Plasmons in N-doped graphene nanostructures tuned by Au/Ag films: a time-dependent density functional theory study
Plasmons in N-doped graphene nanostructures tuned by Au/Ag films: a time-dependent density functional theory study
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由 Au/Ag 薄膜调节的 N 掺杂石墨烯纳米结构中的等离子体激元：时间相关的密度泛函理论研究
DOI：
10.1039/c7cp07507c
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发表时间：
2018
影响因子：
3.3
通讯作者：
Xinlu Cheng
中科院分区：
文献类型：
--
作者：
Xiaoqin Shu;Hong Zhang;Xinlu Cheng
氮掺杂石墨烯的吸收光谱的显著峰的能量共振点在紫外区。这限制了其作为助催化剂在可见光区通过光催化水裂解可再生氢析出中的应用。众所周知，贵金属薄膜在可见光区表现出活性吸收，这是由于存在被称为表面等离子体共振的独特特征。在这里，我们报告的可调等离子体在氮掺杂的石墨烯纳米结构使用贵金属（Au/Ag）薄膜。通过改变双层纳米结构的间距，改变了复合纳米结构的主峰的能量共振点。我们发现复合纳米结构的吸收光谱的强度比孤立的N掺杂石墨烯单层强得多。当分离间距减小时，吸收光谱的主峰向可见光区红移。此外，在N掺杂的石墨烯和Au膜复合纳米结构的表面上方存在几微安的电流。另外，当分离空间减小到3 μ m时，当脉冲激励在扶手椅边缘方向（X轴）上极化时，场增强超过1000，而当脉冲激励在扶手椅边缘方向（Y轴）上极化时，场增强接近100。N掺杂石墨烯与贵金属薄膜复合纳米结构是可见光区光催化分解水制氢的一种良好的助催化剂候选材料。
The energy resonance point of the prominent peak of the absorption spectrum of nitrogen-doped graphene is in the ultraviolet region. This limits its application as a co-catalyst in renewable hydrogen evolution through photocatalytic water splitting in the visible light region. It is well known that noble metal films show active absorption in the visible region due to the existence of the unique feature known as surface plasmon resonance. Here we report tunable plasmons in nitrogen-doped graphene nanostructures using noble metal (Au/Ag) films. The energy resonance point of the prominent peak of the composite nanostructure is altered by changing the separation space of two-layered nanostructures. We found the strength of the absorption spectrum of the composite nanostructure is much stronger than the isolated N-doped graphene monolayer. When the separation space is decreased, the prominent peak of the absorption spectrum is red-shifted to the visible light region. Moreover, currents of several microamperes exist above the surface of the N-doped graphene and Au film composite nanostructure. In addition, the field enhancement exceeds 1000 when an impulse excitation polarized in the armchair-edge direction (X-axis) when the separation space is decreased to 3 Å and is close to 100 when an impulse excitation polarized in the zigzag-edge direction (Y-axis). The N-doped graphene and noble metal film composite nanostructure is a good candidate material as a co-catalyst in renewable hydrogen production by photocatalytic water splitting in the visible light region.