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The demand for materials based on nanotechnology has been identified as an essential component in a variety of applications. Among other applications, nano-based sensing devices have received considerable attention, especially in medical and environmental monitoring. Recent developments have enabled the fabrication and application of sensing devices. My research talk will consist of the basic concepts of the fabrication of different modified electrode based sensor. Similarly, the fabrication of bacteria sensor associated with urinary tract infections, herbicide atrazine, and electrochemical determination of cancer biomarker sensors will also be presented, highlighting its advantages over other conventional sensors, as reported by my recent publication. Flexible consumer electronic products, such as folding displays, health monitoring devices, smart fabrics, and flexible body sensors, have gotten a lot of attention since they can be utilised for flexible and wearable electronic gadgets. Lightweight, flexible, and large storage capacity are all requirements for an energy storage system to power these functional devices. Flexible supercapacitors, with their high power densities, extended life, and quick charge/discharge rates, have been highlighted as a possible solution for such needs. I am currently working on the development of high energy density conducting polymer based supercapacitor for energy storage applications. Energy conversion (EC) devices that are environmentally friendly and efficient are critical for the production of sustainable energy. Direct methanol fuel cells (DMFCs) are potential EC devices for supplying power to portable electronic devices and electric vehicles, with the slow methanol electrooxidation reaction (MEOR) kinetics at the anode being the main constraint. Platinum (Pt) is typically the most advantageous choice for electrocatalysis in the MEOR due to its distinct d-band configuration, which allows for rapid methanol adsorption and dissociation. However, the high cost and proclivity to poison render widespread commercial Platinum (Pt)-based electrocatalysis in DMFCs unviable. My attempt is to rationally integrate Copper, Nickel and Cobalt based materials in order to create a novel composite that could be used effectively in DMFCs. Hydrogen has been recognised as a future fuel that could help solve the energy crisis caused by fossil-fuel exhaustion. The most abundant element in the universe is hydrogen. Hydrogen has a higher combustion enthalpy and produces zero-pollution. Hydrogen (H2) fuel cells have a lot of potential in transportation and stationary applications, but their widespread commercialization is hampered by their expensive cost. Because platinum (Pt) is one of the most expensive components of a fuel cell, numerous R&D efforts have focused on ways to improve the activity, as well as platinum free catalysts for long-term applications. My research project also focuses on two ways to addressing catalyst challenges: low-Pt catalysts and Pt-free catalysts.