Rhombic Coulomb diamonds in a single-electron transistor based on an Au nanoparticle chemically anchored at both ends
Rhombic Coulomb diamonds in a single-electron transistor based on an Au nanoparticle chemically anchored at both ends
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基于两端化学锚定的金纳米颗粒的单电子晶体管中的菱形库仑金刚石
DOI：
10.1039/c5nr08965d
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发表时间：
2016
期刊：
影响因子：
6.7
通讯作者：
Yutaka Majima
中科院分区：
文献类型：
--
作者：
Yasuo Azuma;Yuto Onuma;Masanori Sakamoto;Toshiharu Teranishi;Yutaka Majima
在化学锚定的金纳米粒子单电子晶体管中清晰地观察到菱形库仑钻石。稳定性图显示稳定的库仑阻塞现象，与用正统模型计算的理论曲线一致。源极与金铁心之间（R1和C1）和漏极与金铁心之间（R2和C2）的双势垒隧道结的电阻和电容分别为4.5 MΩ、1.4 aF、4.8 MΩ和1.3 aF。这是通过拟合理论曲线与实验库仑阶梯来确定的。在C8S2/己硫醇（C6S）混合自组装层中，两亚甲基短辛二硫醇（C8S2）在化学锚定了金纳米粒子在化学镀金纳米电极之间两端的核心，即使金纳米粒子被十硫醇（C10S）保护。这是因为R1值与R2值相同，并且对应于辛二硫醇与Au核心和Au电极化学键合的隧穿电阻。本文还讨论了库仑钻石形状与隧道电阻比（R1/R2）的关系，特别是菱形库仑钻石。菱形库仑钻石是由化学锚定的金纳米粒子的核心在两端的化学镀金纳米电极之间产生的。
Rhombic Coulomb diamonds are clearly observed in a chemically anchored Au nanoparticle single-electron transistor. The stability diagrams show stable Coulomb blockade phenomena and agree with the theoretical curve calculated using the orthodox model. The resistances and capacitances of the double-barrier tunneling junctions between the source electrode and the Au core (R1 and C1, respectively), and those between the Au core and the drain electrode (R2 and C2, respectively), are evaluated as 4.5 MΩ, 1.4 aF, 4.8 MΩ, and 1.3 aF, respectively. This is determined by fitting the theoretical curve against the experimental Coulomb staircases. Two-methylene-group short octanedithiols (C8S2) in a C8S2/hexanethiol (C6S) mixed self-assembled monolayer is concluded to chemically anchor the core of the Au nanoparticle at both ends between the electroless-Au-plated nanogap electrodes even when the Au nanoparticle is protected by decanethiol (C10S). This is because the R1 value is identical to that of R2 and corresponds to the tunneling resistances of the octanedithiol chemically bonded with the Au core and the Au electrodes. The dependence of the Coulomb diamond shapes on the tunneling resistance ratio (R1/R2) is also discussed, especially in the case of the rhombic Coulomb diamonds. Rhombic Coulomb diamonds result from chemical anchoring of the core of the Au nanoparticle at both ends between the electroless-Au-plated nanogap electrodes.