Sharma, P and Singh, R and Sharma, R and Mukhiya, R and Awasthi, K and Kumar, M
(2019)
Nanostructured Bismuth Oxide EGFET based PH Sensors for Water Purification.
In: Indo-German Bilateral Workshop on Membranes for Water and Energy (IGWMWE-2019), February 18-20, 2019, CSIR-CSMCR, Bhavnagar, India.
Abstract
The WHO recommended pH value for drinking water lies between 6.5 to 8.5. Due to increasing water pollution day by day, real time monitoring of water become an important aspect for the researchers. EGFET based sensors provide an advantages like easy fabrication, disposable gate, small influence of operating temperature etc. Approach towards fabricating nano structured material based EGFET sensors taken into account. In present work nano-structured bismuth film has been deposited on the platinum/titanium deposited silicon substrate by the e-beam evaporation method and further heat treatment was given. Nanostructured Bi2O3 has been characterized by FESEM for observation of morphology. XPS studies have been done in order to observe composition on the surface of the film. Dominant peaks at 163.6 eV and 158.3 eV are corresponding to the Bi2O3, bonding. The structure and the crystallinity of the film were confirmed by the XRD. Further pH sensing in water was further investigated through the prepared films at different pH i.e. 6. 7, 8, 10 and 12. The film showed a good pH sensing behaviour with a sensitivity of 50.55mV/pH. The present results proves the Bi2O3 films potential candidate for pH sensing in acidic as well as basic medium on EGFET based pH sensor platform.
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