Tribological behaviors of lanthanum-based phosphonate 3-aminopropyltriethoxysilane self-assembled films
Tribological behaviors of lanthanum-based phosphonate 3-aminopropyltriethoxysilane self-assembled films
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DOI：
10.1016/j.apsusc.2007.01.132
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发表时间：
2007-06
影响因子：
6.7
通讯作者：
Qinlin Gu;Xianhua Cheng
中科院分区：
文献类型：
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作者：
Qinlin Gu;Xianhua Cheng
采用特制溶液自组装的方法，在羟基化玻璃衬底上制备了磷酸3-氨基丙基三乙氧基硅烷（APTES）自组装单层（SAM）镧基薄膜。用x射线光电子能谱（XPS）检测了薄膜的化学成分和元素的化学状态。用椭圆计测定了薄膜的厚度，用原子力显微镜（AFM）和扫描电子显微镜（SEM）分别分析了样品的原始表面和磨损表面的形貌。在UMT-2MT往复摩擦磨损试验机上对膜与GCr15钢球的摩擦磨损性能进行了评价。结果表明，得到了目标薄膜，并且薄膜与玻璃衬底之间可能发生了反应。摩擦学结果表明，镧基薄膜与磷酸APTES-SAM和磷酸APTES-SAM相比，具有更好的减摩擦和抗磨损性能。对磨损表面形貌的SEM观察表明，APTES-SAM及其磷酸化APTES-SAM的磨损表现为脆性断裂和严重磨损。而镧基薄膜的磨损主要表现为轻微磨损和微裂纹。镧基薄膜优异的减摩性和耐磨性是由于镧基薄膜中无机镧颗粒的承载能力增强以及薄膜与基体的良好附着力所致。
Lanthanum-based thin films deposited on the phosphonate 3-aminopropyltriethoxysilane (APTES) self-assembled monolayer (SAM) were prepared on the hydroxylated glass substrate by a self-assembling process from specially formulated solution. Chemical compositions of the films and chemical state of the elements were detected by X-ray photoelectron spectrometry (XPS). The thickness of the films was determined with an ellipsometer, while the morphologies of the original and worn surfaces of the samples were analyzed by means of atomic force microscopy (AFM) and scanning electron microscopy (SEM), respectively. The tribological properties of the films sliding against GCr15 steel ball were evaluated on a UMT-2MT reciprocating friction and wear tester. As the results, the target film was obtained and reaction may have taken place between the film and the glass substrate. The tribological results show that lanthanum-based thin films are superior in reducing friction and resisting wear compared with APTES-SAM and phosphorylated APTES-SAM. SEM observation of the morphologies of worn surfaces indicates that the wear of APTES-SAM and the phosphorylated APTES-SAM is characteristic of brittle fracture and severe abrasion. Differently, slight abrasion and micro-crack dominate the wear of lanthanum-based thin films. The superior friction reduction and wear resistance of lanthanum-based thin films are attributed to the enhanced load-carrying capacity of the inorganic lanthanum particles in the lanthanum-based thin films as well as good adhesion of the films to the substrate.