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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Low-Temperature Carbon Dioxide Gas Sensor Based on Yolk-Shell Ceria Nanospheres

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Zito, Cecilia A. [1, 2] ; Perfecto, Tarcisio M. [2] ; Dippel, Ann-Christin [3] ; Volanti, Diogo P. [2] ; Koziej, Dorota [1]
Total Authors: 5
[1] Univ Hamburg, CHyN, Inst Nanostruct & Solid State Phys, D-22607 Hamburg - Germany
[2] Sao Paulo State Univ UNESP, Lab Mat Sustainabil LabMatSus, BR-15054000 Sao Jose Do Rio Preto - Brazil
[3] DESY, Deutsch Elektronen Synchrotron, D-22607 Hamburg - Germany
Total Affiliations: 3
Document type: Journal article
Source: ACS APPLIED MATERIALS & INTERFACES; v. 12, n. 15, p. 17757-17763, APR 15 2020.
Web of Science Citations: 0

Monitoring carbon dioxide (CO2) levels is extremely important in a wide range of applications. Although metal oxide-based chemoresistive sensors have emerged as a promising approach for CO2 detection, the development of efficient CO2 sensors at low temperature remains a challenge. Herein, we report a low-temperature hollow nanostructured CeO2-based sensor for CO2 detection. We monitor the changes in the electrical resistance after CO2 pulses in a relative humidity of 70% and show the high performance of the sensor at 100 degrees C. The yolk-shell nanospheres have not only 2 times higher sensitivity but also significantly increased stability and reversibility, faster response times, and greater CO2 adsorption capacity than commercial ceria nanoparticles. The improvements in the CO2 sensing performance are attributed to hollow and porous structure of the yolk-shell nanoparticles, allowing for enhanced gas diffusion and high specific surface area. We present an easy strategy to enhance the electrical and sensing properties of metal oxides at a low operating temperature that is desirable for practical applications of CO2 sensors. (AU)

FAPESP's process: 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products
Grantee:José Maria Correa Bueno
Support type: Research Projects - Thematic Grants
FAPESP's process: 18/00033-0 - Sensing devices of volatile organic compounds based on ZnO hollow/p-type semiconductors heterostructures
Grantee:Tarcísio Micheli Perfecto
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 16/25267-8 - Graphene acid composites with hollow CeO2 and Pd-CeO2 yolk-shell structures applied as volatile organic compounds sensors
Grantee:Cecilia de Almeida Zito
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 18/08271-7 - Structural, electronic, and chemical characterization of graphene acid composites with yolk-shell CeO2 and yolk-shell Pd-CeO2 nanospheres
Grantee:Cecilia de Almeida Zito
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 17/01267-1 - Graphene acid-hollow metal oxides composites for gas sensor
Grantee:Diogo Paschoalini Volanti
Support type: Regular Research Grants