单壁碳纳米管内纳米级镍簇的近场红外显微镜观察

Near-field infrared microscopy of nanometer-sized nickel clusters inside single-walled carbon nanotubes.

作者信息

Németh Gergely, Datz Dániel, Pekker Áron, Saito Takeshi, Domanov Oleg, Shiozawa Hidetsugu, Lenk Sándor, Pécz Béla, Koppa Pál, Kamarás Katalin

机构信息

Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences Konkoly-Thege M. u. 29-33 H-1121 Budapest Hungary

Nanomaterials Research Institute, AIST 1-1-1 Higashi Tsukuba 305-8565 Japan.

出版信息

RSC Adv. 2019 Oct 23;9(59):34120-34124. doi: 10.1039/c9ra07089c.

DOI:10.1039/c9ra07089c

PMID:35529972

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9073632/

Abstract

Nickel nanoclusters grown inside single-walled carbon nanotubes (SWCNT) were studied by infrared scattering-type scanning near-field optical microscopy (s-SNOM). The metal clusters give high local contrast enhancement in near-field phase maps caused by the excitation of free charge carriers. The experimental results are supported by calculations using the finite dipole model, approximating the clusters with elliptical nanoparticles. Compared to magnetic force microscopy, s-SNOM appears much more sensitive to detect metal clusters inside carbon nanotubes. We estimate that these clusters contain fewer than ≈700 Ni atoms.

摘要

通过红外散射型扫描近场光学显微镜（s-SNOM）研究了在单壁碳纳米管（SWCNT）内部生长的镍纳米团簇。由于自由电荷载流子的激发，金属团簇在近场相位图中产生了高局部对比度增强。实验结果得到了使用有限偶极子模型的计算支持，该模型用椭圆形纳米颗粒近似团簇。与磁力显微镜相比，s-SNOM在检测碳纳米管内部的金属团簇方面似乎要灵敏得多。我们估计这些团簇包含的镍原子少于约700个。