Explanipedia

High‐Performance Graphene‐Based Gas Sensors with Pulsed Heating and AI Processing Open

Paniz Vafaei, Martin Lind, V. Kiisk, Tauno Kahro, Ahmet Burak Baloglu , et al. · 2025

Gas sensors play a critical role in safety assurance, environmental monitoring, and health diagnostics, requiring high sensitivity, fast response, and low power consumption—especially in portable applications. This study presents graphene‐…

Graphene/TiO2 Heterostructure Integrated with a Micro-Lightplate for Low-Power NO2 Gas Detection Open

Paniz Vafaei, Margus Kodu, Harry Alles, V. Kiisk, Olga Casals , et al. · 2025

Low-power gas sensors that can be used in IoT (Internet of Things) systems, consumer devices, and point-of-care devices will enable new applications in environmental monitoring and health protection. We fabricated a monolithic chemiresisti…

Selective Detection of Toxic Gases by Arrays of Single-Layer Graphene Sensors Functionalized with Nanolayers of Different Oxides Open

Margus Kodu, Martin Lind, V. Kiisk, Indrek Renge, Raivo Jaaniso · 2024

Graphene provides an ideal platform for chemiresistive gas sensors as the material is fully exposed to the surrounding environment. For practical use in an ambient atmosphere, its sensitivity and selectivity should be evoked by functionali…

Reusable magnetic mixture of CuFe2O4–Fe2O3 and TiO2 for photocatalytic degradation of pesticides in water Open

Dmytro Danilian, Franziska Maria Bundrück, Arvo Kikas, Tanel Käämbre, Hugo Mändar , et al. · 2024

Mixture of TiO 2 -P25 and magnetic CuFe 2 O 4 –Fe 2 O 3 nanocomposites improves photocatalytic water treatment and enables easy catalyst recovery, effectively degrading pollutants like 2,4-D.

Comparison of Toxicity and Cellular Uptake of CdSe/ZnS and Carbon Quantum Dots for Molecular Tracking Using Saccharomyces cerevisiae as a Fungal Model Open

Sanni M. A. Färkkilä, Monika Mortimer, Raivo Jaaniso, Anne Kahru, V. Kiisk , et al. · 2023

Plant resource sharing mediated by mycorrhizal fungi has been a subject of recent debate, largely owing to the limitations of previously used isotopic tracking methods. Although CdSe/ZnS quantum dots (QDs) have been successfully used for i…

Semiquantitative Classification of Two Oxidizing Gases with Graphene-Based Gas Sensors Open

Martin Lind, V. Kiisk, Margus Kodu, Tauno Kahro, Indrek Renge , et al. · 2022

Miniature and low-power gas sensing elements are urgently needed for a portable electronic nose, especially for outdoor pollution monitoring. Hereby we prepared chemiresistive sensors based on wide-area graphene (grown by chemical vapor de…

Measurement of stress build‐up of ion exchange strengthened lithium aluminosilicate glass Open

Siim Hödemann, Andreas Valdmann, Mart Paemurru, Johan Anton, V. Kiisk , et al. · 2019

A recently developed nondestructive method was used to investigate the stress build‐up in chemically strengthened lithium aluminosilicate glass. We utilized an updated version of the gradient scattered light method, which now enables more …

Room temperature optical thermometry based on the luminescence of the SiV defects in diamond-=SUP=-*-=/SUP=- Open

Caius Miller, Laurits Puust, V. Kiisk, Е. А. Екимов, И. И. Власов , et al. · 2018

Diamond microcrystals containing silicon-vacancy (SiV) defects were synthesized by using a high-pressure high-temperature treatment of a mixture of pertinent organic-inorganic precursors. Photoluminescence of the SiV defects and its temper…

Steps toward the experimental realization of surface plasmon polariton enhanced spontaneous parametric down-conversion Open

Ardi Loot, I. Sildos, V. Kiisk, Tavo Romann, V. Hizhnyakov · 2018

Phase stability and oxygen-sensitive photoluminescence of ZrO2:Eu,Nb nanopowders Open

V. Kiisk, Laurits Puust, Hugo Mändar, Peeter Ritslaid, Mihkel Rähn , et al. · 2018

Room temperature optical thermometry based on the luminescence of the SiV defects in diamond Open

Caius Miller, Laurits Puust, V. Kiisk, Е. А. Екимов, И. И. Власов , et al. · 2018

SiV-containing microcrystals of diamond are synthesised by using high-pressure high-temperature treatment of a mixture of pertinent organic-inorganic precursors. Photoluminescence of SiV defects were investigated with the aim to use the mi…

TiO2:Sm3+ based luminescent oxygen sensitive probes in LDPE packaging material; pp. 450–454 Open

T Tikk, Tonis PAARA, Marko Eltermann, Andres Krumme, Raivo Jaaniso , et al. · 2017

In present work it was attempted to prepare luminescent TiO2:Sm3+ microprobes embedded into low density polyethylene (LDPE) films for real-time non-intrusive detection of oxygen contamination in plastic film of food packages with a long te…

Local strain-induced band gap fluctuations and exciton localization in aged WS2 monolayers Open

J. Krustok, Reelika Kaupmees, Raivo Jaaniso, V. Kiisk, I. Sildos , et al. · 2017

Optical properties of aged WS2 monolayers grown by CVD method on Si/SiO2 substrates are studied using temperature dependent photoluminescence and reflectance contrast spectroscopy. Aged WS2 monolayers have a typical surface roughness about…

Optical study of local strain related disordering in CVD-grown MoSe2 monolayers Open

J. Krustok, T. Raadik, Raivo Jaaniso, V. Kiisk, I. Sildos , et al. · 2016

We present temperature dependent micro-photoluminescence and room temperature photoreflectance spectroscopy studies on aged MoSe2 monolayers with high surface roughness. A0 and B0 exciton bands were detected at 1.512 eV and 1.72 eV, respec…

Graphene-Enhanced Raman Scattering from the Adenine Molecules Open

L. Dolgov, Denys Pidhirnyi, Г. И. Довбешко, Tetiana Lebedieva, V. Kiisk , et al. · 2016

An enhanced Raman scattering from a thin layer of adenine molecules deposited on graphene substrate was detected. The value of enhancement depends on the photon energy of the exciting light. The benzene ring in the structure of adenine mol…

Angular shaping of fluorescence from synthetic opal-based photonic crystal Open

Vitalii Boiko, Г. И. Довбешко, L. Dolgov, V. Kiisk, I. Sildos , et al. · 2016

Absorption, fluorescence and second harmonic generation in Cr3+-doped BiB3O6 glasses Open

Wojciech Kuźnik, I. G. Fuks, A. Wojciechowski, I.V. Kityk, V. Kiisk , et al. · 2015

Angular shaping of fluorescence from synthetic opal-based photonic crystal Open

Vitalii Boiko, Г. И. Довбешко, L. Dolgov, V. Kiisk, I. Sildos , et al. · 2015

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