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Cindemir, U., Topalian, Z., Granqvist, C. G., Österlund, L. & Niklasson, G. (2019). Characterization of nanocrystalline-nanoporous nickel oxide thin films prepared by reactive advanced gas deposition. Materials Chemistry and Physics, 227, 98-104
Open this publication in new window or tab >>Characterization of nanocrystalline-nanoporous nickel oxide thin films prepared by reactive advanced gas deposition
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2019 (English)In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 227, p. 98-104Article in journal (Refereed) Published
Abstract [en]

Nanocrystalline-nanoporous Ni oxide is of much interest for gas sensors and other applications. Reactive advanced gas deposition (AGD) stands out as a particularly promising technique for making thin films of this material owing to the techniques ability to separate between the growth of individual nanoparticles and their subsequent deposition to create a consolidated material on a substrate. Here we report on the characterization of Ni oxide films, made by reactive AGD, by several methods. X-ray diffractometry showed that the films had a face centered cubic NiO structure, and scanning electron microscopy indicated a compact nanoparticulate composition. X-ray photoelectron spectroscopy showed the presence of Ni3+ and demonstrated that these states became less prominent upon heat treatment in air. Extended x-ray absorption fine structure analysis elucidated the local atomic structure; in particular, data on interatomic distances and effects of annealing on local disorder showed that the Ni oxide nanoparticles crystallize upon annealing while maintaining their nanoparticle morphology, which is a crucial feature for reproducible fabrication of Ni oxide thin films for gas sensors. Importantly, several techniques demonstrated that grain growth remained modest for annealing temperatures as high as 400 degrees C for 1700-nm-thick films. The present article is a sequel to an earlier one [U. Cindemir et al., Sensors and Actuators B 242 (2017) 132-139] in which we reported on fluctuation-enhanced and conductometric gas sensing with Ni oxide films prepared by AGD.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, 2019
Keywords
Nickel oxide, Advanced gas deposition, EXAFS, Atomic structure, Gas sensor
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-387223 (URN)10.1016/j.matchemphys.2019.01.058 (DOI)000466617800013 ()
Funder
EU, FP7, Seventh Framework Programme, 267234
Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-06-25Bibliographically approved
Geremariam Welearegay, T., Diouani, M. F., Österlund, L., Borys, S., Khaled, S., Smadhi, H., . . . Ionescu, R. (2019). Diagnosis of Human Echinococcosis via Exhaled Breath Analysis: A Promise for Rapid Diagnosis of Infectious Diseases Caused by Helminths. Journal of Infectious Diseases, 219(1), 101-109
Open this publication in new window or tab >>Diagnosis of Human Echinococcosis via Exhaled Breath Analysis: A Promise for Rapid Diagnosis of Infectious Diseases Caused by Helminths
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2019 (English)In: Journal of Infectious Diseases, ISSN 0022-1899, E-ISSN 1537-6613, Vol. 219, no 1, p. 101-109Article in journal (Refereed) Published
Abstract [en]

Background: Human echinococcosis is a neglected infectious disease affecting more than 1 million people globally. Its diagnosis is expensive and difficult because of lack of adequate resources in low-resource locations, where most cases occur.

Methods: A group of volunteers diagnosed with the 2 main types of echinococcosis and corresponding control groups were recruited from hospitals in Tunisia (32 patients with cystic echinococcosis and 43 controls) and Poland (16 patients with alveolar echinococcosis and 8 controls). Breath samples were collected from all patients and analyzed by gas chromatography coupled to mass spectrometry, and a specifically developed electronic nose system.

Results: The chemical analysis revealed statistically different concentrations of 2 compounds in the breath of patients with cystic echinococcosis compared to controls, and statistically different concentrations of 7 compounds in the breath of patients with alveolar echinococcosis compared to controls. The discrimination accuracy achieved by the electronic nose system was 100% for cystic echinococcosis and 92.9% for alveolar echinococcosis, while the discrimination accuracy between these 2 patient groups was 92.1%.

Conclusion: Here we advocate a noninvasive, fast, easy-to-operate and nonexpensive diagnostic tool for the diagnosis of human echinococcosis disease through exhaled breath analysis, suitable for early diagnosis and population screening.

Keywords
echinococcosis, diagnosis, breath analysis, biomarkers, chemical sensors
National Category
Infectious Medicine
Identifiers
urn:nbn:se:uu:diva-378686 (URN)10.1093/infdis/jiy449 (DOI)000458610200014 ()30016445 (PubMedID)
Funder
EU, Horizon 2020, 645758
Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-03-12Bibliographically approved
Arvizu, M. A., Qu, H.-Y., Cindemir, U., Qiu, Z., Rojas González, E. A., Primetzhofer, D., . . . Niklasson, G. (2019). Electrochromic WO3 thin films attain unprecedented durability by potentiostatic pretreatment. Journal of Materials Chemistry A, 7(6), 2908-2918
Open this publication in new window or tab >>Electrochromic WO3 thin films attain unprecedented durability by potentiostatic pretreatment
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2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 6, p. 2908-2918Article in journal (Refereed) Published
Abstract [en]

Electrochromic windows and glass facades are able to impart energy efficiency jointly with indoor comfort and convenience. Long-term durability is essential for practical implementation of this technology and has recently attracted broad interest. Here we show that a simple potentiostatic pretreatment of sputterdeposited thin films of amorphous WO3-the most widely studied electrochromic material-can yield unprecedented durability for charge exchange and optical modulation under harsh electrochemical cycling in a Li-ion-conducting electrolyte and effectively evades harmful trapping of Li. The pretreatment consisted of applying a voltage of 6.0 V vs. Li/Li+ for several hours to a film backed by a transparent conducting In2O3: Sn layer. Associated compositional and structural modifications were probed by several techniques, and improved durability was associated with elemental intermixing at the WO3/ITO and ITO/glass boundaries as well as with carbonaceous solid-electrolyte interfacial layers on the WO3 films. Our work provides important new insights into long-term durability of ion-exchange-based devices.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-378529 (URN)10.1039/c8ta09621j (DOI)000457893400054 ()
Funder
EU, European Research Council, 267234Swedish Research Council, 821-2012-5144Swedish Research Council, 2017-00646_9Swedish Foundation for Strategic Research , RIF14-0053
Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-03-22Bibliographically approved
Henych, J., Mattsson, A., Tolasz, J., Stengl, V. & Österlund, L. (2019). Solar light decomposition of warfare agent simulant DMMP on TiO2/graphene oxide nanocomposites. Catalysis Science & Technology, 9(8), 1816-1824
Open this publication in new window or tab >>Solar light decomposition of warfare agent simulant DMMP on TiO2/graphene oxide nanocomposites
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2019 (English)In: Catalysis Science & Technology, ISSN 2044-4753, E-ISSN 2044-4761, Vol. 9, no 8, p. 1816-1824Article in journal (Refereed) Published
Abstract [en]

Solar light-induced photodecomposition of organophosphorus warfare agent simulant dimethyl methylphosphonate (DMMP) on the surfaces of TiO2/graphene oxide (GO) nanocomposites was studied by in situ DRIFT spectroscopy. Nanocomposites containing 1 and 2 wt% GO, respectively, were prepared by two different aqueous methods. All nanocomposites were shown to effectively adsorb and partly dissociate DMMP as shown by the formation of surface coordinated methoxy groups. Solar light illumination induced rapid decomposition of the adsorbed species to yield various ionic and surface coordinated formate and carbonate species as the main intermediate products. Both the kinetics of adsorbed species decomposition and the formation of various intermediates were strongly affected by the presence of GO, as compared to pure TiO2 nanoparticles. The two synthesis routes yielded nanocomposites with different degrees of reduction of GO that correlated with their reactivity towards DMMP adsorption and photodegradation. Upon illumination, rapid depletion of water was observed on the TiO2/GO nanocomposites and was attributed to a water splitting reaction, which competed with the DMMP photo-oxidation reaction.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Physical Chemistry Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-383187 (URN)10.1039/c9cy00059c (DOI)000465404200007 ()
Funder
Swedish Research Council, 2016-05904
Available from: 2019-07-25 Created: 2019-07-25 Last updated: 2019-07-25Bibliographically approved
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
Physical Chemistry Condensed Matter Physics Other Engineering and Technologies not elsewhere specified
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: 2019-03-19Bibliographically 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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0296-5247

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