THERMAL-STABILITY AND THERMAL-BEHAVIOR OF NANOPARTICLE ALPHA-FE2O3-STEARATE ALTERNATING LANGMUIR-BLODGETT MULTILAYER

Thermal stability and thermal behavior of nanoparticulate alpha-Fe2O3- stearate alternating Langmuir-Blodgett multilayer have been studied th rough temperature dependent FTIR spectroscopy. The results show that t his multilayer has an excellent thermal stability. From 60 degrees C t o 150 degrees C, the alkyl chains in the multilayer can keep ''all tra ns'' configuration and the Fe2O3 nanoparticle multilayer film structur e still remains an order structure. From 200 degrees C to 220 degrees C, the film undergoes a phase transition from solid to liquid. This hi gh melting point is due to the high molecular weight (at least 105 ato mic weight units for one nanoparticle) and the stearate ions are chemi cally bonded to it.