Nanomaterials synthesis and modifications

Assembly and microfabrication

Competences

Optical lithography and thin film fabrication (sputtering, plasmaenhanced chemical vapor deposition of SiO2/SiNX, RIE and wet etch) Ink formulation and inkjet deposition Laser-assisted microstructuring of materials Surface mounting (alignment, soldering, adhesive bonding) FDA and SLA 3D printing

Materials synthesis Thermal and plasma enhanced chemical vapor deposition Chemical vapor transport reactions

3 and 4 axes CNC fabrication 3D scaffolds for cell growth

Characterization and device testing

Wet chemical synthesis and solvothermal methods

TEM/ED, SEM/EDX, XRD, Raman, UV-Vis, AFM/STM

Anodization of metal and semiconductor surfaces

DC analysis between 100-600 K in controlled gas environment

Chemical surface functionalization, decoration and crystal doping

Electrochemical measurements, impedance spectroscopy and high-frequency analysis up to 3 GHz

Physical vapor deposition processes

Mechanical stess-strain and indentation measurements Wireless, autonomus measurements and system integration Thermal diffusivity (flash) and stability (TGA/DSC) measurements Finite-element modeling (mechanical, thermal, thermomechanical, electrical)

University of Oulu

Nanomaterials synthesis and modifications Main contributors Krisztian Kordas (PI) Geza Toth Melinda Mohl Georgies Alene Rashad Hajimammadov Zita Csendes Gabriela Lorite Aron Dombovari Niina Halonen (alumni) Anne-Riikka Rautio (alumni) Jarmo Kukkola (alumni) Jhih-Fong Lin (alumni)

Collaborators Zoltán Kónya (University of Szeged) Ákos Kukovecz (University of Szeged) Jyri-Pekka Mikkola (Umeå University) Päivi Mäki-Arvela (Åbo Akademi) Dmitry Murzin (Åbo Akademi) Ming-Chung Wu (Chang Gung University) Wei-Fang Su (National Taiwan University) Robert Vajtai (Rice University) Pulickel M. Ajayan (Rice University)

University of Oulu

Selective CNT growth

Processes from 400°C on optimized catalyst layers Highly selective growth with a lateral resolution limited only by optical lithography Large variety aligned CNT forests with thickness from a few micrometers up to several millimeters Growth on 2D and in 3D microstructured templates

Pitkanen, O; Halonen, N; Leino, AR; Maklin, J; Dombovari, A; Lin, JH; Toth, G; Kordas, K; Low-Temperature Growth of Carbon Nanotubes on Bi- and Trimetallic Catalyst Templates, Top. Catal. 56 (2013) 522. Halonen, N; Rautio, A; Leino, AR; Kyllönen, T; Tóth, G; Lappalainen, J; Kordás, K; Huuhtanen, M; Keiski, RL; Sápi, A; Szabó, M; Kukovecz, A; Kónya, Z; Kiricsi, I; Vajtai, R; Ajayan, PM; Three dimensional carbon nanotube scaffolds as filters or catalyst support membranes, ACS Nano 4 (2010) 2003. Halonen, N; Kordás, K; Tóth, G; Mustonen, T; Mäklin, J; Vähäkangas, J; Ajayan, PM; Vajtai, R; Controlled CCVD synthesis of robust multi-walled carbon nanotube films, J. Phys. Chem. C 112 (2008) 6723. University of Oulu

Cu nanowires and derivatives

Hydrothermal synthesis with easy to scale up Prone to oxidation To be used as template material

M. Mohl, P. Pusztai, A. Kukovecz, Z. Konya, J. Kukkola, K. Kordas, R. Vajtai, P.M. Ajayan, Low Temperature Large–Scale Synthesis and Electrical Testing of Ultralong Copper Nanowires, Langmuir 26 (2010) 16496. M. Mohl, D. Dobo, A. Kukovecz, Z. Konya, K. Kordas, J.Q. Wei, R. Vajtai, P.M. Ajayan, Formation of CuPd and CuPt Bimetallic Nanotubes by Galvanic Replacement Reaction, J. Phys. Chem. C 115 (2011) 9403.

University of Oulu

Titanates and titania nanowires and their derivatives

Thermal and plasma-enhanced CVD processes from 400°C on optimized catalyst layers Highly selective growth with a lateral resolution limited only by optical lithography Large variety aligned CNT forests with thickness from a few micrometers up to several millimeters Growth on 2D and in 3D microstructured templates Kordas, K; Mohl, M; Kónya, Z; Kukovecz, A; Layered titanate nanostructures: perspectives for industrial exploitation, Transl. Mater. Res. 2 (2015) 015003. Kukovecz, A; Kordas, K; Kiss, J; Kónya, Z; Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires, Surf. Sci. Rep. 71 (2016) 473-546. Wu, MC; Liao, HC; Cho, YC; Hsu,; Lin, TH; Su, WF; Sapi, A; Kukovecz, A; Konya, Z; Shchukarev, A; Sarkar, A; Larsson, W; Mikkola, JP; Mohl, M; Toth, G; Jantunen, H; Valtanen, A; Huuhtanen, M; Keiski, R; Kordas, K. Photocatalytic activity of nitrogen-doped TiO2-based nanowires: a photo-assisted Kelvin probe force microscopy study, J. Nanopart. Res. 16 (2013) UNSP 2143. Wu, MC; Toth, G; Sapi, A; Leino, AR; Konya, Z; Kukovecz, A; Su, WF; Kordas, K, Synthesis and Photocatalytic Performance of Titanium Dioxide Nanofibers and the Fabrication of Flexible Composite Films from Nanofibers, J. Nanosci. Nanotech. 12 (2012) 1421 University of Oulu

WO3 nanowires

Hydrothermally grown WO3 Feasibility of scaling up Semiconducting, n-type behavior Sensor applications

Szabo, M; Pusztai, P; Leino, AR; Kordas, K; Konya, Z; Kukovecz, A, Synthesis and characterization of WO3 nanowires and metal nanoparticle-WO3 nanowire composites, J. Mol. Struct. 1044 (2013) 99. Kukkola, J; Mohl, M; Leino, A-R; Mäklin J; Halonen, N; Shchukarev, A; Konya, Z; Jantunen, H; Kordas, K; Room temperature hydrogen sensors based on metal decorated WO3 nanowires, Sens. Actuat. B 186 (2013) 90.

University of Oulu

WS2 nanowires

Hydrothermally grown WO3 followed by sulfurization to obtain WS2 Feasibility of scaling up Transition from n-type to p-type semiconductor Good photoconduction

G. Alene, A. Dombovari, T. Sipola, R. Puskás, A. Kukovecz, Z. Kónya, A. Popov, J.-F. Lin, G.S. Lorite, M. Mohl, G. Toth, A. Lloyd-Spetz, K. Kordas, A novel WS2 nanowire-nanoflake hybrid material synthesized from WO3 nanowires in sulfur vapor, Sci. Rep. 6 (2016) 25610.

University of Oulu

Completed Optimal production of bioethanol from macroalgae via photo-chemoenzymatic processing (2013-2015) - Academy of Finland (PI: K. Kordas)

Projects Ongoing Surface plasmons at work: Visible and infrared light enhanced catalysis and gas sensing - Academy of Finland (PI: K. Kordas)

Smart and sustainable food packaging utilizing flexible printed intelligence and materials technologies (2012-2014) - European Union FP7 (PI: G. Toth) Implementation of highly efficient TiO2 based photocatalytic nanomaterials (2011-2014) - Finnish Funding Agency for Technology and Innovation (PI: K. Kordas) Autonomous R2R systems (2011-2014) - Finnish Funding Agency for Technology and Innovation (PI: K. Kordas)

Hybrid nanocarbon materials for biosensors - Academy of Finland (PI: K. Kordas)

Nanoscale thermal management of multi-scale electrical components using carbon nanotubes grown by CCVD and PECVD (2009-2011) Academy of Finland (PI: G. Toth)

More-than-Moore research community - University of Oulu (PI: K. Kordas)

Thermal management with carbon nanotube architectures (2010-2012) European Union FP7 (PI: K. Kordas)

3D hierarchical scaffold based on bio-decorated carbon nanotubes for bone and cartilage tissue engineering – Academy of Finland (PI: Gabriela S. Lorite)

Nanotechnology Platform for Electronics and Photonics (2010-2013) European Union FP7 (PI: K. Kordas)

High-power Impulse Plasma Process Operations for the Creation of Advanced Metallic Parts - European Union FP7 (PI: G. Toth)

Novel catalyst materials based on robust CNT membranes (2009-2012) Academy of Finland (PI: K. Kordas) Invisible electric tagging with nanomaterials (2008-2010) - Finnish Funding Agency for Technology and Innovation (PI: K. Kordas) Hydrogen for fuel cells by bioethanol reforming 2, - Finnish Funding Agency for Technology and Innovation 2007-2009 (PI G. Toth) Nanomaterials in wireless tags based on printed electronics (2005-2008) Finnish Funding Agency for Technology and Innovation (PI: H. Jantunen) Integrated self-adjusting nano-electronic sensors (2006-2009) - European Union FP6 (PI: K. Kordas) University of Oulu

Doctoral dissertations

Anne-Riikka Rautio (2016): On the stability of carbon nanotube and titania nanowire based catalyst materials Jhih-Fong Lin (2015): Multi-dimensional carbonaceous composites for electrode applications Jani Mäklin (2014): Electrical and thermal applications of carbon nanotube films Niina Halonen (2013): Synthesis and applications of macroscopic well-aligned multi-walled carbon nanotube films Jarmo Kukkola (2013): Gas sensors based on nanostructured tungsten oxides Tero Mustonen (2009): Inkjet printing of carbon nanotubes for electronic applications

University of Oulu