研究目的
To demonstrate the impact of changing the liquid crystal from 4-cyano-4′-pentylbiphenyl (5CB) to 4-cyano-4′-octylbiphenyl (8CB) in the alignment relay technique (ART) for the deposition of SWNTs, focusing on density, alignment, and length.
研究成果
Changing the liquid crystal from 5CB to 8CB in the ART significantly increased the density and decreased the average length of deposited SWNTs, with minimal impact on diameter sorting. This demonstrates the ART's potential for fine-tuning SWNT deposition parameters.
研究不足
The reaction with SiO2 surfaces was slower and required longer reaction times under ambient pressure due to decreased reactivity. Vacuum conditions accelerated film transfer from the alignment layer, complicating the process. The exact positioning of iptycenes on the surface could not be verified.
1：Experimental Design and Method Selection:
The ART involves aligning a liquid crystal/iptycene solution with a rubbed polyimide alignment layer, covalent functionalization of the substrate during alignment, removal of unreacted organics, and deposition of SWNTs in an aqueous suspension.
2：Sample Selection and Data Sources:
SWNTs were deposited on indium?tin oxide (ITO) and silicon dioxide (SiO2) surfaces.
3：List of Experimental Equipment and Materials:
AFM for imaging, Raman spectroscopy for diameter analysis, and liquid crystals (5CB and 8CB) for alignment.
4：Experimental Procedures and Operational Workflow:
The process includes alignment of the liquid crystal/iptycene solution, functionalization of the substrate, removal of unreacted organics, and SWNT deposition.
5：Data Analysis Methods:
AFM images and Raman spectra were analyzed to determine nanotube alignment, density, length, and diameter.
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