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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Initial Stage of para-Hexaphenyl Thin-Film Growth Controlled by the Step Structure of the Ion-Beam-Modified TiO2(110) Surface
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Initial Stage of para-Hexaphenyl Thin-Film Growth Controlled by the Step Structure of the Ion-Beam-Modified TiO2(110) Surface

机译：由离子束改性TiO2（110）表面的步骤结构控制的对六六苯基薄膜生长的初始阶段

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摘要

Organic electronics require a precise control over properties of a molecule substrate interface as well as film growth morphology, from both fundamental points of view, when a clean vacuum environment is needed and also under ambient air conditions. In this paper, we present submonolayer molecular films of para-hexaphenyl (6P) formation on the rutile TiO2(110) substrates and ways of affecting the growth and morphology via ion-beam nano-patterning. Ultrahigh vacuum deposition and measurements are followed by the film evolution study upon air exposure. Strongly anisotropic TiO2(110) surfaces, in the form of terraced ripples with a preserved (1 x 1) structure, were controllably fabricated utilizing ion-beam bombardment and characterized by means of high-resolution scanning tunneling microscopy and low-energy electron diffraction. 6P thin films were prepared using organic molecular beam epitaxy and characterized in situ by noncontact atomic force microscopy. Ex situ characterization was performed by tapping-mode atomic force microscopy, scanning electron microscopy, and noncontact atomic force microscopy with molecular resolution. We have demonstrated that by changing the size of locally preserved (1 x 1) surface areas, determined by the ripple parameters, different 6P assemblies can be promoted. With the shrinking size of the uninterrupted (1 x 1) terminated areas, 6P changes its growth morphology from needlelike to islandlike accompanied by a reorientation of the molecules from flat-lying to upright-standing. The resulting morphology depends on the structure of a two-dimensional phase of lying molecules formed at the initial stage of deposition, which can be either a well-ordered wetting layer or a two-dimensional mobile lattice gas. The postgrowth remainders of these two-dimensional phases participate in additional nucleation processes forming small islands or clusters.
机译：有机电子器件需要精确控制分子衬底界面以及膜生长形态的性质，从两个根本的观点来看，当需要清洁的真空环境并且在环境空气条件下。在本文中，我们在金红石TiO 2（110）衬底上呈现对己烷基（6P）形成的亚烷基聚合物分子膜及通过离子束纳米图案地影响生长和形态的方式。在空气暴露时，薄膜进化研究之后是超高真空沉积和测量。具有保存（1×1）结构的梯形涟漪的梯形涟漪形式的强烈各向异性TiO2（110）表面利用离子束轰击来控制，并通过高分辨率扫描隧道显微镜和低能量电子衍射来表征。使用有机分子束外延制备6P薄膜，并通过非接触原子力显微镜表征原位。通过攻丝模式原子力显微镜，扫描电子显微镜和具有分子分辨率的非接触原子力显微镜进行EX原位表征。我们已经证明，通过改变由纹波参数确定的局部保存（1×1）表面区域的尺寸，可以促进不同的6P组件。随着不间断（1×1）终止区域的缩小尺寸，6P改变了从针状到岛状的增长形态，伴随着分子从平坦躺着直立的分子的重新定位。所得到的形态学取决于在沉积初始阶段形成的躺着分子的二维阶段的结构，其可以是井有序的润湿层或二维移动晶格气。这些二维阶段的后期剩余者参与额外的成核过程，形成小岛或簇。

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