Al nanocrystals can be synthesized by high-temperature decomposition of triisobutyl aluminum, creating a mixture of nanoparticle geometries with a significant fraction (∼15%) being single-crystalline Al nanorods. The Al nanorods are elongated along their ⟨110⟩ direction, and generally exhibit hexagonal cross sections consisting of two adjacent {111} facets separated by {100} facets on opposite sides. Dark-field scattering spectroscopy of individual Al nanorods reveals that rods of varying aspect ratios all possess transverse quadrupolar and octupolar modes in the visible (2–3 eV) and ultraviolet (3–5 eV) regimes. Theoretical modeling indicates that the longitudinal resonances of these nanorods span the near- and mid-infrared regions of the spectrum. This work introduces a new class of anisotropic metal nanocrystals composed of single-crystalline Al, opening the door to highly modifiable plasmonic nanorods from Earth-abundant metals.

中文翻译：

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铝纳米棒

可以通过三异丁基铝的高温分解来合成Al纳米晶体，从而形成纳米颗粒几何形状的混合物，其中很大一部分（约15％）是单晶Al纳米棒。Al纳米棒沿它们的⟨110⟩方向伸长，并且通常显示出六角形横截面，该横截面由在相对侧上由{100}小平面隔开的两个相邻的{111}小平面组成。单个Al纳米棒的暗场散射光谱显示，纵横比不同的棒在可见光（2-3 eV）和紫外光（3-5 eV）情况下均具有横向四极和八极模式。理论模型表明，这些纳米棒的纵向共振跨越了光谱的近红外和中红外区域。