FT-IR characterization of the acidic andbasic sites on a nanostructured aluminum nitride surface

摘要

A nanostructured aluminum nitride powder prepared by sol-gel type chemical syntheiss is analyzed by Foruier transform infrared spectrometry. The surface acidic and basic sites are probed out by adsorption of several organic molecules. Resulting from the unavoidabel presence of oxygen, the aluminum nitride surface is an oxinitride layer in fact, and its surface chemistry should present some analogies with alumina. Therefore, a though comparison between the acido-basicity of aluminum nitride and aluminum oxide is discussed. The remaining nitrogen atoms in the first atomic layer modify the acidity-basicity relative balance and reveals the specificity of the aluminum nitride surface.