Details
| Original language | English |
|---|---|
| Pages (from-to) | 3424-3437 |
| Number of pages | 14 |
| Journal | Advanced functional materials |
| Volume | 26 |
| Issue number | 20 |
| Early online date | 8 Apr 2016 |
| Publication status | Published - 24 May 2016 |
Abstract
Atmospheric contamination with organic compounds is undesired in industry and in society because of odor nuisance or potential toxicity. Resistive gas sensors made of semiconducting metal oxides are effective in the detection of gases even at low concentration. Major drawbacks are low selectivity and missing sensitivity toward a targeted compound. Acetaldehyde is selected due to its high relevance in chemical industry and its toxic character. Considering the similarity between gas-sensing and heterogeneous catalysis (surface reactions, activity, selectivity), it is tempting to transfer concepts. A question of importance is how doping and the resulting change in electronic properties of a metal-oxide support with semiconducting properties alters reactivity of the surfaces and the functionality in gas-sensing and in heterogeneous catalysis. A gas-phase synthesis method is employed for aerogel-like zinc oxide materials with a defined content of aluminum (n-doping), which were then used for the assembly of gas sensors. It is shown that only Al-doped ZnO represents an effective sensor material that is sensitive down to very low concentrations (<350 ppb). The advance in properties relates to a catalytic effect for the doped semiconductor nanomaterial. Doping of a semiconductor nose: Gas-sensors assembled from hollow ZnO aerogels can be made sensitive for new compounds like acetaldehyde via chemical doping with aluminum, which not only leads to effective n-doping but also results in a catalytic effect.
Keywords
- aerosol synthesis, gas sensors, nanoporous materials, semiconductor nanostructures, transparent conducting oxides
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Advanced functional materials, Vol. 26, No. 20, 24.05.2016, p. 3424-3437.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Catalytically Doped Semiconductors for Chemical Gas Sensing: Aerogel-Like Aluminum-Containing Zinc Oxide Materials Prepared in the Gas Phase
AU - Hagedorn, Kay
AU - Li, Wenyu
AU - Liang, Qijun
AU - Dilger, Stefan
AU - Noebels, Matthias
AU - Wagner, Markus R.
AU - Reparaz, Juan S.
AU - Dollinger, Andreas
AU - Günne, Jörn Schmedt auf der
AU - Dekorsy, Thomas
AU - Schmidt-Mende, Lukas
AU - Polarz, Sebastian
N1 - Publisher Copyright: © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2016/5/24
Y1 - 2016/5/24
N2 - Atmospheric contamination with organic compounds is undesired in industry and in society because of odor nuisance or potential toxicity. Resistive gas sensors made of semiconducting metal oxides are effective in the detection of gases even at low concentration. Major drawbacks are low selectivity and missing sensitivity toward a targeted compound. Acetaldehyde is selected due to its high relevance in chemical industry and its toxic character. Considering the similarity between gas-sensing and heterogeneous catalysis (surface reactions, activity, selectivity), it is tempting to transfer concepts. A question of importance is how doping and the resulting change in electronic properties of a metal-oxide support with semiconducting properties alters reactivity of the surfaces and the functionality in gas-sensing and in heterogeneous catalysis. A gas-phase synthesis method is employed for aerogel-like zinc oxide materials with a defined content of aluminum (n-doping), which were then used for the assembly of gas sensors. It is shown that only Al-doped ZnO represents an effective sensor material that is sensitive down to very low concentrations (<350 ppb). The advance in properties relates to a catalytic effect for the doped semiconductor nanomaterial. Doping of a semiconductor nose: Gas-sensors assembled from hollow ZnO aerogels can be made sensitive for new compounds like acetaldehyde via chemical doping with aluminum, which not only leads to effective n-doping but also results in a catalytic effect.
AB - Atmospheric contamination with organic compounds is undesired in industry and in society because of odor nuisance or potential toxicity. Resistive gas sensors made of semiconducting metal oxides are effective in the detection of gases even at low concentration. Major drawbacks are low selectivity and missing sensitivity toward a targeted compound. Acetaldehyde is selected due to its high relevance in chemical industry and its toxic character. Considering the similarity between gas-sensing and heterogeneous catalysis (surface reactions, activity, selectivity), it is tempting to transfer concepts. A question of importance is how doping and the resulting change in electronic properties of a metal-oxide support with semiconducting properties alters reactivity of the surfaces and the functionality in gas-sensing and in heterogeneous catalysis. A gas-phase synthesis method is employed for aerogel-like zinc oxide materials with a defined content of aluminum (n-doping), which were then used for the assembly of gas sensors. It is shown that only Al-doped ZnO represents an effective sensor material that is sensitive down to very low concentrations (<350 ppb). The advance in properties relates to a catalytic effect for the doped semiconductor nanomaterial. Doping of a semiconductor nose: Gas-sensors assembled from hollow ZnO aerogels can be made sensitive for new compounds like acetaldehyde via chemical doping with aluminum, which not only leads to effective n-doping but also results in a catalytic effect.
KW - aerosol synthesis
KW - gas sensors
KW - nanoporous materials
KW - semiconductor nanostructures
KW - transparent conducting oxides
UR - http://www.scopus.com/inward/record.url?scp=84981764238&partnerID=8YFLogxK
U2 - 10.1002/adfm.201505355
DO - 10.1002/adfm.201505355
M3 - Article
VL - 26
SP - 3424
EP - 3437
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 20
ER -