通过液体中的laser烧蚀产生的Au装饰黑色TiO $_2$
Au-decorated black TiO$_2$ produced via laser ablation in liquid
摘要：
在独特的混合纳米材料中等离子体和全介电概念的合理组合为具有最终性能和扩展模式的设备提供了有希望的途径。然而，这种纳米结构的等离子体和米氏型共振的光谱匹配只能针对它们不同的特征尺寸来实现，因此使得所得的混合纳米结构几何形状对于实际实现和大规模复制来说是复杂的。在这里，我们通过单步纳秒激光烧蚀分散在HAuCl $_4$水溶液中的市售TiO $_2$纳米粉末，同时制备了独特的无定形TiO $_2$纳米球，并用Au纳米团簇进行装饰和掺杂。所制造的混合物表现出显着的光吸收性能（平均值$\approx$ 96%），在可见光和近红外光谱范围内介导的带隙减少的激光处理的非晶TiO $_2$，以及装饰金纳米团簇的等离子体共振，这是通过结合光学光谱，先进的电子能量损失谱，透射电子显微镜和电磁建模证实。所产生的混合物的优良的光吸收和等离子体特性的实施，以证明催化被动的SERS生物传感器，用于识别痕量浓度的分析物和太阳能蒸汽发生器，允许增加水蒸发速率的2.5倍，与纯水相比，在相同的一个太阳照射条件下。
英文摘要：
Rational combination of plasmonic and all-dielectric concepts within unique hybrid nanomaterials provides promising route toward devices with ultimate performance and extended modalities. However, spectral matching of plasmonic and Mie-type resonances for such nanostructures can only be achieved for their dissimilar characteristic sizes, thus making the resulting hybrid nanostructure geometry complex for practical realization and large-scale replication. Here, we produced unique amorphous TiO$_2$ nanospheres simultaneously decorated and doped with Au nanoclusters via single-step nanosecond-laser ablation of commercially available TiO$_2$ nanopowders dispersed in aqueous HAuCl$_4$. The fabricated hybrids demonstrate remarkable light-absorbing properties (averaged value $\approx$ 96%) in the visible and near-IR spectral range mediated by bandgap reduction of the laser-processed amorphous TiO$_2$, as well as plasmon resonances of the decorating Au nanoclusters, which was confirmed by combining optical spectroscopy, advanced electron energy loss spectroscopy, transmission electron microscopy and electromagnetic modeling. Excellent light-absorbing and plasmonic properties of the produced hybrids were implemented to demonstrate catalytically passive SERS biosensor for identification of analytes at trace concentrations and solar steam generator that permitted to increase water evaporation rate by 2.5 times compared with that of pure water under identical one-sun irradiation conditions.
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