Improved electrophoretic deposition of vertical single wall carbon nanotubes with nanoscopic electrostatic lenses

Shanmugamurthy Lakshmanan, Alokik Kanwal, Sheng Liu, Anitha Patlolla, Zafar Iqbal, Somenath Mitra, Gordon A. Thomas, Jeffrey A. Fagan, Reginald C. Farrow

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Under certain conditions, electrophoretic deposition (EPD) of single-wall carbon nanotubes (SWCNTs) onto metal at the base of nanoscale insulating windows can result in a single SWCNT per window, bonded at one end to the metal. During EPD charge, buildup on the insulator creates electrostatic lenses at the windows that control the trajectory of the SWCNTs. The aim is to develop a reproducible process for deposition of individual vertically oriented SWCNTs into each window to enable novel devices. The length of the SWCNTs is shown to be the most critical parameter in achieving results that could be used for devices. In particular, single nanotube deposition in windows by EPD was achieved with SWCNTs with lengths on the order of the window depth. By performing current vs voltage (IV) measurements against a platinum wire in a phosphate buffer and by modeling the data, the presence of the nanotube can be detected, the contact interface can be studied, and the nanotube's viability for device applications can be determined. These results provide a basis for process integration of vertical SWCNTs using EPD.

Original languageEnglish (US)
Article number324
JournalMicromachines
Volume11
Issue number3
DOIs
StatePublished - Mar 1 2020

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Keywords

  • Carbon nanotubes
  • Electrophoretic deposition
  • Nanoprobe arrays
  • Nanoscopic electrostatic lens
  • Raman spectroscopy
  • Vertical carbon nanotubes
  • Zeta potential

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