Influence of additives on properties of sol-gel layers

The addition of glutardialdehyde, 3,4-dimethoxybenzaldehyde or aminocaproic acid enables a modification of the properties of the layers resulting from the sol-gel process of tetraethoxysilane (TEOS). Kinetics of various hydro lysis and condensation reaction steps were analyzed by Si-29 and C-13 Nucle ar magnetic resonance spectroscopy. X-ray photoelectron spectroscopy studie s give evidence that the additive molecules are also located on the surface . The layer morphology was characterized by atomic force microscopy. (C) 20 00 Elsevier Science B.V. All rights reserved.