研究目的
The study aims to investigate the electronic properties of single-walled carbon nanotubes (SWCNTs) filled with rubidium iodide (RbI), focusing on the n-doping effects induced by the encapsulated salt and the alterations in Raman modes of the filled metallic and semiconducting SWCNTs.
研究成果
The study successfully filled SWCNTs with rubidium iodide, confirmed by HR STEM and XPS. The encapsulated salt led to n-doping of nanotubes, with detailed multifrequency Raman spectroscopy revealing doping-induced changes in the RBM- and G-bands. These changes differed for metallic and semiconducting SWCNTs, providing valuable data for interpreting Raman spectra of filled SWCNTs in future studies.
研究不足
The study deals with a buckypaper sample of bundled SWCNTs, where individual nanotubes may have slightly different doping levels. The inhomogeneities in doping could lead to variations in the shifts of the Raman peaks, although the broadening of the bands was minimal. The study suggests that batches of single chirality-enriched SWCNTs would be beneficial for revealing underlying mechanisms of changes in the RBM-band of SWCNTs.
1：Experimental Design and Method Selection:
The study involved filling SWCNTs with RbI and characterizing the filled nanotubes using high-resolution scanning transmission electron microscopy (HR STEM), X-ray photoelectron spectroscopy (XPS), and multifrequency Raman spectroscopy.
2：Sample Selection and Data Sources:
SWCNTs synthesized by the arc-discharge method with a mean diameter of
3：4 nm were used. The filling process involved annealing the SWCNTs in air to remove caps, sealing them with RbI powder in an evacuated quartz ampoule, and heating. List of Experimental Equipment and Materials:
HR STEM imaging was conducted using a Nion UltraSTEM 100 microscope. Raman spectra were measured using a Horiba Jobin Yvon LabRAM HR800 spectrometer with various lasers for excitation. XPS measurements were performed using a SPECS XPS spectrometer.
4：Experimental Procedures and Operational Workflow:
The filling process, HR STEM imaging, Raman spectroscopy, and XPS measurements were detailed, including preparation steps and measurement conditions.
5：Data Analysis Methods:
Raman spectra were fitted to Voigtian and Fano peaks, and area intensities were calculated with PeakFit v4.12. XPS data analysis included survey and detailed spectra with specific pass energies.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
