Highly Controllable Surface Plasmon Resonance Property by Heights of Ordered Nanoparticle Arrays Fabricated via a Nonlithographic Route.
Highly Controllable Surface Plasmon Resonance Property by Heights of Ordered Nanoparticle Arrays Fabricated via a Nonlithographic Route.
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DOI：
10.1021/acsnano.5b01226
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发表时间：
2015-03
期刊：
影响因子：
17.1
通讯作者：
Zhibing Zhan;Rui Xu;Y. Mi;Huaping Zhao;Y. Lei
中科院分区：
文献类型：
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作者：
Zhibing Zhan;Rui Xu;Y. Mi;Huaping Zhao;Y. Lei
完美有序的纳米颗粒阵列通过成本效益高的非光刻工艺在大面积衬底（>cm(2)）上制造。由于这些等离子体金属纳米粒子（银和金）的形状相同，尺寸和距离均匀，因此不同的表面等离子体共振（SPR）模式聚焦在各自的位置上。在此基础上，结合时域有限差分（FDTD）仿真，揭示了纳米粒子高度对所有SPR参数（位置、强度、宽度和模态）的影响，表明高度在不同阶段的影响是不同的。随着高度的增加，主偶极子SPR模式精确地从近红外区域蓝移到可见光区域，强度增强，峰窄效应，并且在紫外-可见范围内激发多极子模式。多极模的强度可以被控制为等于甚至大于主偶极SPR模。通过原子层沉积在这些纳米粒子阵列上涂覆保形TiO2壳层后，随着高度的增加，SPR模式的增强导致该等离子体-金属-半导体结合体系的光电流倍增（从~ 2.5到最大90 μA cm(-2)）。这种简单而有效的调整所有SPR参数的方法为未来等离子体金属纳米结构的设计提供了指导，这对SPR的应用具有重要意义。
Perfectly ordered nanoparticle arrays are fabricated on large-area substrates (>cm(2)) via a cost-effective nonlithographic route. Different surface plasmon resonance (SPR) modes focus consequently on their own positions due to the identical shape and uniform size and distance of these plasmonic metallic nanoparticles (Ag and Au). On the basis of this and FDTD (finite-difference time-domain) simulation, this work reveals the variation of all SPR parameters (position, intensity, width, and mode) with nanoparticle heights, which demonstrates that the effect of heights are different in various stages. On increasing the heights, the major dipole SPR mode precisely blue-shifts from the near-infrared to the visible region with intensity strengthening, a peak narrowing effect, and multipole modes excitation in the UV-vis range. The intensity of multipole modes can be manipulated to be equal to or even greater than the major dipole SPR mode. After coating conformal TiO2 shells on these nanoparticle arrays by atomic layer deposition, the strengthening of the SPR modes with increasing the heights results in the multiplying of the photocurrent (from ∼2.5 to a maximum 90 μA cm(-2)) in this plasmonic-metal-semiconductor-incorporated system. This simple but effective adjustment for all SPR parameters provides guidance for the future design of plasmonic metallic nanostructures, which is significant for SPR applications.