uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Sensing of phosgene by a porous-like nanocrystalline diamond layer with buried metallic electrodes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Show others and affiliations
2013 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, Vol. 188, 675-680 p.Article in journal (Refereed) Published
Abstract [en]

Nanocrystalline diamond with a porous-like morphology was used as the functional part of a semiconductor gas sensor. The device function is based on the two-dimensional p-type surface conductivity of intrinsic diamond with a H-terminated surface. Metallic electrodes are buried beneath the diamond film. Therefore, these electrodes are protected from harmful substances, and the electronic connection is facilitated by grain boundaries. The gas sensing properties of the sensor structure were examined using oxidising gases (i.e., phosgene, humid air) at various operating temperatures. A pronounced and selective increase by two orders of magnitude was found in the surface conductivity after sensor exposure to phosgene gas (20 ppm) at 140 degrees C. Density functional theory calculations indicated no direct charge transfer between the phosgene molecule and diamond. We present a model in which phosgene indirectly yet efficiently increases the H3O+ concentration, which consequently leads to multiplied electron transfer and a pronounced sensor response. 

Place, publisher, year, edition, pages
2013. Vol. 188, 675-680 p.
Keyword [en]
Nanocrystalline diamond, Phosgene, Surface conductivity, Gas sensor, SEM
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-212336DOI: 10.1016/j.snb.2013.07.079ISI: 000326345600091OAI: oai:DiVA.org:uu-212336DiVA: diva2:677595
Available from: 2013-12-10 Created: 2013-12-09 Last updated: 2013-12-10Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Larsson, Karin
By organisation
Inorganic Chemistry
In the same journal
Sensors and actuators. B, Chemical
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 398 hits
ReferencesLink to record
Permanent link

Direct link