TY - JOUR
T1 - ZnO@ZIF-8
T2 - Gas sensitive core-shell hetero-structures show reduced cross-sensitivity to humidity
AU - Nair, Sreeja Sreedharan
AU - Illyaskutty, Navas
AU - Tam, Benjamin
AU - Yazaydin, A. Ozgur
AU - Emmerich, Katja
AU - Steudel, Annett
AU - Hashem, Tawheed
AU - Schöttner, Ludger
AU - Wöll, Christof
AU - Kohler, Heinz
AU - Gliemann, Hartmut
PY - 2020/2/1
Y1 - 2020/2/1
N2 - A ‘lawn-like’ distribution of interconnected zinc oxide nanorods, coated with a metal-organic compound based on zeolitic imidazolate frameworks – ZIF-8 was prepared on microstructured thin-film interdigitated Pt-electrodes forming ZnO@ZIF-8 core-shell heterostructures and investigated as gas sensor material in relation to the identical, but uncovered pure ZnO-layer. This composite combines the gas sensing properties of the metal oxide ZnO with the specific properties of the metal-organic framework material which result in a distinct change of the conditions of gas sensing at the ZnO/ZIF-8-interface. Herein, for the first time it is reported that as prepared ZnO@ZIF-8 composite material is an attractive choice to reduce the cross-sensitivity to water vapour (humidity) in the gas sensing response towards propene and ethene. The observed change of sensitivity in relation to uncovered ZnO is discussed to be due to (i) the specific interaction of the ZIF-8 at the interface with the ZnO taking influence on the gas reaction processes, (ii) the diffusivity of ZIF-8 for the different gas components, and (iii) the sorption behaviour of the used gases at the ZnO interface and inside the ZIF-8 material.
AB - A ‘lawn-like’ distribution of interconnected zinc oxide nanorods, coated with a metal-organic compound based on zeolitic imidazolate frameworks – ZIF-8 was prepared on microstructured thin-film interdigitated Pt-electrodes forming ZnO@ZIF-8 core-shell heterostructures and investigated as gas sensor material in relation to the identical, but uncovered pure ZnO-layer. This composite combines the gas sensing properties of the metal oxide ZnO with the specific properties of the metal-organic framework material which result in a distinct change of the conditions of gas sensing at the ZnO/ZIF-8-interface. Herein, for the first time it is reported that as prepared ZnO@ZIF-8 composite material is an attractive choice to reduce the cross-sensitivity to water vapour (humidity) in the gas sensing response towards propene and ethene. The observed change of sensitivity in relation to uncovered ZnO is discussed to be due to (i) the specific interaction of the ZIF-8 at the interface with the ZnO taking influence on the gas reaction processes, (ii) the diffusivity of ZIF-8 for the different gas components, and (iii) the sorption behaviour of the used gases at the ZnO interface and inside the ZIF-8 material.
KW - Cross-sensitivity
KW - Humidity
KW - Metal oxide gas sensors
KW - Metal-organic frameworks
KW - ZIF-8
KW - Zink oxide
UR - http://www.scopus.com/inward/record.url?scp=85074202880&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85074202880&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2019.127184
DO - 10.1016/j.snb.2019.127184
M3 - Article
AN - SCOPUS:85074202880
VL - 304
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
M1 - 127184
ER -