Abstract:
Phononic crystal sensor is a novel technology for sensing applications with high performance. The present work proposes theoretically a design of gas (CO2 ) sensor based on a one-dimensional (1D) porous silicon (PSi) phononic crystal (PnC) sandwiched between two thin rubber layers. The transfer matrix method (TMM) was used for the numerical modeling of the acoustic waves spectra through the 1DPSi-PnC sensor structure. The results showed that a resonant mode was created inside the transmission spectrum as a result of the presence of the two-sided rubber layers. Also, the position of the resonant mode was invariant with changing CO2 concentration, temperature, and pressure. On the contrary, the intensity of the transmitted mode is very sensitive to any change in these parameters. With increasing the CO2 concentration (from 0% to 90%) and pressure (from 2 atm to 6 atm), the intensity of the resonant mode are significantly increased. While, with increasing temperature (from 20 0C to 200 0C), the intensity of the resonant mode is decreased. These results are correlated directly to the density of the CO2/ air mixture. Therefore, the proposed 1DPSi-PnC sensor can measure CO2 pollutions in the surrounding air over a wide range of concentration, temperature, and pressure values.
The merits of a gas sensor based on porous materials and PnC structure are numerous. For example, the ease of fabrication, working under tough conditions, and its capability to sense CO2 pollutions from the surrounding air directly. Also, the proposed sensor can be developed as a monitor for many gases in industrial and biomedical applications. Moreover, porous materials enable the proposed design to be compatible with other fluidic components specifically liquids. Thereby, allowing the proposed gas sensor to be replicated for various fluidic sensing applications.
Biography:
Dr. Ahmed Mohamed Mehaney is a lecturer of physics at the Department of physics, faculty of Science at Beni-Suef University. He received a BS degree from Beni-Suef University (2008) and MS degrees from Beni-Suef University (2013). In 2017, he received a PhD degree from Beni-Suef University. (h-index : 19), Citations (888).
Dr. Mehaney’s research focuses on the dynamics of materials and structures, especially phononic crystals and locally resonant phononic Metamaterials, at both the continuum and atomistic scales. His approach to phononics is rather broad ranging from vibrations isolation structures in lattice dynamics, sensors, energy harvesting structures as well as photonic crystals and Metamaterials. His studies are concerned with physical phenomena governing these systems, relevant theoretical and computational treatments, and analysis of the effects of dispersion, resonance, dissipation and nonlinearity. Recently he has also been conducting experiments to support portions of the theoretical work. In 2013 he received the best Master thesis Award form Beni-Suef University. Dr. Mehaney has served as an editor and referee for many journals such as the American Journal of Mechanical and Materials Engineering, Annals of Biostatistics & Biometric Applications, International Journal of Physics Research and Applications, Beni-Suef university journal of basic and applied sciences and the Journal of Computational Systems Biology (JCSB). He is as an author of a chapter entitle Phononic crystals and thermal effects in a book entitled Photonic Crystals-A Glimpse of the Current Research Trends at IntechOpen. During his PhD he published five papers, and since 2012 so far he published 66 papers in archival journals such as Journal of Applied Physics, Scientific Reports, Ultrasonics, physica E and ACS Applied Materials & Interfaces. Dr. Mehaney has served as an editor for the Annals of Biostatistics & Biometric Applications, International Journal of Physics Research and Applications, Beni-Suef university journal of basic and applied sciences and a referee for many high quality impacted journals such as Nanotechnology, ACS Materials& Interfaces, Journal of applied physics, Ultrasonics, Journal of physics D-applied physics, Scientific reports.
