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Research lines at the Surface Science Group of the UCM
Juan M. Rojo Miguel Ángel González Arantzazu Mascaraque
Oscar Rodríguez Manuel Abuín Beatriz MarDnez Jesús López
Surface Science Group Departamento de Física de Materiales
Facultad de CC. Físicas Universidad Complutense de Madrid
www.ucm.es/centros/webs/SurfaceScience
Surface Science Why is Surface Science important in Materials Science?
Nanoscience (high surface/volume raOo) Surface phenomena (catalysis, fricOon…)
Experimental techniques at the Surface Science Group
Electronic structure
Experimental technique: Angle resolved photoemission
Phase transiOons
Electron correlaOon Dimensionality of electronic states
Molecule/surface interfaces
Study of the Fermi surface
e-‐ hν
Electronic structure, band structure A. Mascaraque, Rocío Cortés, now at Brookhaven NaOonal Laboratory. STM, ARPES.
Au(100) Fermi surface
3.0nm
H and P phases of DCS/Cu(110)
Gap opening in the Mo` transiOon in Sn/Ge(111)
Electronic structure
Nanomechanics Incipient plasOcity, influence of surface defects Violeta Navarro, now at Leiden InsOtute of Physics, Netherlands. AFM, MD simulaOons
Phys. Rev. Le`. 100, 105504 (2008)
TiO2(110)
Phys. Rev. B. 78, 224107 (2008)
Nanomechanics Void growth in 2D solids under applied stress in collaboraOon with Javier Segurado, Hyung-‐Jun Chang and Javier Llorca, From the Universidad Politécnica de Madrid, E.T.S. de Ingenieros de Caminos MD atomisOc simulaOons
Chemical reac@vity Methanol adsorpOon on defecOve surfaces (Ru(0001)) Irene Palacio (now at Soleil sinchrotron, Paris) Standard UHV techniques, IRAS spectroscopy
5.4 L
2.2x105 L
H2CO HCO CO
(O2+CH3OH)/Ru(0001) flat surface (O2+CH3OH)/Ru(0001) defec@ve surface
CH3O HCOO CO 5.4 L
1.4x104 L
wavenumber (cm-‐1) wavenumber (cm-‐1)
Surface Science 606, 1152 (2012) ChemPhysChem 13, 2354 (2012)
Chemical reac@vity Methanol adsorpOon on defecOve surfaces (Ru(0001)) Irene Palacio (now at Soleil sinchrotron, Paris) Standard UHV techniques, IRAS spectroscopy
Chemical reac@vity Water adsorpOon on modified TiO2 surfaces PhD doctoral thesis of Beatriz MarDnez Standard UHV techniques, contact angle measurement
FLAT SURFACE ION-‐BOMBARDED SURFACE
Chemical reac@vity Water adsorpOon on modified TiO2 surfaces PhD doctoral thesis of Beatriz MarDnez Standard UHV techniques, contact angle measurement
O KLL
Ti LMV
Ti LMM
ion-‐bombarded
flat
AUGER ELECTRON SPECTROSCOPY: PREFERENTIAL SPUTTERING OF OXYGEN AND REDUCTION OF THE Ti CATIONS
Chemical reac@vity
Ion bombarded region Flat region
Water adsorpOon on modified TiO2 surfaces PhD doctoral thesis of Beatriz MarDnez Standard UHV techniques, contact angle measurement
Chemical reac@vity
Bombarded region
Flat region
Ion bombarded region Flat region
Water adsorpOon on modified TiO2 surfaces PhD doctoral thesis of Beatriz MarDnez Standard UHV techniques, contact angle measurement
Proyecto: Películas delgadas para electrónica basadas en óxidos: crecimiento, defectos y magne@smo (MAT-‐2012-‐38045-‐C04-‐02)
Substrate
Sol-gel (50-500nm)
FexOy
• cheap and versaOle method • high purity and homogeneity • low producOon cost
Growth of thin films by sol-‐gel Thin films with nanoparOcles of iron oxides Jesús López, Noemí Carmona, Departamento de Física de Materiales, UCM J. de la Figuera, J. Marco, M. MonO, IQF Rocasolano, CSIC. Sol-‐gel growth, AFM, XRD, Mössbauer spectroscopy
Growth of thin films by sol-‐gel Thin films with nanoparOcles of iron oxides Jesús López, Noemí Carmona, Departamento de Física de Materiales, UCM J. de la Figuera, J. Marco, M. MonO, IQF Rocasolano, CSIC. Sol-‐gel growth, AFM, XRD, Mössbauer spectroscopy
Mössbauer spectroscopy
Au nanostructures Thin films and nanostructures of Au In collaboraOon with Aída Serrano and M.A. García, InsOtuto de Cerámica y Vidrio, CSIC. Surface Plasmon Resonance, OAS, AFM, XAS
Extended plasmon Localized plasmon
Au thin films and nanoparOcles
Au and FexOy nanoparOcles Phase contrast AFM
AFM MicroRaman
J. Appl. Phys. . Rev. B. 108, 074303 (2010)
Au nanostructures
Development of an experimental setup at SpLine, ESRF synchrotron in collaboraOon with G. Castro. Simultaneous XAS and SPR
Rev. Sci. Instr. 83, 083101 (2012)
Main objec+ve: fabrica@on and study of trilayer thin films FeCo/Au/FeCo or Fe3O4/Au/Fe3O4 for biomedical applica@ons
Dong-‐Hyun Kim, et al., Nature Materials (2009)
Mo@va@ons of this project:
Magne@c nanostructures Growth and characterizaOon of magneOc heterostructures (nanoribbons) In collaboraOon with UPM-‐ISOM (M. Maicas), PhD doctoral thesis of Manuel Abuín Spu`ering, VSM…
Hc1 Hc2
Hc1 > Hc2 10-‐20nm (magne@c layer) ∼2-‐5nm (no magne@c layer)
Low remanence
Micro/Nano-‐rotators
RaOo 1:10