Title of article :
Fabrication and characterization of PSi/nanometal hybrid structures by laser for CO gas sensor
Author/Authors :
Badr Dheyab, Amer Ministry of Science and Technology, Baghdad, Iraq , Idan Mohammed, Safaa Ministry of Science and Technology, Baghdad, Iraq , Kamal Mustafa, Marwa Ministry of Science and Technology, Baghdad, Iraq , Saad Fayadh, Rasha Ministry of Science and Technology, Baghdad, Iraq , Luay Hussein, Noor Ministry of Science and Technology, Baghdad, Iraq
Pages :
6
From page :
107
To page :
112
Abstract :
AbstractMesoporous silicon (mesoPSi) layers fabricated by the photoelectrochemical etching (PECE) method in hydrofluoric acid (HF) are active as carbon monoxide gas sensors. The modified porous silicon (PSi) can be used with noble metals to manufacture an effective gas sensor. Embedded gold, platinum, and palladium nanoparticles Au, Pt, and Pd-NPs could modify the surface morphology of mesoPSi and form mesoPSi/AuPtPd-NPs hybrid structures through a simple and dipping process in fixed salt concentrations. The morphology of the hybrid structures has been studied using scanning electron microscopy and X-ray diffraction. The prepared gas sensor has measured the electrical characteristics at room temperature. Shape, nanoparticle size, and specific surface area strongly influenced the current–voltage characteristics. The results show that Au, Pd, and Pt-NPs sizes prepared by the dipping process for mesopore-like structures were in the range from 0.64 to 7.53 nm. Besides, considerable improvements in the response, recovery times and sensitivity of gas sensor were noticed when decreasing the incorporated Au, Pd, and Pt-NPs to the mesoPSi matrix.
Keywords :
MesoPSi , SEM , Gas sensing , Photoelectrochemical , AuPtPd-NPs hybrid structures
Journal title :
Journal of Theoretical and Applied Physics
Serial Year :
2020
Record number :
2688293
Link To Document :
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