Molecular Patterning and Directed Self-Assembly of Gold Nanoparticles on GaAs
Molecular Patterning and Directed Self-Assembly of Gold Nanoparticles on GaAs
复制标题
GaAs 上金纳米颗粒的分子图案化和定向自组装
DOI：
10.1021/acsami.7b14113
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发表时间：
2017-12-13
影响因子：
9.5
通讯作者：
Xiong, Peng
中科院分区：
文献类型：
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作者：
Liu, Tianhan;Keiper, Timothy;Xiong, Peng
在半导体表面创建有机自组装单层（SAMs）的微/纳米模式的能力对于纳米科学中许多新兴领域的基础研究和应用至关重要。在这里，我们展示了通过浸笔纳米光刻（DPN）和微接触印刷（mu CP）在无氧化物砷化镓表面上直接图案化硫酸盐SAMs，这是由表面蚀刻和砷化镓钝化过程促进的。通过观察DPN在纳米尺度上的点状和线状图案的书写，定量分析了分子在GaAs上的扩散，结果与表面扩散模型吻合较好。通过将金纳米粒子（Au NPs）定向自组装到砷化镓上的4-氨基噻吩（ATP） SAM模板上，证明了图图化硫醇分子的功能。原子力显微镜（AFM）和扫描电镜（SEM）显示了Au NPs的高选择性组装。利用分子模板精确控制Au NPs在无氧化物半导体表面上的组装的能力可能会导致一种有效的自下而上的方法来制造纳米等离子体结构。
The ability to create micro-/nanopatterns of organic self-assembled monolayers (SAMs) on semiconductor surfaces is crucial for fundamental studies and applications in a number of emerging fields in nanoscience. Here, we demonstrate the direct patterning of thiolate SAMs on oxide-free GaAs surface by dip-pen nanolithography (DPN) and microcontact printing (mu CP), facilitated by a process of surface etching and passivation of the GaAs. A quantitative analysis on the molecular diffusion on GaAs was conducted by examining the writing of nanoscale dot and line patterns by DPN, which agrees well with surface diffusion models. The functionality of the patterned thiol molecules was demonstrated by directed self-assembly of gold nanoparticles (Au NPs) onto a template of 4-aminothiophenol (ATP) SAM on GaAs. The highly selective assembly of the Au NPs was made evident with atomic force microscopy (AFM) and scanning electron microscopy (SEM). The ability to precisely control the assembly of Au NPs on oxide-free semiconductor surfaces using molecular templates may lead to an efficient bottom up method for the fabrication of nanoplasmonic structures.