Silver nanoparticles with tunable work functions
Silver nanoparticles with tunable work functions
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DOI：
10.1063/1.4933253
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发表时间：
2015-10
影响因子：
4
通讯作者：
Pangpang Wang;D. Tanaka;Sou Ryuzaki;Shohei Araki;K. Okamoto;K. Tamada
中科院分区：
文献类型：
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作者：
Pangpang Wang;D. Tanaka;Sou Ryuzaki;Shohei Araki;K. Okamoto;K. Tamada
为了提高电子器件的效率，需要具有可变功函数的材料来减小工作层之间界面处的能级差。在这里，我们报告了一种方法来获得具有可调功函数的银纳米粒子，其具有相同的银核直径为5 nm，并分别由肉豆蔻酸酯和1-辛硫醇酯自组装单分子膜覆盖。有机分子包覆的银纳米粒子在空气-水界面上可以形成均匀的二维薄片，这种薄片可以转移到各种疏水基底上。在开尔文探针力显微镜方面测量二维纳米颗粒片的表面电势，然后通过与参考材料比较从表面电势值计算片的功函数。封端分子的交换导致约150-250 meV的功函数变化，而不影响它们的疏水性。系统地讨论了功函数差异的来源，发现功函数差异主要来自配体分子的锚基团。功函数可调的有机分子包覆纳米粒子在有机电子器件中具有潜在的应用前景。
To improve the efficiencies of electronic devices, materials with variable work functions are required to decrease the energy level differences at the interfaces between working layers. Here, we report a method to obtain silver nanoparticles with tunable work functions, which have the same silver core of 5 nm in diameter and are capped by myristates and 1-octanethoilates self-assembled monolayers, respectively. The silver nanoparticles capped by organic molecules can form a uniform two-dimensional sheet at air-water interface, and the sheet can be transferred on various hydrophobic substrates. The surface potential of the two-dimensional nanoparticle sheet was measured in terms of Kelvin probe force microscopy, and the work function of the sheet was then calculated from the surface potential value by comparing with a reference material. The exchange of the capping molecules results in a work function change of approximately 150–250 meV without affecting their hydrophobicity. We systematically discussed the origin of the work function difference and found it should come mainly from the anchor groups of the ligand molecules. The organic molecule capped nanoparticles with tunable work functions have a potential for the applications in organic electronic devices.