期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 49, 页码 27421-27431出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09309
关键词
ionic liquids; coatings; titanium; atomic force microscopy; X-ray photoelectron spectroscopy
资金
- University of Texas at Dallas (UTD)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) (IMG)
- Conselho Nacional de Desenvolvimento Cientiftco e Tecnologico (CNPq) [474895/2013-0, 475556/2012-7]
- Rio Grande do Sul Foundation for Research Support (FAPERGS) [2262-2551/14-1, 2290-2551/14-1]
Dicationic imidazolium-based ionic liquids (ILs) having bis(trifluoromethylsulfonyl)imide (NTf2) and amino add based (methionine and phenylalanine) anionic moieties were synthesized and used to coat titanium surfaces using a dip-coating technique. Dicationic moieties with varying alkyl chains (8 and 10 carbons) and anions with distinct characteristics were selected to understand the influence of IL structural features on deposition profile. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were used in this study to help elucidate intermolecular interactions within ILs as well as between ILs and TiO2 surfaces and to investigate IL coating morphology. Charge concentration on IL moieties, as well as the presence of functional groups that can interact via hydrogen bond, such as carboxylate and amino groups, were observed to influence the deposition profile. ILs containing amino acids as the anionic moiety were observed to interact strongly with TiO2, which resulted in more pronounced changes in Ti 2p binding energy. The higher hydrophobicity of the IL having NTf2 as the anionic moiety resulted in higher adhesion strength between the IL coating and TiO2.
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