Fabrication of self-assembled monolayer using carbon nanotubes conjugated 1-aminoundecanethiol on gold substrates

Mohammed M Rahman

doi:10.4236/ns.2011.33027

Abstract

The carbon nanotube (fundamentally Single- walled carbon nanotube, SWCNT) based on 1-Amino-undecanethiol (AUT) were extremely controlled (nano-level) organizing a vertical self-assembled monolayer (SAM) on gold single crystal surfaces. The produced nano-surfaces were explored particularly by Fourier Transform Infra-red Spectroscopy (FT-IR), Cyclic Voltammetry (CV), Raman spectroscopy, Electrochemi- cal quartz crystal microbalance (EQCM), and Atomic force microscopy (AFM) techniques. The SWCNTs were initially cut (chemically) into short pipes and thiol-derivatized at the open ends. The vertical aggregation of SWCNT-AUTs on chemically refined Au(111) substrates was made-up by their spontaneous chemical bonding among carboxyl derivatized SWCNT-COOH and AUT SAM on Au(111), via peptide bonds, or directly by synthesized SWCNT-AUT composites. Raman spectroscopy and AFM surface images obviously disclosed that the SWCNT- AUT (dia. 20~40 nm) has been vertically categorized d on gold (111) substrates, shaping a SAM with a perpendicular direction.

Highlights

Carbon nanotubes (CNTs) have appeared as an attracting new category of electronic materials owing to their nano-scale dimensions and exceptional properties, which comprise the capability to conduct a current density three orders of degree higher than distinctive conductors, such as copper and aluminium and the aptitude to conduct electrons statically
The single crystal gold substrate is first modified with AUT self-assembled monolayer completed by amino groups
A chemical approach was place onward to categorize and organize the arbitrarily chemisorbed SWCNT-AUT self-assembled monolayer (SAM) on a Au(111) substrate. From all of these experimental scrutinies, it is confirmed that the thiol-derivatized SWCNT-AUT have been effectively immobilized on Au(111) via Au-S chemical bonding, with the nanotubes being vertically aggregated and standing on the gold surfaces

Summary

Introduction

Carbon nanotubes (CNTs) have appeared as an attracting new category of electronic materials owing to their nano-scale dimensions and exceptional properties, which comprise the capability to conduct a current density three orders of degree higher than distinctive conductors, such as copper and aluminium and the aptitude to conduct electrons statically. Since the innovation of carbon nanotubes by Iijima in 1991 by transmission electron microscopy, SWCNTs have been the topic of numerous investigations in chemical, physical, and material areas owing to their novel structural, mechanical, electronic, and chemical properties [2]. Depending on their atomic structure, SWCNTs act an electrically as a metal or as a semiconductor [3]. Self-assembly of a molecular monolayer onto a solid surface is an essential and technical way to build structurally controlled and stable organic thin films Many applications of this stable, closely packed monolayer on solid substrates have been examined, counting adhesion, lubrication, promotion, corrosion inhibition, and microelectronics production. The prospective use of SWCNT in electronic applications motivates research on their

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