Porous Nickel Oxide Sensor for Formaldehyde Detection
2014 (English)In: European Materials Society (E-MRS) Spring Meeting, Lille, France, May 26-30, 2014.: Symposium B: Advanced functional materials for environmental monitoring and applications., 2014Conference paper, Poster (Other academic)
Formaldehyde is a volatile organic compound, which is a harmful indoor pollutant, causing sick building syndrome (SBS) and is released from household and building materials. Since higher concentrations of formaldehyde are considered to be carcinogenic, monitoring them indoors is of great importance. Advanced gas deposition has here been used 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 of the films was investigated with scanning electron microscopy, and the porosity was determined by nitrogen adsorption isotherms with the Brunauer-Emmett-Teller method. The particle size was found to be less than 10 nm, as determined by x-ray diffraction. X-ray photoelectron spectroscopy of the NiO films was also done. Gas sensing measurements were done using a total gas flow rate of 200 ml/min. Resistivity values of sensors were recorded with formaldehyde diluted in synthetic air. Sensor resistances were recorded at 50 ppm, 25ppm, 10ppm and 5 ppm formaldehyde concentration. NiO films showed promising formaldehyde gas sensing properties implying lower levels of detection limit.
Place, publisher, year, edition, pages
, European Materials Society (E-MRS) Spring Meeting, B.PI 21
Engineering and Technology Nano Technology Chemical Engineering Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Engineering Science with specialization in Solid State Physics
IdentifiersURN: urn:nbn:se:uu:diva-237555OAI: oai:DiVA.org:uu-237555DiVA: diva2:768225
European Materials Society (E-MRS) Spring Meeting, Lille, France, May 26-30, 2014.
FunderEU, FP7, Seventh Framework Programme, 267234