【摘要】： 近年來,人工納米晶體材料發(fā)展迅速。尺寸在幾個納米范圍內(nèi)的半導體PbS納米晶體在近紅外光通信波段(1.3~1.55μm)有良好的吸收和輻射,可用于光通信波段的光放大。此外,由于量子點玻璃材料透明、化學穩(wěn)定、熱穩(wěn)定、較短的響應(yīng)時間和較高的三階非線性極化率,在光電器件和光學裝置等方面也顯示了較強的優(yōu)勢。因此,如何在玻璃基底中直接生成半導體PbS納米晶體,作為量子點激光器和放大器增益介質(zhì)材料,從而構(gòu)成各類光通信器件,是今后新型光通信材料的一個研究熱點。 本文通過熔融法制備了玻璃基底的PbS納米晶體。采用X射線衍射儀(XRD)、高分辯透射電鏡(TEM)、近紅外吸收光譜儀等表征手段,檢測出熔融后緩慢降溫制備的玻璃基底PbS納米晶體的尺寸在6~10nm,但粒子間有團聚。研究了不同成分玻璃基底中生長PbS納米晶體的差異,討論了不同摻雜劑(PbO和S、PbS)和不同摻雜量對析出的納米晶體尺寸帶來的影響。本文首次在熔融后采用緩慢降溫,此方法比傳統(tǒng)熔融法更容易析出PbS納米晶體,但也存在一些缺點:納米晶體尺寸難以控制,納米粒子間有團聚現(xiàn)象和尺寸分布不均勻。
[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.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2010
【分類號】：TB383.1

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本文編號：2224157