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Porous Nickel Oxide Film Sensor for Formaldehyde
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2014 (English)In: INERA Workshop: Transition Metal Oxides as Functional Layers in Smart windows and Water Splitting Devices / Parallel session of the 18th International School on Condensed Matter Physics, 2014, UNSP 012012- p.Conference paper, Published paper (Refereed)
Abstract [en]

Formaldehyde is a volatile organic compound and a harmful indoor pollutant contributing to the "sick building syndrome". We used advanced gas deposition to fabricate highly porous nickel oxide (NiO) thin films for formaldehyde sensing. The films were deposited on Al2O3 substrates with prefabricated comb-structured electrodes and a resistive heater at the opposite face. The morphology and structure of the films were investigated with scanning electron microscopy and X-ray diffraction. Porosity was determined by nitrogen adsorption isotherms with the Brunauer-Emmett-Teller method. Gas sensing measurements were performed to demonstrate the resistive response of the sensors with respect to different concentrations of formaldehyde at 150 degrees C.

Place, publisher, year, edition, pages
2014. UNSP 012012- p.
Series
Journal of Physics Conference Series, ISSN 1742-6588 ; 559
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-237084DOI: 10.1088/1742-6596/559/1/012012ISI: 000346420600012OAI: oai:DiVA.org:uu-237084DiVA: diva2:766351
Conference
INERA Workshop on Transition Metal Oxides as Functional Layers in Smart windows and Water Splitting Devices / Parallel session of the 18th International School on Condensed Matter Physics, sep 4-6, 2014, Varna, Bulgaria
Available from: 2014-11-26 Created: 2014-11-26 Last updated: 2016-10-14Bibliographically approved
In thesis
1. Thin films for indoor air monitoring: Measurements of Volatile Organic Compounds
Open this publication in new window or tab >>Thin films for indoor air monitoring: Measurements of Volatile Organic Compounds
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Volatile organic compounds (VOCs) in the indoor air have adverse effects on the dwellers residing in a building or a vehicle. One of these effects is called sick building syndrome (SBS). SBS refers to situations in which the users of a building develop acute health effects and discomfort depending on the time they spend inside some buildings without having any specific illness. Furthermore, monitoring volatile organic compounds could lead to early diagnosis of specific illnesses through breath analysis. Among those VOCs formaldehyde, acetaldehyde can be listed.

In this thesis, VOC detecting thin film sensors have been investigated. Such sensors have been manufactured using semiconducting metal oxides, ligand activated gold nanoparticles and Graphene/TiO2 mixtures. Advanced gas deposition unit, have been used to produce NiO thin films and Au nanoparticles. DC magnetron sputtering has been used to produce InSnO and VO2 thin film sensors. Graphene/TiO2 sensors have been manufactured using doctor-blading.

While presenting the results, first, material characterization details are presented for each sensor, then, gas sensing results are presented. Morphologies, crystalline structures and chemical properties have been analyzed using scanning electron microscopy, X-ray diffraction and X-ray photo electron spectroscopy. Furthermore, more detailed analyses have been performed on NiO samples using extended X-ray absorption fine structure method and N2 adsorption measurements. Gas sensing measurements were focused on monitoring formaldehyde and acetaldehyde. However, responses ethanol and methane were measured in some cases to monitor selectivity. Graphene/TiO2 samples were used to monitor NO2 and NH3. For NiO thin film sensors and Au nano particles, fluctuation enhanced gas sensing is also presented in addition to conductometric measurements. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 78 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1422
Keyword
gas sensor, thin film, adcanced gas depostion, sputter deposition, nickel oxide, gold nanoparticles, indium tin oxide, acetaldehyde, formaldehyde
National Category
Nano Technology
Identifiers
urn:nbn:se:uu:diva-302558 (URN)978-91-554-9683-8 (ISBN)
Public defence
2016-10-21, Room Å2001, Ångströmlaboratoriet, Lägerhyddsv 1, 13:15 (English)
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, 267234
Available from: 2016-09-28 Created: 2016-09-06 Last updated: 2016-10-14Bibliographically approved

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Cindemir, UmutTopalian, ZarehÖsterlund, LarsGranqvist, Claes-GöranGunnar, Niklasson

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