半导体薄膜材料等离激元表面增强拉曼散射的研究

发布时间：2018-04-25 01:38

  本文选题：硫化镉 + 氧化铜　； 参考：《中国科学技术大学》2016年博士论文

【摘要】：表面增强拉曼散射(RRS和SERS)是非常有用的材料研究技术,但是由于对特定激发光波长以及实验上其他的特殊要求,实验上很难同时观测到这两种现象。在本研究中,我们通过在玻璃衬底上生长一层银等离子体纳米颗粒,并且在原位拉曼变温测量中改变硫化镉的禁带宽度,同时观测到了共振和表面增强拉曼散射。通过大幅增强拉曼散射强度,我们可以在热处理中实时原位观测硫化镉的物相变化,并且定量计算出硫化镉立方相所占六方相的比例。通过多种表征技术,我们研究了空气中退火对硫化镉性能的影响,并发现由于氧化作用,硫化镉薄膜的质量较低。由于大幅增强的纳米等离子体电场,我们观测到了拉曼多声子共振和与之相应的高阶散射模式。同时,我们也用傅立叶变换时域有限差分法(FTDT)对纳米银颗粒上生长硫化镉进行了表面散射增强计算,计算结果与实验结果一致。相比于氧化亚铜,氧化铜具有较低的禁带宽度,这使其在能源利用设备中更具应用前期。在本研究中,我们用磁控溅射方法在银纳米颗粒上生长一层氧化铜薄膜,并用变温表面增强拉曼研究其性能。通过大幅增强的表面纳米等离子体电场,成功地观测到氧化亚铜立方相并且在高温下的相变。利用不同的激发波长测量了室温下普通拉曼与增强拉曼光谱并进行了对比分析。只有632.8nm的激光能探测出生长在表面增强衬底上的氧化铜和氧化亚铜主拉曼振动模式。然而,XRD和XPS只能探测出氧化亚铜,因为在退火前后氧化亚铜是主要物相。
[Abstract]:Surface enhanced Raman scattering (RRS) and SERS (surface enhanced Raman scattering) are very useful materials research techniques. However, due to the special requirements of specific excited wavelength and other experimental requirements, it is difficult to observe these two phenomena simultaneously experimentally. In this study, a layer of silver plasma nanoparticles was grown on glass substrate, and the bandgap of cadmium sulfide was changed in situ Raman temperature measurements. Resonance and surface-enhanced Raman scattering were observed at the same time. By greatly increasing Raman scattering intensity, we can observe the phase change of cadmium sulfide in situ in real time during heat treatment, and calculate quantitatively the proportion of hexagonal phase in cubic phase of cadmium sulfide. The effects of annealing in air on the properties of cadmium sulfide were investigated by various characterization techniques. It was found that the quality of cadmium sulfide films was low due to oxidation. The Raman multiphonon resonance and the corresponding higher-order scattering modes have been observed due to the large enhancement of the nanoscale plasma electric field. At the same time, the surface scattering enhancement of cadmium sulfide grown on silver nanoparticles is calculated by Fourier transform finite-difference time-domain method (FTDTT). The calculated results are in agreement with the experimental results. Compared with cuprous oxide, copper oxide has lower band gap, which makes it more early applied in energy utilization equipment. In this study, a layer of copper oxide thin films was grown on silver nanoparticles by magnetron sputtering. The phase transition of cuprous oxide cubic phase at high temperature was observed successfully by a large enhanced surface nanoscale plasma electric field. Raman and enhanced Raman spectra were measured at room temperature with different excitation wavelengths. Only the laser of 632.8nm can detect the main Raman modes of copper oxide and cuprous oxide grown on the surface-enhanced substrates. However, XPS and XPS can only detect cuprous oxide, because cuprous oxide is the main phase before and after annealing.
【学位授予单位】：中国科学技术大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN304;O657.37
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本文编号：1799212