Research Overview:
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Low-cost synthesis of vertical ZnO nanorods by seedless hydrothermal method:
In this study, a simple two precursor-based seedless hydrothermal method is optimized to achieve vertical growth of ZnO nanorods. Experimental results show the most important factors responsible for vertical growth are temperature, concentration, initial waiting time, and substrate morphology.
A low-cost and high performance multifunction sensor is developed by integrating the organic semiconductor with vertically aligned ZnO micro rods. The proposed device is able to produce both piezoelectric response and angle-dependent voltage flipping response. The photovoltage polarity flipping is happened due the number of active Au nanoparticles, which reverses the flow of the charge carriers. This proposed multifunction sensor can be very useful for artificial skin in robotics.
Light illumination angle-dependent photovoltage polarity flipping in hybrid piezo-optoelectronic sensor
Hybrid integration of n-type ZnO nanorod semiconductor with p-type optically active organic polymer has been developed for low-cost and large-area piezoelectric and optoelectronic applications.
Simulation investigation of suitable geometry of ZnO NRs for the development of high-performance tactile sensors and energy harvesting devices:
The simulation results show that out of many geometries and inclinations of ZnO nanorods, the highest piezoelectric output is demonstrated by the inclined ZnO nanorods due to the application of higher torque force or shear stress in similar applied force.
Nanofabrication of wearable piezo sensors & energy harvesting system
The optimized parameters for the growth of vertically aligned ZnO nanorods are used to fabricate piezoelectric-based applications such as tactile/haptic sensors, nanogenerators, and energy harvesting devices.
A key parameter for the highest piezoelectric voltage-producing material: Effect of ratio d33⁄ϵr
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