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Electrochemically Synthesised Pd- and Au-nanoparticles as sensing layers in NOx-sensitive field effect devices
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad Fysik. Linköpings universitet, Tekniska högskolan.
Dipartimento di Chimica, Università degli Studi di Bari, Bari, Italy.
Dipartimento di Chimica, Università degli Studi di Bari, Bari, Italy.
Dipartimento di Chimica, Università degli Studi di Bari, Bari, Italy.
Visa övriga samt affilieringar
2008 (Svenska)Ingår i: Smart Sensors and Sensing Technology / [ed] Subhas Chandra Mukhopadhyay and Gourab Sen Gupta, Berlin, Heidelberg: Springer , 2008, s. 63-75Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Abstract [en]

An environmental pollutant of great concern is NOx (nitrogen monoxide and nitrogen dioxide). Here we report the utilisation of electrochemically synthesised gold and palladium nanoparticles as catalytically active gate material on gas sensitive field effect sensor devices. The synthesised nanoparticles have been characterised by TEM and XPS, and the morphology of the thermally treated nanostructured sensing layers has been investigated using SEM and XPS. Measurements on the gas response of the palladium as well as the gold nanoparticle sensors towards a number of analytes found in automotive gas exhausts were performed and their response patterns were compared. The initial gas response measurements show interesting sensing properties for both the gold and the palladium nanoparticle sensors towards NOx detection.

Ort, förlag, år, upplaga, sidor
Berlin, Heidelberg: Springer , 2008. s. 63-75
Serie
Lecture notes in Electrical Engineering, ISSN 1876-1100 ; 20
Nyckelord [en]
NOx- sensor · gold · palladium · nanoparticle · field effect sensor
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:liu:diva-44313DOI: 10.1007/978-3-540-79590-2_5Lokalt ID: 76301ISBN: 978-3-540-79589-6 (tryckt)ISBN: 978-3-540-79590-2 (tryckt)OAI: oai:DiVA.org:liu-44313DiVA, id: diva2:265175
Konferens
The 2nd International Conference on Sensing Technology, ICST 2007, November 26-28, Massey, New Zealand
Tillgänglig från: 2009-10-10 Skapad: 2009-10-10 Senast uppdaterad: 2016-06-13Bibliografiskt granskad
Ingår i avhandling
1. Nanostructured materials for gas sensing applications
Öppna denna publikation i ny flik eller fönster >>Nanostructured materials for gas sensing applications
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In this Thesis I have investigated the use of nanostructured films as sensing and contact layers for field effect gas sensors in order to achieve high sensitivity, selectivity, and long term stability of the devices in corrosive environments at elevated temperatures. Electrochemically synthesized Pd and Au nanoparticles deposited as sensing layers on capacitive field effect devices were found to give a significant response to NOx with small, or no responses to H2, NH3, and C3H6. Pt nanoparticles incorporated in a TiC matrix are catalytically active, but the agglomeration and migration of the Pt particles towards the substrate surface reduces the activity of the sensing layer. Magnetron sputtered epitaxial films from the Ti-Si-C and the Ti-Ge-C systems were grown on 4H-SiC substrates in order to explore their potential as high temperature stable ohmic contact materials to SiC based field effect gas sensors. Ti3SiC2 thin films deposited on 4H-SiC substrates were found to yield ohmic contacts to n-type SiC after a high temperature rapid thermal anneal at 950 ºC. Investigations on the growth mode of Ti3SiC2 thin films with varying Si content on 4H-SiC substrates showed the growth to be lateral step-flow with the propagation of steps with a height as small as half a unit cell. The amount of Si present during deposition leads to differences in surface faceting of the films and Si-supersaturation conditions gives growth of Ti3SiC2 films with the presence of TiSi2 crystallites. Current-voltage measurements of the as-deposited Ti3GeC2 films indicate that this material is also a promising candidate for achieving long term stable contact layers to 4H-SiC for operation at elevated temperatures in corrosive environments. Further investigations into the Ti-Ge-C system showed that the previously unreported solid solutions of (Ti,V)2GeC, (Ti,V)3GeC2 and (Ti,V)4GeC3 can be synthesized, and it was found that the growth of these films is affected by the nature of the substrate.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2011. s. 61
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1377
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:liu:diva-69641 (URN)9789173931403 (ISBN)
Disputation
2011-09-09, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2011-07-08 Skapad: 2011-07-08 Senast uppdaterad: 2019-12-19Bibliografiskt granskad

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Buchholt, KristinaSöderlind, FredrikKäll, Per-OlovLloyd Spetz, Anita

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