Novel self-assembled films of La-based phosphonate 3-aminopropyltriethoxysilane
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：QI Yong GU Qinlin CHENG Xianhua
Key words：La-based thin films; characterization; APTES; self-assembled monulayer; rare earths;
Abstract: Silane coupling reagent (3-aminopropyltriethoxysilane (APTES)) was prepared on single-crystal silicon substrates to form two-dimensional self-assembled monolayer (SAM). The terminal-NH_2 groups in the film were in situ phosphorylated to-PO(OH)_2 group to endow the film with good chemisorption ability. Then La-based thin films were deposited on phosphorylated APTES-SAM in order to make good use of the chemisorption ability of-PO(OH)_2 groups. The thickness of the film was determined with ellipsometer, while phase trans-formation and surface morphology, surface energy, phase composition were analyzed by means of atomic force microscope (AFM), contact angle measurements and X-ray photoelectron spectroscopy (XPS). The results indicated that the terminal -NH_2 groups could be completely transformed into desirable-PO(OH)_2 groups after phosphorylation of APTES-SAM. Detailed XPS analysis of the La3+ peaks revealed that lanthanum element existed in the films in different states. As a result, conclusion could be made that lanthanum reacted with-PO(OH)_2 groups on the surface of the substrate by chemical bond which would improve the bonding strength between the film and silicon substrate.Since the La-based thin films were well adhered to the silicon substrate, it might find promising application in the surface-modification of single-crystal Si and SiC in microelectromechanical systems (MEMS).
QI Yong1，GU Qinlin1，CHENG Xianhua1
(1.School of Mechanical & Power Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;
2.National Engineering Research Center for Nanotechnology,Shanghai 200237, China)
Abstract:Silane coupling reagent (3-aminopropyltriethoxysilane (APTES)) was prepared on single-crystal silicon substrates to form two-dimensional self-assembled monolayer (SAM). The terminal-NH_2 groups in the film were in situ phosphorylated to-PO(OH)_2 group to endow the film with good chemisorption ability. Then La-based thin films were deposited on phosphorylated APTES-SAM in order to make good use of the chemisorption ability of-PO(OH)_2 groups. The thickness of the film was determined with ellipsometer, while phase trans-formation and surface morphology, surface energy, phase composition were analyzed by means of atomic force microscope (AFM), contact angle measurements and X-ray photoelectron spectroscopy (XPS). The results indicated that the terminal -NH_2 groups could be completely transformed into desirable-PO(OH)_2 groups after phosphorylation of APTES-SAM. Detailed XPS analysis of the La3+ peaks revealed that lanthanum element existed in the films in different states. As a result, conclusion could be made that lanthanum reacted with-PO(OH)_2 groups on the surface of the substrate by chemical bond which would improve the bonding strength between the film and silicon substrate.Since the La-based thin films were well adhered to the silicon substrate, it might find promising application in the surface-modification of single-crystal Si and SiC in microelectromechanical systems (MEMS).
Key words:La-based thin films; characterization; APTES; self-assembled monulayer; rare earths;
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