研究目的
Investigating the enhanced sensitivity of cerium oxide-tungsten oxide core-shell nanowires to acetone for early disease diagnosis applications.
研究成果
The study demonstrated the formation of cerium oxide-tungsten oxide core-shell nanowires with improved response and sensitivity to acetone, attributed to the formation of heterojunctions at the interface of both oxides. The sensors showed potential for early disease diagnosis applications, with enhanced selectivity and sensitivity to acetone.
研究不足
The sensors showed a drop in response in humid ambient due to the lowering of baseline resistance. The study suggests the need for further optimization to attenuate humidity interference.
1：Experimental Design and Method Selection:
Aerosol assisted chemical vapor deposition (AACVD) was used to synthesize cerium oxide-tungsten oxide core-shell nanowires directly on silicon-based micromachined platforms.
2：Sample Selection and Data Sources:
Non-modified tungsten oxide nanowires, cerium oxide porous films, and cerium oxide-tungsten oxide core-shell nanowires were synthesized and tested.
3：List of Experimental Equipment and Materials:
SEM (Auriga Series, Carl Zeiss), XRD (Bruker-AXS), XPS (Kratos Axis Supra), diffuse reflectance (AvaSpec-UV/VIS/NIR, Avantes), and gas sensing test chamber with mass flow controllers.
4：Experimental Procedures and Operational Workflow:
Two-step AACVD process for core-shell nanowires, followed by annealing and gas sensing tests at various temperatures and humidity levels.
5：Data Analysis Methods:
Sensor response defined as Ra/Rg, ANOVA, and principal component analysis for analyte discrimination.
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SEM
Auriga Series
Carl Zeiss
Morphology examination of the films
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XRD
A25 D8 Discover
Bruker-AXS
Phase examination of the films
