Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.20515807866
E. O. Popov, S. Filippov, A. G. Kolosko
The paper presents a description of a comprehensive technique developed for a multilateral study of the properties of large area field emitters (LAFEs). The main advantages of the technique are the use of various high voltage power supply modes and online analysis of the recorded signals. The technique includes not only the registration of standard emission parameters, but also the analysis of related phenomena -luminescence patterns and mass spectrometric data. In addition, the methodology includes checking the correspondence of the cathode operation mode to classical cold field emission, based on the latest theoretical developments, and computer simulation using COMSOL and LabVIEW packages.
{"title":"Complex methodology for studying the emission properties of multi-tip field cathodes with online data processing","authors":"E. O. Popov, S. Filippov, A. G. Kolosko","doi":"10.1109/PowerMEMS49317.2019.20515807866","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.20515807866","url":null,"abstract":"The paper presents a description of a comprehensive technique developed for a multilateral study of the properties of large area field emitters (LAFEs). The main advantages of the technique are the use of various high voltage power supply modes and online analysis of the recorded signals. The technique includes not only the registration of standard emission parameters, but also the analysis of related phenomena -luminescence patterns and mass spectrometric data. In addition, the methodology includes checking the correspondence of the cathode operation mode to classical cold field emission, based on the latest theoretical developments, and computer simulation using COMSOL and LabVIEW packages.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"25 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83200270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.51289503684
Yang Kuang, M. Zhu
This work presents an experimentally validated impedance-based finite element model (FEM) of a highly-coupled pre-stressed piezoelectric energy harvester (PEH) with piezoelectric multilayer stacks (PMSs). The FEM first simulates the status of the PEH as a result of the static pre-stress. It then analyses the internal impedance$|Z_{in}|$ of the pre-stressed PEH, which is used as the optimal load resistance Ropt for power output generation. The developed FEM is able to precisely predict (1) the maximum power output at each frequency without the tedious load-resistance sweeping approach traditionally used; (2) the dual-power-peaks phenomenon of highly-coupled PEHs, which cannot be observed when using the traditional approach of $R_{opt}=1/omega C_{P}$. This model provides a useful tool for the design and optimization highly-coupled piezoelectric energy harvesters.
{"title":"Impedance-based finite element modelling of a highly-coupled and pre-stressed piezoelectric energy harvester","authors":"Yang Kuang, M. Zhu","doi":"10.1109/PowerMEMS49317.2019.51289503684","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.51289503684","url":null,"abstract":"This work presents an experimentally validated impedance-based finite element model (FEM) of a highly-coupled pre-stressed piezoelectric energy harvester (PEH) with piezoelectric multilayer stacks (PMSs). The FEM first simulates the status of the PEH as a result of the static pre-stress. It then analyses the internal impedance$|Z_{in}|$ of the pre-stressed PEH, which is used as the optimal load resistance Ropt for power output generation. The developed FEM is able to precisely predict (1) the maximum power output at each frequency without the tedious load-resistance sweeping approach traditionally used; (2) the dual-power-peaks phenomenon of highly-coupled PEHs, which cannot be observed when using the traditional approach of $R_{opt}=1/omega C_{P}$. This model provides a useful tool for the design and optimization highly-coupled piezoelectric energy harvesters.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"32 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88279323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.71805303927
L. Wang, Dibin Zhu
This paper reports a novel method to improve output power of a flapping airflow energy harvester by introducing flexible wing sections. The flapping airflow energy harvester consists of a cantilever beam structure with a wing at its free end. A bluff body is placed in front of the wing to induce aerodynamic instability that leads to up and down oscillation of the wing. By coupling transducers to the oscillating wing, electromagnetic in this case, electrical energy can be generated. In this research, instead of using a commonly used rigid wing, the proposed airflow energy harvester has flexible wing sections that are able to bend, thus reduce the aerodynamic resistance during the wing oscillation. Therefore, the overall mechanical damping can be reduced and output power of the proposed energy harvester is increased. It is found experimentally that the proposed method is able to improve energy harvester performance of flapping airflow energy harvesters under high airflow speeds.
{"title":"A Flapping Airflow Energy Harvester with Flexible Wing Sections","authors":"L. Wang, Dibin Zhu","doi":"10.1109/PowerMEMS49317.2019.71805303927","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.71805303927","url":null,"abstract":"This paper reports a novel method to improve output power of a flapping airflow energy harvester by introducing flexible wing sections. The flapping airflow energy harvester consists of a cantilever beam structure with a wing at its free end. A bluff body is placed in front of the wing to induce aerodynamic instability that leads to up and down oscillation of the wing. By coupling transducers to the oscillating wing, electromagnetic in this case, electrical energy can be generated. In this research, instead of using a commonly used rigid wing, the proposed airflow energy harvester has flexible wing sections that are able to bend, thus reduce the aerodynamic resistance during the wing oscillation. Therefore, the overall mechanical damping can be reduced and output power of the proposed energy harvester is increased. It is found experimentally that the proposed method is able to improve energy harvester performance of flapping airflow energy harvesters under high airflow speeds.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"6 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90771246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.82063211368
I. Gablech, J. Klempa, J. Pekárek, P. Vyroubal, J. Kunz, P. Neužil
This work demonstrates the fabrication of simple of AlN-based piezoelectric energy harvesters (PEH), made of cantilevers with thin films prepared by ion beam-assisted deposition. The preferentially (001) orientated AlN thin films have exceptionally high piezoelectric coefficients of (7.33 ± 0.08) pC·$N^{-1}$. The fabrication of PEH was done using only three lithography steps, employing conventional silicon substrate with precise control of the cantilever and it’s mass thicknesses. The AlN deposition was done at a temperature of ≈ 330 °C which makes it compatible with complementary metal oxide semiconductor technology (CMOS). The PEH cantilever deflection and efficiency were characterized using both laser interferometry and a vibration shaker, respectively. This technology could become useful for future CMOS-based energy harvesters integrated on chip with circuits.
{"title":"Aluminum nitride based piezoelectric harvesters","authors":"I. Gablech, J. Klempa, J. Pekárek, P. Vyroubal, J. Kunz, P. Neužil","doi":"10.1109/PowerMEMS49317.2019.82063211368","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.82063211368","url":null,"abstract":"This work demonstrates the fabrication of simple of AlN-based piezoelectric energy harvesters (PEH), made of cantilevers with thin films prepared by ion beam-assisted deposition. The preferentially (001) orientated AlN thin films have exceptionally high piezoelectric coefficients of (7.33 ± 0.08) pC·$N^{-1}$. The fabrication of PEH was done using only three lithography steps, employing conventional silicon substrate with precise control of the cantilever and it’s mass thicknesses. The AlN deposition was done at a temperature of ≈ 330 °C which makes it compatible with complementary metal oxide semiconductor technology (CMOS). The PEH cantilever deflection and efficiency were characterized using both laser interferometry and a vibration shaker, respectively. This technology could become useful for future CMOS-based energy harvesters integrated on chip with circuits.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"21 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84001329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.51289500084
M. Ito, H. Katsumura
To be used as a power supply for a module monitoring the vibration condition, we built a prototype unit capable of storing the power generated by a compact magnetostrictive vibration energy harvester (VEH) in an electric double layer capacitor (EDLC), via a bridge rectifier circuit and boost converter. The prototype could store 3.1 J of energy within ten hours or so, from mechanical vibration of 100 Hz, $4mathrm{m}/ mathrm{s}^{2}$. The storage energy enables about 7800 times the triple-axis acceleration measurement and wireless transmission, or five times the operation of wireless vibration condition monitoring module commercially available. The EDLC storage efficiency was 25% compared to the effective value of magnetostrictive VEH output power. Despite the need to further boost efficiency, it is noteworthy that we could demonstrate scope to operate the vibration condition monitoring module using only the power generated by magnetostrictive VEH.
{"title":"Prototyping of Power Supply for Vibration Condition Monitoring Modules using a Magnetostrictive Vibration Energy Harvester","authors":"M. Ito, H. Katsumura","doi":"10.1109/PowerMEMS49317.2019.51289500084","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.51289500084","url":null,"abstract":"To be used as a power supply for a module monitoring the vibration condition, we built a prototype unit capable of storing the power generated by a compact magnetostrictive vibration energy harvester (VEH) in an electric double layer capacitor (EDLC), via a bridge rectifier circuit and boost converter. The prototype could store 3.1 J of energy within ten hours or so, from mechanical vibration of 100 Hz, $4mathrm{m}/ mathrm{s}^{2}$. The storage energy enables about 7800 times the triple-axis acceleration measurement and wireless transmission, or five times the operation of wireless vibration condition monitoring module commercially available. The EDLC storage efficiency was 25% compared to the effective value of magnetostrictive VEH output power. Despite the need to further boost efficiency, it is noteworthy that we could demonstrate scope to operate the vibration condition monitoring module using only the power generated by magnetostrictive VEH.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"24 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82798363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.51289506488
Yasemin Engür, H. Uluşan, H. Yigit, S. Chamanian, H. Külah
This paper presents a mixed mode rectifier circuit operating at 13.56 MHz for wireless power transmission system to rectify the AC signal and power up the implantable medical device. The proposed design includes both voltage and current mode operation that covers a wide range of coupling ratios between the coils. The circuit is designed in 180 nm CMOS technology. Extracted simulations show that the mixed mode design charges the load with the maximum efficiency 72.4% for the voltage mode, and 38.6% for the current mode at the operating frequency 13.56 MHz for both modes. The voltage and current modes are beneficial for high and low coupling ratios, respectively. Operation under different modes extends the usable coupling range in power transmission.
{"title":"13.56 MHz Mixed Mode Rectifier Circuit for Implantable Medical Devices","authors":"Yasemin Engür, H. Uluşan, H. Yigit, S. Chamanian, H. Külah","doi":"10.1109/PowerMEMS49317.2019.51289506488","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.51289506488","url":null,"abstract":"This paper presents a mixed mode rectifier circuit operating at 13.56 MHz for wireless power transmission system to rectify the AC signal and power up the implantable medical device. The proposed design includes both voltage and current mode operation that covers a wide range of coupling ratios between the coils. The circuit is designed in 180 nm CMOS technology. Extracted simulations show that the mixed mode design charges the load with the maximum efficiency 72.4% for the voltage mode, and 38.6% for the current mode at the operating frequency 13.56 MHz for both modes. The voltage and current modes are beneficial for high and low coupling ratios, respectively. Operation under different modes extends the usable coupling range in power transmission.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"25 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78443350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.61547405528
A. Johnson, R. Kohlmeyer, M. Ates, C. Kiggins, A. Blake, X. Yue, J. Cook, J. Pikul
This work reports the design and simulated performance of high energy density lithium metal primary microbatteries whose 2016 Wh/L and 605 Wh/kg energy densities are 3X greater than the best microbatteries. The simulations match experimental data and give insight into the excellent energy and power density performance. The high energy density is the result of the ultra-thick and dense cathode which has high lithium-ion diffusivity and electronic conductivity. These results show great promise towards realizing the next generation of high performance microbatteries.
{"title":"Performance Modeling and Design of High Energy Density Microbatteries","authors":"A. Johnson, R. Kohlmeyer, M. Ates, C. Kiggins, A. Blake, X. Yue, J. Cook, J. Pikul","doi":"10.1109/PowerMEMS49317.2019.61547405528","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.61547405528","url":null,"abstract":"This work reports the design and simulated performance of high energy density lithium metal primary microbatteries whose 2016 Wh/L and 605 Wh/kg energy densities are 3X greater than the best microbatteries. The simulations match experimental data and give insight into the excellent energy and power density performance. The high energy density is the result of the ultra-thick and dense cathode which has high lithium-ion diffusivity and electronic conductivity. These results show great promise towards realizing the next generation of high performance microbatteries.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"15 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87772273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.8206320100884
A. G. Kolosko, S. Filippov, M. Chumak, E. O. Popov, G. Demin, I. D. Evsikov, N. Djuzhev
The paper considers the features of evaluating the effective parameters of nanostructured field cathodes – the area of the field emission Seff and the field gain $beta_{eff}$. A variety of approaches to parameter estimates is shown. The dependence of these estimates on the magnitude of the applied electric voltage is shown by the example of a three-dimensional model of a carbon nanotube. The possibility of the experimentally estimation of individual emission sites using a computerized field projector is considered. A method for analyzing the current-voltage characteristics in Fowler-Nordheim coordinates (IVC-FN) with an interval estimate of the effective parameters is proposed.
{"title":"Features of evaluating properties of field emitters using effective parameters","authors":"A. G. Kolosko, S. Filippov, M. Chumak, E. O. Popov, G. Demin, I. D. Evsikov, N. Djuzhev","doi":"10.1109/PowerMEMS49317.2019.8206320100884","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.8206320100884","url":null,"abstract":"The paper considers the features of evaluating the effective parameters of nanostructured field cathodes – the area of the field emission Seff and the field gain $beta_{eff}$. A variety of approaches to parameter estimates is shown. The dependence of these estimates on the magnitude of the applied electric voltage is shown by the example of a three-dimensional model of a carbon nanotube. The possibility of the experimentally estimation of individual emission sites using a computerized field projector is considered. A method for analyzing the current-voltage characteristics in Fowler-Nordheim coordinates (IVC-FN) with an interval estimate of the effective parameters is proposed.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"17 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84734916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.92321112648
B. Truong, Caleb Roundy, R. Rantz, S. Roundy
This paper presents a device concept that allows us to utilize the coils of an electromagnetic vibration-based energy harvester as a receiver for a magnetic resonant coupled wireless power transfer system (WPTS), with focus on low-power wearable applications. The parasitic capacitances of the coils along with their inductances form a single equivalent receiver coil configured in parallel. This self-resonance characteristic relaxes the requirement of adding an additional capacitor and still retains the system inherent simplicity. Measurements with an arbitrarily chosen load resistance of $R_{L},= 100 Omega$ demonstrate a generated power of $sim 397.4 mu W$ at a distance between the transmitter and receiver of 2 cm at a root mean square applied $mathbf{B}$ – field of $200 mu T$, approximately.
本文提出了一种设备概念，使我们能够利用基于电磁振动的能量采集器线圈作为磁谐振耦合无线电力传输系统(WPTS)的接收器，重点是低功耗可穿戴应用。线圈的寄生电容与其电感形成并联配置的单个等效接收线圈。这种自谐振特性放宽了增加额外电容器的要求，仍然保留了系统固有的简单性。任意选择负载电阻$R_{L},= 100 Omega$的测量表明，在发射机和接收机之间的距离为2厘米处，施加$mathbf{B}$ -场的均方根为$200 mu T$，产生的功率约为$sim 397.4 mu W$。
{"title":"Energy harvesting and wireless power transfer in a unified system for wearable devices","authors":"B. Truong, Caleb Roundy, R. Rantz, S. Roundy","doi":"10.1109/PowerMEMS49317.2019.92321112648","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.92321112648","url":null,"abstract":"This paper presents a device concept that allows us to utilize the coils of an electromagnetic vibration-based energy harvester as a receiver for a magnetic resonant coupled wireless power transfer system (WPTS), with focus on low-power wearable applications. The parasitic capacitances of the coils along with their inductances form a single equivalent receiver coil configured in parallel. This self-resonance characteristic relaxes the requirement of adding an additional capacitor and still retains the system inherent simplicity. Measurements with an arbitrarily chosen load resistance of $R_{L},= 100 Omega$ demonstrate a generated power of $sim 397.4 mu W$ at a distance between the transmitter and receiver of 2 cm at a root mean square applied $mathbf{B}$ – field of $200 mu T$, approximately.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"153 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84967228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/PowerMEMS49317.2019.008
A. Vyas, Q. Li, R. V. D. Eeckhoudt, G. Geréb, A. Smith, C. Rusu, P. Lundgren, P. Enoksson
We present the first results of a flexible energy harvester and a foldable supercapacitor to power wearable and flexible sensors. The flexible energy harvester is fabricated by using $38 mu m$ piezoelectric polyvinylidene difluoride (PVDF) sandwiched between carbon-electrodes. Both the design and process excel in simplicity and cost-effectiveness. The flexible harvester demonstrates a power output of $2.6 mu W$ cm-3 at a resonant frequency of 50 Hz with a 3dB bandwidth of about 11 Hz, which is higher than devices previously reported and similar to a commercial PZT harvester film of same size. A flexible energy storage supercapacitor (GP-SC) was fabricated using a graphite/VACNTs (vertically aligned carbon nanotubes) material as electrodes. A prototype GP-SCs has an areal capacitance of about 1.2 mF cm-2. Finally, an integrated scheme is proposed for future work.
{"title":"Towards Integrated Flexible Energy Harvester and Supercapacitor for Self-powered Wearable Sensors","authors":"A. Vyas, Q. Li, R. V. D. Eeckhoudt, G. Geréb, A. Smith, C. Rusu, P. Lundgren, P. Enoksson","doi":"10.1109/PowerMEMS49317.2019.008","DOIUrl":"https://doi.org/10.1109/PowerMEMS49317.2019.008","url":null,"abstract":"We present the first results of a flexible energy harvester and a foldable supercapacitor to power wearable and flexible sensors. The flexible energy harvester is fabricated by using $38 mu m$ piezoelectric polyvinylidene difluoride (PVDF) sandwiched between carbon-electrodes. Both the design and process excel in simplicity and cost-effectiveness. The flexible harvester demonstrates a power output of $2.6 mu W$ cm-3 at a resonant frequency of 50 Hz with a 3dB bandwidth of about 11 Hz, which is higher than devices previously reported and similar to a commercial PZT harvester film of same size. A flexible energy storage supercapacitor (GP-SC) was fabricated using a graphite/VACNTs (vertically aligned carbon nanotubes) material as electrodes. A prototype GP-SCs has an areal capacitance of about 1.2 mF cm-2. Finally, an integrated scheme is proposed for future work.","PeriodicalId":6648,"journal":{"name":"2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"71 1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91119346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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