prof.dr.ir. G. Koster (Gertjan)

Engineering & Materials Science

# Epitaxial Growth
# Ferroelectric Materials
# Heterojunctions
# Nanosheets
# Oxides
# Pulsed Laser Deposition
# Substrates
# Thin Films

Three main directions: in situ spectroscopy, oxide thin film on different templates, oxide thin film growth.

Ni, S. , Houwman, E. , Koster, G. , & Rijnders, G. (2023). On the importance of the SrTiO₃ template and the electronic contact layer for the integration of phase-pure low hysteretic Pb(Mg_0.33Nb_0.67)O₃-PbTiO₃ layers with Si. Applied physics A: Materials science and processing, 129(4), [275]. https://doi.org/10.1007/s00339-023-06447-x

Kante, M. V., Weber, M. L. , Ni, S., van den Bosch, I. C. G., van der Minne, E., Heymann, L., Falling, L. J., Gauquelin, N. , Tsvetanova, M. , Cunha, D. M. , Koster, G., Gunkel, F., Nemšák, S., Hahn, H., Velasco Estrada, L. , & Baeumer, C. (2023). A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidation. ACS nano, 17(6), 5329-5339. https://doi.org/10.1021/acsnano.2c08096

Trstenjak, U., Daneu, N., Belhadi, J., Samardžija, Z., Matavž, A., Bobnar, V. , Koster, G., & Spreitzer, M. (2023). Non-stoichiometry and its implications for the properties of PMN-PT thin films. Journal of materials chemistry C, 11(3), 1144-1154. https://doi.org/10.1039/d2tc04070k

Jovanović, Z., Trstenjak, U., Ho, H. C., Butsyk, O. , Chen, B., Tchernychova, E., Borodavka, F. , Koster, G., Hlinka, J., & Spreitzer, M. (2023). Tiling the Silicon for Added Functionality: PLD Growth of Highly Crystalline STO and PZT on Graphene Oxide-Buffered Silicon Surface. ACS Applied Materials and Interfaces, 15(4), 6058-6068. https://doi.org/10.1021/acsami.2c17351

van de Putte, M. W. (2023). Vertically aligned nanocomposites as next-generation thermoelectric architectures. [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente. https://doi.org/10.3990/1.9789036555432

Le, P. T. P. , Ni, S., Repecaud, P. A., van der Minne, E. , van den Nieuwenhuijzen, K. J. H. , Nguyen, M. D. , ten Elshof, J. E. , Morales-Masis, M. , & Koster, G. (2023). Correlated Metals Transparent Conductors with High UV to Visible Transparency on Amorphous Substrates. Advanced materials interfaces, 10(1), [2201335]. https://doi.org/10.1002/admi.202201335

Uemura, Y., Ismail, A. S. M., Park, S. H., Kwon, S., Kim, M., Elnaggar, H., Frati, F., Wadati, H., Hirata, Y., Zhang, Y., Yamagami, K., Yamamoto, S., Matsuda, I. , Halisdemir, U. , Koster, G., Milne, C., Ammann, M., Weckhuysen, B. M., & De Groot, F. M. F. (2022). Hole Dynamics in Photoexcited Hematite Studied with Femtosecond Oxygen K-edge X-ray Absorption Spectroscopy. Journal of physical chemistry letters, 13(19), 4207-4214. https://doi.org/10.1021/acs.jpclett.2c00295

Houwman, E. P., Okkerman, L. , Do, M. T. , Koster, G. , & Rijnders, G. (2022). Interface-induced effects on the polarization response of epitaxial ferroelectric thin films—an experimental study and theoretical analysis. In Epitaxial Growth of Complex Metal Oxides: Second Edition (pp. 137-155). Elsevier. https://doi.org/10.1016/B978-0-08-102945-9.00001-0

Belhadi, J., Hanani, Z., Trstenjak, U., Shepelin, N. A., Bobnar, V. , Koster, G., Hlinka, J., Pergolesi, D., Lippert, T., El Marssi, M. , & Spreitzer, M. (2022). Large imprint in epitaxial 0.67Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃thin films for piezoelectric energy harvesting applications. Applied physics letters, 121(18), [182903]. https://doi.org/10.1063/5.0115777

Koster, G. , Birkhölzer, Y. , Huijben, M. , Rijnders, G., Spreitzer, M., Kornblum, L. , & Smink, S. (2022). Growth studies of heteroepitaxial oxide thin films using reflection high-energy electron diffraction. In Epitaxial Growth of Complex Metal Oxides: Second Edition (pp. 3-36). Elsevier. https://doi.org/10.1016/B978-0-08-102945-9.00003-4

Koster, G. , & Rijnders, A. J. H. M. (2022). Integration of thin film functional oxides on technical substrates. Poster session presented at MESA+ Meeting 2022, Enschede, Netherlands.

van den Bosch, I. C. G., Kiens, E. , Mul, G. , Koster, G. , Mei, B. T. , & Baeumer, C. (2022). Tuning the activity of multilayer oxygen evolution electrocatalysts. Poster session presented at NWO CHAINS 2022, Veldhoven, Netherlands.

van der Minne, E., van den Bosch, I. C. G. , Le, T. P. P., Kiens, E. , Ni, S., Heymann, L. , Koster, G. , & Baeumer, C. (2022). Electrochemical Thin Films and Interfaces. Poster session presented at MESA+ Meeting 2022, Enschede, Netherlands.

Ni, S., Kante, M. V. , M. Cunha, D., Weber, M. L., van den Bosch, I. C. G., Heymann, L., van der Minne, E., Falling, L. , Koster, G., Gunkel, F., Nemsak, S., Hahn, H., Velasco, M. , & Baeumer, C. (2022). High-activity electrocatalyst La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 for water oxidation. Poster session presented at NWO CHAINS 2022, Veldhoven, Netherlands.

Birkhölzer, Y. A. , Sotthewes, K., Gauquelin, N., Riekehr, L., Jannis, D., Van Der Minne, E., Bu, Y., Verbeeck, J. , Zandvliet, H. J. W. , Koster, G. , & Rijnders, G. (2022). High-Strain-Induced Local Modification of the Electronic Properties of VO₂Thin Films. ACS Applied Electronic Materials, 4(12), 6020-6028. https://doi.org/10.1021/acsaelm.2c01176

Ni, S. (2022). Relaxor ferroelectric PMN-PT thin films for low hysteretic microelectronic devices. [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente. https://doi.org/10.3990/1.9789036554640

Nguyen, M. D. , Birkhölzer, Y. A. , Houwman, E. P. , Koster, G. , & Rijnders, G. (2022). Enhancing the Energy-Storage Density and Breakdown Strength in PbZrO₃/Pb_0.9La_0.1Zr_0.52Ti_0.48O₃-Derived Antiferroelectric/Relaxor-Ferroelectric Multilayers. Advanced energy materials, 12(29), [2200517]. https://doi.org/10.1002/aenm.202200517

Birkhölzer, Y. A. (2022). Nanoscale strain control of oxide thin films. [PhD Thesis - Research UT, graduation UT, University of Twente]. University of Twente. https://doi.org/10.3990/1.9789036553483

Bouwmeester, R. L. , Jansen, T., Altena, M. , Koster, G. , & Brinkman, A. (2022). Observing structural distortions in complex oxides by x-ray photoelectron diffraction. Journal of electron spectroscopy and related phenomena, 257, [147201]. https://doi.org/10.1016/j.elspec.2022.147201

Chen, B., Gauquelin, N., Strkalj, N. , Huang, S. , Halisdemir, U. , Nguyen, M. D., Jannis, D., Sarott, M. F., Eltes, F., Abel, S., Spreitzer, M., Fiebig, M., Trassin, M., Fompeyrine, J., Verbeeck, J. , Huijben, M. , Rijnders, G. , & Koster, G. (2022). Signatures of enhanced out-of-plane polarization in asymmetric BaTiO₃ superlattices integrated on silicon. Nature communications, 13(1), [265]. https://doi.org/10.1038/s41467-021-27898-x

Uemura, Y., Ismail, A. S. M., Park, S. H., Kwon, S., Kim, M., Niwa, Y., Wadati, H., Elnaggar, H., Frati, F., Haarman, T., Höppel, N., Huse, N., Hirata, Y., Zhang, Y., Yamagami, K., Yamamoto, S., Matsuda, I., Katayama, T., Togashi, T., ... De Groot, F. M. F. (2021). Femtosecond Charge Density Modulations in Photoexcited CuWO₄. The Journal of physical chemistry part C, 125(13), 7329-7336. https://doi.org/10.1021/acs.jpcc.0c10525

Chen, B., Gauquelin, N., Green, R. J., Verbeeck, J. , Rijnders, G. , & Koster, G. (2021). Asymmetric Interfacial Intermixing Associated Magnetic Coupling in LaMnO₃/LaFeO₃ Heterostructures. Frontiers in Physics, 9, [698154]. https://doi.org/10.3389/fphy.2021.698154

Birkhölzer, Y. A. , Sotthewes, K. , Koster, G. , & Rijnders, A. J. H. M. (2021). Nanoscale Manipulation of VO2 thin films. Poster session presented at 27th International Workshop on Oxide Electronics, iWOE27, Genoa, Italy.

Huang, S., Blom, F. , Gojzewski, H. , Koster, G. , & Rijnders, A. J. H. M. (2021). Reversible polarization switching in leaky ferroelectrics using an ionic gel induced electrostatic field effect. Applied physics letters, 119(26), [262904]. https://doi.org/10.1063/5.0070067

Geran Malek Kheyli, S. (2021). Investigation into mechanical fatigue of piezoelectric actuators. [EngD Thesis, University of Twente]. University of Twente.

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Committees:

Educational Quality Committee Advanced Technology (2010-1012)
Exam Board Advanced Technology (2012-2016)
Educational committee AT (2016-)

Bachelor

Master

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

2016

https://www.utwente.nl/nieuws/!/2016/3/477452/nanotechnologen-ut-maken-richting-van-magnetisme-instelbaar-in-nieuwe-materialen
https://www.scientias.nl/nieuw-materiaal-laat-computer-denken-als-mens/
https://www.utwente.nl/nieuws/!/2016/7/180869/brein-inspireert-ut-onderzoekers-tot-nieuw-geheugenmateriaal

2014

http://www.utnieuws.nl/english/60662/Nobel_Prizes_explained
http://phys.org/news/2014-10-nanostructures-simple.html
http://www.nwo.nl/actueel/nieuws/2014/cw/nanostructuren-stempelen.html
http://www.utwente.nl/nieuwsevents/2014/9/216804/nanostructuren-stempelen
http://www.utwente.nl/en/newsevents/!/2014/9/216804/creating-nanostructures-using-simple-stamps

2013

http://www.utwente.nl/mesaplus/nl/archief/2013/07/28-juli-publieksdag-bridges-2013.docx/
http://www.utwente.nl/archief/2013/07/wetenschap-ook-populair-op-zwarte-cross.docx
http://www.utwente.nl/mesaplus/nl/archief/2013/06/nanotechnologen-vinden-manier-om-defecten-in-materialen-terug-te-dringen.docx/

2012

Een portret van de werkgroep QAQS (schoonheid), Gertjan Koster (http://www.quaartquascience.nl/agenda/)
http://www.kennislink.nl/publicaties/atomair-lego-levert-bijzonder-magnetisme
Room-temperature magnetism in insulating thin films, http://www.utwente.nl/tnw/ims/news/23okt12_LSMO110%5B2%5D.docx/

2011

Unexpected heterostructure seen in STO (http://nanotechweb.org/cws/article/tech/47039)
Nobel lezing TNW 2011; http://www.utwente.nl/evenementen/nobel-lezingen-2011
http://www.telegraaf.nl/buitenland/10674247/__Inzicht_in_materie_veranderd__.html

2010

Koolstof in de ruimte en tijd; een wetenschappelijke zoektocht, Gertjan Koster, Josée Kleibeuker in Het fenomeen van Schaal, Qua art Qua Science November 2010 (http://www.quaartquascience.nl/fileadmin/user_upload/documents/Uitgaven/Nov_2010_NANO.pdf)

2009

Every single layer matters, Alex Klironomos, Physics Synopsys (http://physics.aps.org/synopsis-for/10.1103/PhysRevB.79.140407); Editors Choice Phys. Rev. B (http://prb.aps.org/edannounce/PhysRevB.77.130001)
How to make CuO sit up straight, Jessica Thomas, Physics Synopsys (http://physics.aps.org/synopsis-for/10.1103/PhysRevB.79.195122); Editors Choice Phys. Rev. B (http://prb.aps.org/edannounce/PhysRevB.77.130001)
2 artikelen vakgroep IMS binnen korte tijd geselecteerd als 'Editors' Suggestion', (http://www.tnw.utwente.nl/nieuws/nieuws/archief/2009/2009_06_04/2_artikelen_vakgroep_ims_geselecteerd.doc/)
Innovatief chemisch onderzoek UT beloond, (http://www.tnw.utwente.nl/nieuws/nieuws/archief/2009/2009_06_18/innovatief_chemisch_onderzoek.doc/)

2008

Kunstkristalbouwer nummer drie by Henk Klomp, Technisch Weekblad no. 9 (in dutch); COMAT system

2007

Monitoring-and Possibly Improving-Superconducting Films by Hang Hogan, Spectroscopy Focus, September, pg 107; on APL 90 (2007) 261917
Watch out for the lack of oxygen by James N. Eckstein, Nature Materials (News and Views), 6 473; PRL 98 (2007) 196802
Evidence suggests that a ferromagnetic metal may lie at the interface between nonmagnetic insulatorsby B.G. Levi, Physics Today, June; PRL 98 (2007) 196802