Characterization of thiol-functionalized oligo(phenylene-ethynylene)-protected Au nanoparticles by scanning tunneling microscopy and spectroscopy
Characterization of thiol-functionalized oligo(phenylene-ethynylene)-protected Au nanoparticles by scanning tunneling microscopy and spectroscopy
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DOI：
10.1063/1.4747720
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发表时间：
2012-08
影响因子：
4
通讯作者：
Hyunmo Koo;S. Kano;Daisuke Tanaka;M. Sakamoto;T. Teranishi;Gyoujin Cho;Y. Majima
中科院分区：
文献类型：
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作者：
Hyunmo Koo;S. Kano;Daisuke Tanaka;M. Sakamoto;T. Teranishi;Gyoujin Cho;Y. Majima
通过扫描隧道显微镜 (STM) 和扫描隧道光谱 (STS) 研究了硫醇官能化低聚亚苯基乙炔基 (OPE)、1,4-双-(3-巯基苯基乙炔基)苯保护的金纳米颗粒的电性能。 Au(111)表面化学吸附OPE保护的Au纳米粒子的STM和扫描电子显微镜图像相似，并且密度几乎相同。 OPE 保护的金纳米粒子表现出随机电导切换行为，并且在 100 K 下通过 STS 测得的电流-电压 (I-V) 和对数 I-V 特性显示出库仑阻断行为。当核直径为2.1 nm时，Au纳米颗粒的充电能量高达0.57 eV。我们的结果对于单电子晶体管存储器应用具有重要意义。
The electrical properties of Au nanoparticles protected by thiol-functionalized oligo(phenylene-ethynylene) (OPE), 1,4-bis-(3-mercapto-phenylethynyl)benzene have been investigated by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). The STM and scanning electron microscopy images of chemisorbed OPE-protected Au nanoparticles on Au(111) surface were similar, and the densities were almost identical. OPE-protected Au nanoparticles exhibited stochastic conductance switching behaviors, and current-voltage (I–V) and log I–V characteristics by STS at 100 K showed Coulomb blockade behaviors. The charging energy of Au nanoparticles was as high as 0.57 eV when the core diameter was 2.1 nm. Our results are significant for single-electron transistor memory applications.