Adsorption of silanes bearing nitrogenated Lewis bases on SiO 2/Si (100) model surfaces

• Published in: Journal of colloid and interface science Vol. 286; no. 1; pp. 303 - 309
• Main Authors: Andresa, Juliana Salvador, Reis, Rafael Machado, Gonzalez, Eduardo Perez, Santos, Leonardo Silva, Eberlin, Marcos Nogueira, de Paula Nascente, Pedro Augusto, Tanimoto, Sonia Tomie, Machado, Sérgio Antônio Spínola, Rodrigues-Filho, Ubirajara P.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-06-2005
• Subjects: 3-Imidazolylpropyltrimethoxysilane; 4-( N-Propyltriethoxysilane-imino)pyridine; AFM; MALDI-TOF MS; Self-assembled thin films; Silicon dioxide; Silicon wafer; XPS; MALDI-TOF MS; Self-assembled thin films; 3-Imidazolylpropyltrimethoxysilane; Silicon wafer; AFM; XPS; 4-( N-Propyltriethoxysilane-imino)pyridine; Silicon dioxide
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2005.01.019

The present paper describes the one-pot procedure for the formation of self-assembled thin films of two silanes on the model oxidized silicon wafer, SiO
2/Si. SiO
2/Si is a model system for other surfaces, such as glass, quartz, aerosol, and silica gel. MALDI-TOF MS with and without a matrix, XPS, and AFM have confirmed the formation of self-assembled thin films of both 3-imidazolylpropyltrimethoxysilane (3-IPTS) and 4-(
N-propyltriethoxysilane-imino)pyridine (4-PTSIP) on the SiO
2/Si surface after 30 min. Longer adsorption times lead to the deposition of nonreacted 3-IPTS precursors and the formation of agglomerates on the 3-IPTS monolayer. The formation of 4-PTSIP self-assembled layers on SiO
2/Si is also demonstrated. The present results for the flat SiO
2/Si surface can lead to a better understanding of the formation of a stationary phase for affinity chromatography as well as transition-metal-supported catalysts on silica and their relationship with surface roughness and ordering. The 3-IPTS and 4-PTSIP modified SiO
2/Si wafers can also be envisaged as possible built-on-silicon thin-layer chromatography (TLC) extraction devices for metal determination or
N-heterocycle analytes, such as histidine and histamine, with “on-spot” MALDI-TOF MS detection.