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54. Bowen Zhang, Dan Tan, Xiaodan Cao, Junyuan Tian, Yonggui Wang, Jinxi Zhang, Zhong Lin Wang*, andKailiang Ren*. Flexoelectricity-Enhanced Photovoltaic Effect in Self-Polarized Flexible PZT Nanowire Array Devices[J].ACS Nano, 2022, 10(10): 3276-3287.
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53. Xuexin Li, Bowen Zhang, Xiaodan Cao, Biaolin Peng*,Kailiang Ren*. Large strain response in (Bi0. 5Na0. 5) TiO3–6BaTiO3-based lead-free ceramics at high temperature[J].Ceramics International, 2022, 48(7): 9051-9058.
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SEM images with as sintered surfaces of the BNT-6BT-xBCO ceramics with different BCO concentrations. |
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52. Ao Yan, Xiaoting Yuan, Zhanmiao Li, Jikun Yang,Kailiang Ren, Shuxiang Dong*. 3D-printed flexible, multilayered ceramic-polymer composite grid with integrated structural-self-sensing function[J].Sensors and Actuators A: Physical, 2021, 332: 113187.
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Structure diagram of three-dimensional multilayer sample. |
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51. Yonggui Wang, Jinxi Zhang, Bowen Zhang,Kailiang Ren*. Poly (lactic acid)‐Based Film with Excellent Thermal Stability for High Energy Density Capacitor Applications[J]. Macromolecular Materials and Engineering, 2021, 306(11): 2100402.
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Schematic diagram of the fabrication process of stretched PLLA and PDLA polymer films. |
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50. Feifei Han, Yuhao Hu, Biaolin Peng*, Laijun Liu, Rusen Yang,Kailiang Ren*. High dielectric tunability with high thermal stability of the (111) highly oriented 0.85 Pb (Mg1/3Nb2/3)-0.15 PbTiO3 thin film prepared by a sol-gel method[J].Journal of the European Ceramic Society, 2021, 41(13): 6482-6489.
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Characterization of PMN-15PT thin film. |
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49. Chengyan Zhao, Xidi Sun, Wenshi Li, Mingwei Shi,Kailiang Ren*, Xianmao Lu*. Reduced Self-Discharge of Supercapacitors Using Piezoelectric Separators[J].ACS Applied Energy Materials, 2021, 4(8): 8070-8075.
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Schematic illustration of the self-discharge processes of supercapacitors with piezoelectric and traditional separators. |
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48. Xiaodan Cao, Chenchen Wang, Kai Han, Xianmao Lu*, Nengneng Luo*, andKailiang Ren*. Lead-free AgNbO3/poly (vinylidene fluoride‐hexafluoropropylene) antiferroelectric nanocomposite for high energy density capacitor applications[J].Journal of Physics D: Applied Physics, 2021, 54(40): 405501.
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Schematic diagram for the fabrication process of the AgNbO3-g-PMMA/PVDF-HFP (AN-g-PMMA/HFP) nanocomposite film. |
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47. Shuangzhe Zhang, Bowen Zhang, Jinxi Zhang, andKailiang Ren*. Enhanced Piezoelectric Performance of Various Electrospun PVDF Nanofibers and Related Self-Powered Device Applications[J].ACS Applied Materials & Interfaces, 2021, 13(27): 32242-32250.
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Schematic diagram of the sensor device structure. |
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46. Jiayuan Li, Jinxi Zhang, Shuangzhe Zhang,Kailiang Ren*. 2D MoS2 Nanosheet‐Based Polyimide Nanocomposite with High Energy Density for High Temperature Capacitor Applications[J].Macromolecular Materials and Engineering, 2021, 306(7): 2100079.
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Schematic diagram of the fabrication process of the MoS2-g-PMMA/PI (where PI is polyimide) nanocomposite films. |
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45. Chenchen Wang, Yang Zhang, Bowen Zhang, Bo Wang, Jinxi Zhang, Long-Qing Chen, Qiming Zhang, Zhong Lin Wang*,Kailiang Ren*. Flexophotovoltaic Effect in Potassium Sodium Niobate/Poly (Vinylidene Fluoride‐Trifluoroethylene) Nanocomposite[J].Advanced Science, 2021, 8(8): 2004554.
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Schematic drawing of the dipole structure and energy band diagram of the nanocomposite with poling. |
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44. Shaobo Gong, Jinxi Zhang, Chenchen Wang,Kailiang Ren*. Theoretical and experimental study of a monocharged electret for pressure sensor applications[J].Journal of Applied Physics, 2021, 129(3): 034501.
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Schematic drawings of (a) the MENG-based sensor and (b) the experimental setup. |
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43. Jinxi Zhang, Shaobo Gong, Xin Li, Junrui Liang, Zhong Lin Wang*,Kailiang Ren*. A Wind‐Driven Poly (tetrafluoroethylene) Electret and Polylactide Polymer‐Based Hybrid Nanogenerator for Self‐Powered Temperature Detection System[J].Advanced Sustainable Systems, 2021, 5(1): 2000192.
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42. Shaobo Gong, Bowen Zhang, Jinxi Zhang, Kailiang Ren*. Biocompatible Poly(lactic acid)‐Based Hybrid Piezoelectric and Electret Nanogenerator for Electronic Skin Applications[J]. Advanced Functional Materials, 2020, 30(14):1908724
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Biocompatible woven E-skin device |
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41. Shuang Qiao, Mingjing Chen, Yu Wang, Jihong Liu, Junfeng Lu, Fangtao Li, Guangsheng Fu, Shufang Wang, Kailiang Ren*, Caofeng Pan*. Ultrabroadband, Large Sensitivity Position Sensitivity Detector Based on a Bi2Te2.7Se0.3/Si Heterojunction and Its Performance Improvement by Pyro‐Phototronic Effect[J]. Advanced Electronic Materials, 2019. DOI:10.1002/aelm.201900786. |
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The LPE in the Bi2Te2.7Se0.3/Si heterojunction and its properties |
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40. Jinxi Zhang, Shaobo Gong, Chenchen Wang, Dae‐Yong Jeong, Kailiang Ren*. Biodegradable Electrospun Poly(lactic acid) Nanofibers for Effective PM 2.5 Removal[J]. Macromolecular Materials and Engineering, 2019, 304(10).
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The structure of the PLLA filter which can effectively filter PM2.5 |
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39. Shuang Qiao, Jihong Liu, Guangsheng Fu, Shufang Wang, Kailiang Ren*, Caofeng Pan*. Laser-induced photoresistance effect in Si-based vertical standing MoS2 nanoplates heterojunction for self-powered high-performance broadband photodetector[J]. Journal of Materials Chemistry C, 8,7(34),2019.
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Lateral photoelectric effect in the MoS2/Si heterojunction, the surface layer resistance and LPV curve of the heterojunction as a function of laser position |
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38. Shaobo Gong, Jinxi Zhang, Chenchen Wang, Kailiang Ren*. A Monocharged Electret Nanogenerator-Based Self-Powered Device for Pressure and Tactile Sensor Applications[J]. Advanced Functional Materials, 2019.
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The self-powered MENG sensor and the simulation of its performance in response to pressure |
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37. Chunlin Zhao, Qian Zhang, Wenliang Zhang, Xinyu Du, Yang Zhang, Shaobo Gong, Kailiang Ren*, Qijun Sun*. Hybrid Piezo/Triboelectric Nanogenerator for Highly Efficient and Stable Rotation Energy Harvesting[J]. Nano Energy, 2018.
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H-P/Tengs and the open-circuit voltage and short-circuit current of the bimorph-based PENG. |
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36. Chenchen Wang, Jinxi Zhang, Shaobo Gong, Kailiang Ren*. Significantly enhanced breakdown field for core-shell structured poly(vinylidene fluoride-hexafluoropropylene)/TiO_2 nanocomposites for ultra-high energy density capacitor applications[J]．Journal of Applied Physics, 2018,124(15):154103.1-154103.7.
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Properties of the PVDF-HFP/TiO2-g-PMMA nanocomposite film |
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35. Shuang Qiao; Ridong Cong; Jihong Liu; B.L. Liang; G.S. Fu; Wei Yu; Kailiang Ren*, Shufang Wang; Caofeng Pan*, "CVD-prepared vertical layered MoS2/Si heterojunction for ultrahigh and ultrafast photo response photodetector, Journal of Materials Chemistry C, 6, 13, 3233-3239, 2018.
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The photodetector exhibits high photoelectric performances in a wide broadband ranging from visible to near-infrared with a photoresponsivity of up to 908.2 mA W-1, and a detectivity of up to 1.889 1013 Jones.
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34. Shuang Qiao, Jihong Liu, X. Niu, Baolai Liang, Guagnsheng Fu, Zhiqinag Li, Shufang Wang; Kailiang Ren*, Caofeng Pan* "Piezo-phototronic effect enhanced photo response of the flexible CIGS heterojunction photodetectors“,Advanced Functional Materials, 28,19, 1707311, 2018.
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a) Structure diagram of ITO/ZnO/CdS/CIGS/Mo/PI photodetector. b) SEM top view image of ZnO nanowires. c) SEM cross‐section view image of the ZnO/CdS/CIGS/Mo sample. d) XRD diffraction pattern obtained from the device.
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33. Shuang Qiao, Jihong Liu, Guangsheng Fu, Kailiang Ren*, ZhiqiangLi*, Shufang Wang, Caofeng Pan*, ZnO nanowire based CIGS solar cell and its efficiency enhancement by the piezo-phototronic effect,Nano Energy, 49, 508-514, 2018.
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The ZnO nanowires are introduced into the CIGS solar cells on both rigid and flexible substrates. The ZnO nanowire CIGS solar cells still exhibit very good photovoltaic performances. More importantly, the PCE of rigid device can be modulated from 9.83% to 11.40% under external pressures, and the PCE of flexible device increases from 4.82% to 5.96% with adding external strains. |
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32. Jinxi Zhang, Xinyu Du, Chenchen Wang, and Kailiang Ren*, poly(vinylidene fluoride-hexafluoropropylene) based Blend Film for Ultrahigh Energy Density Capacitor Applications, Journal of Physics D: applied physics,51, 25, 255306, 2018.
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The characteristic Weibull breakdown strength reached 814 MV/m when the ratio between the PVDF-TrFE and PVDF-HFP composition was 5:5. |
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31. Shaobo Gong, James E. West,Kailiang Ren*, , Monocharged Electret Generator for Wearable Energy Harvesting Applications,Advanced Sustainable Systems, 2, 5, 1700178, 201.
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A theory based on the electrostatic effect is derived for the first time for a monocharged electret generator (MCEG). The testing result demonstrates that the MCEG‐based shoe insole device can generate a maximum open‐circuit voltage of 178 V and the maximum power of 35.63 W during walking. This device shows great promise for wearable self‐powered device applications. |
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30. Aochen Wang, Zhuo Liu, Ming Hu, Chenchen Wang, Xiaodi Zhang, Bojing Shi, Yubo Fan, Yonggang Cui, Zhou Li* and Kailiang Ren*, Piezoelectric nanofibrous scaffolds as in vivo energy harvesters for modifying fibroblast alignment and proliferation in wound healing. Nano Energy, 43, 63-71, 2018.
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In vitro cytocompatibility of L929 fibroblast cells on the stable electrospun P(VDF-TrFE) nanofiber scaffolds. |
29. Chunlin Zhao, Jinxi Zhang, andKailiang Ren*, A Poly(l-Lactic Acid) Polymer-Based Thermally Stable Cantilever for Vibration Energy Harvesting Applications[J].Advanced sustainable systems, 2017,1:1700068.
DOI:10.1002/adsu.201700068
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a) The charging time dependence of voltage on the lithium battery under steady vibration excitation of the PLLA cantilever. The inset shows 30 LEDs lit up by the lithium battery after harvesting vibration energy. b) The voltage profile of the lithium battery, which is charged by the PLLA cantilever device and discharged at 10 A. |
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28. Gengrui Zhao, Baisheng Huang, Jinxi Zhang, Aochen Wang, Kailiang Ren*. Electrospun Poly(L-Lactic Acid) Nanofibers for Nanogenerator and Diagnostic Sensor Applications[J].Macromolecular Materials and Engineering, 2017, 302:1600476.
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Comparison voltage and current output for an electro-spun PLLA nanofiber and a melting drawn PLLA nanofiber, where both PLLA fibers were treated with annealing and supercritical CO2 treatment. |
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A schematic drawing of the experimental set-up used in the FTIR measurement and a DC electric field was applied on the PLLA film during the measurement. |
| 26. Ren K, Bortolin R S, Zhang Q M, et al. An investigation of a thermally steerable electroactive polymer/shape memory polymer hybrid actuator[J]. Applied Physics Letters, 2016, 108(6) |
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Picture of the hybrid actuators after being heated to 120？ C for samples with the different thickness ratios (tSMP/tEAP) of (a) 1/0.944？=？1.06, (b) 1/0.53？=？1.88, and (c) 1/0.32？=？3.13. |
| 25.Ren K, West J E, Yu S M, et al.Planar microphone based on piezoelectric electrospun poly( -benzyl- ,L-glutamate) nanofibers.[J]. Journal of the Acoustical Society of America, 2014, 135(6): 2339-2339. |
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Pictures of pressure microphone (a) and velocity microphone (b) based on piezoelectric PBLG film. Both front and back sides are shown for velocity microphone |
| 24.Ren K, Wilson W L, West J E, et al. Piezoelectric property of hot pressed electrospun poly( -benzyl- , L-glutamate) fibers[J]. Applied Physics A, 2012, 107(3): 639-646. |
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Schematics of electrospinning and PBLG poling process. -helical molecular structure of PBLG is shown without side chains for simplicity. |
| 23. Farrar D, Ren K, Cheng D, et al. Permanent Polarity and Piezoelectricity of Electrospun ‐Helical Poly( ‐Amino Acid) Fibers[J]. Advanced Materials, 2011, 23(34): 3954-3958. |
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Schematics of fi ber bundle bending test (A) and movement of fi ber bundle at the left end (left panel) and right end (right panel) in response to a 500 V downward uniform electric fi eld (B). |
| 22. Pisani M B, Ren K, Kao P, et al. Application of Micromachined Y -Cut-Quartz Bulk Acoustic Wave Resonator for Infrared Sensing[J]. IEEE\/ASME Journal of Microelectromechanical Systems, 2011, 20(1): 288-296. |
| 21.Chen Q, Ren K, Chu B, et al. Relaxor Ferroelectric Polymers–Fundamentals and Applications[J]. Ferroelectrics, 2011, 354(1): 178-191. |
| 20.Zhang S, Neese B, Ren K, et al. Relaxor Ferroelectric Polymers, Thin Film Devices, and Ink-Jet Microprinting for Thin Film Device Fabrication[J]. Ferroelectrics, 2011, 342(1): 43-56. |
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18.Ren K, Liu Y, Hofmann H F, et al. An active energy harvesting scheme with an electroactive polymer[J]. Applied Physics Letters, 2007, 91(13).
DOI:10.1063/1.2793172 |
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Typical energy harvesting cycle for a piezoelectric materials |
| 17.Wang Y, Ren K, Zhang Q M, et al. Direct piezoelectric response of piezopolymer polyvinylidene fluoride under high mechanical strain and stress[J]. Applied Physics Letters, 2007, 91(22). |
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The piezoelectric d31 as a function of (a) ac stress amplitude Tac and (b) ac strain amplitude Sac' (the curve is drawn to guide the eyes) at short circuit condition. |
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16.Neese B, Wang Y, Chu B, et al. Piezoelectric responses in poly(vinylidene fluoride/hexafluoropropylene) copolymers[J]. Applied Physics Letters, 2007, 90(24).
DOI:10.1063/1.2748076 |
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XRD taken from both unstretched and uniaxially stretched P(VDF-HFP) 10wt% copolymers. |
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15. Chen Q, Natale D, Neese B, et al. Piezoelectric Polymers Actuators for Precise Shape Control of Large Scale Space Antennas[J]. Electroactive Polymer Actuators and Devices, 2007,6524:5241.
DOI:10.1117/12.717696. |
| 14. Ren K, Liu S, Lin M, et al. A compact electroactive polymer actuator suitable for refreshable Braille display[J]. Proceedings of SPIE, 2007, 6524(1). |
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13. Chen Q, Ren K, Chu B, et al. Relaxor Ferroelectric Polymers-Fundamentals and Applications[J]. Ferroelectrics, 2007.
DOI:10.1080/00150190701455891. |
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12. Zhang S.H., Neese, B., Ren K.L.,et al. Relaxor ferroelectric polymers, thin film devices, and ink-jet microprinting for thin film device fabrication [J]. Ferroelectrics, 2006, 342:43.
DOI:10.1080/00150190600946146. |
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11. Chu B, Zhou X, Ren K, et al. A Dielectric Polymer with High Electric Energy Density and Fast Discharge Speed[J]. Science, 2006, 313(5785): 334-336.
DOI:10.1126/science.1127798. |
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(A) D-E loops for P(VDF-TrFE) 75/25 mol% (dotted lines) and P(VDF-TrFE–CFE) 58.3/34.2/7.5 mol% (solid lines) measured at 10 Hz. The shaded blue areas indicate the energy density. (B) The discharged energy density measured from the D-E loops and Keff as a function of the field amplitude. The solid curves are drawn to guide eyes. |
| 10. Ren K, Liu Y, Geng X, et al. Single crystal PMN-PT/Epoxy 1-3 composite for energy-harvesting application[J]. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2006, 53(3): 631-638. |
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9. Zhang S, Neese B, Ren K, et al. Microstructure and electromechanical responses in semicrystalline ferroelectric relaxor polymer blends[J]. Journal of Applied Physics, 2006, 100(4).
DOI:10.1063/1.2335778. |
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(a) DMA loss spectra of P(VDF-TrFE-CFE)/PMMA blends at 1Hz. The labels refer to the concentration of PMMA in the blends. (b) Summary of the peak temperature in the DMA loss spectra as a function of PMMA concentration in the blends. |
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8. Zhang S, Klein R J, Ren K, et al. Normal ferroelectric to ferroelectric relaxor conversion in fluorinated polymers and the relaxor dynamics[J]. Journal of Materials Science, 2006, 41(1): 271-280.
DOI:10.1007/s10853-006-6081-2. |
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7. Zhang S, Chu B, Neese B, et al. Direct spectroscopic evidence of field-induced solid-state chain conformation transformation in a ferroelectric relaxor polymer[J]. Journal of Applied Physics, 2006, 99(4).
DOI:10.1063/1.2169659. |
| 6. Liu Y.M., Ren K.L., Hofmann H.F., et al. Investigation of electrostrictive polymers for energy harvesting[J]. Ieee Transactions on Ultrasonics Ferroelectrics and Frequency Control. 2005, 52:2411-2417. |
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5. Zhang S J, Zhang N, Huang C, et al. Microstructure and Electromechanical Properties of Carbon Nanotube/ Poly(vinylidene fluoride—trifluoroethylene—chlorofluoroethylene) Composites[J]. Advanced Materials, 2005, 17(15): 1897-1901.
DOI:10.1002/adma.200500313. |
| 4. Huang C, Ren K, Zhang S J, et al. High dielectric constant polymer nano-composites actuator materials[J]. Ing nierie Des Syst mes D'information, 2005: 91-94. |
| 3. Ren K, Liu Y, Hofmann H F, et al. An Investigation of Energy Harvesting Using Electrostrictive Polymers[J]. MRS Proceedings, 2005. |
| 2. Zhang S.H., Huang C., Ren K.L., et al. Dynamics in relaxor ferroelectric polymers. 2004 14th IEEE international Symposium on Application of Ferroelectrics-ISAF-04, 2004:138-142. |
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1. Liu Y, Ren K, Hofmann H F, et al. Electrostrictive polymers for mechanical energy harvesting[J]. Proceedings of SPIE, 2004, 5385(1): 17-28.
DOI:10.1117/12.547133. |
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