Collective electronic excitations in the ultra violet regime in 2-D and 1-D carbon nanostructures achieved by the addition of foreign atoms.
Collective electronic excitations in the ultra violet regime in 2-D and 1-D carbon nanostructures achieved by the addition of foreign atoms.
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DOI：
10.1038/srep27090
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发表时间：
2016-06-07
影响因子：
4.6
通讯作者：
Gwilliam R
中科院分区：
文献类型：
--
作者：
Bangert U;Pierce W;Boothroyd C;Pan CT;Gwilliam R
等离子体在可见光/紫外线的能量制度已经引起了极大的关注，特别是在纳米材料，在光电子学和光收集方面的应用;定制增强等离子体是在纳米等离子体的前景特别感兴趣。这项工作表明，通过适当的掺杂，可以在纳米碳材料中产生可见光/紫外光范围内的激发，即，碳纳米管和石墨烯，选择合适的AD原子和掺杂剂，其通过低能离子注入直接引入晶格中或通过蒸发沉积添加。调查这些激励是否具有集体性质，即，具有等离子体特性，通过DFT计算和基于实验的介电函数提取进行。它们给出了一些引入的杂质物种，包括K，Ag，B，N和Pd的集体激发行为的证据。进一步证明了这种激发可以集中在纳米特征处，例如，沿着石墨烯中的纳米孔通过粘附到这些孔的边缘的金属原子。
Plasmons in the visible/UV energy regime have attracted great attention, especially in nano-materials, with regards to applications in opto-electronics and light harvesting; tailored enhancement of such plasmons is of particular interest for prospects in nano-plasmonics. This work demonstrates that it is possible, by adequate doping, to create excitations in the visible/UV regime in nano-carbon materials, i.e., carbon nanotubes and graphene, with choice of suitable ad-atoms and dopants, which are introduced directly into the lattice by low energy ion implantation or added via deposition by evaporation. Investigations as to whether these excitations are of collective nature, i.e., have plasmonic character, are carried out via DFT calculations and experiment-based extraction of the dielectric function. They give evidence of collective excitation behaviour for a number of the introduced impurity species, including K, Ag, B, N, and Pd. It is furthermore demonstrated that such excitations can be concentrated at nano-features, e.g., along nano-holes in graphene through metal atoms adhering to the edges of these holes.