研究目的
Investigating the influence of embedding Au, Pd monometallic and Au-Pd bimetallic nanoparticles on porous silicon-based gas sensor for CO gas detection.
研究成果
The modified bimetallic alloy nanoparticles Au?Pd NPs/P-si porous silicon gas sensors demonstrated high sensitivity and faster temporal response for CO gas detection compared to bare P-si and monometallic nanoparticles sensors, attributed to the high specific surface area of bimetallic nanoparticles.
研究不足
The study focuses on low pressure CO gas detection (0.2 and 0.5 mbar) and the performance at higher pressures or other gases is not explored. The modification process and sensor performance could be further optimized.
1：Experimental Design and Method Selection:
Porous silicon layer P-si was prepared by photo electrochemical etching (PECE) with specific laser wavelength and power density. AuNPs/P-si, PdNPs/P-si and Au-PdNPs/P-si hetrostructures were prepared by ion reduction process.
2：Sample Selection and Data Sources:
Fresh P-si was dipped in salt solutions containing HAuCl4, PdCl2 and their mixture.
3：List of Experimental Equipment and Materials:
SEM, FTIR, XRD, and EDS were used for investigation.
4：Experimental Procedures and Operational Workflow:
Dipping times were controlled for different nanoparticles deposition.
5：Data Analysis Methods:
Particle size and specific surface area were calculated using Scherrer's equation and specific surface area formula.
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