Suwazono Yutaka, Murayoshi Takuro, Nagai Hiroki, Sato Mitsunobu
Applied Chemistry and Chemical Engineering Program, Graduate School, Kogakuin University, Tokyo 192-0015, Japan.
Electrical Engineering and Electronics Program, Graduate School, Kogakuin University, Tokyo 192-0015, Japan.
Nanomaterials (Basel). 2021 Dec 10;11(12):3352. doi: 10.3390/nano11123352.
A single-walled carbon nanotube/anatase (SWCNT/anatase) composite thin film with a transmittance of over 70% in the visible-light region was fabricated on a quartz glass substrate by heat treating a precursor film at 500 °C in air. The precursor film was formed by spin coating a mixed solution of the titania molecular precursor and well-dispersed SWCNTs (0.075 mass%) in ethanol. The anatase crystals and Ti ions in the composite thin films were determined by X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The effect of the heating process on the SWCNTs was analyzed using Raman spectroscopy. The composite film showed an even surface with a scratch resistance of 4H pencil hardness, as observed using field-emission scanning electron microscopy and atomic force microscopy. The electrical resistivity and optical bandgap energy of the composite thin film with a thickness of 100 nm were 6.6 × 10 Ω cm and 3.4 eV, respectively, when the SWCNT content in the composite thin film was 2.9 mass%. An anodic photocurrent density of 4.2 μA cm was observed under ultraviolet light irradiation (16 mW cm at 365 nm) onto the composite thin film, thus showing excellent properties as a photoelectrode without conductive substrates.
通过在空气中于500℃对前驱体薄膜进行热处理，在石英玻璃基板上制备了一种在可见光区域透过率超过70%的单壁碳纳米管/锐钛矿（SWCNT/锐钛矿）复合薄膜。前驱体薄膜是通过旋涂二氧化钛分子前驱体与乙醇中充分分散的SWCNT（0.075质量%）的混合溶液形成的。分别通过X射线衍射和X射线光电子能谱确定复合薄膜中的锐钛矿晶体和钛离子。使用拉曼光谱分析加热过程对SWCNT的影响。用场发射扫描电子显微镜和原子力显微镜观察到，复合薄膜表面均匀，具有4H铅笔硬度的耐刮性。当复合薄膜中SWCNT含量为2.9质量%时，厚度为100nm的复合薄膜的电阻率和光学带隙能量分别为6.6×10Ω·cm和3.4eV。在紫外光（365nm处16mW/cm²）照射复合薄膜时，观察到阳极光电流密度为4.2μA/cm²，因此作为无导电基板的光电极显示出优异的性能。
