Hexagonal Boron Nitride As an Ideal Substrate for Carbon Nanotube Photonics
Hexagonal Boron Nitride As an Ideal Substrate for Carbon Nanotube Photonics
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六方氮化硼作为碳纳米管光子学理想衬底的研究
DOI：
10.1021/acsphotonics.0c00406
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发表时间：
2020-07-15
期刊：
影响因子：
7
通讯作者：
Kato, Y. K.
中科院分区：
文献类型：
--
作者：
Fang, N.;Otsuka, K.;Kato, Y. K.
六方氮化硼被广泛用作电子和光子器件中二维材料的衬底。在这里，我们证明了二维六方氮化硼也是一维单壁碳纳米管的理想衬底。直接附着在六方氮化硼上的纳米管在室温下表现出明亮的光致发光，具有窄线宽，可与空气悬浮的纳米管相媲美。使用光致发光激发光谱，我们明确地分配氮化硼纳米管的手性通过跟踪单个管之前和之后与氮化硼接触。虽然六方氮化硼具有低的介电常数，并且仅附着在纳米管的一侧，但我们观察到，光学跃迁能量从空气悬浮纳米管红移到50 meV。我们还对400多个管进行了统计测量，发现红移与管直径有关。这项工作开辟了新的可能性，全固态碳纳米管光子器件利用六方氮化硼衬底。
Hexagonal boron nitride is widely used as a substrate for two-dimensional materials in both electronic and photonic devices. Here, we demonstrate that two-dimensional hexagonal boron nitride is also an ideal substrate for one-dimensional single-walled carbon nanotubes. Nanotubes directly attached to hexagonal boron nitride show bright photoluminescence with narrow line width at room temperature, comparable to air-suspended nanotubes. Using photoluminescence excitation spectroscopy, we unambiguously assign the chiralities of nanotubes on boron nitride by tracking individual tubes before and after contact with boron nitride. Although hexagonal boron nitride has a low dielectric constant and is attached to only one side of the nanotubes, we observe that optical transition energies are red shifted as much as similar to 50 meV from the air-suspended nanotubes. We also perform statistical measurements on more than 400 tubes, and the red-shifts are found to be dependent on tube diameter. This work opens up new possibilities for all-solid-state carbon nanotube photonic devices by utilizing hexagonal boron nitride substrates.