X-ray absorption and photoemission spectroscopy of zinc-protoporphyrin adsorbed on rutile TiO2110) prepared by in situ electrospray deposition
A. Rienzo et al, J. Chem. Phys. (2010)
Feb 2010 | Publications
In this experiment we used UHV electrospray deposition to grow thin films of a biological porphyrin molecule on atomically clean titanium dioxide surfaces. Porphyrins are potentially very useful molecules because other molecules can often bind to the central metal ion, and in doing so induce subtle changes in the electronic structure of the porphyrin. The idea behind this experiment was to build the beginnings of a molecular sensing surface. What we found was a very interesting coverage dependent orientation of the molecules on the surface - at very low coverage they lie flat but close to a complete monolayer they stand more upright. In principle this effect could be tuned to set the molecules at a specific angle to the surface overall. We also found that the interaction with the oxide surface at low coverage is sufficient to pull the metal atom out of the porphyrin molecule in some cases.
X-ray absorption and photoemission spectroscopy of zinc-protoporphyrin adsorbed on rutile TiO2110) prepared by in situ electrospray deposition
A. Rienzo et al, J. Chem. Phys. 132, 084703 (2010)
Feb 2010 | Publications | coming soon
Adsorption of PTCDI on Au(111): photoemission and scanning tunneling microscopy
J. N. O'Shea et al,
Surf. Sci. 603, 3094 (2009)
Sep 2009 | Publications | pdf
Adsorption of a Ru(II) dye complex on the Au(111) surface: Photoemission
and scanning tunneling microscopy
L. C. Mayor et al,
J. Chem. Phys. 130 164704 (2009)
May 2009 | Publications | pdf
Photoemission, resonant photoemission and X-ray absorption of a
Ru(II) complex adsorbed on rutile TiO2(110) prepared by in situ
electrospray deposition
L. C. Mayor et al,
J. Chem. Phys. 129, 114701 (2008)
September 2008 | Publications | pdf
Electrospray Deposition of C60 on a Hydrogen-Bonded Supramolecular Network
A. Saywell et al,
J. Phys. Chem. C 112, 7706 (2008)
May 2008 | Publications | pdf
Molecular damage in bi-isonicotinic acid adsorbed on rutile TiO2(110)
J. N. O'Shea et al,
Surf. Sci. 602, 1693 (2008)
May 2008 | Publications | pdf
Electrospray deposition of fullerenes in ultra-high vacuum: in situ scanning tunneling microscopy and photoemission spectroscopy
C. J Satterley et al,
Nanotechnology 18, 455304 (2007)
October 2007 | Publications | pdf
Charge-Transfer Dynamics at Model Metal-Organic Solar Cell Surfaces
J. B. Taylor et al,
J. Phys. Chem. C, 111, 16646 (2007)
October 2007 | Publications | pdf
Adsorption and charge transfer dynamics of bi-isonicotinic acid on Au(111)
J. B. Taylor et al,
J. Chem. Phys. 127, 134707 (2007)
October 2007 | Publications | pdf
Bulk electronic structure of K3C60 as revealed by soft x-rays
T. Käämbre et al,
Phys. Rev. B 75, 195432 (2007)
May 2007 | Publications | pdf
Electrospray deposition of carbon nanotubes in vacuum
J. N. O'Shea et al,
Nanotechnology 18, 035707 (2007)
January 2007 | Publications | pdf
Electrospray deposition in vacuum
J. C. Swarbrick et al,
Appl. Surf. Sci. 252, 5622 (2006)
May 2006 | Publications | pdf
Intramolecular vibronic dynamics in molecular solids: C60
L. Kjeldgaard et al,
Phys. Rev. B 72, 205414 (2005)
May 2006 | Publications | pdf
Phase and molecular orientation in metal-free phthalocyanine films on conducting glass: Characterization of two deposition methods
Y. Alfredsson et al,
Thin Solid Films 493, 13 (2005)
May 2006 | Publications | pdf
Molecular orbitals tell the story
J. N. O'Shea,
Science 310, 453 (2005)
October 2005 | Publications | pdf
(C6H5)5C60H at Si(111)-(7x7) and Ag : Si(111)-(√3 x √3)R30° surfaces
M. A. Phillips et al,
Phys. Rev. B 72, 075426 (2005)
August 2005 | Publications | pdf
Square, Hexagonal and Row Phases of PTCDA and PTCDI on Ag-Si(111) √3 x √3 R 30°
J. C. Swarbrick et al,
J. Phys. Chem. B 109, (2005)
May 2005 | Publications | pdf
Bulk and surface charge states of K3C60
J. Schiessling et al,
Phys. Rev. B 71, 165420 (2005)
April 2005 | Publications | pdf
Molecular ordering in isonicotinic acid on rutile TiO2(110) investigated with valence band photoemission
J. N. O'Shea et al,
J. Chem. Phys. 121, 10203 (2004)
November 2004 | Publications | pdf
Insulating surface layer on single crystal K3C60
J. Schiessling et al,
Eur. Phys. J B 41, 435 (2004)
October 2004 | Publications | pdf
X-ray photoelectron spectroscopy of fluorescein adsorbed on model solar-cell surfaces
J. N. O'Shea et al,
Surf. Sci. 548, 317 (2004)
November 2003 | Publications | pdf
Competing interactions of noble metals and fullerenes with the Si(111)7×7 surface
J. N. O'Shea et al,
J. Chem. Phys. 119, 13046 (2003)
December 2003 | Publications | pdf
Excited-state charge transfer dynamics in systems of aromatic adsorbates on TiO2 studied with resonant core tenchniques
J. Schnadt et al,
J. Chem. Phys. 119, 12462 (2003)
December 2003 | Publications | pdf
Structural study of adsorption of isonicotinic acid and related molecules on rutile TiO2(110) II: XPS
J. Schnadt et al,
Surf. Sci. 544, 74 (2003)
October 2003 | Publications | pdf
Structural study of adsorption of isonicotinic acid and related molecules on rutile TiO2(110) I: XAS and STM
J. Schnadt et al,
Surf. Sci. 540, 39 (2003)
August 2003 | Publications | pdf
Alignment of valence photoemission, x-ray absorption, and substrate density of states for an adsorbate on a semiconductor surface
J. Schnadt et al,
Phys. Rev. B 67, 235420 (2003)
June 2003 | Publications | pdf
Experimental evidence for sub-3-fs charge transfer from an aromatic adsorbate to a semiconductor
J. Schnadt et al,
Nature 418, 620 (2002)
August 2002 | Publications | pdf
Colloidal particle foams: Templates for Au nanowire networks?
J. N. O'Shea et al,
App. Phys. Lett. 81, 5039 (2002)
May 2002 | Publications | pdf
Angle-dependent valence photoemission study of pure phase K3C60
J. Schiessling et al,
AIP Conf. Proc., 591, 131 (2001)
December 2001 | Publications | pdf
Beamline-induced chromium structure in carbon K-edge absorption spectra
J. Schnadt et al,
Nucl. Instr. And Meth. In Phys. Res. B. 184, 609 (2001)
December 2001 | Publications | pdf
Hydrogen-bond induced surface core-level shift in pyridinecarboxylic acids
J. N. O'Shea et al, Surf. Sci. 486, 157 (2001)
December 2001 | Publications | pdf
Hydrogen-bond induced surface core-level shift in isonicotinic acid
J. N. O'Shea et al,
J. Phys. Chem. 105, 1917 (2001)
December 2001 | Publications | pdf
Oxidation states at alkali-metal-doped Ni(110)-O surfaces
A. F. Carley et al,
Phys. Chem. Chem. Phys. 3, 274 (2001)
May 2001 | Publications | pdf
X-ray photoelectron spectroscopy of low surface concentration mass-selected Ag clusters
J. N. O’Shea et al,
J. Chem. Phys. 113, 9233 (2000)
May 2000 | Publications | pdf
N1s x-ray absorption study of the bonding interaction of bi-isonicotinic acid adsorbed on rutile TiO2(110)
P. Persson et al,
J. Chem. Phys. 112, 3945 (2000)
May 2000 | Publications | pdf
Alkali metal reactions with Ni(110)–O and NiO(100) surfaces
A. F. Carley et al,
Surf. Sci. 454–456, 141 (2000)
May 2000 | Publications | pdf
The formation and characterisation of Ni3+, an X-ray photoelectron spectroscopic investigation of potassium-doped Ni(110)–O
A. F. Carley et al,
Surf. Sci. 440, L868 (1999)
May 1999 | Publications | pdf
Adsorption of PTCDI on Au(111): photoemission and scanning tunneling microscopy
J. N. O'Shea et al,Surf. Sci. (2009)
Sep 2009 | Publications
In addition to pushing the boundaries of surface science through the use of ultra-high vacuum electrospray deposition to enable the study of very large non-volatile molecules, we have also been using a combination of electron spectroscopy and scanning tunneling microscopy (STM) to gain complementary information on the molecular systems that we study. Core-level photoemission we usually carry out at national synchrotrons, while STM is usually performed back in the lab. This paper, however, presents the results of combingin STM and synchrotron-based photoemission in the same system. The experiments were performed at Beamline 6.1 at the SRS Daresbury shortly before its closure. The experiment tracks changes in the way that PTCDI molecules bond to a gold surface as a function of coverage. The photoemission tells us about the chemical bonds formed with the surface, while the STM shows how the layers of molecules grow.
Adsorption of a Ru(II) dye complex on the Au(111) surface: Photoemission
and scanning tunneling microscopy
L. C. Mayor et al,
J. Chem. Phys. 130, 164704 (2009)
May 2009 | Publications
Following on from the advances that we made in depositing the solar cell dye molecule N3 onto a titanium dioxide surface, here we present the results of the dye adsorbed on a gold surface. This is just more than stamp collecting. The idea is that the two different parts of the molecule bind preferentially to the different surfaces. The electron injection part - we showed in the last paper- likes to bond to the oxide, while the electron replinishing part - we show in this paper - likes to bond to the gold. This could form the basis of a very fast solid state dye-sensitised solar cell.
X-ray emission from dye molecules at Maxlab
November 2008 | Science
Our latest experiment to be conducted at the Swedish synchrotron facility Max II has enabled us to measure the x-ray emission from nitrogen atoms in the dye molecule N3 adsorbed on a titanium dioxide surface. By tuning the synchrotron radiation to resonantly excite N1s core electrons to different unoccupied molecular orbitals, we can disentangle the complex valence states of the molecule into the contributions from different ligands. Hopefully this data will give us a better insight into the electronic structure of the molecules used in dye-sensitised solar cells.
Photoemission, resonant photoemission and X-ray absorption of a
Ru(II) complex adsorbed on rutile TiO2(110) prepared by in situ
electrospray deposition
L. C. Mayor et al,
J. Chem. Phys. 129, 114701 (2008)
September 2008 | Publications
This publication in the Journal of Chemical Physics is something very special. What we've managed to do is to study the fragile non-volatile dye molecule N3 on a titanium dioxide surface using synchrotron-based photoelectron spectroscopy and the core-hole clock implementation of resonant photoemission. This represents the culmination of many years of work, both in the application of RPES to measure the transfer of electrons on the femtosecond timescale, and the deposition of fragile molecules under ultra-high vacuum conditions using electrospray ionisation. In this paper we show how the molecule is bound to the surface when deposited using this technique and that electrons excited to the lowest unoccupied molecular orbitals can tunnel into the empty states of the substrate in under 16fs. This goes some way to explaining why dye-sensitised solar cells based on this architecture are so efficient, and provides us with clues as to how to make them more efficient still.
Electrospray Deposition of C60 on a Hydrogen-Bonded Supramolecular Network
A. Saywell et al,
J. Phys. Chem. C 112, 7706 (2008)
May 2008 | Publications
As you can see from our recent work, we have been building towards the deposition of non-volatile molecules onto surfaces in ultra-high vacuum. Probably the most promising way of doing this is through electrospray deposition. This paper is part of a series of experiments using C60 as the adsorbate molecule. C60 can be sublimed as well as electrosprayed so it provides a nice platform for comparison of the two techniques. Here we demonstrate that by electrospraying C60 from a liquid solution under UHV conditions we can deposit the molecules into the hexaganol and rectangular pores of a self-assembled supramolecular network. The important thing is that the additional energy of the electrosprayed C60 molecules does not destroy the underlying (and weakly bonded) network. This opens the way for the deposition of a host of more complex non-volatile molecules into the pores of these networks, which we are working on at the moment.
Land Rover Discovery
January 2009 | Land Rover
The following resources will be of use to owners of series I Land Rover Discoveries, not least me.
ABS Blink Test for Discovery I and Range Rover
