Dispersion of CeO₂ Nanoparticles on Hexagonal Boron Nitride by a Simple CVD Method

ABSTRACT

CeO₂ nanoparticles were dispersed on hexagonal boron nitride (hBN) supports by a rotary chemical vapor deposition method using Ce(DPM)₄ as a precursor at 600°C, and extra oxygen was introduced to assist the decomposition and oxidation of the precursor. A significant composition and structure dependent nature was observed on the oxidation supply rate by eliminating the organic molecules and fragments and assisting the decomposition of the Ce(DPM)₄ precursor. The CeO₂ nanoparticles were 10-15 nm in diameter, with the measured spacings of the lattice fringes as 0.31 and 0.27 nm, corresponding to (111) and (200) plane, respectively, which are in agreement with the standard data (JCPDS: 34-0394). In addition, with the oxidative decomposition of precursor Ce(DPM)₄, CeO₂ nanoparticles were produced and then coated on the ceramic surface through the CVD method, presenting the preferred orientation. The deposition mechanism was also discussed.

GRAPHICAL ABSTRACT

Keywords:

• CeO₂/hBN
• Nanopowders
• Chemical vapor deposition
• Oxygen supply rate
• Decomposition
• Coating mechanism