Research conducted by H. Liu, Y. Lin, D.F. Ogletree, and M. Salmeron (Berkeley Lab); J. Guo (ALS); A. Augustsson (ALS and Uppsala University, Sweden); C. Dong (ALS and Tamkang University, Taiwan); J. Nordgren (Uppsala University, Sweden); C. Chang (Tamkang University, Taiwan); P. Alivisatos (Berkeley Lab and University of California, Berkeley); G. Thornton (University College London); F.G. Requejo (Universidad Nacional de La Plata, Argentina); and F. de Groot (Utrecht University, The Netherlands).

Research funding: U.S. Department of Energy, Office of Basic Energy Sciences (BES). Operation of the ALS is supported by BES.

Publication about this research: H. Liu, J. Guo, Y. Yin, A. Augustsson, C. Dong, J. Nordgren, C. Chang, P. Alivisatos, G. Thornton, D.F. Ogletree, F.G. Requejo, F. de Groot, and M. Salmeron, "Electronic structure of cobalt nanocrystals suspended in liquid," Nano Lett. 7, 1919 (2007).

Top: Illustration of a colloidal nanocrystal with a cobalt center surrounded by a ligand layer made up of molecules of an organic surfactant (oleic acid).

Bottom: Transmission electron microscope (TEM) image of cobalt nanocrystals.

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Left:The most notable feature in the spectra of the Co nanocrystals (red curves) is the absorption peak (A2) about 6 eV above the main absorption edge (A1) that is absent in the reference spectra for Co3O4, CoO, CoCl2, and Co metal (blue).Right:Illustration of MLCT transitions between cobalt and the oleic acid or 1,2-dichlorobezene

Featured ResultsDissociative hydrogen adsorption on palladium requires aggregates of three or more vacancies
T. Mitsui, M.K. Rose, E. Fomin, D.F. Ogletree, and M. Salmeron
Nature. 422, 705 (2003). LBNL-52007

Would you like to see surface dynamics in real space?

Watch STM movies here!

Monte Carlo simulations of hydrogen vacancy diffusion and aggregation in a 1x1 layer of hydrogen on Pd(111)

can be found here.

Hydrogen vacancies diffusion and cluster formation on Pd(111)

Nature 422, 705 (2003)

Recent works

-Water diffusion and clustering on Pd(111)
T. Mitsui, M.K. Rose, E. Fomin, D. Frank Ogletree and M. Salmeron
Science. 297, 1850 (2002). LBNL-49965

-Dissociative hydrogen adsorption on palladium requires aggregates of three or more vacancies
T. Mitsui, M.K. Rose, E. Fomin, D.F. Ogletree, and M. Salmeron
Nature. 422, 705 (2003). LBNL-52007

-The interaction of water with self-assembled monolayers of alkylsilanes on mica
I. Díez, M. Luna, F. Teheran, D.F. Ogletree, F. Sanz, and Miquel Salmeron
Langmuir 20, (4) 1284 (2004). LBNL-53566

-High Frictional Anisotropy of Periodic and Aperiodic Directions on a Quasicrystal Surface
J.Y. Park, D.F. Ogletree, M. Salmeron, R.A. Ribeiro, P.C. Canfield, C.J. Jenks and P.A. Thiel
Science. 309, 1354 (2005). LBNL-58558

-Hydrogen and deuterium exchange on Pt(111) and its poisoning by carbon monoxide studied by surface sensitive high-pressure techniques
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J. Am. Chem. Soc. 128, (40) 13231 (2006) LBNL-60270

-Electronic structure of cobalt nanocrystals suspended in liquid
Hongjian Liu, Jinghua Guo, Yadong Yin, Andreas Augustsson, Chungli Dong, Joseph Nordgren, Chinglin Chang, Paul Alivisatos, Geoff Thornton, D. Frank Ogletree, Felix G. Requejo, Frank de Groot, Miquel Salmeron
Nanoletters 7, 1919-1922 (2007) LBNL- 63188

-Autocatalytic water dissociation on Cu(110) at near ambient conditions
Klas Andersson, Guido Ketteler, Hendrik Bluhm, Susumu Yamamoto, Hirohito Ogasawara, Lars G. M. Pettersson, Miquel Salmeron, Anders Nilsson
J. Am. Chem. Soc. 130, 2793 (2008)   LBNL-99E

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