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Junction-Amplified Porous SnO2-Co3O4 Nanospheres for ppb-Level Low-Temperature Acetone Detection and
Jian Hou1,2, Dalei Zu1,2, Zhaoyang Li3
1School of Intelligent Manufacturing, Luoyang Institute of Science and Technology, Luoyang471023, China.
ACS Sensors
|July 3, 2026
Summary
We developed porous tin oxide-cobalt oxide nanospheres for breath acetone sensing, achieving ppb-level detection at 125°C. This breakthrough enhances signal gain and reduces transport loss for effective low-temperature operation.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Porous oxide heterostructures show promise for breath acetone sensing.
- Low-temperature operation is hindered by low signal gain and interfacial transport losses in humid conditions.
Purpose of the Study:
- To develop highly sensitive and stable porous oxide heterostructures for breath acetone sensing at low temperatures.
- To investigate the relationship between material structure, electronic properties, and sensing performance.
Main Methods:
- Synthesis of porous SnO2-Co3O4 nanospheres using a glucose-templated route with controlled Sn:Co ratios.
- Characterization using UV-vis spectroscopy, Mott-Schottky analysis, XPS, and electrochemical impedance spectroscopy.
- Fabrication and testing of chemiresistive sensors for acetone detection.
Main Results:
- Optimized SnO2-Co3O4 nanospheres (SnCo-3) achieved ppb-level acetone detection at 125°C (43 ppb limit of detection).
- The material exhibited an enhanced p-n junction network, improving band-bending tunability and charge transport.
- Reduced interfacial transport loss and amplified resistance modulation were observed due to optimized junction barriers.
Conclusions:
- A mechanism-guided strategy was developed for designing efficient low-temperature chemiresistive breath sensors.
- Optimizing junction gain and interfacial transport is crucial for enhanced sensing performance.
- The developed sensor demonstrates potential for wearable breath analysis applications.
