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

Author(s)

Zito, Cecilia A. ^{[1, 2]} ; Perfecto, Tarcisio M. ^[2] ; Dippel, Ann-Christin ^[3] ; Volanti, Diogo P. ^[2] ; Koziej, Dorota ^[1]

Affiliation

^[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

• Document type: Journal article
• Source: ACS APPLIED MATERIALS & INTERFACES; v. 12, n. 15, p. 17757-17763, APR 15 2020.
• Web of Science Citations: 6

Abstract

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: 17/01267-1 - Graphene acid-hollow metal oxides composites for gas sensor
• Grantee: Diogo Paschoalini Volanti
• Support Opportunities: Regular Research 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 Opportunities: Scholarships in Brazil - Doctorate
• 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 Opportunities: Research Projects - Thematic Grants
• 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 Opportunities: Scholarships abroad - Research Internship - 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 Opportunities: Scholarships in Brazil - Doctorate