Papers by Biswajit Mahanty
Materials Advances, 2021
An all-fiber pyro- and piezo-electric nanogenerator for IoT based self-powered health-care monito... more An all-fiber pyro- and piezo-electric nanogenerator for IoT based self-powered health-care monitoring has been presented.
Materials Today: Proceedings, 2020
In this work we have streamlined our efforts towards obtaining a solution for human health monito... more In this work we have streamlined our efforts towards obtaining a solution for human health monitoring system that can be used at home as well as hospital for medical issues. First, we have fabricated PVDF/MWCNT composite electrospun nanofibers followed by piezoelectric pressure sensor directly as self-powered electronic skin (e-skin). The surface morphology is studied by FE-SEM and vibrational modes are characterized by FT-IR. Due to incorporation of conducting MWCNT into the PVDF matrix the flexible self-powered e-skin shows tremendous sensitivity towards human motions and subsequently it can be used for human physiological signal monitoring purpose via non-invasive way that eliminates human errors.
ACS Sustainable Chemistry & Engineering, 2019
Perhaps the most abundant form of waste energy in our surrounding is the parasitic magnetic noise... more Perhaps the most abundant form of waste energy in our surrounding is the parasitic magnetic noise arising from electrical power transmission system. In this work, a flexible and rollable magneto-mechano-electric nanogenerator (MMENG) based wireless IoT sensor has been demonstrated in order to capture and utilize the magnetic noise. Free standing magnetoelectric composites are fabricated by combining magnetostrictive nickel ferrite (NiFe 2 O 4) nanoparticles and piezoelectric polyvinylidene-co-trifluoroethylene (P(VDF-TrFE)) polymer. The magnetoelctric 0-3 type nanocomposites possess maximum magnetoelectric voltage coefficient (α) of 11.43 mV/cm-Oe. Even, without magnetic bias field 99 % of the maximum value is observed due to self-bias effect. As a result, the MMENG generates peak-to-peak open circuit voltage of 1.4 V, output power density of 0.05 µW/cm 3 and successfully operates commercial capacitor under the weak (⁓ 1.7× 10-3 T) and low frequency (⁓ 50 Hz) stray magnetic field arising from the power cable of home appliances such as, electric kettle. Finally, the harvested electrical signal has been wirelessly transmitted to a smart phone in order to demonstrate the possibility of position monitoring system construction. This cost effective and easy to integrate approach with tailored size and shape of device configuration is expected to be explored in nextgeneration self-powered IoT sensors including implantable biomedical devices and human health monitoring sensory systems.
Advanced Science Letters, 2016
Energy Technology, 2016
With the widespread use of wearable electronics, portable and flexible energy harvesting devices ... more With the widespread use of wearable electronics, portable and flexible energy harvesting devices with a high sensitivity have attracted considerable interest. Herein, an ultrasensitive piezoelectric nanogenerator (PNG) made of a few layers of 2 D‐MoS2‐incorporated electrospun poly(vinlydine fluoride) (PVDF) nanofiber webs (NFW) is described for the first time. As a result of the semiconducting properties and piezoelectric functionalities of 2 D‐MoS2, the resultant piezoelectric performance of PNG can be modulated, which leads to a material suitable for wearable electronics to power devices and to fabricate self‐powered biomedical nanosensors for diagnosis, such as heartbeat monitoring, pressure mapping from footsteps, and speech signal abnormality. We have demonstrated that our PNG has a 70 times improvement in acoustic sensitivity than nanosensors made of neat PVDF NFW and are able to charge a capacitor quickly (e.g., 9 V is charged within 44 s). As a result of the ultrafast chargi...
Uploads
Papers by Biswajit Mahanty