Au纳米颗粒织构化表面的黏着和摩擦学行为研究

利用自组装技术在单晶硅(100)面制备了Au纳米颗粒织构化表面(nanoparticle-textured surfaces,NPTS),采用原子力显微镜(AFM)和UMT-2MT摩擦磨损试验机考察了Au纳米颗粒织构化对表面微/纳尺度黏着与摩擦性能的影响机理.结果表明:在颗粒堆积密度较低的表面,接触力学符合连续接触力学模式;在颗粒堆积密度较高的表面,形成多峰接触,有效地减少了接触面积,降低了黏着和摩擦.与光滑硅表面相比,组装时间为3.0 h的Au纳米颗粒织构化表面的黏着力降低了77%,在试验载荷为7 nN时,其摩擦力降低了42%.

Adhesive and Frictional Properties of AuNanoparticle-textured Surfaces

Au nanoparticle-textured surfaces were prepared on the silicon (100) surfaces by using the self-assembly techniques. The atomic force microscope (AFM) and UMT-2MT tribometer were used to examine the adhesion and friction mechanisms in micro-/nano-scales of nanoparticle-textured surfaces. The results showed that: in textured surfaces with low texture densities, the continuum contact mechanics model was found to be applicable to the surface contact between the tip and the textured surfaces in nano-scale. While in the higher texture density surfaces, the surface contact mechanic between the tip and Au nanoparticle-textured surfaces followed the multi-asperity contact model which effectively reduced the contact area, accordingly reducing the adhesion and friction. Compared with the smooth surface of silicon, the adhesion force of the Au NPTS at assembling time of 3.0 h was reduced by 77%, and the friction force of the Au NPTS at assembling time of 3.0 h was reduced by 42% under the normal load of 7 nN.