Composites of Co-Doped Graphitic C 3 N 4 Nanosheets and TiO 2 Nanoparticles for Electrorheological Fluid Applications

作者：Bo Zhang, Yi Chen, Haonan Zheng, Changhao Li, Lili Ma, Hong Zhang, Baoxiang Wang, Chuncheng Hao · 发表于：ACS Applied Nano Materials · 年份：2022 · DOI：10.1021/acsanm.1c03682 · 被引用次数：28 · 研究领域：Vibration Control and Rheological Fluids、Dielectric materials and actuators、Advanced Sensor and Energy Harvesting Materials

Herein, composites of Co-doped graphitic C 3 N 4 nanosheets and TiO 2 nanoparticles (Co-C 3 N 4 NSs/TiO 2 NPs) were prepared through a two-step synthetic strategy, and their electrorheological (ER) performance under varied electric field strengths was also researched. The microstructure, chemical elements, and surface morphology of materials were studied thoroughly by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) test, and X-ray photoelectron spectroscopy (XPS) measurements. The presence of TiO 2 NPs and g-C 3 N 4 was confirmed by XRD and FTIR results. Typical SEM and TEM images revealed the apparent sheet-like nanostructure of Co-C 3 N 4, and the filling of TiO 2 NP in-layers was discovered. Meanwhile, BET results indicated the abundant pore structure of Co-C 3 N 4 NSs/TiO 2 NP composites. The ER performances of Co-C 3 N 4 NSs/TiO 2 NP composites, including shear stress, shear viscosity, and ER efficiency, were examined under different electric field strengths with a high-quality electrorheometer. Interestingly, the obtained Co-C 3 N 4 NSs/TiO 2 NP composites exhibited an excellent ER property including an unexpected ER efficiency (up to 196), superior platform area, obvious dielectric loss peak, and high shear stress (more than 600 Pa at 3.0 kV/mm), showing wide application prospects as electrorheological materials.