High sensitivity wrist-worn pulse active sensor made from tellurium dioxide microwires

Wu, Jyh Ming; Lee, Chia Chia; Lin, Ying Hong

doi:10.1016/j.nanoen.2015.02.009

Cited by 37 publications

(14 citation statements)

References 34 publications

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“…The theoretical calculation had the NWs at a diameter and length of 40 and 500 nm, respectively; the elastic constants of ZnSnO 3 for C 11 , C 12 , C 13 , C 15 , C 33 , C 44 , and C 66 at 194, 63, 101, 0.1, 169, 117, and 92 GPa, respectively; and the piezoelectric stress constants of e 11 , e 15 , e 31 , and e 33 at −0.15, 0.26, 1.23, and 0.29 cm −2 , respectively. [17,18,31] Figure 3a-f displays the X-ray photoelectron spectroscopy (XPS) spectra for the annealments of different durations (from 0 to 5 h). Moreover, owing to the ionic charge resulting from the NSC structure, the generation of the piezopotential is proportional to the pressure applied on the NW (Figure 2e, at the fixed end of NW).…”

Section: Resultsmentioning

confidence: 99%

Effect of Controlled Oxygen Vacancy on H₂‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO₃ Nanowires

Wang

2019

Adv Funct Materials

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170

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This study is the first to demonstrate that ferroelectric R3c LiNbO 3 -type ZnSnO 3 nanowires (NWs), through the piezocatalysis and piezophototronic process, demonstrate a highly efficient hydrogen evolution reaction (HER). The polarization and electric field curves indicate that ZnSnO 3 NWs exhibit typical ferroelectric hysteresis loops. Time-resolved photoluminescence spectra reveal that the relaxation time increases with the increasing concentration of oxygen vacancies. Moderated 3H-ZnSnO 3 NWs (thermally annealed for 3 h in a hydrogen environment) have the longest extended carrier lifetime of approximately 8.3 ns. The piezoelectricity-induced HER, via the piezocatalysis process (without light irradiation), reaches an optimal H 2 -production rate of approximately 3453.1 µmol g −1 h −1 . Through the synergistic piezophototronic process, the HER reaches approximately 6000 µmol g −1 in 7 h. Crucially, the mechanical force-induced spontaneous polarization functions as a carrier separator, driving the electron and hole in opposite directions in ferroelectric ZnSnO 3 NWs; this separation reduces the recombination rate, enhancing the redox process. This theoretical analysis indicates that the photo catalytic and piezocatalytic effects can synergistically enhance piezophototronic performance through capitalizing on well-modulated oxygen vacancies in ferroelectric semiconductors. This study demonstrates the essential role of this synergy in purifying water pollutants and converting water into hydrogen gas through the piezophototronic process.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201907619. high greenhouse gas emissions, and high energy consumption. Scientists today, being more ecologically conscious, have devised strategies that reduce these negative environmental consequences. Specifically, they have developed catalyst materials that play pivotal roles in the degradation of hazardous pollutants, [1] water splitting, [1][2][3] and energy source conversion. In particular, electrocatalysis [4] and photocatalysis [5] are promising processes for converting solar energy into chemical energy through the irradiation of sunlight. However, challenges remain with respect to improving photoelectrochemical conversion efficiency through doping metal transitions, cocatalysts, [6,7] heterojunction structures, [8,9] and defects states. [10] A sustained effort should be made to accelerate the process of catalyst development using a variety of methods. There has been much recent attention devoted to piezocatalysts, [11][12][13][14] such as MoS 2 , MoSe 2 , and WS 2 , which are made of few-layered 2D materials with unique piezoelectric properties. Specifically, these piezocatalysts have been discovered to have ultrahigh efficiency and to require no light irradiation to convert mechanical energy into chemical energy. [15] Bear this in mind, mechanical energy is naturally available anytime and anywhere. These discoveries have enabled broad engineering applicatio...

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Section: Resultsmentioning

confidence: 99%

Effect of Controlled Oxygen Vacancy on H₂‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO₃ Nanowires

Wang

2019

Adv Funct Materials

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170

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“…A hybrid system is then required as a compensation, and the use of a piezoelectric element as a sensor has been studied extensively in the detection of diversified signals, such as force, and chemicals etc . − and shows promising features as a TENG where both can transform mechanical input, i.e. , the mechanical energy, into electrical output, i.e.…”

mentioning

confidence: 99%

Self-Powered and Self-Functional Cotton Sock Using Piezoelectric and Triboelectric Hybrid Mechanism for Healthcare and Sports Monitoring

et al. 2019

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Wearable devices rely on hybrid mechanisms that possess the advantages of establishing a smarter system for healthcare, sports monitoring, and smart home applications. Socks with sensing capabilities can reveal more direct sensory information on the body for longer duration in daily life. However, the limitation of suitable materials for smart textile makes the development of multifunctional socks a major challenge. In this paper, we have developed a self-powered and self-functional sock (S2-sock) to realize diversified functions including energy harvesting and sensing various physiological signals, i.e., gait, contact force, sweat level, etc., by hybrid integrating poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS)-coated fabric triboelectric nanogenerator (TENG) and lead zirconate titanate (PZT) piezoelectric chips. An output power of 1.71 mW is collected from a PEDOT:PSS-coated sock with mild jumping at 2 Hz and load resistance of 59.7 MΩ. The study shows that cotton socks worn daily can potentially be a power source for enabling self-sustained socks comprising wireless transmission modules and integrated circuits in the future. We also investigate the influences of environmental humidity, temperature, and weight variations and verify that our S2-sock can successfully achieve walking pattern recognition and motion tracking for smart home applications. On the basis of the sensor fusion concept, the outputs from TENG and PZT sensors under exercise activities are effectively merged together for quick detection of the sweat level. By leveraging the hybrid S2-sock, we can achieve more functionality in the applications of foot-based energy harvesting and monitoring the diversified physiological signals for healthcare, smart homes, etc.

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“…However, in PZT, both toxic and heavy metals such as lead (Pb) account for more than 60% of the total weight, which causes environmental problems and concerns about safety for humans . This problem, however, can be addressed by using ZnO, ZnSnO 3 , , barium titanate (BaTiO 3 ), − TeO 2 , and potassium sodium niobate (KNN), among others.…”

Section: Suitable Flexible Materialsmentioning

confidence: 99%

Recent Progress of Wearable Piezoelectric Nanogenerators

Zhang

Fan

Wang

et al. 2021

ACS Appl. Electron. Mater.

114

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Considering the limited supply of fossil fuel, pollution, problems with chemical batteries, and the many potential applications of wearable electronics, the development of more effective lightweight energy sources is important. Piezoelectric nanogenerators (PENGs) can convert a mechanical energy into an electric energy and sometimes may even have the potential to replace conventional chemical batteries. The combination of conventional textiles with PENGs leads to so-called "smart textiles", in other words, textile-based PENGs. More generally, textile-based PENGs can endow conventional textiles with special functionalities such as energy conversion and online health testing (using sensors), while the used conventional textiles can provide platforms for their deployment. This paper reviews the research progress of textile-based PENGs, discusses the classification of piezoelectric materials and electrode materials, and summarizes ways to improve their piezoelectric performance. In addition, several preparation methods of different device structures of textile-based PENGs are compared. Finally, the most important obstacles for the application of textile-based PENGs are addressed at the end of this paper. This compact but relatively comprehensive review will not only aid researchers to better understand textile-based PENGs but also attract the attention of related fields and perhaps inspire more exciting research and progress of wearable textile-based PENGs.

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High sensitivity wrist-worn pulse active sensor made from tellurium dioxide microwires

Cited by 37 publications

References 34 publications

Effect of Controlled Oxygen Vacancy on H₂‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO₃ Nanowires

Effect of Controlled Oxygen Vacancy on H₂‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO₃ Nanowires

Self-Powered and Self-Functional Cotton Sock Using Piezoelectric and Triboelectric Hybrid Mechanism for Healthcare and Sports Monitoring

Recent Progress of Wearable Piezoelectric Nanogenerators

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High sensitivity wrist-worn pulse active sensor made from tellurium dioxide microwires

Cited by 37 publications

References 34 publications

Effect of Controlled Oxygen Vacancy on H2‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO3 Nanowires

Effect of Controlled Oxygen Vacancy on H2‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO3 Nanowires

Self-Powered and Self-Functional Cotton Sock Using Piezoelectric and Triboelectric Hybrid Mechanism for Healthcare and Sports Monitoring

Recent Progress of Wearable Piezoelectric Nanogenerators

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Effect of Controlled Oxygen Vacancy on H₂‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO₃ Nanowires

Effect of Controlled Oxygen Vacancy on H₂‐Production through the Piezocatalysis and Piezophototronics of Ferroelectric R3C ZnSnO₃ Nanowires