Silanization of solid surfaces via mercaptopropylsilatrane: A new approach of constructing gold colloid monolayers

Wen Hao Chen, Yen Ta Tseng, Shuchen Hsieh, Wan Chun Liu, Chiung Wen Hsieh, Chin Wei Wu, Chen Han Huang, Hsing Ying Lin, Chao Wen Chen, Pei Ying Lin, Lai Kwan Chau

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Mercaptopropylsilatrane (MPS) was investigated as a novel self-assembled film on silica surfaces and also as a novel adhesive layer for the construction of a gold colloid monolayer on silica surfaces. We compare the preparation procedure and film quality of the MPS films to those of (3-mercaptopropyl)trimethoxysilane (MPTMS), which is commonly used for anchoring of gold nanoparticles on silica surfaces. The films were characterized by Fourier transform infrared spectroscopy, contact angle measurements, X-ray photoelectron spectroscopy, atomic force microscopy, and Ellman's reagent to determine surface mercaptan concentration. The process in preparing the MPS films involves more environmentally friendly aqueous or polar organic solvents, takes significantly shorter time (<30 min), and results in more uniform and reproducible films due to its insensitivity to moisture. The MPS films also have higher mercaptan surface density than that of the MPTMS films, resulting in higher saturation coverage of the gold colloid monolayers on the MPS-coated substrates. The higher ambient stability of the MPS films as compared to the MPTMS films is important for applications where sufficient durability of the self-assembled films under ambient conditions is required. Thus, mercaptosilatrane may have the potential to replace mercaptosilane for surface modification and as an adhesive layer for the construction of a noble metal colloid monolayer on oxide surfaces.

Original languageEnglish
Pages (from-to)46527-46535
Number of pages9
JournalRSC Advances
Volume4
Issue number87
DOIs
StatePublished - 2014

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