高熵合金的纳米尺度表面分析
Nanoscale Surface Analysis of High Entropy Alloy
AI总结：
利用纳米红外光谱技术对1微米厚高熵合金进行纳米级表面分析，发现其在900-1100 cm⁻¹波段的吸收和反射增强，与Drude-Lorenz模型一致，但可能由氧化物形成所致，同时探讨了极化分析在纳米红外光谱中的应用。
摘要：
采用纳米红外光谱技术对1微米厚的高熵合金（HEAs）进行了纳米级表面分析，利用超光谱成像和单点光谱在700-1700 cm⁻¹波段进行检测。纳米红外光谱基于傅里叶变换红外光谱仪一臂中振荡金属涂层纳米尖端散射光的检测，其分辨率由探针尖端半径定义，为20纳米，与激发波长无关。HEA CuPdAgPtAu在900-1100 cm⁻¹波段显示出吸收和反射的增加，这与介电常数的Drude-Lorenz建模一致，但也可通过X射线光电子能谱（XPS）测试CuPdAgPtAu和CrFeCoNiCuMo的氧化物形成来验证。讨论并建模了纳米红外纳米光谱在样品表面法线平面内的极化分析实现。目前可用的表面分析模式，即p-极化天线的激发-检测模式，可以扩展到对局部吸收率和折射率的各向异性依赖性的全3D分析。
英文摘要：
Nanoscale surface analysis of 1 micrometer thick high entropy alloys (HEAs) was carried out using nano-IR for hyperspectral imaging and single point spectroscopy in the 700-1700 1/cm spectral range. Nano-IR is based on the detection of scattered light from an oscillating metal coated nano-tip in one of the arms of the Fourier transform infrared spectrometer and has a resolution defined by the tip radius of the probe, 20 nm, regardless of the excitation wavelength. HEA CuPdAgPtAu showed an absorption and reflection increase at 900-1100 1/cm band, which is consistent with Drude-Lorenz modeling of permittivity, however, could also signify oxide formation as tested by X-ray photoelectron spectroscopy of CuPdAgPtAu and CrFeCoNiCuMo. Realization of polarization analysis for nano-IR nano-spectroscopy in the plane perpendicular to the sample's surface is discussed and modeled. The currently available modality of surface analysis with the excitation-detection mode of the p-pol. antenna can be extended to full 3D analysis of the orientational dependencies of local absorbance and refractive index.
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