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 -