Studi Pengaruh Presipitan Basa Terhadap Sifat Fisik Nanomaterial Cerium Dioksida (CeO2) dengan Metode Presipitasi

Abstract

Cerium oxide (CeO), also known as  ceria, is an oxide of the rare-earth metal cerium. Cerium occurs naturally as a mixture with other rare-earth elements in its principal ores bastnaesite and monazite. Ceria is one of interest as a material for solid oxide fuel cells (SOFCs) because of its relatively high oxygen ion conductivity at intermediate temperatures (500–650 °C) and lower association enthalpy compared to Zirconia system. Ceria is also an essential component of phosphors, sensors, battery and glass polishing powders used in screens, camera lens, fluorescent lamps, ophthalmic glasses, etc. In this study, ceria nanoparticles were synthesized by precipitation method. Cerium nitrate hexahydrate was used as a precursor material, while carbonate (potassium carbonate) and three bases (potassium hydroxide, sodium hydroxide, and ammonium hydroxide) were used as precipitants. The properties of ceria nanoparticles were characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and particle size analyzer (PSA). The XRD patterns showed face-centred cubic of Ceria nanoparticles with smallest crystallite size as estimated by XRD technique was around 14 nm by ammonium hydroxide used as a base precipitant. The sharp peaks in FTIR spectrum determined the purity of ceria nanoparticles. PSA measurement showed the smallest particle size of ceria nanoparticles was 950 nm, which used sodium hydroxide as a base precipitant.