesis of monodisperse colloidal lead sulfide quantum dots with good dispersion and crystallinity and high purity by using millisecond laser liquid phase ablation and irradiation process
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[0029] Such as figure 1 As shown in (a), place a lead target with a purity of 99.99% and a thickness of 5 mm in 100 mL of dodecanethiol, adjust the height of the target support to ensure that the distance between the liquid level and the upper surface of the lead target is 5 mm, and use millisecond pulse Nd: YAG laser (fundamental frequency, wavelength 1064nm) is focused on the ablation target surface, the laser pulse width is 2ms, the repetition frequency is 2Hz, the single pulse energy is 4J, and the focal spot diameter is 0.2mm. When the millisecond laser ablates the lead target in the liquid medium, the sputtered lead nano-droplets react with the surrounding dodecanethiol during the cooling process to form lead sulfide nanocrystals with a particle size of 20-50 nm, such as figure 2 shown. During the laser ablation process, magnetic stirring is used to avoid laser ablation of the generated lead sulfide nanocrystals as much as possible.
[0030]During the laser ablation p...
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Abstract
The invention discloses a method for synthesizing monodisperse colloid lead sulphide quantum dots with laser; a block-shaped metal lead target serves as a raw material and is arranged in dodecyl mercaptan, and millisecond pulse laser is used for ablating the lead target; a product which is ablated by the laser is purified, dried, weighed and re-scattered in the dodecyl mercaptan, and initial galena nanocrystalline suspension with the concentration being 4.3mM is prepared; 90 percent of the dodecyl mercaptan is added into the initial galena nanocrystalline suspension with the volume percentage being 10 percent, and initial galena nanocrystalline suspension with the concentration being 0.43mM is obtained and heated in water bath; and millisecond pulse laser which is not focused is used for radiating the suspension for 20 minutes, and the high-purity monodisperse colloid lead sulphide quantum dots with good dispersion and crystallinity are obtained. According to the method for synthesizing monodisperse colloid lead sulphide quantum dots with laser, the process is simple and convenient, the control is easy, no by-products and impurities are produced, raw materials are simple and low-toxin, the reaction temperature is low, and the method is an environment-friendly green synthesis process.
Description
technical field [0001] The invention relates to nanometer materials, in particular to a method for synthesizing monodisperse colloidal lead sulfide (PbS) quantum dots by using laser liquid phase ablation and irradiation technology. Background technique [0002] Due to the quantum confinement effect, semiconductor quantum dots have electrical and optical properties that vary significantly with size, and have broad application prospects in optoelectronics and biotechnology. See: A.J.Nozik, M.C.Beard, J.M.Luther et al, Chemical Reviews, 2010, 110, 6873-6890; I.L. Medintz, H.T. Uyeda, E.R. Goldman et al, Nature Materials, 2005, 4, 435-446. Whether the size is uniform is very important for the performance regulation and future application of quantum dots. For example, quantum dots with uniform size emit sharp light, and the luminous peak position can be precisely adjusted with the size of quantum dots. It is an ideal material for manufacturing high-performance light-emitting devi...
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IPC IPC(8): C01G21/21C09K11/66B82Y30/00
Inventor 杨静杜希文高敏锐
Owner TIANJIN UNIV
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