Instituto de Carboquímica, ICB-CSIC, Miguel Luesma Castán 4, 50018, Zaragoza, Spain.
Chemphyschem. 2019 Mar 18;20(6):838-847. doi: 10.1002/cphc.201900066. Epub 2019 Mar 8.
The transfer of nanoscale properties from single-walled carbon nanotubes (SWCNTs) to macroscopic systems is a topic of intense research. In particular, inorganic composites of SWCNTs and metal oxide semiconductors are being investigated for applications in electronics, energy devices, photocatalysis, and electroanalysis. In this work, a commercial SWCNT material is separated into fractions containing different conformations. The liquid fractions show clear variations in their optical absorbance spectra, indicating differences in the metallic/semiconducting character and the diameter of the SWCNTs. Also, changes in the surface chemistry and the electrical resistance are evidenced in SWCNT solid films. The starting SWCNT sample and the fractions as well are used to prepare hybrid electrodes with titanium dioxide (SWCNT/TiO ). Raman spectroscopy reflects the optoelectronic properties of SWCNTs in the SWCNT/TiO electrodes, while the electrochemical behavior is studied by cyclic voltammetry. A selective development of charge transfer characteristics and double-layer behavior is achieved through the suitable choice of SWCNT fractions.
从单壁碳纳米管（SWCNT）到宏观系统的纳米级性能转移是一个研究热点。特别是，SWCNT 和金属氧化物半导体的无机复合材料正在被应用于电子、能源设备、光催化和电化学生物传感器等领域。在这项工作中，一种商业的 SWCNT 材料被分离成具有不同构象的组分。液体组分在其光学吸收光谱中显示出明显的变化，表明 SWCNT 的金属/半导体特性和直径存在差异。此外，SWCNT 固体薄膜中的表面化学和电阻也发生了变化。起始的 SWCNT 样品和组分都被用于制备与二氧化钛（SWCNT/TiO ）的混合电极。拉曼光谱反映了 SWCNT 在 SWCNT/TiO 电极中的光电性能，而通过循环伏安法研究了电化学行为。通过适当选择 SWCNT 组分，可以实现对电荷转移特性和双层行为的选择性发展。
