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首页> 外文期刊>Applied Surface Science >Physical insight in the fluence-dependent distributions of Au nanoparticles produced by sub-picosecond UV pulsed laser ablation of a solid target in vacuum environment
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Physical insight in the fluence-dependent distributions of Au nanoparticles produced by sub-picosecond UV pulsed laser ablation of a solid target in vacuum environment

机译：在真空环境中的固体靶标产生的Au纳米颗粒的流量依赖性分布的物理洞察

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摘要

Deposition of Au nanoparticles (NPs) through UV ultra-short-pulse laser ablation in vacuum is a methodology suitable for obtaining high purity supported plasmonic NPs with a superb adherence to both planar and patterned substrates. Furthermore, the peculiarity that upon sub-picosecond laser irradiation NPs form directly within the target leads to narrow and controlled size-distribution. While extensive literature theoretically models phase changes and pressure relaxation of metal targets under sub-picosecond irradiation, the evolution of the nanostructured deposit through different ablation regimes is poorly documented experimentally.In this paper, besides modeling the temporal evolution of electron and lattice temperature following sub-picosecond laser pulse irradiation of Au bulk at the threshold ablation fluence (0.1 J/cm(2)), we report an accurate statistical, morphological and structural characterization of the AuNP distributions as a function of the laser fluence tuned from 0.1 to 3 J/cm(2) to drive the target through two ablation regimes. The occurrence of photomechanical spallation and phase explosion at low and high fluence, respectively, is correlated with the evolution of the NP deposits, which are discussed by providing a physical insight in the interplay between fluence-driven ablation regimes of the target, arrangement kinetics of the deposited species (NPs and vapour species) and (crystalline or amorphous) phase of the NPs. This knowledge is key for controlling the surface plasmon resonance response of AuNPs depending on the designed application.
机译：Au纳米颗粒（NPS）通过UV超短脉冲激光消融真空沉积是一种适于获得高纯度负载的等离子体NPS的方法，其具有卓越的粘附到平面和图案化基板。此外，在亚皮秒激光照射NPS形成直接在目标内的特殊性导致窄和控制的尺寸分布。虽然广泛的文学理论上模型在亚微微秒照射下的金属目标的相变和压力松弛，但通过不同消融制度的纳米结构沉积物的演变是实验记录的。在本文之外，除了模拟电子和晶格温度之后的次数-Picosecond激光脉冲照射Au批量的阈值消融注释（0.1J / cm（2）），我们报告了AUNP分布的准确统计，形态学和结构表征，因为激光器流量从0.1到3 J调谐/ cm（2）通过两个消融制度驱动目标。分别在低和高流量下发生光学机械剥落和相爆爆，与NP沉积物的演进相关，这是通过在靶的流量驱动的消融制度之间的相互作用中提供物理洞察来讨论NPS的沉积物种（NPS和蒸汽物种）和（结晶或无定形）相。根据设计的应用，这种知识是控制AUNP的表面等离子体共振响应的关键。

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  • 来源
    《Applied Surface Science》 |2019年第30期|330-340|共11页
  • 作者

    Cesaria M.; Caricato A. P.; Beccaria M.; Perrone A.; Martino M.; Taurino A.; Catalano M.; Resta V; Klini A.; Gontad F.;

  • 作者单位

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy|CNR IMM Via Monteroni I-73100 Lecce Italy;

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy;

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy;

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy;

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy;

    CNR IMM Via Monteroni I-73100 Lecce Italy;

    CNR IMM Via Monteroni I-73100 Lecce Italy;

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy;

    Fdn Res & Technol Hellas FORTH IESL 100 N Plastira St GR-71110 Iraklion Crete Greece;

    Univ Salento Dept Math & Phys Ennio De Giorgi Via Arnesano I-73100 Lecce Italy;

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