氩离子束轰击对金刚石表面浸润性的影响

The Effect of Ar+Ion Beam Bombardment on Wettability of Diamond Surface

金刚石的表面改性及微纳米结构的设计加工,是金刚石功能化应用的重要延伸和探索方向。对金刚石进行离子束轰击处理是进一步扩展其应用场景的重要改性方法。本文采用宽束氩离子束对多晶金刚石片进行轰击处理,在金刚石表面构造了有序纳米波纹图案,并研究金刚石表面波纹图案、化学状态、浸润性随氩离子能量的变化规律。结果表明:改变氩离子能量对波纹形貌的特征尺寸和表面各化学组分的相对含量均有显著影响,从而实现金刚石表面浸润性的调节。原始抛光金刚石片的接触角θ约为32.4°,经能量为30 keV、入射角为64°的氩离子束轰击处理,金刚石表面由亲水变为疏水,接触角θ达到103.2°。这与离子束轰击后,金刚石表面含氧官能团减少,sp^(2) C含量增多和粗糙度增大有密切联系。

The surface modification,the designing and processing of micro-nanostructures of diamonds are important extensions and exploration directions of diamond functionalization applications.Ion beam bombardment treatment for diamonds is an important modification method for further expanding its application scenarios.In this paper,a broad Ar+ion beam was used to bombard the diamond and produce ordered nano ripple morphology in the surface of the diamond.The variation of ripple pattern,chemical state,and wettability of diamond surface as the Ar+ion energy is studied.The results showed that Ar+ion energy have greatly affect on the characteristic size of the ripple and the relative content of each chemical component of the diamond surface.As the increases of the Ar+ion energy,the hydrophobic capacity of the diamond surface increases.When the Ar+ion energy is 30 keV and the incidence angle is 64°,the wettability of the diamond surface changed from hydrophilic(contact angleθ=32.4°)to hydrophobic(contact angleθ=103.2°),which mainly due to the reduction of oxygen-containing functional group and the increases of the sp^(2) C content and roughness of diamond surface.