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采用脉冲激光气相沉积技术,将Ni纳米颗粒嵌埋在MgO薄膜中,形成Ni∶MgO纳米复合薄膜(Ni NCs∶MgO)。分别采用高分辨X射线衍射技术和紫外-可见吸收光谱详细研究了薄膜的晶体结构及光学性质。HRXRD结果表明MgO薄膜和Ni纳米颗粒都沿着(200)方向生长;由于Ni纳米颗粒的嵌埋,导致MgO基质发生了晶格畸变,从而使得MgO基质的晶格常数发生改变;晶格畸变也导致MgO的衍射峰被展宽;Ni的含量与其颗粒尺寸随着沉积Ni的激光脉冲数的增加而增加。紫外-可见吸收光谱的分析结果表明在190～600nm波长范围内薄膜的吸收峰是Ni纳米颗粒的表面等离激元共振吸收峰;随着沉积Ni激光脉冲数的增加,单个吸收峰强度增强的同时还发生了红移;当沉积Ni的激光脉冲数从200增加到250时,吸收峰发生劈裂。
Ni nanoparticles were embedded in MgO thin films by pulsed laser vapor deposition to form Ni:MgO nanocomposite films (Ni NCs: MgO). The crystal structure and optical properties of the films were investigated in detail using high-resolution X-ray diffraction and UV-Vis absorption spectra. HRXRD results show that both MgO films and Ni nanoparticles grow along the (200) direction. Due to the embedded Ni nanoparticles, the lattice distortion of the MgO matrix occurs and the lattice constant of the MgO matrix changes. The lattice distortion Resulting in the broadening of the diffraction peak of MgO; the content of Ni and its particle size increase with the increase of laser pulse number of Ni deposition. The results of UV-vis absorption spectra show that the absorption peak of the film is the surface plasmon resonance absorption peak of Ni nanoparticles in the wavelength range of 190-600 nm. With the increase of the number of Ni laser pulses, the intensity of single absorption peak increases At the same time, a red shift occurred. When the number of laser pulses deposited Ni increased from 200 to 250, the absorption peak was split.