Nanoscale pits as templates for building a molecular device
Nanoscale pits as templates for building a molecular device
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DOI：
10.1002/smll.200600699
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发表时间：
2007-05-01
期刊：
影响因子：
13.3
通讯作者：
Grutter, Peter
中科院分区：
文献类型：
--
作者：
Mativetsky, Jeffrey M.;Burke, Sarah A.;Grutter, Peter
基于模板的组装是一种很有前途的在表面构建原子级精度的功能纳米结构的方法。通过使用表面结构来引导吸附物的生长，与单独的自组织相比，可以实现更高水平的控制。[1-3]在这篇文章中，我们展示了一种基于模板的方法，用于在KBrACHTUNGTRENNUNG（001）表面上生产具有可调纳米尺度间距的金纳米颗粒。纳米颗粒之间的间隙与3，4，9，10-二萘嵌苯四甲酸二酐（PTCDA）分子通过将分子捕获在相同的模板结构中来桥接。该方法为在真空中在绝缘体上构建分子器件提供了基础。为了研究生长过程中金属-分子相互作用的重要性，我们还研究了PTCDA和C60与各种金属的连续生长。在表面上模板生长的文献中有许多例子，包括金属在相邻金属表面上的生长，[4]分子在纳米结构金属表面上的生长，[5]和分子在超分子组装体上的生长。[6]然而，对于分子电子学的应用，[7-9]绝缘衬底是至关重要的，因为它允许使用平面几何形状而没有泄漏电流。到目前为止，在绝缘表面上的模板生长的例子很少。[3]自20世纪50年代后期以来，金属吸附物对台阶的装饰一直被用来推断绝缘表面的结构。[10]最近，磁性纳米线和纳米簇阵列已经分别在NaClACHTUNGTRENNUNG（110）和（111）面上产生。[11]此外，辐射诱导的矩形凹坑已被证明能够在KBrACHTUNGTRENNUNG（001）表面上捕获SubPc [12]和PTCDA分子[13，14]。所得分子纳米结构的大小和形状由凹坑的尺寸控制。
Template-based assembly is a promising approach to the construction of functional nanostructures at surfaces with atomic-scale precision. By using surface structures to steer the growth of adsorbates, a higher level of control can be attained in comparison with self-organization alone.[1–3] In this Communication, we demonstrate a template-based method for producing gold nanoparticles with a tunable nanometerscale spacing on a KBrACHTUNGTRENNUNG (001) surface. The gaps between the nanoparticles are bridged with 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA) molecules by trapping the molecules in the same template structures. This approach provides a foundation for constructing a molecular device on an insulator in ultrahigh vacuum. To study the importance of metal–molecule interactions during growth, we also investigate the sequential growth of PTCDA, as well as C60, with various metals.There are many examples in the literature of templated growth on surfaces, including the growth of metals on vicinal metal surfaces,[4] the growth of molecules on nanostructured metal surfaces,[5] and the growth of molecules on supramolecular assemblies.[6] However, for applications in molecular electronics,[7–9] an insulating substrate is critically important since it permits the use of a planar geometry without leakage currents. To date there are few examples of templated growth on insulating surfaces.[3] The decoration of steps by metal adsorbates has been used to infer the structure of insulating surfaces since the late 1950s.[10] More recently, magnetic nanowire and nanocluster arrays have been created on facetted NaClACHTUNGTRENNUNG (110) and (111) surfaces, respectively.[11] In addition, radiation-induced rectangular pits have been shown to be capable of trapping SubPc [12] and PTCDA molecules [13, 14] on a KBrACHTUNGTRENNUNG (001) surface. The size and shape of the resulting molecular nanostructures is controlled by the dimensions of the pits.