The localized plasmon resonance enhancement mechanisms were investigated as a function to increase the shell thickness of the prepared hexagonal nanodiscs arrays of Au@TiO₂ core‐shell. The bare Au hexagonal nanodiscs array exhibited multiple plasmon resonance modes in the ultraviolet (UV) to near‐infrared (NIR) region. Au@TiO₂ nanodiscs configuration present three different enhancement mechanisms with increasing TiO₂ shell thickness. First, a strengthened plasmon‐induced resonance energy transfer (PIRET) for higher plasmonic resonance mode in the UV region. Second, redshifted and broadened direct electron transfer (DET) processes for the plasmonic dipole resonance mode from the Vis to the NIR region. Third, an increased hybridization retardation effect for the higher plasmonic mode in the Vis region. By using a facile and cost‐effective technique (nonlithographic route) to fabricate highly ordered core‐shell nanodiscs arrays (Au@TiO₂ hexagonal nanodiscs) on a large area of Si substrate (>cm²) via an ultrathin alumina membrane (UTAM), this technique provides a perfect shadow mask to fabricate Au nanodiscs arrays; furthermore, the shadow effect of UTAM pores offers enough space to cover Au nanodiscs by the TiO₂. These plasmonic core‐shell nanodiscs reveal a highly promising pathway to discovering new enhancement phenomena that can be applied in diverse applications such as plasmon‐enhanced energy conversion, biosensing, and surface‐enhanced vibrational spectroscopy.

中文翻译：

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基于模板的Au @ TiO2纳米圆盘的等离子体增强机理

研究了局部等离子体激元共振增强机制，以增加所制备的Au @ TiO ₂核壳六角形纳米盘阵列的壳厚度。裸金六边形纳米圆片阵列在紫外（UV）到近红外（NIR）区域显示出多种等离子体共振模式。随着TiO ₂含量的增加，Au @ TiO ₂纳米盘的结构呈现出三种不同的增强机理外壳厚度。首先，为了在紫外线区域中实现更高的等离子体共振模式，加强了等离子体激发共振能量转移（PIRET）。其次，等离激元偶极子共振模式从Vis到NIR区域的红移和加宽直接电子转移（DET）过程。第三，对于Vis区域中的更高等离激元模式，增加的杂交阻滞作用增加。通过使用便捷且经济高效的技术（非光刻工艺）在大面积Si衬底（> cm ²）上制造高度有序的核壳纳米圆盘阵列（Au @ TiO ₂六角形纳米圆盘））通过超薄氧化铝膜（UTAM），该技术为制造金纳米盘阵列提供了理想的荫罩；此外，UTAM孔的阴影效应提供了足够的空间以通过TiO ₂覆盖Au纳米圆盘。这些等离激元核壳纳米光盘揭示了发现新增强现象的极有前途的途径，这些新现象可用于等离激元增强的能量转换，生物传感和表面增强的振动光谱等多种应用。