Effect of contact- and sliding-mode electrification on nanoscale charge transfer for energy harvesting
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The process of charge transfer based on triboelectrification (TE) and contact electrification (CE) has been recently utilized as the basis for a new and promising energy harvesting technology, i.e., triboelectric nanogenerators, as well as selfpowered sensors and systems. The electrostatic charge transfer between two surfaces can occur in both the TE and the CE modes depending on the involvement of relative sliding friction. Does the sliding behavior in TE induce any fundamental difference in the charge transfer from the CE? Few studies are available on this comparison because of the challenges in ruling out the effect of the contact area using traditional macro-scale characterization methods. This paper provides the first study on the fundamental differences in CE and TE at the nanoscale based on scanning probe microscopic methods. A quantitative comparison of the two processes at equivalent contact time and force is provided, and the results suggest that the charge transfer from TE is much faster than that from CE, but the saturation value of the transferred charge density is the same. The measured frictional energy dissipation of ~11 eV when the tip scans over distance of 1 Å sheds light on a potential mechanism: The friction may facilitate the charge transfer process via electronic excitation. These results provide fundamental guidance for the selection of materials and device structures to enable the TE or the CE in different applications; the CE mode is favorable for frequent moderate contact such as vibration energy harvesting and the TE mode is favorable for instant movement such as harvesting of energy from human walking.
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Effect of contact- and sliding-mode electrification on nanoscale charge transfer for energy harvesting
)
Abstract
The process of charge transfer based on triboelectrification (TE) and contact electrification (CE) has been recently utilized as the basis for a new and promising energy harvesting technology, i.e., triboelectric nanogenerators, as well as selfpowered sensors and systems. The electrostatic charge transfer between two surfaces can occur in both the TE and the CE modes depending on the involvement of relative sliding friction. Does the sliding behavior in TE induce any fundamental difference in the charge transfer from the CE? Few studies are available on this comparison because of the challenges in ruling out the effect of the contact area using traditional macro-scale characterization methods. This paper provides the first study on the fundamental differences in CE and TE at the nanoscale based on scanning probe microscopic methods. A quantitative comparison of the two processes at equivalent contact time and force is provided, and the results suggest that the charge transfer from TE is much faster than that from CE, but the saturation value of the transferred charge density is the same. The measured frictional energy dissipation of ~11 eV when the tip scans over distance of 1 Å sheds light on a potential mechanism: The friction may facilitate the charge transfer process via electronic excitation. These results provide fundamental guidance for the selection of materials and device structures to enable the TE or the CE in different applications; the CE mode is favorable for frequent moderate contact such as vibration energy harvesting and the TE mode is favorable for instant movement such as harvesting of energy from human walking.
References(25)
Horn, R. G.; Smith, D. T. Contact electrification and adhesion between dissimilar materials. Science 1992, 256, 362–364.
Horn, R. G.; Smith, D. T.; Grabbe, A. Contact electrification induced by monolayer modification of a surface and relation to acid-base interactions. Nature 1993, 366, 442–443.
Baytekin, H. T.; Patashinski, A. Z.; Branicki, M.; Baytekin, B.; Soh, S.; Grzybowski, B. A. The mosaic of surface charge in contact electrification. Science 2011, 333, 308–312.
Baytekin, H. T.; Baytekin, B.; Hermans, T. M.; Kowalczyk, B.; Grzybowski, B. A. Control of surface charges by radicals as a principle of antistatic polymers protecting electronic circuitry. Science 2013, 341, 1368–1371.
Niu, S. M.; Wang, S. H.; Lin, L.; Liu, Y.; Zhou, Y. S.; Hu, Y. F.; Wang, Z. L. Theoretical study of contact-mode triboelectric nanogenerators as an effective power source. Energy Environ. Sci. 2013, 6, 3576–3583.
Wang, S. H.; Lin, L.; Wang, Z. L. Nanoscale triboelectriceffect- enabled energy conversion for sustainably powering portable electronics. Nano Lett. 2012, 12, 6339–6346.
Wang, Z. L.; Chen, J.; Lin, L. Progress in triboelectric nanogenerators as a new energy technology and self-powered sensors. Energy Environ. Sci. 2015, 8, 2250–2282.
Zhou, Y. S.; Zhu, G.; Niu, S. M.; Liu, Y.; Bai, P.; Jing, Q. S.; Wang, Z. L. Nanometer resolution self-powered static and dynamic motion sensor based on micro-grated triboelectrification. Adv. Mater. 2014, 26, 1719–1724.
Zhu, G.; Zhou, Y. S.; Bai, P.; Meng, X. S.; Jing, Q. S.; Chen, J.; Wang, Z. L. A shape-adaptive thin-film-based approach for 50% high-efficiency energy generation through micro-grating sliding electrification. Adv. Mater. 2014, 26, 3788–3796.
Ireland, P. M. The role of changing contact in sliding triboelectrification. J. Phys. D: Appl. Phys. 2008, 41, 025305.
Ohara, K. A method of exponential function analysis of contact and frictional electrification curves. J. Electrostat. 1988, 20, 319–326.
Tokeshi, T.; Hiratsuka, K.; Sasaki, A.; Uchiyama, S.; Kajdas, C. Triboelectrification in sliding/rolling contacts using twin-ring tribometer. Tribol. Trans. 2009, 52, 759–767.
Zhou, Y. S.; Liu, Y.; Zhu, G.; Lin, Z. H.; Pan, C. F.; Jing, Q. S.; Wang, Z. L. In situ quantitative study of nanoscale triboelectrification and patterning. Nano Lett. 2013, 13, 2771–2776.
Zhou, Y. S.; Wang, S. H.; Yang, Y.; Zhu, G.; Niu, S. M.; Lin, Z. H.; Liu, Y.; Wang, Z. L. Manipulating nanoscale contact electrification by an applied electric field. Nano Lett. 2014, 14, 1567–1572.
García, R.; Pérez, R. Dynamic atomic force microscopy methods. Surf. Sci. Rep. 2002, 47, 197–301.
Cappella, B.; Dietler, G. Force–distance curves by atomic force microscopy. Surf. Sci. Rep. 1999, 34, 1–104.
Cleveland, J. P.; Anczykowski, B.; Schmid, A. E.; Elings, V. B. Energy dissipation in tapping-mode atomic force microscopy. Appl. Phys. Lett. 1998, 72, 2613–2615.
García, R.; Gómez, C. J.; Martinez, N. F.; Patil, S.; Dietz, C.; Magerle, R. Identification of nanoscale dissipation processes by dynamic atomic force microscopy. Phys. Rev. Lett. 2006, 97, 016103.
García, R.; San Paulo, A. Attractive and repulsive tipsample interaction regimes in tapping-mode atomic force microscopy. Phys. Rev. B 1999, 60, 4961–4967.
Bhushan, B.; Israelachvili, J. N.; Landman, U. Nanotribology: Friction, wear and lubrication at the atomic scale. Nature 1995, 374, 607–616.
Braun, O. M.; Naumovets, A. G. Nanotribology: Microscopic mechanisms of friction. Surf. Sci. Rep. 2006, 60, 79–158.
Marti, O. Nanotribology: Friction on a nanometer scale. Phys. Scr. 1993, 49B, 599–604.
Singer, I. L. Friction and energy dissipation at the atomic scale: A review. J. Vac. Sci. Technol. A 1994, 12, 2605–2616.
Krim, J. Friction and energy dissipation mechanisms in adsorbed molecules and molecularly thin films. Adv. Phys. 2012, 61, 155–323.
Park, J. Y.; Salmeron, M. Fundamental aspects of energy dissipation in friction. Chem. Rev. 2014, 114, 677–711.
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Acknowledgements
Research was supported by U.S. Department of Energy, Office of Basic Energy Sciences (No. DE-FG02- 07ER46394) and the National Science Foundation (No. DMR-1505319). We also would like to express our sincere appreciation to Dr. Ricardo Garcia for the insightful discussion on modeling and calculation of the dynamic motion of the cantilever in tapping mode AFM.
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