---
_id: '25941'
abstract:
- lang: eng
text: Ordered mesoporous In2O3 particles of variable size synthesized by the nanocasting
method are used for preparation of resistive gas-sensing layers. Light activation
by a LED (blue light, 460 nm) permits room-temperature ozone sensing. Apart from
differences in base-line resistance in sensing layers containing small (diameter
approx. 170 nm) or large particles (approx. 870 nm), differences in the response
amplitude and response time constant are also observed. Signal stabilization is
achieved faster for small particles. In addition, sensors show a particle size-dependent
reaction threshold for low ozone concentration. Larger particles show negligible
response to 50 ppb ozone whereas a significant response is observed for the small-particle
sensors. A simple model based on geometrical properties and formation of depletion
layers explaining the observed behavior is presented.
article_type: original
author:
- first_name: Dominik
full_name: Klaus, Dominik
last_name: Klaus
- first_name: Danielle
full_name: Klawinski, Danielle
last_name: Klawinski
- first_name: Sabrina
full_name: Amrehn, Sabrina
last_name: Amrehn
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
- first_name: Thorsten
full_name: Wagner, Thorsten
last_name: Wagner
citation:
ama: 'Klaus D, Klawinski D, Amrehn S, Tiemann M, Wagner T. Light-activated resistive
ozone sensing at room temperature utilizing nanoporous In2O3 particles: Influence
of particle size. Sensors and Actuators B: Chemical. Published online 2015:181-185.
doi:10.1016/j.snb.2014.09.021'
apa: 'Klaus, D., Klawinski, D., Amrehn, S., Tiemann, M., & Wagner, T. (2015).
Light-activated resistive ozone sensing at room temperature utilizing nanoporous
In2O3 particles: Influence of particle size. Sensors and Actuators B: Chemical,
181–185. https://doi.org/10.1016/j.snb.2014.09.021'
bibtex: '@article{Klaus_Klawinski_Amrehn_Tiemann_Wagner_2015, title={Light-activated
resistive ozone sensing at room temperature utilizing nanoporous In2O3 particles:
Influence of particle size}, DOI={10.1016/j.snb.2014.09.021},
journal={Sensors and Actuators B: Chemical}, author={Klaus, Dominik and Klawinski,
Danielle and Amrehn, Sabrina and Tiemann, Michael and Wagner, Thorsten}, year={2015},
pages={181–185} }'
chicago: 'Klaus, Dominik, Danielle Klawinski, Sabrina Amrehn, Michael Tiemann, and
Thorsten Wagner. “Light-Activated Resistive Ozone Sensing at Room Temperature
Utilizing Nanoporous In2O3 Particles: Influence of Particle Size.” Sensors
and Actuators B: Chemical, 2015, 181–85. https://doi.org/10.1016/j.snb.2014.09.021.'
ieee: 'D. Klaus, D. Klawinski, S. Amrehn, M. Tiemann, and T. Wagner, “Light-activated
resistive ozone sensing at room temperature utilizing nanoporous In2O3 particles:
Influence of particle size,” Sensors and Actuators B: Chemical, pp. 181–185,
2015, doi: 10.1016/j.snb.2014.09.021.'
mla: 'Klaus, Dominik, et al. “Light-Activated Resistive Ozone Sensing at Room Temperature
Utilizing Nanoporous In2O3 Particles: Influence of Particle Size.” Sensors
and Actuators B: Chemical, 2015, pp. 181–85, doi:10.1016/j.snb.2014.09.021.'
short: 'D. Klaus, D. Klawinski, S. Amrehn, M. Tiemann, T. Wagner, Sensors and Actuators
B: Chemical (2015) 181–185.'
date_created: 2021-10-08T15:48:52Z
date_updated: 2023-03-08T10:28:39Z
department:
- _id: '35'
- _id: '2'
- _id: '307'
doi: 10.1016/j.snb.2014.09.021
language:
- iso: eng
page: 181-185
publication: 'Sensors and Actuators B: Chemical'
publication_identifier:
issn:
- 0925-4005
publication_status: published
quality_controlled: '1'
status: public
title: 'Light-activated resistive ozone sensing at room temperature utilizing nanoporous
In2O3 particles: Influence of particle size'
type: journal_article
user_id: '23547'
year: '2015'
...
---
_id: '25942'
abstract:
- lang: eng
text: Cobalt oxide spinel (Co3O4) with an ordered nanostructure is used as a resistive
gas sensor for carbon monoxide (CO) in low ppm concentrations. The operating temperature
has a strong impact on the concentration-dependent sensing behavior. At lower
temperature (473 K) the sensor response is governed mainly by surface coverage
with CO and/or CO2, whereas at higher temperature (563 K) oxygen diffusion in
the crystal lattice of Co3O4 strongly affects the sensing behavior.
article_type: original
author:
- first_name: S.
full_name: Vetter, S.
last_name: Vetter
- first_name: S.
full_name: Haffer, S.
last_name: Haffer
- first_name: T.
full_name: Wagner, T.
last_name: Wagner
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
citation:
ama: 'Vetter S, Haffer S, Wagner T, Tiemann M. Nanostructured Co3O4 as a CO gas
sensor: Temperature-dependent behavior. Sensors and Actuators B: Chemical.
Published online 2015:133-138. doi:10.1016/j.snb.2014.09.025'
apa: 'Vetter, S., Haffer, S., Wagner, T., & Tiemann, M. (2015). Nanostructured
Co3O4 as a CO gas sensor: Temperature-dependent behavior. Sensors and Actuators
B: Chemical, 133–138. https://doi.org/10.1016/j.snb.2014.09.025'
bibtex: '@article{Vetter_Haffer_Wagner_Tiemann_2015, title={Nanostructured Co3O4
as a CO gas sensor: Temperature-dependent behavior}, DOI={10.1016/j.snb.2014.09.025},
journal={Sensors and Actuators B: Chemical}, author={Vetter, S. and Haffer, S.
and Wagner, T. and Tiemann, Michael}, year={2015}, pages={133–138} }'
chicago: 'Vetter, S., S. Haffer, T. Wagner, and Michael Tiemann. “Nanostructured
Co3O4 as a CO Gas Sensor: Temperature-Dependent Behavior.” Sensors and Actuators
B: Chemical, 2015, 133–38. https://doi.org/10.1016/j.snb.2014.09.025.'
ieee: 'S. Vetter, S. Haffer, T. Wagner, and M. Tiemann, “Nanostructured Co3O4 as
a CO gas sensor: Temperature-dependent behavior,” Sensors and Actuators B:
Chemical, pp. 133–138, 2015, doi: 10.1016/j.snb.2014.09.025.'
mla: 'Vetter, S., et al. “Nanostructured Co3O4 as a CO Gas Sensor: Temperature-Dependent
Behavior.” Sensors and Actuators B: Chemical, 2015, pp. 133–38, doi:10.1016/j.snb.2014.09.025.'
short: 'S. Vetter, S. Haffer, T. Wagner, M. Tiemann, Sensors and Actuators B: Chemical
(2015) 133–138.'
date_created: 2021-10-08T15:50:03Z
date_updated: 2023-03-08T10:29:53Z
department:
- _id: '35'
- _id: '2'
- _id: '307'
doi: 10.1016/j.snb.2014.09.025
language:
- iso: eng
page: 133-138
publication: 'Sensors and Actuators B: Chemical'
publication_identifier:
issn:
- 0925-4005
publication_status: published
quality_controlled: '1'
status: public
title: 'Nanostructured Co3O4 as a CO gas sensor: Temperature-dependent behavior'
type: journal_article
user_id: '23547'
year: '2015'
...
---
_id: '25954'
abstract:
- lang: eng
text: The light-enhanced NO2 sensing behavior of mesoporous In2O3 is measured and
interpreted by means of a new sensing model. The model aims at explaining (i)
the drop in electronic resistance of n-type semiconducting In2O3 under UV light
exposure, (ii) the light-enhanced reaction to oxidizing gases, and (iii) the faster
reaction and regeneration in mesoporous In2O3 as compared to non-porous material.
Contrary to the conventional double Schottky model the dominating factor for the
change in resistance is a change of oxygen vacancy donor states (0.18 eV below
the conduction band) in the bulk phase due to photoreduction, instead of chemisorption.
For the faster reaction and regeneration we propose an explanation based on enhanced
oxygen diffusion in the In2O3 crystal lattice, specifically dominant in the mesoporous
structure. The response of ordered mesoporous In2O3 to NO2 is stronger than in
case of unstructured bulk material (with an average grain size of ca. 40 nm).
The reaction is significantly accelerated by illuminating the samples with UV
light. However, the response of the mesoporous material is weaker in the illuminated
case.
article_type: original
author:
- first_name: Thorsten
full_name: Wagner, Thorsten
last_name: Wagner
- first_name: Claus-Dieter
full_name: Kohl, Claus-Dieter
last_name: Kohl
- first_name: Cesare
full_name: Malagù, Cesare
last_name: Malagù
- first_name: Nicola
full_name: Donato, Nicola
last_name: Donato
- first_name: Mariangela
full_name: Latino, Mariangela
last_name: Latino
- first_name: Giovanni
full_name: Neri, Giovanni
last_name: Neri
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
citation:
ama: 'Wagner T, Kohl C-D, Malagù C, et al. UV light-enhanced NO2 sensing by mesoporous
In2O3: Interpretation of results by a new sensing model. Sensors and Actuators
B: Chemical. Published online 2013:488-494. doi:10.1016/j.snb.2013.02.025'
apa: 'Wagner, T., Kohl, C.-D., Malagù, C., Donato, N., Latino, M., Neri, G., &
Tiemann, M. (2013). UV light-enhanced NO2 sensing by mesoporous In2O3: Interpretation
of results by a new sensing model. Sensors and Actuators B: Chemical, 488–494.
https://doi.org/10.1016/j.snb.2013.02.025'
bibtex: '@article{Wagner_Kohl_Malagù_Donato_Latino_Neri_Tiemann_2013, title={UV
light-enhanced NO2 sensing by mesoporous In2O3: Interpretation of results by a
new sensing model}, DOI={10.1016/j.snb.2013.02.025},
journal={Sensors and Actuators B: Chemical}, author={Wagner, Thorsten and Kohl,
Claus-Dieter and Malagù, Cesare and Donato, Nicola and Latino, Mariangela and
Neri, Giovanni and Tiemann, Michael}, year={2013}, pages={488–494} }'
chicago: 'Wagner, Thorsten, Claus-Dieter Kohl, Cesare Malagù, Nicola Donato, Mariangela
Latino, Giovanni Neri, and Michael Tiemann. “UV Light-Enhanced NO2 Sensing by
Mesoporous In2O3: Interpretation of Results by a New Sensing Model.” Sensors
and Actuators B: Chemical, 2013, 488–94. https://doi.org/10.1016/j.snb.2013.02.025.'
ieee: 'T. Wagner et al., “UV light-enhanced NO2 sensing by mesoporous In2O3:
Interpretation of results by a new sensing model,” Sensors and Actuators B:
Chemical, pp. 488–494, 2013, doi: 10.1016/j.snb.2013.02.025.'
mla: 'Wagner, Thorsten, et al. “UV Light-Enhanced NO2 Sensing by Mesoporous In2O3:
Interpretation of Results by a New Sensing Model.” Sensors and Actuators B:
Chemical, 2013, pp. 488–94, doi:10.1016/j.snb.2013.02.025.'
short: 'T. Wagner, C.-D. Kohl, C. Malagù, N. Donato, M. Latino, G. Neri, M. Tiemann,
Sensors and Actuators B: Chemical (2013) 488–494.'
date_created: 2021-10-09T04:43:40Z
date_updated: 2023-03-08T10:34:05Z
department:
- _id: '35'
- _id: '2'
- _id: '307'
doi: 10.1016/j.snb.2013.02.025
language:
- iso: eng
page: 488-494
publication: 'Sensors and Actuators B: Chemical'
publication_identifier:
issn:
- 0925-4005
publication_status: published
quality_controlled: '1'
status: public
title: 'UV light-enhanced NO2 sensing by mesoporous In2O3: Interpretation of results
by a new sensing model'
type: journal_article
user_id: '23547'
year: '2013'
...
---
_id: '25963'
abstract:
- lang: eng
text: We report the synthesis of mesoporous tin dioxide (SnO2) materials with well-defined
particle morphology. The products consist of uniform spheres with a diameter of
5 μm. The spheres are hierarchically porous with two distinct pore modes of 5.0
nm and 52 nm, respectively. This special porosity is the result of a synthesis
procedure which involves a ‘hard templating’ (nanocasting) process. The product
forms an approximately homogeneous monolayer of spheres on a sensor substrate
and shows promising response to methane gas with low cross-sensitivity to water.
The structural properties and gas-sensing performance are compared with a mesoporous
SnO2 material without defined morphology, prepared by a ‘soft templating’ procedure.
article_type: original
author:
- first_name: J.-H.
full_name: Smått, J.-H.
last_name: Smått
- first_name: M.
full_name: Lindén, M.
last_name: Lindén
- first_name: T.
full_name: Wagner, T.
last_name: Wagner
- first_name: C.-D.
full_name: Kohl, C.-D.
last_name: Kohl
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
citation:
ama: 'Smått J-H, Lindén M, Wagner T, Kohl C-D, Tiemann M. Micrometer-sized nanoporous
tin dioxide spheres for gas sensing. Sensors and Actuators B: Chemical.
Published online 2011:483-488. doi:10.1016/j.snb.2010.12.051'
apa: 'Smått, J.-H., Lindén, M., Wagner, T., Kohl, C.-D., & Tiemann, M. (2011).
Micrometer-sized nanoporous tin dioxide spheres for gas sensing. Sensors and
Actuators B: Chemical, 483–488. https://doi.org/10.1016/j.snb.2010.12.051'
bibtex: '@article{Smått_Lindén_Wagner_Kohl_Tiemann_2011, title={Micrometer-sized
nanoporous tin dioxide spheres for gas sensing}, DOI={10.1016/j.snb.2010.12.051},
journal={Sensors and Actuators B: Chemical}, author={Smått, J.-H. and Lindén,
M. and Wagner, T. and Kohl, C.-D. and Tiemann, Michael}, year={2011}, pages={483–488}
}'
chicago: 'Smått, J.-H., M. Lindén, T. Wagner, C.-D. Kohl, and Michael Tiemann. “Micrometer-Sized
Nanoporous Tin Dioxide Spheres for Gas Sensing.” Sensors and Actuators B: Chemical,
2011, 483–88. https://doi.org/10.1016/j.snb.2010.12.051.'
ieee: 'J.-H. Smått, M. Lindén, T. Wagner, C.-D. Kohl, and M. Tiemann, “Micrometer-sized
nanoporous tin dioxide spheres for gas sensing,” Sensors and Actuators B: Chemical,
pp. 483–488, 2011, doi: 10.1016/j.snb.2010.12.051.'
mla: 'Smått, J. H., et al. “Micrometer-Sized Nanoporous Tin Dioxide Spheres for
Gas Sensing.” Sensors and Actuators B: Chemical, 2011, pp. 483–88, doi:10.1016/j.snb.2010.12.051.'
short: 'J.-H. Smått, M. Lindén, T. Wagner, C.-D. Kohl, M. Tiemann, Sensors and Actuators
B: Chemical (2011) 483–488.'
date_created: 2021-10-09T05:00:31Z
date_updated: 2023-03-09T08:30:50Z
department:
- _id: '35'
- _id: '2'
- _id: '307'
doi: 10.1016/j.snb.2010.12.051
language:
- iso: eng
page: 483-488
publication: 'Sensors and Actuators B: Chemical'
publication_identifier:
issn:
- 0925-4005
publication_status: published
quality_controlled: '1'
status: public
title: Micrometer-sized nanoporous tin dioxide spheres for gas sensing
type: journal_article
user_id: '23547'
year: '2011'
...
---
_id: '25967'
abstract:
- lang: eng
text: We report the structural characterization and gas sensing properties of mesoporous
SnO2 synthesized by structure replication (nanocasting) from ordered mesoporous
KIT-6 silica. The products show a high thermal stability with no structural loss
up to 600 °C and only minor decrease in specific surface area by 18% at 800 °C,
as proven by powder X-ray diffraction (PXRD), transmission electron microscopy
(TEM), and nitrogen physisorption. In particular, the samples turn out to be much
more stable than porous SnO2 materials prepared by sol–gel-based synthesis procedures
for comparison. The thermal stability facilitates the utilization of the materials
as sensors for combustible gases which react at high temperatures; test measurements
reveal promising responses to methane (CH4) as an example.
article_type: original
author:
- first_name: T.
full_name: Waitz, T.
last_name: Waitz
- first_name: B.
full_name: Becker, B.
last_name: Becker
- first_name: T.
full_name: Wagner, T.
last_name: Wagner
- first_name: T.
full_name: Sauerwald, T.
last_name: Sauerwald
- first_name: C.-D.
full_name: Kohl, C.-D.
last_name: Kohl
- first_name: Michael
full_name: Tiemann, Michael
id: '23547'
last_name: Tiemann
orcid: 0000-0003-1711-2722
citation:
ama: 'Waitz T, Becker B, Wagner T, Sauerwald T, Kohl C-D, Tiemann M. Ordered nanoporous
SnO2 gas sensors with high thermal stability. Sensors and Actuators B: Chemical.
Published online 2010:788-793. doi:10.1016/j.snb.2010.08.001'
apa: 'Waitz, T., Becker, B., Wagner, T., Sauerwald, T., Kohl, C.-D., & Tiemann,
M. (2010). Ordered nanoporous SnO2 gas sensors with high thermal stability. Sensors
and Actuators B: Chemical, 788–793. https://doi.org/10.1016/j.snb.2010.08.001'
bibtex: '@article{Waitz_Becker_Wagner_Sauerwald_Kohl_Tiemann_2010, title={Ordered
nanoporous SnO2 gas sensors with high thermal stability}, DOI={10.1016/j.snb.2010.08.001},
journal={Sensors and Actuators B: Chemical}, author={Waitz, T. and Becker, B.
and Wagner, T. and Sauerwald, T. and Kohl, C.-D. and Tiemann, Michael}, year={2010},
pages={788–793} }'
chicago: 'Waitz, T., B. Becker, T. Wagner, T. Sauerwald, C.-D. Kohl, and Michael
Tiemann. “Ordered Nanoporous SnO2 Gas Sensors with High Thermal Stability.” Sensors
and Actuators B: Chemical, 2010, 788–93. https://doi.org/10.1016/j.snb.2010.08.001.'
ieee: 'T. Waitz, B. Becker, T. Wagner, T. Sauerwald, C.-D. Kohl, and M. Tiemann,
“Ordered nanoporous SnO2 gas sensors with high thermal stability,” Sensors
and Actuators B: Chemical, pp. 788–793, 2010, doi: 10.1016/j.snb.2010.08.001.'
mla: 'Waitz, T., et al. “Ordered Nanoporous SnO2 Gas Sensors with High Thermal Stability.”
Sensors and Actuators B: Chemical, 2010, pp. 788–93, doi:10.1016/j.snb.2010.08.001.'
short: 'T. Waitz, B. Becker, T. Wagner, T. Sauerwald, C.-D. Kohl, M. Tiemann, Sensors
and Actuators B: Chemical (2010) 788–793.'
date_created: 2021-10-09T05:04:40Z
date_updated: 2023-03-09T08:35:09Z
department:
- _id: '35'
- _id: '2'
- _id: '307'
doi: 10.1016/j.snb.2010.08.001
language:
- iso: eng
page: 788-793
publication: 'Sensors and Actuators B: Chemical'
publication_identifier:
issn:
- 0925-4005
publication_status: published
quality_controlled: '1'
status: public
title: Ordered nanoporous SnO2 gas sensors with high thermal stability
type: journal_article
user_id: '23547'
year: '2010'
...