Selective placement of carbon nanotubes via coulombic attraction of oppositely charged carbon nanotubes and self-assembled monolayers

Patent metadata

Field	Value
Publication number	US-2016137605-A1
Application number	US-201615001802-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Sep 29, 2011
Publication date	May 19, 2016
Grant date	—

Abstract

A method of forming a structure having selectively placed carbon nanotubes, a method of making charged carbon nanotubes, a bi-functional precursor, and a structure having a high density carbon nanotube layer with minimal bundling. Carbon nanotubes are selectively placed on a substrate having two regions. The first region has an isoelectric point exceeding the second region's isoelectric point. The substrate is immersed in a solution of a bi-functional precursor having anchoring and charged ends. The anchoring end bonds to the first region to form a self-assembled monolayer having a charged end. The substrate with charged monolayer is immersed in a solution of carbon nanotubes having an opposite charge to form a carbon nanotube layer on the self-assembled monolayer. The charged carbon nanotubes are made by functionalization or coating with an ionic surfactant.

First claim

What is claimed is:

1 . A bi-functional precursor molecule for making self-assembled monolayers, the molecule comprising:
a first functional group to anchor the monolayer to a substrate; and a second functional group having a first ionic charge moiety; wherein the first functional group is selected from the group consisting of a thiol, an isontrile, a phosphonic acid and a hydroxamic acid; and wherein the first ionic charge moiety is an onium salt selected from the group consisting of an ammonium salt, a sulfonium salt, and phosphonium salt.

2 . The bi-functional precursor molecule of claim 1 , wherein the self-assembled monolayer on the substrate contacts a plurality of carbon nanotubes (CNTs).

3 . The bi-functional precursor molecule of claim 1 , wherein the self-assembled monolayer on the substrate bonds to a second ionic charge moiety of a plurality of carbon nanotubes (CNTs).

4 . The bi-functional precursor molecule of claim 3 , wherein the first ionic charge moiety and the second ionic charge moiety are oppositely charged.

Assignees

• IBM

Inventors

• Afzali-Ardakani Ali
• Park Hongsik
• Tulevski George S

Classifications

• H10D62/122

  oriented at angles to substrates, e.g. perpendicular to substrates · CPC title

• C07D213/79 Primary

  Acids; Esters · CPC title

• H10K10/484

  characterised by the channel regions · CPC title

• H10K71/12

  using liquid deposition, e.g. spin coating · CPC title

• H10K85/225

  comprising substituents · CPC title