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Laser tailored nanoparticle arrays to detect molecules at dilute concentration

机译：激光定制的纳米颗粒阵列可检测低浓度的分子

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By nanosecond pulsed laser ablation in an ambient gas gold nanoparticles (NPs) were produced that self assemble on a substrate resulting in increasingly elaborated architectures of growing thickness, from isolated NP arrays up to percolated films. NPs nucleate and grow in the plasma plume propagating through the gas. Process parameters including laser wavelength, laser energy density, target to substrate distance, nature and pressure of the gas affect plasma expansion, thus asymptotic NP size and kinetic energy. NP size, energy and mobility at landing determine film growth and morphology that affect the physicochemical properties of the film. Keeping fixed the other process parameters, we discuss the sensitive dependence of film surface nanostructure on Ar pressure and on laser pulse number. The initial plume velocity and average ablated mass per pulse allow predicting the asymptotic NP size. The control of growth parameters favors fine-tuning of NP aggregation, relevant to plasmonics to get optimized substrates for surface enhanced Raman spectroscopy (SERS). Their behavior is discussed for testing conditions of interest for clinical application. Both in aqueous and in biological solutions we obtained good sensitivity and reproducibility of the SERS signals for the anti-Parkinson drug apomorphine, and for the anti-epilepsy drug carbamazepine. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过在环境气体中进行纳秒脉冲激光烧蚀，制得了金纳米颗粒（NPs），该纳米颗粒自组装在基底上，导致从隔离的NP阵列到渗透膜的越来越精细的厚度不断增加的体系结构。 NP在通过气体传播的等离子体羽中成核并生长。工艺参数包括激光波长，激光能量密度，目标与基板的距离，气体的性质和压力会影响等离子体膨胀，从而影响渐近NP尺寸和动能。纳米粒子的大小，着陆时的能量和迁移率决定了影响薄膜物理化学性质的薄膜生长和形态。保持其他工艺参数不变，我们讨论薄膜表面纳米结构对Ar压力和激光脉冲数的敏感依赖性。初始羽流速度和每个脉冲的平均烧蚀质量可以预测渐近NP的大小。生长参数的控制有利于NP聚集的微调，这与等离激元有关，以获得用于表面增强拉曼光谱（SERS）的优化底物。讨论了它们的行为以测试临床应用中感兴趣的条件。在水溶液和生物溶液中，我们都获得了针对抗帕金森药物阿扑吗啡和抗癫痫药卡马西平的SERS信号的良好灵敏度和可重复性。 （C）2016 Elsevier B.V.保留所有权利。

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