Related Experiment Video
Updated: Jul 16, 2026
08:07
Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
Published on: June 18, 2013
Towards molecular electronic devices based on 'all-carbon' wires
Andrea Moneo1, Alejandro González-Orive2, Sören Bock3
1Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, 50009, Spain. agorive@mail.upb.de pilarce@unizar.es smartins@unizar.es.
Nanoscale
|July 13, 2018
Summary
Researchers developed novel molecular electronic devices using all-carbon wires. These devices, fabricated by sequentially cleaving trimethylsilyl groups from an oligoyne on gold electrodes, show promising electrical properties for future nanoelectronics.
Area of Science:
- Materials Science
- Nanotechnology
- Molecular Electronics
Background:
- Development of stable and reliable molecular electronic devices is crucial for advancing nanoelectronics.
- Carbon-based molecular wires offer unique electronic properties and structural robustness.
- Formation of strong metal-carbon contacts is essential for device performance.
Purpose of the Study:
- To fabricate nascent molecular electronic devices using linear all-carbon wires.
- To establish robust C-Au contacts for molecular electronic applications.
- To characterize the electrical properties of metal-monolayer-metal devices.
Main Methods:
- Sequential cleavage of trimethylsilyl (TMS) end groups from an oligoyne (Me3Si-(C≡C)4-SiMe3) on a gold substrate.
- Formation of a self-assembled monolayer via fluoride-driven deprotection.
- Functionalization of the monolayer with a redox probe or gold nanoparticles (GNPs) to create metal-monolayer-metal junctions.
- Characterization using surface-enhanced Raman scattering (SERS) and electrochemical methods.
Main Results:
- Successfully prepared ordered monolayers of all-carbon wires (Au|C8SiMe3 and Au|C8H) on gold electrodes.
- Demonstrated covalent attachment of gold nanoparticles (GNPs) to form Au|C8|GNP devices.
- Confirmed the integrity of the carbon chain and C-Au contacts using SERS and electrochemistry.
- Observed sigmoidal current-voltage (I-V) curves in Au|C8|GNP devices, indicating well-behaved junctions.
Conclusions:
- A reliable method for fabricating molecular electronic devices with all-carbon wires and robust C-Au contacts was established.
- The synthesized metal-monolayer-metal devices exhibit promising electrical characteristics suitable for nanoelectronic applications.
- This work provides a foundation for designing and constructing advanced molecular electronic components.
Related Concept Videos
01:27Magnetic Field Due To A Thin Straight Wire
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
01:18Magnetic Field Due to Two Straight Wires
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
01:20Types of Semiconductors
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:28Electrochemical Cells
Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...