Investigated a PLL surface-modified Nylon 11 electrospun as a highly tribo-positive frictional layer to enhance output performance of triboelectric nanogenerators and self-powered wearable sensors

Prasad, Gajula; Graham, Sontyana Adonijah; Yu, Jae Su; Kim, Hong Doo; Lee, Dong‐Weon

doi:10.1016/j.nanoen.2023.108178

Cited by 64 publications

(55 citation statements)

References 54 publications

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“…The working mechanism of the device without a spacer is slightly different from that of the spacer one, and a similar kind of mechanism is reported in our previous work . Here, the triboelectric materials partly meet with each other before applying external pressure, as shown in Figure i original state.…”

Section: Methodssupporting

confidence: 53%

“…The working mechanism of the device without a spacer is slightly different from that of the spacer one, and a similar kind of mechanism is reported in our previous work. 42 Here, the triboelectric materials partly meet with each other before applying external pressure, as shown in Figure 1i original state. Even though they are partly in contact with the tribo materials, there exists a tiny space in between them (due to the roughness of ECF and uneven surface morphology of TPUnw).…”

Section: Working Mechanism For the Sample Without A Spacermentioning

confidence: 96%

“…Once the surface charge increases on the contact films, the corresponding output performance also increases. However, a few techniques such as chemical etching, 3D printings, inductive plasma etching, soft lithography, , and templet-based drop-casting are reported to enhance the surface roughness. Among them, the templet-based drop-casting technique is easy and cost-effective and can be scalable compared to other techniques.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a Silicon Elastomer-Based Self-Powered Flexible Triboelectric Sensor for Wearable Energy Harvesting and Biomedical Applications

Prasad

Muhammad

Reza

et al. 2023

ACS Appl. Electron. Mater.

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Nowadays, flexible triboelectric sensors are the most promising candidates for wearable energy harvesting and medical applications. In the present investigation, the self-powered flexible triboelectric sensors (SF-TESs) were fabricated by using roughness-created Ecoflex cast film and melt-blown nonwoven polyurethane layers. SF-TESs were prepared using sandpaper (60 grit size) as a substrate, showing better triboelectric performance due to high surface roughness and low density compared to others, and it is an optimum condition. The optimized SF-TES can scavenge a maximum open-circuit output voltage (V OC) and power density values for the sensor without and with a spacer were 139 V and 1.6 Wm–2 and 320 V and 6 Wm–2, respectively. The spacer sample showed 2.3 times higher V OC and 3.7 times higher power density values than without a spacer at a constant load of 4.4 N and a frequency of 5 Hz. The SF-TES can directly operate 15 light-emitting diodes (LEDs) and switch on an LCD timer, and it is powered for 5 s when connected through a rectifier and a capacitor. In contrast, the sensor with a spacer can operate more than 100 LEDs directly. Further, the triboelectric output performances V OC and short-circuit current (I SC) gradually increase from 65 to 139 V and 2.3 to 4.6 μA, respectively, when the external load increases from 2.2 to 8.8 N. Based on the above results, we can clearly say that the surface roughness, spacing between the frictional layers, and external load are critical parameters for enhancing the triboelectric performance. The as-prepared SF-TESs have potential medical applications in the intelligent beds for observing the physical activity of coma patients, patients suffering from cardiovascular diseases, and sleep apnea.

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Section: Methodssupporting

confidence: 53%

Section: Working Mechanism For the Sample Without A Spacermentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Fabrication of a Silicon Elastomer-Based Self-Powered Flexible Triboelectric Sensor for Wearable Energy Harvesting and Biomedical Applications

Prasad

Muhammad

Reza

et al. 2023

ACS Appl. Electron. Mater.

Self Cite

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“…Zheng et al. [ 103 ] used a simple spraying approach to sequentially spray PEDOT films and MXene nanosheets onto cotton fabrics (Figure 6c), which exhibited excellent electrochemical properties, good electromagnetic interference (EMI) shielding, and strain‐sensing properties. It is typically necessary to convert fabrics into sensitive conductors because fabrics by themselves are typically nonconductive and cannot be used to create flexible electronics.…”

Section: Substrate Materials For Flexible Sensorsmentioning

confidence: 99%

“…The existing fiber mate-rials used to spin clothing, such as cotton textiles, [99] aramid, [100] spandex, [101] and nylon, [102] are attractive candidates for substrate materials because of their wide range of applications and demonstrated safety in everyday usage (Table 2). Zheng et al [103] used a simple spraying approach to sequentially spray PEDOT films and MXene nanosheets onto cotton fabrics (Figure 6c), which exhibited excellent electrochemical properties, good electromagnetic interference (EMI) shielding, and strain-sensing properties. It is typically necessary to convert fabrics into sensitive conductors because fabrics by themselves are typically nonconductive and cannot be used to create flexible electronics.…”

Section: Fabricsmentioning

confidence: 99%

MXene‐Based Flexible Sensors: Materials, Preparation, and Applications

Han

Yan

et al. 2023

Adv Materials Technologies

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The rational design and applications of MXene-based materials have yielded remarkable progress in flexible sensors, including wearable devices, soft robots, and smart medical equipment. The emerging MXene and substrate materials can be precisely engineered to improve the mechanical properties and sensing sensitivity of the sensors, opening up a wider range of application possibilities for MXene-based sensors. Therefore, a systematic and comprehensive review summarizing the progress of MXene-based sensor research based on these backgrounds is necessary. First, we discuss the basic structure of MXene materials and introduce the flexible substrate materials for MXene-based flexible sensors in detail. Then, we also discuss the different preparation methods of MXene-based sensors, describe the classifications, and highlight the applications of MXene-based flexible sensors in various scenarios. Finally, we identify the challenges that need to be overcome to accelerate the development of MXene-based materials in flexible sensing. This review provides a comprehensive and systematic insight into MXene-based flexible sensors and it is expected that this review will contribute to the development of higher performance MXene-based flexible sensors.

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Niobium‐Doped Bismuth Titanate‐Loaded PVDF‐HFP Flexible Composite Films for Self‐Powered Stair Sensing and Emergency Alert Applications via Hybrid Mechanical Energy Harvesters

Manchi,

Paranjape,

Graham

et al. 2024

Adv Funct Materials

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With the rise of demand for smart wearable and flexible electronic devices in the modern world, high‐performance hybrid mechanical energy harvesters (HMEHs), which can easily convert biomechanical energy into electricity for powering a variety of portable electronic gadgets and operating smart sensors, have gained extensive interest. Herein, propose piezo/ferroelectric and dielectric niobium (Nb)‐doped bismuth titanate (Bi4Ti3‐xNbxO12, NBTO) plates, are proposed and synthesized by a molten‐salt synthesis technique, and they are further embedded into the poly(vinylidene fluoride‐co‐hexafluoropropylene) (NBTO/PVDF‐HFP) flexible composite film (CF) to construct a flexible HMEH. The prepared NBTO/PVDF‐HFP CFs reveal good piezo/ferroelectricity, β‐phase fraction, and dielectric properties, which can improve the electrical output performance of the HMEH. The 2 wt.% NBTO/PVDF‐HFP CF‐based HMEH exhibits high and stable electrical performance of ≈175 V, ≈5.8 µA, ≈76 µC m−2, and ≈2.02 W m−2, respectively. Furthermore, the durability and mechanical robustness analysis of the HMEH is conducted for several days. The real‐time applications of the HMEH are demonstrated by harvesting the biomechanical energy obtained from daily human activities and powering various portable electronics. Also, the HMEH integrated with an Arduino microcontroller unit is employed as a smart sensor switch for implementing smart home/building stair‐sensing applications and sending emergency e‐mail alerts.

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Investigated a PLL surface-modified Nylon 11 electrospun as a highly tribo-positive frictional layer to enhance output performance of triboelectric nanogenerators and self-powered wearable sensors

Cited by 64 publications

References 54 publications

Fabrication of a Silicon Elastomer-Based Self-Powered Flexible Triboelectric Sensor for Wearable Energy Harvesting and Biomedical Applications

Fabrication of a Silicon Elastomer-Based Self-Powered Flexible Triboelectric Sensor for Wearable Energy Harvesting and Biomedical Applications

MXene‐Based Flexible Sensors: Materials, Preparation, and Applications

Niobium‐Doped Bismuth Titanate‐Loaded PVDF‐HFP Flexible Composite Films for Self‐Powered Stair Sensing and Emergency Alert Applications via Hybrid Mechanical Energy Harvesters

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