A novel PNM textile with extremely small thickness on the order of a few micron was characterized... more A novel PNM textile with extremely small thickness on the order of a few micron was characterized at millimeter wave frequencies (26.5 - 40 GHz), and the impedance analysis of the material was presented. The results show that the PNM is an excellent absorber for wideband applications; the highly polarized materials can be utilized for polarization detection and sensing applications. The impedance results of the PNM textile show that CNTs can function as resonators at microwave frequencies due to the long nanotubes, hence, paving ways for further theoretical and experimental studies on these behaviors. In future research efforts, the PNM will be characterized in gas to establish a foundation for wireless gas sensor designs in the microwave frequency range.
A sensor structure based on surface plasmon resonance (SPR) and carbon nanotubes (CNTs) is design... more A sensor structure based on surface plasmon resonance (SPR) and carbon nanotubes (CNTs) is designed and developed. The device is an ultrasensitive wireless sensor operating in microwave frequencies utilizing the gas sensitivity of CNT mixtures. The sensor consists of a corrugated aluminum plate whose surface is periodically covered with a thin layer of the CNT materials. The incident TM-polarized waves on this surface excite the surface plasmon (SP) mode, thus resulting in a drop of power of the reflected wave. The simulations of the SPR-CNT-based wireless sensor show a frequency shift of 400 MHz in operation range around 22.5 GHz.
A novel polarized nano-material (PNM) textile is fabricated and characterized at Ka-band (26.5 to... more A novel polarized nano-material (PNM) textile is fabricated and characterized at Ka-band (26.5 to 40 GHz) by rectangular waveguide measurements for three different polarization schemes (crossed, horizontal, and vertical polarized samples). Since carbon nanotubes were found to be ultra sensitive to different gases at extremely low concentration, a very important application is integrated gas sensors that are based on the change in the electrical properties of carbon nanotube materials induced by gas molecule adsorption. However, a systematic design methodology for high frequency gas sensors utilizing carbon nanotube materials is not yet possible due to the lack of in-depth knowledge on the material properties before and after being exposed to the gases of interests. In this study, the scattering parameters of PNM textile embedded in waveguides are measured in both room atmosphere and in ammonia/air mixture of 5% ammonia. The gas measurement show a phase shift of 10 degrees in S11 values. The impedance of the PNMs are computed from the scattering parameters in waveguide measurements, which for the first time experimentally show that CNTs can function as resonators at microwave frequencies.
A novel PNM textile with extremely small thickness on the order of a few micron was characterized... more A novel PNM textile with extremely small thickness on the order of a few micron was characterized at millimeter wave frequencies (26.5 - 40 GHz), and the impedance analysis of the material was presented. The results show that the PNM is an excellent absorber for wideband applications; the highly polarized materials can be utilized for polarization detection and sensing applications. The impedance results of the PNM textile show that CNTs can function as resonators at microwave frequencies due to the long nanotubes, hence, paving ways for further theoretical and experimental studies on these behaviors. In future research efforts, the PNM will be characterized in gas to establish a foundation for wireless gas sensor designs in the microwave frequency range.
A sensor structure based on surface plasmon resonance (SPR) and carbon nanotubes (CNTs) is design... more A sensor structure based on surface plasmon resonance (SPR) and carbon nanotubes (CNTs) is designed and developed. The device is an ultrasensitive wireless sensor operating in microwave frequencies utilizing the gas sensitivity of CNT mixtures. The sensor consists of a corrugated aluminum plate whose surface is periodically covered with a thin layer of the CNT materials. The incident TM-polarized waves on this surface excite the surface plasmon (SP) mode, thus resulting in a drop of power of the reflected wave. The simulations of the SPR-CNT-based wireless sensor show a frequency shift of 400 MHz in operation range around 22.5 GHz.
A novel polarized nano-material (PNM) textile is fabricated and characterized at Ka-band (26.5 to... more A novel polarized nano-material (PNM) textile is fabricated and characterized at Ka-band (26.5 to 40 GHz) by rectangular waveguide measurements for three different polarization schemes (crossed, horizontal, and vertical polarized samples). Since carbon nanotubes were found to be ultra sensitive to different gases at extremely low concentration, a very important application is integrated gas sensors that are based on the change in the electrical properties of carbon nanotube materials induced by gas molecule adsorption. However, a systematic design methodology for high frequency gas sensors utilizing carbon nanotube materials is not yet possible due to the lack of in-depth knowledge on the material properties before and after being exposed to the gases of interests. In this study, the scattering parameters of PNM textile embedded in waveguides are measured in both room atmosphere and in ammonia/air mixture of 5% ammonia. The gas measurement show a phase shift of 10 degrees in S11 values. The impedance of the PNMs are computed from the scattering parameters in waveguide measurements, which for the first time experimentally show that CNTs can function as resonators at microwave frequencies.
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