纳米碳酸钙基浅色导电粉的制备及性能研究

Preparation and Properties of ITO-Coated CaCO_3 Light-Color Conductive Powders

以纳米碳酸钙为核体,用聚电解质对其表面改性后,采用均相共沉淀法制备了锡掺杂氧化铟(ITO)包覆的碳酸钙基浅色导电粉。通过改变聚电解质层数、ITO的包覆量及煅烧时间等实验条件,探究了制备纳米碳酸钙基浅色导电粉的最佳条件。用X-射线粉末衍射仪、扫描电子显微镜、X-射线电子能谱以及粉末电阻率测试仪等对样品的结构、形貌、化学组成及电阻率等进行分析。结果表明:聚电解质层数为5层,CaCO3与ITO的质量比为6∶1,500℃煅烧4.5 h制备的粉末具有最佳的导电性能,其电阻率为3.8×103Ω·cm。

Conductive composite powders were prepared by uniformly coating indium tin oxide （ITO） on the surface of nano calcium carbonate （ CaCO3 ） particles via a co-precipitation method. For the purpose of improvement of the stability in weak acid aquatic solution, CaCO3 was previously stabilized with polyelectrolyte layers （PEs）. The conductive composite powders were characterized by a series of methods including X-ray diffraction （XRD） , scanning electron microscopy （SEM）, energy dispersive spectrometer （EDS） and resistivity meter, etc. The each effect of coating layers of the polyelectrolyte, the coating ratio of ITO and the calcinations time on the resistivity of the composite powders were studied polyelectrolyte, mass ratio of CaCO3/ITO = 6 and 500 ℃ calcinations for 4.5 h.