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Synthesis PbS Nanocrystals in the Glass Matrix by a Melting Method

Author: ZiGuiLin
Tutor: ChengCheng
School: Zhejiang University of Technology
Course: Optics
Keywords: Melting method PbS nanocrystals Glass substrate Optical fiber communication Slow cooling
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 35
Quote: 0
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Abstract


In recent years, the rapid development of artificial nanocrystalline materials . The PbS nanocrystals size in the range of a few nanometers of a semiconductor is amplified light in the communication wavelength band of the near-infrared light (1.3 ~ 1.55μm) have good absorption and radiation , can be used for optical communication band . Further, since the transparent glass material of the quantum dots , the chemical stability, thermal stability, and a shorter response time and a high third order nonlinear optical susceptibility in optoelectronic devices and optical devices, etc. , also shows a strong advantage . So, how in the glass substrate directly generate semiconductor PbS nanocrystals as quantum dot lasers and amplifiers gain medium material , which constitutes all kinds of optical communication devices , is a research focus of the new optical communication materials in the future . This article was prepared by the melting method of a glass substrate PBS nanocrystals . Using X-ray diffraction (XRD), high resolution transmission electron microscopy (TEM), the characterization means of the near-infrared absorption spectrometer to detect the the molten slow cooling after the preparation of the glass substrate PBS nanocrystals size 6 ~ 10nm, but the inter-particle agglomeration . The PbS nanocrystals growth in the different components of the glass substrate Differences discusses the impact of the different dopants (PbO and S, PbS) and different doping amount of the nanocrystal size precipitated . Firstly with slow cooling after melting , this method is easier than the conventional melt method precipitated PbS nanocrystals , but there are some drawbacks : the nanocrystal size, difficult to control the agglomeration and uneven size distribution between the nanoparticles .

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