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Precipitation of Pt Nanoparticles inside Ion-Track-Etched Capillaries

机译：离子轨道蚀刻毛细管内Pt纳米粒子的沉淀

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Ion-track-etched capillaries containing nanoparticles of precious metals (e.g., Pt, Au, and Ag) can be applied to plasmonic absorber materials. The precipitation of homogeneous and highly dispersed precious metal nanoparticles inside capillaries represents a key process. Ion-track-etched capillaries (diameter: ~500 nm, length: ~25 μm) were created in polyimide film by 350 MeV Xe irradiation (3 × 107 ions/cm2) and chemical etching (using a sodium hypochlorite solution). The films with capillaries were immersed in an aqueous solution containing 0.1–10 mmol/L H2PtCl6 and 0.5 vol% C2H5OH, and then irradiated with a 2 MeV electron beam up to a fluence of 1.4 × 1016 e/cm2. The Pt particles inside the capillaries were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The precipitation of Pt nanoparticles and isolated aggregates inside the capillaries was confirmed by TEM. The Pt nanoparticles tended to aggregate under increasing concentrations of H2PtCl6 in the aqueous solution; meanwhile, no changes in nanoparticle size were noted under increasing electron beam fluence. The results suggest that the proposed method can be used to form metal nanoparticles in nanosized capillaries with a high aspect ratio.
机译：含有贵金属纳米颗粒（例如，Pt，Au和Ag）的离子轨道蚀刻毛细管可应用于等离子体吸收材料。毛细血管内均匀和高度分散的贵金属纳米粒子的沉淀代表了一个关键方法。在聚酰亚胺膜中产生离子轨道蚀刻毛细血管（直径：〜500nm，长度：〜25μm），通过350mev xe照射（3×107离子/ cm 2）和化学蚀刻（使用次氯酸钠溶液）。将具有毛细血管的薄膜浸入含0.1-10mmol / L H2PTCl6和0.5Vol％C 2 HOH的水溶液中，然后用2meV电子束照射，直至1.4×1016 E / cm2的流量。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM），表征毛细血管内的Pt颗粒。通过TEM确认Pt纳米颗粒和毛细血管内分离的聚集体的沉淀。 Pt纳米颗粒在水溶液中的增加的H2PTCl6浓度下倾向于聚集;同时，在增加的电子束注释下没有纳米颗粒尺寸的变化。结果表明，该方法可用于形成具有高纵横比的纳米毛细血管中的金属纳米颗粒。

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