This study focuses on metal/polymer nanocomposite thin films made by atmospheric pressure Plasma-Enhanced Chemical Vapor Deposition. The aerosol of isopropanol-dissolved tetrachloroauric acid (HAuCl₄:3H₂O gold salt) is injected in a dielectric barrier discharge to synthesize plasmonic nanocomposite thin films. Argon is used as carrier gas with or without 133 ppm addition of ammonia (NH₃) to respectively get or not a Penning mixture. Results show that NH₃ largely influences the salt reduction and thin film properties. According to the aerosol characterization, the size distribution at the plasma entrance supports that isopropanol mainly evaporates before injection in the plasma. The salt initially dissolved in each droplet precipitates during evaporation before injection as solid nanoparticles of about 30 nm diameter with eventual traces of solvent. Then, the nanocomposite thins film are studied. Optical properties, as plasmonic resonance, are characterized by UV–visible absorption spectroscopy. The chemical composition is analyzed using X-ray photoelectron spectroscopy and Raman spectroscopy, complemented by X-ray diffraction analysis as well as chemical mapping obtained by Energy dispersive spectroscopy coupled to scanning electron microscopy (SEM) operating in Scanning Transmission Electron Microscopy mode. Additionally, the morphology of the deposits is investigated by atomic force microscopy and SEM, highlighting the influence of NH₃ gas on the film nature and therefore its role in the overall deposition process. Finally, optical emission spectroscopy of the plasma gives clue to better understand the effect of NH₃. The overall results show that the salt nanoparticles are reduced in the plasma phase leading to non-aggregated metal Au NPs embedded in a carbon-based matrix formed by isopropanol polymerization. The presence of NH₃ in the plasma unambiguously decreases the salt reduction and affects the thin film properties, consequently changing their plasmonic response related to the size, concentration, and composition of the embedded NPs.

本研究重点研究通过大气压等离子体增强化学气相沉积制备的金属/聚合物纳米复合薄膜。将异丙醇溶解的四氯金酸（HAuCl ₄ :3H ₂ O金盐）的气溶胶注入介质阻挡放电中以合成等离子体纳米复合薄膜。使用氩气作为载气，添加或不添加133 ppm氨(NH ₃ )，分别得到或不得到潘宁混合物。结果表明NH ₃对盐还原和薄膜性能影响很大。根据气溶胶表征，等离子体入口处的尺寸分布支持异丙醇主要在注入等离子体之前蒸发。最初溶解在每个液滴中的盐在注入之前在蒸发过程中沉淀为直径约 30 nm 的固体纳米颗粒，最终含有痕量溶剂。然后，对纳米复合薄膜进行了研究。等离激元共振等光学特性可通过紫外-可见吸收光谱来表征。使用 X 射线光电子能谱和拉曼光谱分析化学成分，并辅以 X 射线衍射分析以及通过能量色散谱与扫描电子显微镜 (SEM) 模式下操作的扫描电子显微镜 (SEM) 结合获得的化学图谱。_{此外，通过原子力显微镜和 SEM 研究了沉积物的形态，突出了 NH 3}气体对薄膜性质的影响及其在整个沉积过程中的作用。最后，等离子体的光学发射光谱为更好地了解 NH ₃的影响提供了线索。总体结果表明，盐纳米颗粒在等离子体相中被还原，导致非聚集的金属金纳米颗粒嵌入通过异丙醇聚合形成的碳基基质中。_{等离子体中NH 3}的存在无疑会降低盐还原并影响薄膜特性，从而改变与嵌入纳米颗粒的尺寸、浓度和组成相关的等离子体响应。