Invited Paper SP+SS+TF-WeM1
STM-Based Nanofabrication and Integrating Nanostructures with Clean Semiconductor Surfaces

Wednesday, November 1, 2017, 8:00 am, Room 10

Integrating 1D and 2D nanostructures with clean silicon and III-V semiconductor surfaces represents an interesting route towards future hybrid electronic systems. In this effort, we are exploring the integration of carbon nanotubes, graphene and graphene nanoribbons (GNRs) with clean semiconductor surfaces. A key challenge is the fabrication of ‘clean’ nanostructure-substrate systems. We have addressed this by developing a simple dry contact transfer (DCT) process that enables the deposition of nanostructures onto atomically clean surfaces in ultrahigh vacuum. STM imaging and spectroscopy, coupled with our atomic resolution STM-based hydrogen resist process have been used to study the interactions of carbon nanotubes, graphene and atomically precise graphene nanoribbons with silicon, GaAs and InAs substrates. In these experiments, we have observed the metallic zigzag edge state in graphene¹, carbon nanotube-substrate lattice alignment effects², and the electronic structure of GNRs³. This talk will also show a method for creating sub-5nm metal wires for contacting nanostructures⁴, a SPM probe sharpening technique for producing 1 nm radii probes⁵, and a technique for improving the electronic performance of carbon nanotube array transistors as well as the structural and thermal performance of CNT-based composite materials⁶.

References:

1. Ritter, K.; Lyding, J., The influence of edge structure on the electronic properties of graphene quantum dots and nanoribbons. Nature Materials 2009,8 (3), 235-242.

2. Ruppalt, L.; Lyding, J., Charge transfer between semiconducting carbon nanotubes and their doped GaAs(110) and InAs(110) substrates detected by scanning tunnelling spectroscopy. Nanotechnology 2007,18 (21).

3. Radocea, A.; Sun, T.; Vo, T.; Sinitskii, A.; Aluru, N.; Lyding, J., Solution-Synthesized Chevron Graphene Nanoribbons Exfoliated onto H:Si(100). Nano Letters 2017,17 (1), 170-178.

4. Ye, W.; Martin, P. A. P.; Kumar, N.; Daly, S. R.; Rockett, A. A.; Abelson, J. R.; Girolami, G. S.; Lyding, J. W., Direct Writing of Sub-5 nm Hafnium Diboride Metallic Nanostructures. Acs Nano 2010,4 (11), 6818-6824.

5. Schmucker, S.; Kumar, N.; Abelson, J.; Daly, S.; Girolami, G.; Bischof, M.; Jaeger, D.; Reidy, R.; Gorman, B.; Alexander, J.; Ballard, J.; Randall, J.; Lyding, J., Field-directed sputter sharpening for tailored probe materials and atomic-scale lithography. Nature Communications 2012,3.

6. Do, J.; Estrada, D.; Xie, X.; Chang, N.; Mallek, J.; Girolami, G.; Rogers, J.; Pop, E.; Lyding, J., Nanosoldering Carbon Nanotube Junctions by Local Chemical Vapor Deposition for Improved Device Performance. Nano Letters 2013,13 (12), 5844-5850.