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Publications (10 of 153) Show all publications
Guziewicz, E., Paskaleva, A., Knez, M. & Österlund, L. (2018). Advanced Oxide Materials - Growth, Application, Characterization. Physica Status Solidi (a) applications and materials science, 215(16), Article ID 1800546.
Open this publication in new window or tab >>Advanced Oxide Materials - Growth, Application, Characterization
2018 (English)In: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 215, no 16, article id 1800546Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2018
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-363871 (URN)10.1002/pssa.201800546 (DOI)000442349000017 ()
Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2018-11-16Bibliographically approved
Qu, H.-Y., Primetzhofer, D., Qiu, Z., Österlund, L., Granqvist, C. G. & Niklasson, G. (2018). Cation/Anion-based electrochemical degradation and rejuvenation of electrochromic nickel oxide films. ChemElectroChem, 5(22), 3548-3556
Open this publication in new window or tab >>Cation/Anion-based electrochemical degradation and rejuvenation of electrochromic nickel oxide films
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2018 (English)In: ChemElectroChem, ISSN 2196-0216, Vol. 5, no 22, p. 3548-3556Article in journal (Refereed) Published
Abstract [en]

Ni oxide thin films are widely used in electrochromic (EC) devices with variable throughput of visible light and solarenergy. However, the mechanisms underlying the optical modulation – and its degradation under extended operationand subsequent rejuvenation – are poorly understood especially for Li+-conducting electrolytes. Here, we report a comprehensive study of the EC properties of sputter-deposited Ni oxide films immersed in an electrolyte of LiClO4 in propylene carbonate. Cyclic voltammetry and optical transmittance measurements were used to document degradation and subsequent potentiostatic rejuvenation. X-ray diffraction did not show evidence for accompanying changes in crystallinity, whereas vibrational spectroscopy indicated that degraded films had carbonaceous surface layers. Time-of-flight elastic recoil detection analysis demonstrated that both Li+ and Cl-based ions participate in the electrochromism and its degradation and rejuvenation. A major result was that degradation is associated with a reduced difference in the concentrations of Li+ and Cl based ions in the nickel oxide during extended electrochemical cycling, and rejuvenation of degraded films is achieved by removal of Li+ ions and accumulation of Cl-based anions to regain their initial concentration difference. Our work provides new insights into the use of ion-exchange-based devices incorporating nickel oxide.

Keywords
electrochromism, degradation, nickel oxide film, rejuvenation, ToF-ERDA
National Category
Engineering and Technology Physical Chemistry Condensed Matter Physics
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-368950 (URN)10.1002/celc.201800791 (DOI)000450042200027 ()
Funder
Swedish Research Council, 821-2012-5144Swedish Research Council, VR-2016-03713Swedish Foundation for Strategic Research , SSF-RIF14-0053
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-02-01Bibliographically approved
Henych, J., Stengl, V., Mattsson, A., Tolasz, J. & Österlund, L. (2018). Chemical warfare agent simulant DMMP reactive adsorption on TiO2/graphene oxide composites prepared via titanium peroxo-complex or urea precipitation. Journal of Hazardous Materials, 359, 482-490
Open this publication in new window or tab >>Chemical warfare agent simulant DMMP reactive adsorption on TiO2/graphene oxide composites prepared via titanium peroxo-complex or urea precipitation
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2018 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 359, p. 482-490Article in journal (Refereed) Published
Abstract [en]

Two water-based methods were used to produce TiO2/graphene oxide (GO) nanocomposites with 1 and 2 wt.% GO. Both procedures exclude the use of organometallic precursors, as well as the high-pressure and high-temperature treatments, which facilitate pure and energy efficient synthesis amenable for larger scale synthesis. Nanocomposites with narrow (< 10 nm) and long spindle-like (< 100 nm) TiO2 nanoparticles supported on GO flakes were obtained (TiO2/GO), and their properties for reactive destruction of the organophosphorus simile chemical warfare agent (CWA) dimethyl methylphosphonate (DMMP) were investigated by in situ DRIFTS spectroscopy. Both synthesis procedures yielded highly reactive nanocomposites with markedly different properties compared to similarly prepared pure TiO2 nanoparticles. GO also induced morphology and texture changes, which were observed to have a significant impact on the adsorption and reactivity of the nano composites, and which were strongly related to synthesis procedure. In particular, the reduction state of GO, as measured by Raman spectroscopy, was observed to play a major role for the reactivity of the TiO2/GO nano composites.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
TiO2, Graphene oxide, Chemical warfare agents, Organophosphates, In situ DRIFT spectroscopy
National Category
Materials Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-368448 (URN)10.1016/j.jhazmat.2018.07.095 (DOI)000446794400054 ()30075367 (PubMedID)
Available from: 2018-12-07 Created: 2018-12-07 Last updated: 2018-12-11Bibliographically approved
Piron, P., Vargas Catalan, E., Haas, J., Österlund, L., Nikolajeff, F., Andersson, P. O., . . . Karlsson, M. (2018). Development of a diamond waveguide sensor for sensitive protein analysis using IR quantum cascade lasers. In: Yakov G. Soskind (Ed.), SPIE Proceedings Volume 10539: Photonic Instrumentation, Engineering V. Paper presented at SPIE OPTO - Photonics West 2018 - Conference on Photonic Instrumentation Engineering V, San Francisco, CA, USA. January 27-February 1, 2018..
Open this publication in new window or tab >>Development of a diamond waveguide sensor for sensitive protein analysis using IR quantum cascade lasers
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2018 (English)In: SPIE Proceedings Volume 10539: Photonic Instrumentation, Engineering V / [ed] Yakov G. Soskind, 2018Conference paper, Oral presentation with published abstract (Refereed)
National Category
Engineering and Technology Physical Sciences Basic Medicine
Identifiers
urn:nbn:se:uu:diva-340857 (URN)10.1117/12.2289844 (DOI)000432598300012 ()978-1-5106-1564-9 (ISBN)
Conference
SPIE OPTO - Photonics West 2018 - Conference on Photonic Instrumentation Engineering V, San Francisco, CA, USA. January 27-February 1, 2018.
Funder
Carl Tryggers foundation Swedish Research Council, 6212014-5959EU, Horizon 2020, 645758
Available from: 2018-02-04 Created: 2018-02-04 Last updated: 2018-08-30Bibliographically approved
Sayhi, M., Ouerghi, O., Belgacem, K., Arbi, M., Tepeli, Y., Ghram, A., . . . Diouani, M. F. (2018). Electrochemical detection of influenza virus H9N2 based on both immunomagnetic extraction and gold catalysis using an immobilization-free screen printed carbon microelectrode. Biosensors & bioelectronics, 107, 170-177
Open this publication in new window or tab >>Electrochemical detection of influenza virus H9N2 based on both immunomagnetic extraction and gold catalysis using an immobilization-free screen printed carbon microelectrode
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2018 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 107, p. 170-177Article in journal (Refereed) Published
Abstract [en]

Influenza is a viral infectious disease considered as a source of many health problems and enormous socioeconomic disruptions. Conventional methods are inadequate for in-field detection of the virus and generally suffer from being laborious and time-consuming. Thus, studies aiming to develop effective alternatives to conventional methods are urgently needed. In this work, we developed an approach for the isolation and detection of influenza A virus subtype H9N2. For this aim, two specific influenza receptors were used. The first, anti-matrix protein 2 (M2) antibody, was attached to iron magnetic nanoparticles (MNPs) and used for the isolation of the virus from allantoic fluid. The second biomolecule, Fetuin A, was attached to an electrochemical detectable label, gold nanoparticles (AuNPs), and used to detect the virus tacking advantage from fetuin-hemagglutinin interaction. The MNP-Influenza virus-AuNP formed complex was isolated and treated by an acid solution then the collected gold nanoparticles were deposited onto a screen printed carbon electrode. AuNPs catalyzes the hydrogen ions reduction in acidic medium while applying an appropriate potential, and the generated current signal was proportional to the virus titer. This approach allows the rapid detection of influenza virus A/H9N2 at a less than 16 HAU titer.

Keywords
Influenza Virus A, H9N2, Biosensors, Nanoparticles, Chronoamperometry
National Category
Analytical Chemistry Nano Technology
Research subject
Chemistry with specialization in Analytical Chemistry; Chemistry with specialization in Bioorganic Chemistry; Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-346280 (URN)10.1016/j.bios.2018.02.018 (DOI)000428006900020 ()29455027 (PubMedID)
Funder
EU, Horizon 2020, 645758
Available from: 2018-03-16 Created: 2018-03-16 Last updated: 2018-06-20Bibliographically approved
Geremariam Welearegay, T., Cindemir, U., Österlund, L. & Ionescu, R. (2018). Fabrication and characterisation of ligand-functionalised ultrapure monodispersed metal nanoparticle nanoassemblies employing advanced gas deposition technique. Nanotechnology, 29(6), Article ID 065603.
Open this publication in new window or tab >>Fabrication and characterisation of ligand-functionalised ultrapure monodispersed metal nanoparticle nanoassemblies employing advanced gas deposition technique
2018 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 29, no 6, article id 065603Article in journal (Refereed) Published
Abstract [en]

Here, we report for the first time the fabrication of ligand-functionalised ultrapure monodispersed metal nanoparticles (Au, Cu, and Pt) from their pure metal precursors using the advanced gas deposition technique. The experimental conditions during nanoparticle formation were adjusted in order to obtain ultrafine isolated nanoparticles on different substrates. The morphology and surface analysis of the as-deposited metal nanoparticles were investigated using scanning electron microscopy, x-ray diffraction and Fourier transform infra-red spectroscopy, which demonstrated the formation of highly ordered pure crystalline nanoparticles with a relatively uniform size distribution of similar to 10 nm (Au), similar to 4 nm (Cu) and similar to 3 nm (Pt), respectively. A broad range of organic ligands containing thiol or amine functional groups were attached to the nanoparticles to form continuous networks of nanoparticle-ligand nanoassemblies, which were characterised by scanning electron microscopy and x-ray photoelectron spectroscopy. The electrical resistance of the functional nanoassemblies deposited in the gap spacing of two microfabricated parallel Au electrodes patterned on silicon substrates ranged between tens of k Omega and tens of M Omega, which is suitable for use in many applications including (bio)chemical sensors, surface-enhanced Raman spectroscopy and molecular electronic rectifiers.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2018
Keywords
metal nanoparticles, monodispersed, advanced gas deposition, molecularly-capped metal nanoparticles, self-assembled monolayers
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-341557 (URN)10.1088/1361-6528/aa9f65 (DOI)000419631700003 ()29206108 (PubMedID)
Available from: 2018-02-13 Created: 2018-02-13 Last updated: 2018-03-28Bibliographically approved
Welearegay, T. G., Diouani, M. F., Österlund, L., Ionescu, F., Belgacem, K., Smadhi, H., . . . Ionescu, R. (2018). Ligand-Capped Ultrapure Metal Nanoparticle Sensors for the Detection of Cutaneous Leishmaniasis Disease in Exhaled Breath. ACS Sensors, 3(12), 2532-2540
Open this publication in new window or tab >>Ligand-Capped Ultrapure Metal Nanoparticle Sensors for the Detection of Cutaneous Leishmaniasis Disease in Exhaled Breath
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2018 (English)In: ACS Sensors, Vol. 3, no 12, p. 2532-2540Article in journal (Refereed) Published
Abstract [en]

Human cutaneous leishmaniasis, although designated as one of the most neglected tropical diseases, remains underestimated due to its misdiagnosis. The diagnosis is mainly based on the microscopic detection of amastigote forms, isolation of the parasite, or the detection of LeishmaniaDNA, in addition to its differential clinical characterization; these tools are not always available in routine daily practice, and they are expensive and time-consuming. Here, we present a simple-to-use, noninvasive approach for human cutaneous leishmaniasis diagnosis, which is based on the analysis of volatile organic compounds in exhaled breath with an array of specifically designed chemical gas sensors. The study was realized on a group of n = 28 volunteers diagnosed with human cutaneous leishmaniasis and a group of n = 32 healthy controls, recruited in various sites from Tunisia, an endemic country of the disease. The classification success rate of human cutaneous leishmaniasis patients achieved by our sensors test was 98.2% accuracy, 96.4% sensitivity, and 100% specificity. Remarkably, one of the sensors, based on CuNPs functionalized with 2-mercaptobenzoxazole, yielded 100% accuracy, 100% sensitivity, and 100% specificity for human cutaneous leishmaniasis discrimination. While AuNPs have been the most extensively used in metal nanoparticle–ligand sensing films for breath sensing, our results demonstrate that chemical sensors based on ligand-capped CuNPs also hold great potential for breath volatile organic compounds detection. Additionally, the chemical analysis of the breath samples with gas chromatography coupled to mass spectrometry identified nine putative breath biomarkers for human cutaneous leishmaniasis.

Keywords
biomarkers; chemical gas sensors; diagnosis; exhaled breath analysis; human cutaneous leishmaniasis; metal nanoparticles−ligand nanoassemblies
National Category
Medical Laboratory and Measurements Technologies
Research subject
Engineering Science with specialization in Solid State Physics; Chemistry with specialization in Analytical Chemistry; Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-370080 (URN)10.1021/acssensors.8b00759 (DOI)000454962400009 ()30403135 (PubMedID)
Projects
Tropsense
Funder
EU, Horizon 2020, 645758
Note

De tre första författarna delar förstaförfattarskapet.

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2019-01-25Bibliographically approved
Österlund, L., Mattsson, A., Ji, Y.-X. -., Niklasson, G. & Granqvist, C. G. (2018). Novel multi-functional self-cleaning, air cleaning and thermochromic films for the built environment. In: FMNT Functional Materials and Nanotechnologies: Book of Abstracts. Paper presented at 12th International Scientific Conference on Functional Materials and Nanotechnologies (FM & NT-2018), Riga, Latvia,, 2018. (pp. 63). , Article ID INV-10.
Open this publication in new window or tab >>Novel multi-functional self-cleaning, air cleaning and thermochromic films for the built environment
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2018 (English)In: FMNT Functional Materials and Nanotechnologies: Book of Abstracts, 2018, p. 63-, article id INV-10Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Spectrally selective photocatalytic multilayer films that exhibit dramatically enhanced photochemical reactivity upon solar light activation were fabricated. It is shown that synergistically enhanced physciochemcial properties can be achieved the surpass those of the constituting single-layer films. We present two case studies: TiO2/VO2 and TiO2/TiAlN bilayer films made by reactive dc magnetron sputtering. The TiO2/VO2 bilayer exhibits enhanced near-infrared light absorption, which thereby heats the TiO2 film by more than 15 degrees, resulting in an almost 2-fold increase of the reaction rate for photo-degradation of stearic acid layers. In addition, the TiO2/VO2 bilayer stack exhibited anti-reflective properties, and enhanced solar modulation (∼ 9%) compared to VO2, and ∼ 20% increased solar absorptance compared to TiO2. In the second example, bilayer TiO2/TiAlN films yielded an almost 10-fold enhancement of the quantum yield for acetaldehyde removal (on par with state-of-the-art, heterojunction photocatalysts), and an associated temperature rise larger than 120 degrees. Both findings can be understood by thermal activation to the increase the surface reaction kinetics, where water desorption from the oxide plays and important role. We generalize the results, and discuss their implications for green building technology and possible scenarios for their implementation.

References

1. Yu-Xia Ji, Andreas Mattsson, Gunnar A. Niklasson, Claes-Göran Granqvist, Lars Österlund TiO2/VO2 bilayer coatings for glazing: Synergetically enhanced photocatalytic, thermochromic, and luminous properties, submitted to Advanced Functional Materials 2018.

2. Lars Österlund, Andreas Mattsson, Joel Martin, Spectrally selective heat absorptive bilayer photocatalyst with enhanced reactivity: TiO2/TiAlN, Topics in Catalysis, in press.

National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-368966 (URN)
Conference
12th International Scientific Conference on Functional Materials and Nanotechnologies (FM & NT-2018), Riga, Latvia,, 2018.
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-17
Montero, J. A. & Österlund, L. (2018). Photodegradation of Stearic Acid Adsorbed on Copper Oxide Heterojunction Thin Films Prepared by Magnetron Sputtering. ChemEngineering, 2(3), Article ID 40.
Open this publication in new window or tab >>Photodegradation of Stearic Acid Adsorbed on Copper Oxide Heterojunction Thin Films Prepared by Magnetron Sputtering
2018 (English)In: ChemEngineering, Vol. 2, no 3, article id 40Article in journal (Refereed) Published
Abstract [en]

Nanocrystalline copper oxide thin films were fabricated by reactive DC magnetron sputtering. The structure and optical properties of the films were measured with X-ray diffraction, scanning electron microscopy, and spectrophotometry. Variations of oxygen partial pressure resulted in oxide composition ranging from Cu, Cu-Cu2O, Cu2O-CuO1−x, and CuO. Optical band transitions at 2.06 eV and 2.55 eV were found for Cu2O corresponding to the direct forbidden and direct allowed interband transitions. For CuO an indirect allowed interband transition was found at 1.28 eV. The photocatalytic activity was determined by quantifying the rate constant and quantum yield (destroyed molecules/photons absorbed) under stearic acid degradation. Photocatalytic activity was found to be highest in mixed-phase films with Cu-Cu2O films the highest. Results from post-annealed Cu-Cu2O and CuO films show similar results. We interpret our results as being due to efficient electron-hole charge separation in the heterojunction films. The obtained quantum yields were generally about ten times lower than for comparable dense TiO2 and WO3 binary oxides, which calls for further studies of the spectral dependence of the quantum yield and electron-hole pair life times for oxides with different purity levels.

Place, publisher, year, edition, pages
MDPI, 2018
Keywords
photocatalysis; copper oxide; heterojunction; stearic acid
National Category
Materials Engineering
Research subject
Engineering Science with specialization in Solid State Physics; Chemistry with specialization in Materials Chemistry; Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-370083 (URN)10.3390/chemengineering2030040 (DOI)
Funder
Swedish Research Council, 2016-05904
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-19Bibliographically approved
Haas, J., Vargas Catalan, E., Piron, P., Nikolajeff, F., Österlund, L., Karlsson, M. & Mizaikoff, B. (2018). Polycrystalline diamond thin-film waveguides for mid-infrared evanescent field sensors. ACS Omega, 3(6), 6190-6198
Open this publication in new window or tab >>Polycrystalline diamond thin-film waveguides for mid-infrared evanescent field sensors
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2018 (English)In: ACS Omega, ISSN 2470-1343, Vol. 3, no 6, p. 6190-6198Article in journal (Refereed) Published
Abstract [en]

Photonic design and optimization of thin-film polycrystalline diamond waveguides are shown, serving as advanced evanescent field transducers in the mid-infrared fingerprint regime (2000-909 cm(-1); 5-11 mu m). Design constraints inherent to optical/system considerations and the material were implemented in a finite element method (FEM)-based simulation method that allowed three-dimensional modeling of the overall structure. Thus, lateral mode confinement, attenuation in the direction of radiation propagation, and physical resilience were evaluated. In a final step, the designed structures were fabricated, and their utility in combination with a broadly tunable external cavity quantum cascade laser for chemical sensing of a liquid phase analyte was demonstrated.

National Category
Analytical Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-346523 (URN)10.1021/acsomega.8b00623 (DOI)000436340500029 ()
Funder
Carl Tryggers foundation Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC), 2016-7-107
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-10-12Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0296-5247

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