Sensortehnoloogiate labor

Uurimisprojektid ja võrgustikud

• Grafeenil põhinevate gaasisensorite karakteriseerimine (2022−2023), "Muu välisriiklik erasektor" projektid VLTFY22174 ja VLTFY23252, vastutav täitja Raivo Jaaniso
• Liinil liikuva puitmaterjali kaalusensorite (kaalumisloogika) valik ja integreerimine tarkvarasse (2022), "Eesti eraettevõtted" projekt LLTFY22126, vastutav täitja Raivo Jaaniso
• Uued struktuurid ja signaalitöötluse meetodid 2D materjalidel põhinevate gaasisensorite mikromassividele (2022−2026), personaalse uurimistoetuse rühmagrant PRG1580, vastutav täitja Raivo Jaaniso
• Nano-optiliste struktuuride integreerimine gaasisensoritega numbrilise pöörddisaini meetodeid kasutades (2022−2025), personaalse uurimistoetuse stardigrant PSG716, vastutav täitja Taavi Repän
• Graphene Flagship Core Project 3 (2020−2023), Horisont 2020 projekt MLTFY20220R, vastutav täitja Raivo Jaaniso
• Elektroonsete märgiste (RFID) ja GPS/GNSS rakendamine välilao automatiseerimisel (2020−2022), "Nutika spetsialiseerumise rakendusuuringud" projekt LLTFY20500, vastutav täitja Raivo Jaaniso
• Foononite ja eksitonreservuaari roll eksitoonsetel tugevsidestatud süsteemidel baseeruvate madala lävendiga laserisarnaste valgusallikate energiaülekande protsessides (2020−2023), personaalne uurimistoetus PSG406, vastutav täitja Siim Pikker

Valik uuemaid teadustöid

• Margus Kodu, Rainer Pärna, Tea Avarmaa, Indrek Renge, Jekaterina Kozlova, Tauno Kahro, Raivo Jaaniso, Gas-Sensing Properties of Graphene Functionalized with Ternary Cu-Mn Oxides for E-Nose Applications, Chemosensors 11 (2023), 460.
• Valter Kiisk, Michal Novotny, Margus Kodu, Siim Pikker, Tea Avarmaa, Jan Remsa, Jan Lancok, Martin Vrnata, Raivo Jaaniso, Pulsed Laser Annealed Rare Earth Doped TiO₂ Thin Films for Luminescence and Sensing Applications, Applied Surface Science 637 (2023), 157884.
• Valter Kiisk, Margus Kodu, Siim Pikker, Tea Avarmaa, Raivo Jaaniso, Oxygen-Sensitive Luminescence of Ultrathin CdWO₄:Sm³⁺ Films, Optical Materials 128 (2022), 11238.
• Martin Lind, Valter Kiisk, Margus Kodu, Tauno Kahro, Indrek Renge, Tea Avarmaa, Prashanth Makaram, Amaia Zurutuza, Raivo Jaaniso, Semiquantitative Classification of Two Oxidizing Gases with Graphene-Based Gas Sensors, Chemosensors 10 (2022), 68.
• Marius Rodner, Adam Icardi, Margus Kodu, Raivo Jaaniso, Andreas Schütze, Jens Eriksson, Metal Oxide Nanolayer-Decorated Epitaxial Graphene: A Gas Sensor Study, Nanomaterials 10 (2020), 2168.
• Valter Kiisk, Raivo Jaaniso, Rare earth–doped oxide materials for photoluminescence-based gas sensors, in: Raivo Jaaniso and Ooi Kiang Tan (Eds.), Semiconductor Gas Sensors, 2nd Edition (2019), pp. 271–305.
• Margus Kodu, Artjom Berholts, Tauno Kahro, Jens Eriksson, Rositsa Yakimova, Tea Avarmaa, Indrek Renge, Harry Alles, Raivo Jaaniso, Graphene-Based Ammonia Sensors Functionalised with Sub-Monolayer V₂O₅: A Comparative Study of Chemical Vapour Deposited and Epitaxial Graphene, Sensors 19 (2019) 951
• Valter Kiisk, Kristiina Akulitš, Margus Kodu, Tea Avarmaa, Hugo Mändar, Jelena Kozlova, Marko Eltermann, Laurits Puust, Raivo Jaaniso, Oxygen-Sensitive Photoluminescence of Rare Earth Ions in TiO₂ Thin Films, J. Phys. Chem. C 123 (2019) 17908.
• Dmitri Lanevski, Koit Mauring, Eric Tkaczyk, Raivo Jaaniso, Optical Differential Temperature Measurement with Beat Frequency Phase Fluorometry, Applied Optics 57 (2018) 8053
• Margus Kodu, Artjom Berholts, Tauno Kahro, Mati Kook, Peeter Ritslaid, Helina Seemen, Tea Avarmaa, Harry Alles, Raivo Jaaniso, Graphene Functionalised by Laser-ablated V₂O₅ for a Highly Sensitive NH₃ Sensor, Beilstein J. Nanotechnol. 8 (2017) 571
• Jüri Krustok, Reelika Kaupmees, Raivo Jaaniso, Valter Kiisk, Ilmo Sildos, B. Li, Y. Gong, Local Strain-induced Band Gap Fluctuations and Exciton Localization in Aged WS₂ Monolayers, AIP Advances 7 (2017) 065005
• Margus Kodu, Artjom Berholts, Tauno Kahro, Tea Avarmaa, Aarne Kasikov, Ahti Niilisk, Harry Alles, Raivo Jaaniso, Highly Sensitive NO₂ Sensors by Pulsed Laser Deposition on Graphene, Appl. Phys. Lett. 109 (2016) 113108
• Kairi Kivirand, Aare Floren, Margarita Kagan, Tea Avarmaa, Toonika Rinken, Raivo Jaaniso, Analyzing the Biosensor Signal in Flows: Studies with Glucose Optrodes, Talanta 131 (2015) 74

Hiljutised kutsutud ja suulised ettekanded

• Margus Kodu, Selective detection of toxic gases by arrays of single layer graphene sensors functionalized with nanolayers of different oxides, Eurosensors XXXV, Lecce, Italy, September 10-13, 2023.
• Raivo Jaaniso, Graphene in gas sensors (invited), Innovation Workshop for Electronics and 2D-EPL, IMEC, Leuven, Belgium, March 8-9. 2023.
• Raivo Jaaniso, Graphene-based materials for E2-nose (invited), Graphene Flagship Divison II symposium, Rome, Italy, April 26-28, 2023.
• Raivo Jaaniso, Designing oxide-on-graphene structures for smart gas sensors, Graphene Week, Munich, Germany, September 5-9, 2022.
• Raivo Jaaniso, Graphene-based sensors for environmental monitoring (invited), FM&NT – NIBS 2022, Riga, Latvia, July 4-6, 2022.

Aparatuur

Setup for electrical and optical gas sensor characterization. The computer-controlled measurement complex includes gas mixing stations (based on Brooks mass flow controllers), Keithley sourcemeters for electrical measurements and an optical spectrometer for optical measurements. Available special gases include O₃, NO₂, CO, CO₂, NH₃, H₂S, SO₂, acetone and ethanol (ppb-to-ppm range), which can be tested in the background of Ar, N₂, O₂, or their arbitrary mixtures with the relative humidity between 0 and 90%. The majority of test gases are 5N purity and fed from cylinders or permeation tubes; ozone is generated before mixing.

Image

Setup for pulsed laser deposition of thin films includes two UHV deposition chambers, UV excimer laser (Coherent COMPexPro 205,
wavelength 248 nm), and equipment for in-situ process monitoring (Woollam M2000x spectroscopic ellipsometer, Andor Echelle spectrograph for plasma spectroscopy).