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VENKATESWARAN VIVEKANANTHAN,Woo Joong Kim,Nagamalleswara Rao Alluri,Yuvasree Purusothaman,Gaurav Khandelwal,김상재 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5
The increasing interest in harvesting mechanical energy from day-to-day activities is gaining huge interest among researchers. We have fabricated a triboelectric nanogenerator (TENG) made of aluminum and PDMS film acting as positive and negative triboelectric layers. The layers are arranged in an arc-shaped structure with an air gap of 1 cm between the layers of the device. The PDMS layer is made by blending the polymer solution with the hardener in an appropriate ratio and dried to make the transparent and flexible polymer film. The device shows a maximum electrical response of 110 V and 260 nA voltage and current with the power density of 2.9 mW/m 2 at 100 MΩ load resistance. Further, the device has been used for lighting green LEDs and charging commercial capacitors. An Arduino board was connected with LED and buzzer, which was triggered by the TENG device. This shows that with the proper usage of electronic components TENG can be used for self-powered sensors and with IoT applications.
A Highly Reliable Self-powered Intruder Identification System using Piezoelectric Composite Films
Venkateswaran Vivekananthan(벤카테스와란 비베카난단),Nagamalleswara Rao Alluri(나가 말레스와라 라오 알루리),Yuvasree Purusothaman(유바스리 푸루소다만),Nirmal Prashanth Maria Joseph (니르말 프라샤츠 마리아 조세프라),Arunkumar Chandrasekhar(아룬쿠마르 찬 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.2
Vivekananthan, Venkateswaran,Alluri, Nagamalleswara Rao,Purusothaman, Yuvasree,Chandrasekhar, Arunkumar,Selvarajan, Sophia,Kim, Sang-Jae American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.22
<P>In contrast with the conventional ceramic/oxide humidity sensors (HSs), a self-powered piezoelectric biopolymer HS with reasonable sensitivity, reliability, and a nontoxic and eco-friendly nature is highly desirable. A piezoelectric nanogenerator (PNG)-driven biopolymer-based HS provides a pathway toward a sustainable and greener environment in the field of smart sensors. For that, a piezoelectric collagen nanofibril biopolymer coated on to a cotton fabric has dual functionality (energy harvesting and sensor). Collagen PNG generates a maximum of 45 V/250 nA upon 5 N and can also work as a sensor to measure various percentages of relative humidity (% RH). The HS shows a linear response with a good sensitivity (0.1287 μA/% RH) in the range of 50-90% RH. These results open a field of eco-friendly multifunctional nanomaterials toward the development of noninvasive, implantable smart bio-medical systems.</P> [FIG OMISSION]</BR>
Chandrasekhar, Arunkumar,Vivekananthan, Venkateswaran,Kim, Sang-Jae Elsevier 2020 Nano energy Vol.69 No.-
<P><B>Abstract</B></P> <P>Water waves are a promising source of renewable energy. Their kinetic energy can potentially drive energy harvesters. Herein, we describe a fully packed spheroidal smart buoy hybrid generator (SB-HG) composed of triboelectric nanogenerator (TENG) and an electromagnetic generator (EMG) for scavenging water-wave energy. Each of the energy harvesting components generated electrical outputs from the same wave motion. A position-tracking long-range (LoRa) device placed in the buoy enabled identification of the buoy location when it was placed in the sea for energy harvesting, navigation, and fishnet tracking purposes. A solar cell placed on the top of the buoy powered the device under calm wave conditions. The TENG and EMG components generated maximum electrical outputs of 100 V/2 μA and 20 V/15 mA, respectively. Combining the devices efficiently converted the kinetic energy of the waves into useful electrical energy, which was used to charge a commercial capacitor and lithium-ion battery. The charged battery drove the position-tracking LoRa device for a positioning application and demonstrated that the SB-HG device is an inexpensive and reliable candidate for ocean navigation systems. Our water-wave energy harvester is highly promising as a clean energy power source and as a self-powered sensor for various environmental monitoring systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A smart buoy hybrid generator is made of TENG-EMG omponents which can be driven by water waves. </LI> <LI> The electrical output of the device is greatly enhanced due to the hybrid configuration. </LI> <LI> The device is made as a scalable and multi-unit device for the enhanced energy harvesting capability in a single device. </LI> <LI> The device is used as a self-powered position tracking by using a LoRa module and interface with mobile phone application. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>