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将酸化的碳纳米管(CNT)粉末、硝酸镁置于异丙醇溶剂中超声处理,制备成分散均匀的CNT电泳液.采用不同CNT浓度的电泳液在CrCuCr电极上电泳沉积CNT薄膜,并对阴极样品进行场发射性能测试;同时采用紫外-可见光谱仪对CNT电泳液进行光谱分析.结果表明,CNT浓度为0~0.13 g/L的电泳液在258 nm处存在光谱吸收,且其吸光度与相应CNT浓度呈良好的线性关系;当CNT浓度为0.12 g/L时电泳沉积制备的CNT阴极场发射性能较好,其开启电场为0.903 V/μm,当电场强度为1.395 V/μm时场发射电流密度为2.903 mA/cm2.利用紫外-可见光谱可以有效地分析电泳液中CNT浓度,为电泳沉积良好质量的CNT薄膜提供了保证.
The acidified carbon nanotubes (CNTs) powder and magnesium nitrate were sonicated in isopropanol solvent to prepare uniformly dispersed CNT electrophoresis solution.The CNT films were electrophoretically deposited on CrCuCr electrodes with different concentrations of CNTs, The results showed that there was spectral absorption at 258 nm for the electrophoresis solution with CNT concentration of 0 ~ 0.13 g / L, and the absorbance of the CNTs was corresponding to that of the corresponding CNTs exhibited a good linear relationship. CNTs prepared by electrophoretic deposition showed good emission performance when the concentration of CNT was 0.12 g / L, and the turn-on electric field was 0.903 V / μm. When the electric field intensity was 1.395 V / μm, the field emission current The density is 2.903 mA / cm2.The UV-Vis spectrum can effectively analyze the concentration of CNTs in the electrophoresis liquid, which provides a guarantee for electrophoretic deposition of good quality CNT films.