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Breakthrough in X-Ray Nanospectroscopy

Berlin, December, 7th, 2011 — HZB researchers achieve X-ray spectroscopy at nanoscale spatial resolution Researchers at Helmholtz Zentrum Berlin (HZB) have developed a new microscope for high spatial resolution X-ray spectroscopic studies. While conventional X-ray spectroscopy has so far fallen short of resolving single nanoparticles, the X-ray microscope at HZB’s synchrotron source BESSY II succeeds by using high-brilliancy X-rays.

Indeed, one of the essential reasons for studying nanoparticles or nanostructures is to determine their individual sizes and electronic properties. To attain the necessary spatial resolution, down to the nanoscale, the structures have to be illuminated with X-rays at high spectral resolution and imaged onto a detector using an X-ray lens.

This picture schematically shows the studied titanium dioxide rods illuminated by X-rays of various photon energies through a capillary condenser. A high-resolution lens – not shown here – then forms an image of the objects. Source: HZB

Dr. Peter Guttmann and the microscopy team of PD Dr. Gerd Schneider at the HZB Institute for Soft Matter and Functional Materials have published the new method in Nature Photonics (DOI: 10.1038/NPHOTON.20111268).

There is great interest in the electronic properties of nanostructures, which can be functionalized in all kinds of ways, for example as active materials with a large surface area and small volume. Conceivable uses are in lithium-ion batteries, for example, or in photocatalysis to produce hydrogen as an energy carrier, or in solar cells. The HZB microscope is a new and attractive tool for materials sciences, and for energy research in particular.

This method can take pictures of nanoparticles inside object fields of up to 20 x 20 µm2 simultaneously with a CCD camera. An object field of this size holds many structures of interest. By recording image data in very small energy steps over a select energy range, the researchers obtain records of high-spatial-resolution images with spectral information. This provides a spectrum of each individual particle or portion of the nanostructure. These NEXAFS spectra, as they are called, reveal information about the electronic structure and ultimately the arrangement of the individual atoms within the nanoparticle. Unlike scanning X-ray microscopy, which measures sequentially the spectra of single nanoparticles with each picture, an image stack from the new method already contains the spectra of a large number of particles, meaning it already has statistical significance.

“An important advantage of our microscope is the time gain on top of the improved spectral resolution of 10,000,” says Dr. Peter Guttmann, physicist at HZB. “Unlike the scanning X-ray microscopes used so far for this, our microscope allow spectra to be recorded 100 times faster inside large object fields. We can use the HZB electron beam writer to produce advanced lenses that will improve our method from the current 25 nm to a spatial resolution of 10 nm.”

At the high spatial and spectral resolution of the microscope, the researchers cooperated with co-authors from Belgium, France and Slovenia to study the structure of specially built titanium dioxide nanorods. The nanorod studies they now present were done as a European cooperative as part of the COST action MP0901(NanoTP).

The Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) operates and develops large scale facilities for research with photons (synchrotron beams) and neutrons. The experimental facilities, some of which are unique, are used annually by more than 2,500 guest researchers from universities and other research organisations worldwide. Above all, HZB is known for the unique sample environments that can be created (high magnetic fields, low temperatures). HZB conducts materials research on themes that especially benefit from and are suited to large scale facilities. Research topics include magnetic materials and functional materials. In the research focus area of solar energy, the development of thin film solar cells is a priority, whilst chemical fuels from sunlight are also a vital research theme. HZB has approx.1,100 employees of whom some 800 work on the Lise-Meitner Campus in Wannsee and300 on the Wilhelm-Conrad-Röntgen Campus in Adlershof.

HZB is a member of the Helmholtz Association of German Research Centres, the largest scientific organisation in Germany.

Further information:
Dr. Peter Guttmann
Institute for Soft Matter and Functional Materials
Fon +49 30 8062-14749
peter.guttmann@helmholtzberlin.de

PD Dr. Gerd Schneider
Institute for Soft Matter and Functional Materials
Fon +49 30 8062-13131
gerd.schneider@helmholtzberlin.de

www.helmholtz-berlin.de

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