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Low-cost, easy-to-deploy and self-driven flexible electronic devices and flexible sensors will bring new opportunities for developing the internet of things, wearable, and implantable technologies, especially human health monitoring, tactile perception and intelligent robot electronic skin. Therefore, it is necessary to provide high-performance and continuous energy supply modules for flexible electronic devices and flexible sensors. Nanogenerator can achieve high-performance sensing and energy storage characteristics by regulating the polarization electric field at the interface and surface, which is indeed an ideal adaptation choice. In particular, flexible piezoelectric nanogenerator can convert mechanical energy into electrical energy by piezoelectric properties, and can be applied to various deformation conditions such as bending, stretching and compression, which provides a novel solution to the problems of limited energy supply and insufficient performance in flexible electronic and self-driven technology. The piezoelectric output response of piezoelectric nanogenerator can be used not only as an energy signal to self-drive flexible electronic devices, but also as a sensing signal that can be integrated into the self-driven flexible sensors such as gas sensor, pressure sensor and biological sensor. Predictably, self-powered gas sensor with energy harvesting and high-sensitivity sensing, and self-charging power cell with energy harvesting and efficient storage will become hot topics. In this paper, we review the recent developments of flexible piezoelectric nanogenerators in flexible sensors and energy storage devices.
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图 2 ZnO NWs-PENG基自驱动气体传感器的(a) 结构示意图和 (b) 处于不同气体环境中的压电输出响应[22]; PANI/PTFE/PANI三明治纳米结构型嗅觉电子皮肤的 (c) 结构示意图和 (d) 在不同乙醇气体浓度下的输出电压[28]
Fig. 2. (a) Schematic and (b) piezoelectric output response in different gas environments of ZnO NWs-PENG based self-driven gas sensor[22]; (c) schematic and (d) output voltage at different concentrations of ethanol gas of olfactory electronic skin based on PANI/ PTFE/PANI sandwich nanostructure[28].
图 4 基于柔性PENG的自驱动压力传感器 (a) 基于OPNG的重量测量传感器能够成功区分出不同体重的实验者[37]; (b) 基于OPNG的振动传感器在不同应用场景下的输出响应[37]; (c) 基于P(VDF-TrFE) 纳米线阵列的自供电柔性压力传感器用于声波检测[43]; (d) 基于P(VDF-TrFE)/钛酸钡 (BaTiO3) 压电增强纳米复合微柱阵列的声压传感器用于监测声压变化[44]
Fig. 4. Self-driven pressure sensors based on flexible PENG: (a) The weight sensor based on the OPNG can distinguish the subjects with different weights[37]; (b) the output response of vibration sensor based on the OPNG in different application conditions[37]; (c) self-powered flexible pressure sensor based on P(VDF-TrFE) nanowire arrays can be used for acoustic detection[43]; (d) sound pressure sensor based on P(VDF-TrFE)/BaTiO3 piezoelectric reinforced nanocomposite microcolumn arrays can be used to monitor sound pressure changes[44].
图 5-3 基于柔性PENG的自驱动生物传感器被用于监测(a) 手指肌肉运动状态、呼吸、心跳脉冲以及低强度声波[43], (b) 深呼吸、喘气、呼吸困难以及正常呼吸这四种不同的呼吸模式[44], (c) 眨眼、发声、手臂弯曲、桡动脉脉搏跳动/心脏跳动等人体生理活动[54]
Fig. 5-3. Self-driven biosensors based on flexible PENG are used to monitor (a) finger muscle movement, breathing, heartbeat pulses, and low-intensity sound waves[43], (b) four different breathing modes: deep breathing, gasping, dyspnea, and normal breathing[44], (c) human physiological activities such as blinking, vocalization, arm bending, radial artery pulse / heart beating, etc[54].
图 6 基于柔性PENG的电子皮肤 (生物) 传感器[59] (a)—(c) 基于NiO @ SiO2/PVDF纳米复合膜的电子皮肤触觉传感器[57]; (d) 用于体液中葡萄糖水平检测的基于压电-酶反应耦合过程的自供电电子皮肤[11]
Fig. 6. E-skin (biological) sensors based on flexible PENG: (a)–(c) E-skin tactile sensor based on NiO@SiO2/PVDF nanocomposite film[57]; (d) self-powered E-skin based on the coupled process of piezoelectric-enzyme reaction can be used to detect glucose levels in body fluids[11].
图 7 采用“三明治”结构的内部集成式自充电能源包 (a) 基于PVDF纳米薄膜的一体式自充电能源包[9]; (b) 基于PVDF-石墨烯纳米片的柔性自充电能源包[66]; (c) 基于CuO / PVDF纳米复合薄膜的自充电能源包[67]; (d) 基于PVDF-PZT纳米复合薄膜的自充电能源包[68]; (e) 介孔PVDF纳米薄膜作为自充电能源包的压电分离器[69]; (f) 基于介孔PVDF-LiPF6膜的全固态柔性自充电能源包[70]
Fig. 7. Internal integrated SCPC with "sandwich" structure: (a) An integrated SCPC based on PVDF nano-film[9]; (b) flexible SCPC based on PVDF-graphene nanosheets[66]; (c) CuO / PVDF nanocomposite film based novel SCPC[67]; (d) SCPC based on PVDF-PZT nanocomposite film[68]; (e) mesoporous PVDF nano-film can be used as piezoelectric separator of SCPC[69]; (f) all-solid-state flexible SCPC based on mesoporous PVDF-LiPF6 film[70].
图 8 多孔PVDF纳米薄膜基自充电能源包的微观电化学过程[69] (a) 在初始阶段, 电解质中的锂离子浓度处于动态平衡; (b) 当外力F施加到SCPC上时, 压电材料产生形变, 自充电能源包内部产生电势差; (c) 压电电场驱动Li+ 和电子在电极之间进行传导, 促进电极发生氧化还原反应; (d) 自充电能源包的内部再次逐渐达到动态平衡; (e) 当释放外力F时, Li+和电子反向传导; (f) 自充电能源包的内部趋于稳定并最终达到动态平衡状态
Fig. 8. Microscopic electrochemical process of porous PVDF nano-film based SCPC[69]: (a) In the initial stage, the lithium ion concentration in the electrolyte is in dynamic equilibrium; (b) when the external force F is applied to SCPC, the piezoelectric material deforms and a potential difference is generated inside the SCPC; (c) the piezoelectric electric field drives Li+ and electrons to conduct between the electrodes, promoting the electrode to undergo REDOX reaction; (d) the interior of SCPC gradually reaches dynamic equilibrium again; (e) when the external force F is released, Li+ and electrons conduct in reverse; (f) the interior of SCPC tends to be stable and eventually reaches a dynamic equilibrium state.
表 1 柔性PENG-自驱动气体传感器与非自驱动MOS气体传感器的性能比较 (1 ppm = 1 mg/L)
Table 1. Comparison of different flexible PENGs-based self-driven gas sensors and MOS-based non-self-driven gas sensors (1 ppm = 1 mg/L).
组分材料 选择性 灵敏度 响应特性 工作条件 检测极限 检测范围 Au/SnO2厚膜
(非自驱动)[17]CO 电阻比30.2 (4000 ppm, 210 ℃) 响应时间8 s, 复原时间6 s (500 ppm, 210 ℃) 83—210 ℃ N/A 100—4000 ppm SnO2-CuO多层结构 (非自驱动)[18] H2S 电阻比2.7 × 104 (20 ppm) 响应时间2 s 140 ℃ N/A 2—20 ppm p型CuO颗粒/n型SnO2纳米线异质结构 (非自驱动)[19] H2S 电导比3250 (2 ppm) 响应时间2 min,
复原时间10 min250 ℃ N/A 1—10 ppm 氧化铜功能化SnO2-ZnO核壳纳米线
(非自驱动)[20]H2S 约75% (12.5 ppm, 5 V, 50 ℃) N/A 室温 (材料的自热效应提供能量) N/A N/A 单壁碳纳米管
(非自驱动)[21]H2S 71.91% (40 mV) 1.53—0.89 μA 能量窗口介于
$ \pm $0.02 eVN/A N/A ZnO纳米线[22] O2; H2S;
水蒸气35.7%; 28.6%; 127.3% 0.7; 0.198; 0.35 V
压电输出室温 100 ppm (H2S) 100—1000 ppm (H2S) NiO/ZnO异质结
纳米线阵列[23]H2S 536% (1000 ppm) 0.388 V (0 ppm)—0.061 V (1000 ppm) 室温 10—30 ppm 0—1000 ppm ZnSnO3/ZnO
纳米线[24]液化石油气 498.9% (8000 ppm) 0.533 V (0 ppm)—0.089 V (8000 ppm) 室温 600 ppm 1000—8000 ppm SnO2/ZnO纳米阵列[25] H2 471.4% (800 ppm) 0.80 V (0 ppm)—
0.14 V (800 ppm)室温, 可由手指
弯曲驱动10 ppm 0—800 ppm CuO/ZnO PN结
纳米阵列[26]H2S 约629.8% (800 ppm) 0.738 V (0 ppm)—
0.101 V (800 ppm);
响应时间250 s (200 ppm)室温 N/A 0—800 ppm CdS纳米棒阵列[27] H2S 166.7% (600 ppm) 0.32 V (0 ppm)—
0.12 V (600 ppm)室温, 可由手指
按压驱动N/A 0—600 ppm PANI/PTFE/PANI三明治纳米结构[28] 乙醇 66.8% (210 ppm) 响应时间 < 20 s,
复原时间 < 25 s室温 30 ppm 0—210 ppm 表 2 柔性外壳基板材料汇总
Table 2. Summary of flexible substrate materials in SCPC.
表 3 柔性电极材料汇总
Table 3. Summary of flexible electrode materials in SCPC.
组分名称 主要功能 材料举例 电池电极 为电极的氧化还原反应提供反应场所和反应物质 Cu[32,66,70,71,73,78,80,92,98,99,101]; Al[11,23,25,33,41,66,70,73,79,85,95,97,102-105]; LiCoO2[66,70]; 石墨[57,58,70,81,86];
石墨烯[66]; ITO[48,61,72,90,95,96,106]; Au[29,40,43,44,50,74-76,82-84,87,96,97,103,107-109]; Cr[40,74,75,107];
Ag[49,54,94,100,107,110]; 碳纳米管[44,82,91]; Ti[11,23,25,55]; Ni[33,93]; MnO2 [111]表 4 柔性压电核心材料汇总
Table 4. Summary of flexible piezoelectric materials in SCPC.
组分名称 主要功能 材料举例 压电
分离层压电效应; 为离子传导提供动力等 ZnO纳米线/棒[11,40,55,80,97,100,109]; (介孔) PVDF纳米薄膜[8,37,66,70,73,79,87,110];
PVDF-ZnO复合薄膜[50,74,75,81,103,111]; P(VDF-TrFE)复合薄膜[43,44,61,76,78,82,83,86,89,91,92,94-96,107,108];
PVDF-BaTiO3复合薄膜[10,44,90]; PVDF-BiVO4复合薄膜[88]; PVDF-KNN复合薄膜[102,104];
PVDF-rGO-Ag复合薄膜[85]; PVDF-ZrO2复合薄膜[98]; PVDF-NiO-SiO2复合薄膜[57];
ZnPc纳米棒[105]; 单层MoS2薄片[29]表 5 部分柔性SCPC的组分材料和输出性能举例
Table 5. Examples of component materials and output properties of flexible SCPC.
组分材料 电解质类型 峰值输出电压/电流 能量存储容量/μA·h 稳定性 主要特性 PVDF薄膜/ LiCoO2-TiO2
电极/ Al-Ti基板[9]液态LiPF6 327—395 mV
(2.3 Hz, 45 N)约0.036 约8000周期 PVDF-SCPC的雏形 PVDF纳米薄膜/LiCoO2-
石墨烯电极/ Al-Cu箔-
聚酰亚胺基板[66]液态LiPF6 500—850 mV
(1.0 Hz, 34 N,
弯曲角度${10^ \circ }$)约0.266 约450 min 石墨烯电极和聚酰
亚胺基板被首次应
用于柔性SCPC介孔PVDF薄膜/ LiCoO2-
石墨电极/ Al-Cu基板[70]固态LiPF6 25—473 mV
(1.0 Hz, 30 N)约0.118 约160 min 全固态可
弯折SCPCPVDF-PZT纳米复合薄
膜/LiCoO2-多壁碳纳米管电极/Al-Cu基板[68]液态LiPF6 210—297.6 mV
(1.5 Hz, 10 N)约0.010 N/A PZT具有较高
的压电势系数
(500—600 pC/N)定向P(VDF-TrFE) 纳米纤维/平行Cu电极/PI基板[78] N/A 12 V, 150 nA
(1.6 Hz, 2 kPa)N/A N/A 高β晶相含量 PVDF-ZnO纳米复合薄膜/Al-Au电极/PTFE基板[103] N/A 约600 mV
(6.0 Hz, 21 N)N/A N/A ZnO和PVDF材料的极
化方向相同, 杂化结构
具有协同的压电特性 -
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