Developing a polarization insensitive, omnidirectional, and ultra-wideband (UWB) antenna is highl... more Developing a polarization insensitive, omnidirectional, and ultra-wideband (UWB) antenna is highly desired for improving the utilization of freely available electromagnetic (EM) radiation energy. In this study, we have designed an UWB antenna based on tapered flower petals and numerically analyzed to show that it is a promising candidate for energy harvesting applications in the infrared (IR) to UV–visible regime. The impacts of design strategy and parameters on the absorption performance are studied numerically. The antenna shows a high performance in both bandwidth and absorptivity (average absorption of 84.5% spanning a broad range from 25 to 800 THz) under normal incidence of plane waves. To get a better understanding behind such high and UWB absorption mechanism, we investigated the electric field (E-field) distribution over the structure. The antenna also generates less than 5% absorption deviation between normal to 45° incident angle and 0.05% absorption deviation between 0° ...
In this paper, we developed a high-performance solid-state pH sensor using a Ce0.9Sr0.1(Zr0.53Ti0... more In this paper, we developed a high-performance solid-state pH sensor using a Ce0.9Sr0.1(Zr0.53Ti0.47)O4 (CSZT) membrane through a very simple sol–gel spin-coating process. The structural properties of the CSZT membrane are correlated with its sensing characteristics. The CSZT based EIS sensor exhibited a high pH sensitivity of 92.48 mV pH , which is beyond the Nernst limit (59.4 mV pH ), and good reliability in terms of a low hysteresis voltage of 1 mV and a small drift rate of 0.15 mV h . This behaviour is attributed to the incorporation of Sr in the CSZT sensing membrane, which promotes change in the Ce oxidation state from Ce to Ce.
This work presents a comparison between the La<sub>2</sub>O<sub>3</sub> a... more This work presents a comparison between the La<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> sensing membranes for solution-based capacitive electrolyte-insulator-semiconductor (EIS) pH sensors. The La<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> sensing membranes were fabricated through a simple spin-coating method. The structural characteristics of these sensing membranes were examined by using X-ray photoelectron spectroscopy and X-ray diffraction. The La<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> EIS sensor made using the spin-coating process demonstrated a higher sensitivity of 70.60 mV/pH, a smaller drift rate of 0.14 mV/h and a lower hysteresis voltage of 1 mV, as compared to the La<sub>2</sub>O<sub>3</sub> EIS sensor.
Developing a polarization insensitive, omnidirectional, and ultra-wideband (UWB) antenna is highl... more Developing a polarization insensitive, omnidirectional, and ultra-wideband (UWB) antenna is highly desired for improving the utilization of freely available electromagnetic (EM) radiation energy. In this study, we have designed an UWB antenna based on tapered flower petals and numerically analyzed to show that it is a promising candidate for energy harvesting applications in the infrared (IR) to UV–visible regime. The impacts of design strategy and parameters on the absorption performance are studied numerically. The antenna shows a high performance in both bandwidth and absorptivity (average absorption of 84.5% spanning a broad range from 25 to 800 THz) under normal incidence of plane waves. To get a better understanding behind such high and UWB absorption mechanism, we investigated the electric field (E-field) distribution over the structure. The antenna also generates less than 5% absorption deviation between normal to 45° incident angle and 0.05% absorption deviation between 0° ...
In this paper, we developed a high-performance solid-state pH sensor using a Ce0.9Sr0.1(Zr0.53Ti0... more In this paper, we developed a high-performance solid-state pH sensor using a Ce0.9Sr0.1(Zr0.53Ti0.47)O4 (CSZT) membrane through a very simple sol–gel spin-coating process. The structural properties of the CSZT membrane are correlated with its sensing characteristics. The CSZT based EIS sensor exhibited a high pH sensitivity of 92.48 mV pH , which is beyond the Nernst limit (59.4 mV pH ), and good reliability in terms of a low hysteresis voltage of 1 mV and a small drift rate of 0.15 mV h . This behaviour is attributed to the incorporation of Sr in the CSZT sensing membrane, which promotes change in the Ce oxidation state from Ce to Ce.
This work presents a comparison between the La<sub>2</sub>O<sub>3</sub> a... more This work presents a comparison between the La<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> sensing membranes for solution-based capacitive electrolyte-insulator-semiconductor (EIS) pH sensors. The La<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> sensing membranes were fabricated through a simple spin-coating method. The structural characteristics of these sensing membranes were examined by using X-ray photoelectron spectroscopy and X-ray diffraction. The La<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> EIS sensor made using the spin-coating process demonstrated a higher sensitivity of 70.60 mV/pH, a smaller drift rate of 0.14 mV/h and a lower hysteresis voltage of 1 mV, as compared to the La<sub>2</sub>O<sub>3</sub> EIS sensor.
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