화학공학소재연구정보센터
Langmuir, Vol.14, No.20, 5845-5849, 1998
Reaction between silane and the lattice oxygen of transition metal oxides
The reaction between SiH4 and the lattice oxygen of NiO, CoO, or Fe2O3 was investigated by pulse mass spectrometry, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) techniques. The pulse reaction indicated that almost no homogeneous conversion of SiH4 took place until 400 degrees C; the conversion was, however, 19% over NiO, at the low temperature of 100 degrees C. The conversions over oxides followed the sequence CoO > Fe2O3 > NiO. The TEM and XPS investigations allowed one to conclude that SiH4 is converted into amorphous SiO2 and NiSiO3 over NiO and into amorphous SiHxOy over CoO and Fe2O3, with a value of y larger over Fe2O3. The bond strength between the lattice oxygen and the transition metal is mainly responsible for the above behavior; the weaker the bond strength, the easier the oxidation.