Asymmetries in the Electronic Properties of Spheroidal Metallic Nanoparticles, Revealed by Conduction Electron Spin Resonance and Surface Plasmon Resonance
Asymmetries in the Electronic Properties of Spheroidal Metallic Nanoparticles, Revealed by Conduction Electron Spin Resonance and Surface Plasmon Resonance
复制标题
传导电子自旋共振和表面等离子共振揭示球形金属纳米颗粒电子性质的不对称性
DOI：
10.1021/acsnano.0c08515
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发表时间：
2021
期刊：
影响因子：
17.1
通讯作者：
Lear, Benjamin J.
中科院分区：
文献类型：
--
作者：
Cruz, Santina S.;Tanygin, Vadim;Lear, Benjamin J.
利用电子自旋共振光谱，我们证明了小球状金属纳米颗粒中存在的形态不对称性导致了处于金属费米能量附近状态的电子行为的不对称性。我们发现，在解释电子行为的不对称性时，形态不对称性对这些球体系统的影响比尺寸分布的影响更重要。这对所有被检测的颗粒都是正确的，这些颗粒是由铜、银、钯、铱、铂和金制成的，带有十二烷硫化物配体。在银粒子的情况下，我们还证明了用于解释电子自旋共振谱中形态效应的相同模型可以用于解释等离子体谱中存在的小不对称性。这一结果表明，即使是小颗粒的电子性质也是可调的。
Using electron spin resonance spectroscopy, we demonstrate that the morphological asymmetries present in small spheroidal metallic nanoparticles give rise to asymmetries in the behavior of electrons held in states near the metal’s Fermi energy. We find that the effects of morphological asymmetries for these spheroidal systems are more important than the effects of size distributions when explaining the asymmetry in electronic behavior. This is found to be true for all the particles examined, which were made from Cu, Ag, Pd, Ir, Pt, and Au, bearing dodecanethiolate ligands. In the case of the Ag particles, we also demonstrate that the same model used to account for morphological effects in the electron spin resonance spectra can be used to account for small asymmetries present in the plasmon spectrum. This result demonstrates that the electronic properties of even small particles are tunableviamorphological changes.