Electrical Characterization of 4-Mercaptophenylamine-Capped Nanoparticles in a Heterometallic Nanoelectrode Gap

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• 作者：Ninet Babajani ; Peter Kowalzik ; Rainer Waser ; Melanie Homberger ; Corinna Kaulen ; Ulrich Simon ; Silvia Karth盲user
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 24, 2013
• 年：2013
• 卷：117
• 期：42
• 页码：22002-22009
• 全文大小：407K
• 年卷期：v.117,no.42(October 24, 2013)
• ISSN：1932-7455

文摘

One concept to build up hybrid electronic devices based on molecules or nanoparticles with rectifying properties is based on nanoscale objects that are immobilized between two electrodes composed of different metals forming asymmetric contacts. Following this concept, we introduce an optimized procedure to fabricate heterometallic nanoelectrodes with a separation of only 5 nm. Gold nanoparticles (AuNPs) with a diameter of 15 nm, stabilized with 4-mercaptophenylamine, were used to form electrode1-molecule/AuNP/molecule-electrode2 devices comprising at most a small number of AuNPs. Immobilization was performed by dielectrophoretic trapping. The molecular properties of 4-mercaptophenylamine are reflected in transition voltage spectroscopy features of the device. Cyclic current鈥搗oltage measurements on 20 functional devices revealed distinct differences in conductivities based on minor differences in device geometry. Analysis of the electron transport characteristics discloses that under these experimental conditions an asymmetric contact configuration alone is not sufficient for building up a molecule-based rectifier.