A molecular electronics toolbox

We are developing a 'toolbox' containing organic molecules, nanoparticles and carbon nanotubes (CNTs) that can be self-arranged into a very advanced information processing system. Before we can assemble these 'tools' in complex systems, it is imperative that we determine their physical, chemical and electrical properties. Here, we describe the development of three techniques to aid in evaluating the electrical properties of these 'tools'. Firstly, via a conducting atomic force microscope, we will examine a method of measuring the electrical properties of a single (few) dithiolated electronic molecule(s) inserted into an 'insulating' self-assembled monolayer (SAM). Secondly, to expedite the transport measurements of electronic molecules, we will present a hybrid assembly technique that consists of forming a SAM of the investigated molecule on pre-patterned electrodes and then bridging the electrodes with Au nanoparticles using an alternating electric field. Finally, to integrate single-wall carbon nanotubes into a circuit, we will outline a single optical lithographic step approach to pattern catalyst islands on top of metal electrodes. Then, reduced pressure chemical vapour deposition is performed on the patterned substrates to form CNTs bridging neighbouring electrodes and produce a circuit which is ready to test.