Gap separation-controlled nanogap electrodes by molecular ruler electroless gold plating

We introduce an electroless gold plating technique which we term molecular ruler electroless plating, which more precisely controls the separation of the nanogap electrodes

Victor M. Serdio V

2015

Scholarcy highlights

  • As the sizes of nanodevice features decrease to a few nanometers, the integration of functional components into macroscopic electronic circuits presents formidable challenges. Bottom-up processes have been implemented to connect traditional top-down processes in order to utilize molecules and nanoparticles with speci c functions such as negative differential resistance, recti cation, memory effects, and single-electron phenomena. Nanogap electrodes are promising platform for nanodevices because the single nanometersized components can be directly wired between the electrodes in the approach toward solid-state nanodevices. Several fabrication techniques for nanogap electrodes have been studied: mechanically controllable break junctions, electromigration, oblique metal evaporation with shadow masks, electron beam lithography, and electrochemical methods.21,22For practical application, nanogap electrodes must be fabricated simultaneously with high precision. Electroless plating is a promising technique for the fabrication of integrated nanogap electrodes. Recently, we established the electroless gold plating technique for the mass production of the robust nanogap electrodes with gap separations of 5 nm or less in 90% yield. This ELGP technique is based on a surface-catalyzed
  • We introduce an ELGP technique which we term molecular ruler electroless plating, which more precisely controls the separation of the nanogap electrodes
  • Paper nanogap separations in the ELGP processes are precisely ruled by the interdigitation of the surfactant molecules as shown in Fig. 7b, this ELGP process should be named as molecular ruler electroless plating
  • A gold layer grows over the electrode surface during MoREP, and the narrowing gap separation was self-terminated based on the interdigitation of the surfactant molecules between the electrodes
  • As the gap separation was correlated to the length of the alkyl chain, it can be controlled between 2.5 Æ 0.6 and 3.3 Æ 0.8 nm by choosing the alkyl chain length of the surfactant molecules
  • A chemically-assembled double-gate single-electron transistor was fabricated to demonstrate the usability of the MoREP nanogap electrodes, which exhibit ideal, stable, and reproducible Coulomb diamonds
  • molecular ruler electroless plating, with the ability to control nanogap separations with standard deviations of less than one nanometer, allows us to prepare made-to-order nanogap electrodes by adjusting gap separations to the sizes of the nanoparticles and functional molecules, for the fabrication of ideal single nanoscale solid state devices

Need more features? Save interactive summary cards to your Scholarcy Library.