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RISS 인기검색어
- 검색키워드
- 저자 : Pandey Rajagopalan (검색결과 3 건)
- 무료
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Elucidations on the effect of lanthanum doping in ZnO towards enhanced performance nanogenerators
Pandey Rajagopalan,Pramila Jakhar,I. A. Palani,Vipul Singh,Sang Jae Kim 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1
Energy harvesting using semiconducting piezoelectric materials is one of the key areas of current research due to its high biocompatibility, low impedance, and high temperature workable range. In this work, we have optimized the doping of Lanthanum in ZnO towards the realization of enhanced output nanogenerator. We have varied the percentage of lanthanum (0, 1, 2.5, 5 and 7.5%) in the ZnO and systematically studied the piezoelectric response of each device. The piezoelectric output improved three to fourfolds by the incorporation of Lanthanum above 2.5%. The voltage response was further escalated by the controlled annealing in an oxygen environment. The doped and annealed device show eight to ninefolds improved output (~ 13.5 V) compared to the intrinsic device (~ 1.6 V). Material properties were investigated thoroughly along with the piezoelectric using various characterization tools. The device show a high maximum power density (~ 2.5 mW/m2) and was used to charge several commercial capacitors. Finally, the device was demonstrated to work in intruder-safety alarm system application as low-cost device.
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Novel Interfacial Bulk Heterojunction Technique for Enhanced Response in ZnO Nanogenerator
Pandey, Rajagopalan,Maria Joseph Raj, Nirmal Prasanth,Singh, Vipul,Iyamperumal Anand, Palani,Kim, Sang-Jae American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.6
<P>In this paper, a direct sustainable approach for the development of a n-ZnO:p-CuO heterojunction (ZCH) through a simple grinding is reported to be an effective technique to enhance the piezoelectric performance of ZCH/polydimethylsiloxane (PDMS) nanocomposite-based nanogenerators (ZP-PNGs). We have first optimized the best concentration for ZnO/PDMS nanocomposite for the realization of the piezoelectric nanogenerator. Later, with the same configuration, we implemented a novel, simple, facile, frugal, and inexpensive technique to fabricate ZCH. The heterojunction results in the improved charge transfer characteristics, low capacitance, and charge nullification contributing to the enhanced piezoelectric output. This reflects in the improvement of the peak-to-peak piezoelectric potential of the device from 2.7 to 9 V. The instantaneous max power density was found to be 0.2 mW/m<SUP>2</SUP>. The device can work as a force sensor with improved sensitivity of 1.7 V/N compared to 1.05 V/N of the intrinsic device. The device is being systematically studied for load matching and capacitor charging to demonstrate its practicability. Furthermore, we tested our device to harness the biomechanical energy from day-to-day life activities. Finally, the device was used to fabricate sustainable piezoelectric-based smart urinal systems for low-income group countries.</P> [FIG OMISSION]</BR>
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Khandelwal, Gaurav,Chandrasekhar, Arunkumar,Pandey, Rajagopalan,Maria Joseph Raj, Nirmal Prashanth,Kim, Sang-Jae Elsevier Sequoia 2019 Sensors and actuators. B Chemical Vol.282 No.-
<P><B>Abstract</B></P> <P>Mechanical energy harvesting using Triboelectric nanogenerator (TENG) based on the coupling of electrostatic induction and contact electrification is a cost-effective and straightforward process. TENG is well known for harnessing the waste energy at a large scale. Here, we demonstrated the fabrication of enhanced-performance TENG in contact-separation mode by utilizing the facile phase inversion process for only one triboactive layer. The phase inversion is a straightforward technique to achieve films with a porous structure and high crystallinity. The non-piezoelectric, semiconducting TiO<SUB>2</SUB> microparticle acts as charge trapping sites attributed to their high dielectric constant. The PVDF-10-TiO<SUB>2</SUB>/CA TENG showed 7 times and 10 times enhancement for voltage and short circuit current compared to the PVDF-TiO<SUB>2</SUB>/CA TENG prepared without phase inversion process. Furthermore, the device is a multifunctional energy harvester i.e. it can harvest biomechanical as well as wind energy. Finally, we demonstrated the use of TENG device for volatile organic compounds (VOCs) sensing. The device exhibits good response with the change in concentration as well as total flow rate. The voltage decreases with the increase in the benzene concentration. The sensitivity of as fabricated sensor is 0.0035 V/ppm concerning concentration and 0.29176 V/sccm concerning total flow rate. The sensor was integrated with the Arduino Uno for automatic detection of benzene giving the alarm warning for the presence of benzene in the environment. This work extended the application of TENG in the field of VOCs sensing, design and concept which can be applied in the future for the detection of other VOCs in the environment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phase inversion and semi conducting TiO<SUB>2</SUB> based TENG with enhanced performance. </LI> <LI> The TENG shows 7 times and 10 times enhancement for voltage and current. </LI> <LI> Fabricated TENG is multifunctional energy harvester. </LI> <LI> Demonstration of TENG as VOC’s sensor with good selectivity and sensitivity. </LI> <LI> Integration of TENG with Arduino for warning message and alarm to evacuate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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