2 research outputs found
GAN_(1-x)P_x三元合金的MOCVD生长
用金属有机化学气相淀积技术在蓝宝石衬底上成功外延了高P组分的GaN_(1-x)P_x 三元合金。俄歇电子能谱深度剖面结果表明在GaN_(1-x)P_x 中P的掺入量最高达到20%且分布均匀;X射线光电子能谱价态分析证实了外延层中Ga-P键的存在。对不同P组分的GaN_(1-x)P_x 样品进行了低温光致发光(PL)测试,与来自GaN衬底的带边发射相比,随三元合金中P组分的变化,GaN_(1-x)P_x 的PL峰呈现出了不同程度的红移。在GaN_(1-x)P_x 的PL谱中没有观测到有关GaP的发射峰,表明该合金材料没有发生相分离
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Significant broadband extinction abilities of bioaerosols
Bioaerosol, an important constituent of the atmosphere, can directly affect light radiation characteristics due to absorption and scattering effects. Current research lacks a reasonable explanation for the extinction abilities of bioaerosols in a broadband. Herein, we measured the reflectance spectra of 12 common biomaterials and calculated their complex refractive indexes. The peaks of the imaginary part of the complex refractive indexes are located at wavelengths of approximately 0.7, 2.7, 6.1 and 9.5 μm. Based on photographs of the floating structures of bioaerosols, we constructed a model for calculating the extinction abilities of bioaerosols in the wavelength range of 240 nm to 14 μm. Taking AN02 spores as an example, absorption was found to account for more than 90% of the total extinction. In addition, the theoretical calculations and experimental data of transmittance corresponding to the smoke box show that bioaerosol exhibits significant broadband extinction ability from UV to IR bands, which provides new directions for the development of broadband light attenuation materials.生物气溶胶是大气的重要组成部分, 因其吸收和散射效应, 可直接影响光辐射特性. 当前对于生物气溶胶是否具有宽波段消光特性 的研究还不够充分. 本文中, 我们测量了12种常见生物材料在240 nm–14 μm波段内的反射光谱, 并结合K-K算法计算了不同生物气溶胶材 料的复折射率. 我们发现, 不同种质生物气溶胶的吸收峰具有共性, 位于约0.7, 2.7, 6.1和9.5 μm处. 基于烟幕箱中生物气溶胶漂浮状态实际 结构的照片, 我们构建了模型计算240 nm–14 μm波长范围内生物气溶胶的消光能力. 以AN02孢子为例, 我们发现吸收作用占AN02孢子群 消光总量的90%以上. 此外, 我们对比了生物气溶胶理论计算透过率与大型烟幕箱实测透射率数据, 理论计算和实验验证都显示生物气溶 胶在紫外到红外波段具有显著的宽波段消光能力. 这一发现为宽波段消光材料的发展提供了新的研究方向