熔融法制备玻璃基底PbS纳米晶体

发布时间：2018-09-05 11:40

【摘要】： 近年来,人工纳米晶体材料发展迅速。尺寸在几个纳米范围内的半导体PbS纳米晶体在近红外光通信波段(1.3~1.55μm)有良好的吸收和辐射,可用于光通信波段的光放大。此外,由于量子点玻璃材料透明、化学稳定、热稳定、较短的响应时间和较高的三阶非线性极化率,在光电器件和光学装置等方面也显示了较强的优势。因此,如何在玻璃基底中直接生成半导体PbS纳米晶体,作为量子点激光器和放大器增益介质材料,从而构成各类光通信器件,是今后新型光通信材料的一个研究热点。本文通过熔融法制备了玻璃基底的PbS纳米晶体。采用X射线衍射仪(XRD)、高分辩透射电镜(TEM)、近红外吸收光谱仪等表征手段,检测出熔融后缓慢降温制备的玻璃基底PbS纳米晶体的尺寸在6~10nm,但粒子间有团聚。研究了不同成分玻璃基底中生长PbS纳米晶体的差异,讨论了不同掺杂剂(PbO和S、PbS)和不同掺杂量对析出的纳米晶体尺寸带来的影响。本文首次在熔融后采用缓慢降温,此方法比传统熔融法更容易析出PbS纳米晶体,但也存在一些缺点:纳米晶体尺寸难以控制,纳米粒子间有团聚现象和尺寸分布不均匀。
[Abstract]:In recent years, artificial nanocrystalline materials have developed rapidly. Semiconductor PbS nanocrystals of several nanometers have good absorption and radiation in the near infrared communication band (1.3n 1.55 渭 m), which can be used for optical amplification in optical communication band. In addition, due to the transparent, chemically stable, thermal stability, short response time and high third-order nonlinear polarizability of the QDs glass materials, the QDs also show strong advantages in optoelectronic devices and optical devices. Therefore, how to directly generate semiconductor PbS nanocrystals in glass substrates, which can be used as gain dielectric materials for quantum dot lasers and amplifiers, has become a hot research topic of new optical communication materials in the future. In this paper, PbS nanocrystals on glass substrates were prepared by melting method. By means of X-ray diffractometer (XRD), high resolution transmission electron microscope (XRD),) (TEM), near infrared absorption spectrometer the size of PbS nanocrystalline on glass substrate prepared by slow cooling after melting was found to be 6 ~ 10 nm but there was agglomeration among the particles. The differences of PbS nanocrystals grown on glass substrates with different compositions were investigated. The effects of different dopants (PbO and SbS) and different doping contents on the size of precipitated nanocrystals were discussed. In this paper, the PbS nanocrystalline is precipitated more easily than the traditional melting method for the first time after melting, but there are some disadvantages: the size of the nanocrystalline is difficult to control, there is agglomeration among the nanoparticles and the size distribution is not uniform.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TB383.1

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