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Enhanced Morphological Properties of Macroporous Silicon with the Incorporation of Au-Ag Bimetallic Nanoparticles for Improved CO2 Gas Sensing

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Abstract

In this work, the effects of incorporating bare macroporous silicon (macro-Psi) layer with bimetallic nanoparticles Au-Ag on the performance Psi CO2 gas sensor synthesized by a laser-assisted etching (LAE) process were investigated. Well-controlled and simple immersion process of bare macro-Psi layer in the 10−3 M of silver nitrate (AgNO3) and chloroauric acid (HAuCl4) individually and in the mixing solution with ratio 1:1 was employed to synthesize monometallic AuNPs/macro-Psi, AgNPs/macro-Psi, and bimetallic Au-AgNPs/macro-Psi hybrid structures of CO2 gas sensors. Morphological properties of bare macro-Psi layer, monometallic, and bimetallic hybrid structures were investigated using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and energy-dispersive X-ray analysis (EDS). Electrical characteristics (I–V)of the sensor were measured primary in a vacuum case and with CO2 at 0.2, 0.5, 1, and 1.5 mbar gas pressures. The result showed a significant enhancement in sensitivity and temporal response of the bimetallic hybrid structures compared with that of monometallic and bare macro-Psi layer and an enhanced performance of the sensors due to the high value of integrated specific surface area of the bimetallic nanoparticles and the resulting Schottky barrier height.

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Acknowledgments

The author would like to express thanks to the Department of Applied Sciences, Nanotechnology and Advanced Materials Research Center, University of Technology, and Razi Metallurgical Research Center, Iran for their facility and help to use the SEM (MIRA3 TESCAN) device and conducting the EDS analyses.

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Authors and Affiliations

  1. Department of Applied Science, University of Technology, Baghdad, Iraq

    Alwan M. Alwan, Muslim F. Jawad & Duaa A. Hashim

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  1. Alwan M. Alwan
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  2. Muslim F. Jawad
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  3. Duaa A. Hashim
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Correspondence to Alwan M. Alwan.

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Alwan, A.M., Jawad, M.F. & Hashim, D.A. Enhanced Morphological Properties of Macroporous Silicon with the Incorporation of Au-Ag Bimetallic Nanoparticles for Improved CO2 Gas Sensing. Plasmonics 14, 1565–1575 (2019). https://doi.org/10.1007/s11468-019-00935-8

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  • DOI: https://doi.org/10.1007/s11468-019-00935-8

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