Fe doped tin oxide was prepared by hydrothermal method and the same has been used to fabricate a thin film for sensing. Fe doped tin oxide was prepared by sol-gel dip-coating technique on the glass substrates for hydrogen sensing. The microstructure and morphology of the prepared materials were analysed by XRD and SEM analysis. The SEM images clearly show that doping can clamp down the growth of the large crystallites and can lead to large agglomeration spheres. Thin film gas sensors were formed from undoped pure SnO2 and Fe doped SnO2. The sensors were exposed to ammonia and ethanol gases. The responses of the sensors to 1000 ppm of hydrogen gas at different operating temperatures (25 °C -100 °C) were studied. Results show that a good sensitivity towards hydrogen gas was obtained with Fe doped SnO2 thin film sensor at an optimal operating temperature of 75 °C. Response time of the sensor and its stability were also studied.
In Ayurveda many times Aushadhi Dravya’s our combined with Aahariya Dravya’s in different conditions where the patient is not able to consume the medicine due to their Virya Pradhanta, Bala Kshya or Ag-nimandhya “Yavagu Kalpna” is one of the Ahariya Kalpna which when siddha with Aushadhi Dravya’s can be used in different conditions for eradication of the disease. Yavagu not only cure’s the disease but also helps in the prevention of a disease by its different properties and nutritive value. So, in this review “Yavagu Kalpana” is critically analysed & compiled from Ayurveda text for their clinical application in future.
Keywords: Yavagu, Aushadhi Dravya, Aahariya Dravya
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