Single molecule, one million times smaller than a grain of sand, pictured for first time
By
Claire Bates
Last updated at 7:39 PM on 28th August 2009
It may look like a piece of honeycomb, but this lattice-shaped image is the first ever close-up view of a single molecule.
Scientists from IBM used an atomic force microscope (AFM) to reveal the chemical bonds within a molecule.
'This is the first time that all the atoms in a molecule have been imaged,' lead researcher Leo Gross said.
The delicate inner structure of a pentacene molecule has been imaged with an atomic force microscope
The researchers focused on a single molecule of pentacene, which is
commonly used in solar cells. The rectangular-shaped organic molecule
is made up of 22 carbon atoms and 14 hydrogen atoms.
In the image above the hexagonal shapes of the five carbon rings are clear and even the positions of the hydrogen atoms around the carbon rings can be seen.
To give some perspective, the space between the carbon rings is only 0.14 nanometers across, which is roughly one million times smaller than the diameter of a grain of sand.
Textbook model: A computer-generated image of how we're used to seeing a molecule represented with balls and sticks
'If you think about how a doctor uses an X-ray to image bones and organs inside the human body, we are using the atomic force microscope to image the atomic structures that are the backbones of individual molecules,' said IBM researcher Gerhard Meyer.
A 3D view showing how a single carbon monoxide molecule was used to create the image using a 'tuning fork' effect
The team from IBM Research Zurich said the results could have a huge impact of the field of nanotechnology, which seeks to understand and control some of the smallest objects known to mankind.
The
AFM uses a sharp metal tip that acts like a tuning fork to measure the
tiny forces between the tip and the molecule. This requires great
precision as the tip moves within a nanometer of the sample.
'Above the skeleton of the molecular backbone (of the pentacene) you get a different detuning than above the surface the molecule is lying on,' Mr Gross said.
This detuning is then measured and converted into an image.
To stop the tip from absorbing the pentacene molecule, the researchers replaced the metal with a single molecule of carbon monoxide. This was found to be more stable and created weaker electrostatic attractions with the pentacene, creating a higher resolution image.
IBM researchers Nikolaj Moll, Reto Schlittler, Gerhard Meyer, Fabian Mohn and Leo Gross (l-r) stand behind an atomic force microscope Photo taken by Michael Lowry Image courtesy of IBM Research - Zurich
The experiment was also performed inside a high vacuum at the extremely cold temperature of -268C to avoid stray gas molecules or atomic vibrations from affecting the measurements.
'Eventually we want to investigate using molecules for molecular electronics,' Mr Gross said.
'We want to use molecules as wires or logic switches or elements.'
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This may be the first AFM image of a single discrete molecule but images of single atoms and lattice structures have been around for some time. I studied UHV x-ray and photoelectron techniques in grad school.
Regarding all the comments about religion, you people are ignorant as this merely shows that the Universe operates under specific laws and symmetries. It says nothing of the existance (or non-existance) of a higher power. Quit trying to justify your beliefs through science you do not even understand.
- Mike, Melbourne, FL USA, 30/8/2009 23:52
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