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Kanciurzewska, Anna
Publications (10 of 14) Show all publications
Bhatt, P., Kanciurzewska, A., Carlegrim, E., Kapilashrami, M., Belova, L., Rao, K. V. & Fahlman, M. (2009). Ferromagnetism above room temperature in nickel–tetracyanoethylene thin films. Journal of Materials Chemistry, 19(36), 6610-6615
Open this publication in new window or tab >>Ferromagnetism above room temperature in nickel–tetracyanoethylene thin films
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2009 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 19, no 36, p. 6610-6615Article in journal (Refereed) Published
Abstract [en]

Room temperature ferromagnetic ordering is reported in Ni–tetracyanoethylene (TCNE) thin films fabricated on Au substrates using physical vapor deposition (PVD) under ultra high vacuum conditions. This technique enables the preparation of very clean films without having any kind of contamination from oxygen-containing species, solvents or precursor molecules. Film stoichiometry was obtained from X-ray photoelectron spectroscopy (XPS) measurements. XPS derived stoichiometry points to a 1 : 2 ratio between Ni and TCNE resulting in Ni(TCNE)x, x ≈ 2. No evidence of pure Ni metal in the in situ grown films was present in the XPS or the ultraviolet photoelectron spectroscopy (UPS) measurements within the detection limits of the techniques.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-20594 (URN)10.1039/b900756c (DOI)
Available from: 2009-09-15 Created: 2009-09-15 Last updated: 2017-12-13
Carlegrim, E., Kanciurzewska, A., Nordblad, P. & Fahlman, M. (2008). Air-stable organic-based semiconducting room temperature thin film magnet for spintronics applications. Applied Physics Letters, 92(16), 163308
Open this publication in new window or tab >>Air-stable organic-based semiconducting room temperature thin film magnet for spintronics applications
2008 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 92, no 16, p. 163308-Article in journal (Refereed) Published
Abstract [en]

Herein, we report on a preparation method of vanadium tetracyanoethylene, V(TCNE)x, an organic-based semiconducting room temperature thin film magnet. Previously, this compound has been reported to be extremely air sensitive but this preparation method leads to V(TCNE)x, which can retain its magnetic ordering at least several weeks in air. The electronic structure has been studied by photoelectron spectroscopy and the magnetic properties by superconducting quantum interference device. The properties mentioned above, in combination with complete spin polarization, makes this air-stable V(TCNE)x a very promising material for spintronic devices.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-11869 (URN)10.1063/1.2916901 (DOI)
Note
Original publication: Elin Carlegrim, Anna Kanciurzewska, Per Nordblad and Mats Fahlman, Air-stable organic-based semiconducting room temperature thin film magnet for spintronics applications, 2008, Applied Physics Letters, (92), 163308. http://dx.doi.org/10.1063/1.2916901. Copyright: American Institute of Physics, http://apl.aip.org/apl/top.jspAvailable from: 2008-05-21 Created: 2008-05-21 Last updated: 2017-12-13
Salto, C., Saindon, E., Bolin, M., Kanciurzewska, A., Fahlman, M., Jager, E., . . . Berggren , M. (2008). Control of Neural Stem Cell Adhesion and Density by an Electronic Polymer Surface Switch. Langmuir, 24(24), 14133-14138
Open this publication in new window or tab >>Control of Neural Stem Cell Adhesion and Density by an Electronic Polymer Surface Switch
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2008 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 24, no 24, p. 14133-14138Article in journal (Refereed) Published
Abstract [en]

Adhesion is an essential parameter for stem cells. It regulates the overall cell density along the carrying surface, which further dictates the differentiation scheme of stem cells toward a more matured and specified population as well as tissue. Electronic control of the seeding density of neural stem cells (c17.2) is here reported. Thin electrode films of poly(3,4-ethylenedioxythiophene) (PEDOT):Tosylate were manufactured along the floor of cell growth dishes. As the oxidation state of the conjugated polymer electrodes was controlled, the seeding density could be varied by a factor of 2. Along the oxidized PEDOT:Tosylate-electrodes, a relatively lower density of, and less tightly bonded, human serum albumin (HSA) was observed as compared to reduced electrodes. We found that this favors adhesion of the specific stem cells studied. Surface analysis experiments, such as photoelectron spectroscopy, and water contact angle measurements, were carried out to investigate the mechanisms responsible for the electronic control of the seeding density of the c17.2 neural stem cells. Further, our findings may provide an opening for electronic control of stem cell differentiation.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-16247 (URN)10.1021/la8028337 (DOI)
Available from: 2009-01-12 Created: 2009-01-09 Last updated: 2017-12-14
Carlegrim, E., Gao, B., Kanciurzewska, A., de Jong, M. P., Wu, Z., Luo, Y. & Fahlman, M. (2008). Near-edge x-ray absorption studies of Na-doped tetracyanoethylene films: A model system for the V(TCNE)x room-temperature molecular magnet. Physical Review B. Condensed Matter and Materials Physics, 77, 054420
Open this publication in new window or tab >>Near-edge x-ray absorption studies of Na-doped tetracyanoethylene films: A model system for the V(TCNE)x room-temperature molecular magnet
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2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 77, p. 054420-Article in journal (Refereed) Published
Abstract [en]

V(TCNE)x, with TCNE=tetracyanoethylene and x~2, is an organic-based molecular magnet with potential to be used in spintronic devices. With the aim of shedding light on the unoccupied frontier electronic structure of V(TCNE)x we have studied pristine TCNE and sodium-intercalated TCNE by near edge x-ray absorption fine structure (NEXAFS) spectroscopy as well as with theoretical calculations. Sodium-intercalated TCNE was used as a model system of the more complex V(TCNE)x and both experimental and theoretical results of the model compound have been used to interpret the NEXAFS spectra of V(TCNE)x. By comparing the experimental and theoretical C K-edge of pristine TCNE, the contributions from the various carbon species (cyano and vinyl) could be disentangled. Upon fully sodium intercalation, TCNE is n doped with one electron per molecule and the features in the C and N K-edge spectra of pristine TCNE undergo strong modification caused by partially filling the TCNE lowest unoccupied molecular orbital (LUMO). When comparing the C and N K-edge NEXAFS spectra of fully sodium-doped TCNE with V(TCNE)x, the spectra are similar except for broadening of the features which originates from structural disorder of the V(TCNE)x films. The combined results from the model system and V(TCNE)x suggest that the lowest unoccupied molecular orbital with density on the nitrogen atoms in V(TCNE)x has no significant hybridization with vanadium and is similar to the so-called singly occupied molecular orbital of the TCNE anion. This suggests that the LUMO of V(TCNE)x is TCNE or vanadiumlike, in contrast to the frontier occupied electronic structure where the highest occupied molecular orbital is a hybridization between V(3d) and cyano carbons. The completely different nature of the unoccupied and occupied frontier electronic structure of the material will most likely affect both charge injection and transport properties of a spintronic device featuring V(TCNE)x.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-11753 (URN)10.1103/PhysRevB.77.054420 (DOI)
Note
Original publication: E. Carlegrim, B. Gao, A. Kanciurzewska, M. P. de Jong, Z. Wu, Y. Luo and M. Fahlman, Near-edge x-ray absorption studies of Na-doped tetracyanoethylene films: A model system for the V(TCNE)x room-temperature molecular magnet, 2008, Physical Review B, (77), 054420. http://dx.doi.org/10.1103/PhysRevB.77.054420. Copyright: The America Physical Society, http://prb.aps.org/Available from: 2008-05-07 Created: 2008-05-07 Last updated: 2017-12-13
Carlegrim, E., Kanciurzewska, A., de Jong, M. P. & Fahlman, M. (2008). The unoccupied electronic structure of the semi-conducting room temperature molecular magnet V(TCNE)2. Chemical Physics Letters, 452(1-3), 173-177
Open this publication in new window or tab >>The unoccupied electronic structure of the semi-conducting room temperature molecular magnet V(TCNE)2
2008 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 452, no 1-3, p. 173-177Article in journal (Refereed) Published
Abstract [en]

The unoccupied electronic structure of the organic-based magnet V(TCNE)x (TCNE = tetracyanoethylene, x~2) has been studied with near edge x-ray absorption fine structure (NEXAFS) and with photoelectron spectroscopy (PES). By studying V(TCNE)x upon sodium-doping, the electron-accepting state, i.e. the lowest unoccupied molecular orbital (LUMO) of V(TCNE)x was shown mainly to be localized on (TCNE)--units in contrast to the hole-accepting state, i.e. the highest occupied molecular orbital (HOMO), which previously was assigned primarily to be V(3d)-derived. This study also showed that there are trap states for electron transport located below the (TCNE)2- level, likely leading to decreased electron mobility.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2008
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-11143 (URN)10.1016/j.cplett.2007.12.049 (DOI)
Note
Original publication: Elin Carlegrim, Anna Kanciurzewska, Michel P. de Jong, Carl Tengstedt and Mats Fahlman, The unoccupied electronic structure of the semi-conducting room temperature molecular magnet V(TCNE)2, 2008, Chemical Physics Letters, (452), 1-3, 173-177. http://dx.doi.org/10.1016/j.cplett.2007.12.049. Copyright: Elsevier Ltd, http://www.elsevier.com/Available from: 2008-02-27 Created: 2008-02-27 Last updated: 2017-12-13
de Jong, M. P., Tengstedt, C., Kanciurzewska, A., Carlegrim, E., Salaneck, W. R. & Fahlman, M. (2007). Chemical bonding in V (TCNE)x (x~2) thin-film magnets grown in situ. Physical Review B. Condensed Matter and Materials Physics, 75(6)
Open this publication in new window or tab >>Chemical bonding in V (TCNE)x (x~2) thin-film magnets grown in situ
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 6Article in journal (Refereed) Published
Abstract [en]

The molecule-based magnet V (TCNE)x, with TCNE=tetracyanoethylene, x˜2, shows an exceptionally high magnetic ordering temperature of about 400 K. With the aim to shed light on the origins of the robust magnetic ordering interactions, we have characterized the chemical bonding in V (TCNE)x thin films, prepared by an in situ chemical vapor deposition method, using photoelectron spectroscopy, x-ray absorption spectroscopy (XAS), and x-ray magnetic circular dichroism (XMCD). The XAS and XMCD results were interpreted by ligand field multiplet and charge transfer multiplet calculations, which show that the V-NC bonds are characterized by a large crystal field parameter 10Dq=2.3 eV and strong ligand to metal charge transfer effects, resulting in a hybrid V (3d) -CN ground state given by 60% 3 d3 and 40% 3 d4 L, where L is a hole on the cyano ligands. © 2007 The American Physical Society.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-49994 (URN)10.1103/PhysRevB.75.064407 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12
Kanciurzewska, A., Dobruchowska, E., Baranzahi, A., Carlegrim, E., Fahlman, A., Fahlman, M. & Girtu, M. A. (2007). Dye sensitized solar cells with a plastic counter electrode of poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonate) - art. no. 665611. Proceedings of SPIE, the International Society for Optical Engineering, 6656, 65611-65611
Open this publication in new window or tab >>Dye sensitized solar cells with a plastic counter electrode of poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonate) - art. no. 665611
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2007 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 6656, p. 65611-65611Article in journal (Refereed) Published
Abstract [en]

n/a

Place, publisher, year, edition, pages
International Society for Optical Engineering; 1999, 2007
Keywords
dye-sensitized solar cells; plastic counter electrode; PEDOT-PSS; I-3(-)/I- electrolyte; photoelectron spectroscopy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-59148 (URN)000253182100019 ()
Available from: 2010-09-10 Created: 2010-09-09 Last updated: 2017-12-12
Kanciurzewska, A., Dobruchowska, E., Baranzahi, A., Carlegrim, E., Fahlman, M. & Girtu, M. A. (2007). Study on Poly(3,4-ethylene dioxythiophene)-Poly(styrenesulfonate) as a plastic counter electrode in dye sensitized solar cells. Journal of Optoelectronics and Advanced Materials, 9(4), 1052-1059
Open this publication in new window or tab >>Study on Poly(3,4-ethylene dioxythiophene)-Poly(styrenesulfonate) as a plastic counter electrode in dye sensitized solar cells
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2007 (English)In: Journal of Optoelectronics and Advanced Materials, ISSN 1454-4164, E-ISSN 1841-7132, Vol. 9, no 4, p. 1052-1059Article in journal (Refereed) Published
Abstract [en]

Dye sensitized solar cells with PEDOT-PSS coated directly on flexible polyester substrate as counter electrode have been fabricated. The behavior of such plastic counter electrode in the presence of I/I-3 redox electrolyte has been investigated with X-ray photoelectron spectroscopy. We have found that some of iodine species are "trapped" within the PEDOT-PSS layer. The presence of I-3, I-2 and PEDOT charge transfer complexes with iodine species may block the surface of the electrode. Furthermore, the PEDOT may be further oxidized (p-doped) during cell operation, which in turn may cause overoxidation and loss of conductivity in the PEDOT-PSS film. Additionally, the interactions between PEDOT and iodine species may be enlarged because of the partial loss of PSS protective counter ion. That has resulted in decrease of PEDOT-PSS catalytic activity for reduction of I-3 to I in the redox electrolyte and has caused worse cell performance than in case of DSSC with Pt counter electrode.

Keywords
dye-sensitized solar cells, plastic counter electrode, PEDOT-PSS, photoelectron spectroscopy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-48021 (URN)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Tehrani, P., Kanciurzewska, A., Crispin, X., Robinson, N. D., Fahlman, M. & Berggren, M. (2007). The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films. Solid State Ionics, 177(39-40), 3521-3527
Open this publication in new window or tab >>The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films
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2007 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 177, no 39-40, p. 3521-3527Article in journal (Refereed) Published
Abstract [en]

Chemical degradation of conjugated polymers is one cause of material failures in polymer-based (opto)electronic devices, but can also be used as a technique for subtractive patterning of polymer films. When a large anodic potential is applied to the conducting polymer blend poly(3,4-ethylenedioxythiophene)-poly(4styrenesulfonate), PEDOT:PSS, an over-oxidation reaction occurs, altering its electrical conductivity. Here, we have studied the effect of pH on the electrochemical over-oxidation process of PEDOT in PEDOT:PSS. High pH is associated with a decrease of over-oxidation potential and an increase of resistivity in the resulting film. Vibrational spectroscopy and photoelectron spectroscopy measurements on over-oxidized PEDOT:PSS films indicate that the decrease in conductivity results from cleavage of the conjugation pathway accompanied by the formation of sulfone, carbonyl and carboxylic groups in the polymer chain.

Place, publisher, year, edition, pages
ScienceDirect, 2007
Keywords
Poly(3, 4-ethylenedioxythiophene), Degradation, Over-oxidation, XPS, FTIR, Conjugated polymer, Polythiophenes
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:liu:diva-14026 (URN)10.1016/j.ssi.2006.10.008 (DOI)
Available from: 2008-11-12 Created: 2008-10-17 Last updated: 2017-12-13Bibliographically approved
Jakobsson, F. L. E., Crispin, X., Lindell, L., Kanciurzewska, A., Fahlman, M., Salaneck, W. R. & Berggren, M. (2006). Towards all-plastic flexible light emitting diodes. Chemical Physics Letters, 433(1-3), 110-114
Open this publication in new window or tab >>Towards all-plastic flexible light emitting diodes
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2006 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 433, no 1-3, p. 110-114Article in journal (Refereed) Published
Abstract [en]

All-plastic light emitting diodes require the design and fabrication of low work function plastic electrodes. Here, we show that the work function of poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT-PSS) can be decreased from 4.8 eV to 3.9 eV by surface reaction with the strong electron-donor tetrakis(dimethylamino)ethylene (TDAE). The surface modification was characterized by photoelectron spectroscopy and optical spectroscopy. The low work function plastic electrode was used in a first prototype for all-plastic light emitting diodes.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-14831 (URN)10.1016/j.cplett.2006.11.007 (DOI)
Available from: 2008-11-12 Created: 2008-09-25 Last updated: 2017-12-13
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