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首页> 外文期刊>Nanotechnology >Ligand-free attachment of plasmonic Au nanoparticles on ZnO nanowire to make a high-performance broadband photodetector using a laser-based method
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Ligand-free attachment of plasmonic Au nanoparticles on ZnO nanowire to make a high-performance broadband photodetector using a laser-based method

机译：ZnO纳米线上具有基质Au纳米粒子的配体附着，采用基于激光的方法制备高性能宽带光电探测器

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摘要

We report a new strategy for ligand-free attachment of plasmonic Au nanoparticles on the surface of a ZnO nanowire to make high-performance broadband photodetectors using a pulsed laser ablation technique in a liquid medium. The photoresponse of the ZnO-based photodetector is enhanced and the photodetection limit is broadened from UV to visible, which can be controlled by varying the concentration of Au nanoparticles attached to the ZnO surface. This Au nanoparticle. concentration can be tuned by varying the number of laser pulses used in the ablation process. We found that the responsivity of the detector is 10 mAW(-1) for lambda similar to 525 nm and increases to as much as 0.4 A W-1 for lambda <= 400 nm for the maximum Au concentration. The enhanced responsivity was found to be linked to increased absorption over a broad spectral range arising from direct and indirect plasmonic processes due to Au nanoparticle attachment, and the enhanced absorption also leads to a large increment in photocurrent generation. We also found that the attachment of Au nanoparticles makes the relaxation of the photocurrent (persistence) considerably faster in both the UV and visible regions of the spectrum and that the persistence directly depends on the concentration of Au nanoparticles attached to the ZnO nanowire. This single-step pulsed laser ablation-based nanoparticle attachment process can be further used to make other plasmonic nanoparticle-decorated nanowire devices.
机译：我们在ZnO纳米线表面上报告了自由配体Au纳米颗粒的可自由配合附着的新策略，以制备高性能宽带光电探测器在液体介质中使用脉冲激光烧蚀技术。增强了ZnO的光电探测器的光响应，并从UV扩大了光电检测到可见，这可以通过改变附着到ZnO表面的Au纳米颗粒的浓度来控制。这种Au纳米粒子。可以通过改变消融过程中使用的激光脉冲的数量来调谐浓度。我们发现检测器的响应性为Lambda的λ为10毫安（-1），类似于525nm，对于Lambda <= 400nm的λ<= 400nm，对于最大Au浓度，增加到0.4aW-1。发现增强的响应率与由于Au纳米粒子附着引起的直接和间接等离子体过程产生的宽光谱范围内的增加，并且增强的吸收也导致光电流产生的大量增量。我们还发现Au纳米颗粒的附着在光谱的UV和可见区域中的光电流（持久性）的放松显着更快，并且持久性直接取决于连接到ZnO纳米线的Au纳米颗粒的浓度。基于单步脉冲激光烧蚀的纳米颗粒附着方法可以进一步用于制造其他等离子体纳米颗粒装饰的纳米线装置。

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