arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.00689cond-mat.mtrl-sci
收藏

气相反应法在空气悬浮碳纳米管中形成有机色心

Formation of Organic Color Centers in Air-Suspended Carbon Nanotubes Using Vapor-Phase Reaction

D. Kozawa, X. Wu, A. Ishii, J. Fortner, K. Otsuka, R. Xiang, T. Inoue, S. Maruyama, Y. Wang, Y. K. Kato

摘要:

单壁碳纳米管中的有机色心已经证明了在室温下产生电信范围内的单光子的卓越能力。将色心与原始的空气悬浮管相结合对于改善性能是理想的,但是所有当前的合成方法都发生在溶液中,这使得它们不相容。在这里,我们展示了使用气相反应在空气悬浮纳米管中形成色心。通过光致发光光谱法在相同的纳米管上直接验证了功能化,并从数千个单独的纳米管中获得了明确的统计数据。色心表现出强烈的直径依赖性的发射强度,这可以解释与化学反应性的理论模型,考虑到沿管曲率的应变。我们也能够估计的缺陷密度,通过比较实验与模拟的基础上的一维扩散方程,而直径相关的峰值能量的分析提供了洞察掺杂剂状态的性质。时间分辨的测量结果表明,一个较长的寿命为色心发射相比,E $_{11}$激子状态。我们的研究结果突出了管结构对气相反应性和发射特性的影响,为开发高性能近红外量子光源提供了指导。

英文摘要:

Organic color centers in single-walled carbon nanotubes have demonstrated exceptional ability to generate single photons at room temperature in the telecom range. Combining the color centers with pristine air-suspended tubes would be desirable for improved performance, but all current synthetic methods occur in solution which makes them incompatible. Here we demonstrate formation of color centers in air-suspended nanotubes using vapor-phase reaction. Functionalization is directly verified on the same nanotubes by photoluminescence spectroscopy, with unambiguous statistics from more than a few thousand individual nanotubes. The color centers show a strong diameter-dependent emission intensity, which can be explained with a theoretical model for chemical reactivity taking into account strain along the tube curvature. We are also able to estimate the defect density by comparing the experiments with simulations based on a one-dimensional diffusion equation, whereas the analysis of diameter dependent peak energies gives insight to the nature of the dopant states. Time-resolved measurements show a longer lifetime for color center emission compared to E$_{11}$ exciton states. Our results highlight the influence of the tube structure on vapor-phase reactivity and emission properties, providing guidelines for development of high-performance near-infrared quantum light sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑