Enhanced piezocapacitive response in zinc oxide tetrapod–poly(dimethylsiloxane) composite dielectric layer for flexible and ultrasensitive pressure sensor

Hsieh, Gen-Wen; Ling, Shih Rong; Hung, Fan Ting; Kao, Pei Hsiu; Liu, Jian Bin

doi:10.1039/d0nr06743a

Cited by 25 publications

(23 citation statements)

References 59 publications

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“…PDMS is an elastic matrix with biocompatibility, excellent flexibility and chemical stability, which is used as the substrate of the tactile sensor in this work. [20][21][22] Introduction of structured surface on active layer and/or flexible elastomeric substrate has been proven highly effective to fabricate a successful electronic skin device, providing higher sensitivity and faster response speed than non-microstructured electronic skin. [23] In this work, reef leaf with rich multiscale structure was used as the solid molds to template the substrate for attachment of active layer, i.e., PDMS membrane.…”

Section: Resultsmentioning

confidence: 99%

A Multifunctional Biomimetic Flexible Sensor Based Novel Artificial Tactile Neuron with Perceptual Memory

Xia

Qin

Zheng

et al. 2021

Adv Materials Inter

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to provide us with awareness and guidance. [1] Biological systems inherently run on a distributed computing paradigm with superior fault tolerance and power efficiency inherent to adaptive, plastic and event-driven sensory neuron networks. [2,3] Thus, emulating biological behavior from sensory neurons is a fundamental implementation of bio-sensory capabilities. [4] There are three key components in the biologic sensory system containing receptor cells, nerve channels and sensory-related parts of the brain, as shown in Figure 1. The biologic tactile nervous system is one of the ways in which external information is acquired. Skin (sensory receptor) perceive external stimuli and presynaptic neurons generate action potentials to release neurotransmitters that trigger postsynaptic neurons, and the electrical signal then propagates along the afferent neurons to the somatosensory cortex. [5] Accordingly, the artificial sensory memory (ASM) device also should contain three core components (see Figure 1b): the E-skin (artificial receptor) to convert external physical stimuli into electrical signal pulses, the artificial synapse to integrate the signals and convert signals into excitatory postsynaptic current (EPSC), and the artificial axon to connect them.Recently, there appears some significant breakthroughs in combining advanced bio-inspired sensing and neuromorphic engineering technologies. [6][7][8][9][10] In particular, different neuromorphic systems based on field-effect transistor (FET)based synaptic devices have been developed for tactile simulation. [3,11,12] For example, Zhu et al. used piezoresistive sensors to convert pressure stimuli into electrical signals, which were transmitted to indium-tungsten-oxide synaptic transistors through soft ion conductors; the system can integrate and extract tactile pattern features for pattern recognition. [13] Wan et al. proposed a bio-inspired energy-saving tactile sensor by combining the triboelectric nanogenerator and IZGO-based synaptic transistor compatible. [11] Triboelectric nanogenerator converts dynamic pressure pulse into gate voltage pulse to adjust the channel conduction of synaptic transistor. However, with the development of integrated circuit miniaturization technology, transistor cannot effectively retain electrons and store information. Recently, the emerging nanoelectronics synaptic devices are drawing more attention due to their superior properties.The bio-inspired sensory memory device functions as a multifunctional artificial perceptual learning system that can effectively analyze and retain multiple sensory signals. In this work, the multiscale hierarchical surface of reed leaves is templated to prepare CNTs/PDMS films, and a new type of electronic skin (E-skin) is constructed. Due to its unique multi-scale sensing layer surface, E-skin exhibits a wide pressure detection range and ultrahigh sensitivity (235.95 kPa −1 ) and linearity (0.99 under 1.95-12.4 kPa). The memristor serving as artificial synapse is formed with HfO 2 film as resistive switch lay...

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Section: Resultsmentioning

confidence: 99%

A Multifunctional Biomimetic Flexible Sensor Based Novel Artificial Tactile Neuron with Perceptual Memory

Xia

Qin

Zheng

et al. 2021

Adv Materials Inter

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“…The flower-like structures exhibit more crystals in this direction due to the spatial distribution of their geometry compared to nanoparticles. In addition, several studies have reported that ZnO nanostructures such as nanoflowers and tetrapods are more susceptible to larger deformations (bending) under compressive force due to their high aspect ratio with respect to nanoparticles [ 10 , 24 , 32 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…The integration of ZnO fillers into PDMS has been reported to generate a piezoelectric response, being biocompatible and also environmentally friendly, making them non-toxic and safe to be disposed of in a landfill after use [ 3 , 19 , 20 , 21 , 22 ]. Among the ZnO nanomaterials, nanoparticles and nanowires have been commonly used in nanocomposites but fewer studies have used other types of nanostructures [ 14 , 23 , 24 ]. 3D nanostructures such as ZnO NFs have been found to enhance light harvesting, photocatalytic performance and antibacterial activity; this is due to their high surface area to volume ratio, surface-reaction efficiency and better charge transfer and carrier immobility [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Another study reported that there is a direct correlation between filler concentration and output voltage obtaining the highest output voltage of 23 V when subjected to a load resistance of 10 MΩ at 7.4% wt concentration of ZnO nanoparticles into PDMS ranging from 2% wt to 9.1% wt concentrations [ 8 ]. Recently, a composite film of PDMS and ZnO tetrapods was reported to be potentially used as piezocapacitive pressure sensor with a sensitivity of 2.55 kPa −1 [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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PDMS-ZnO Piezoelectric Nanocomposites for Pressure Sensors

Jeronimo

Koutsos

Cheung

et al. 2021

Sensors

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The addition of piezoelectric zinc oxide (ZnO) fillers into a flexible polymer matrix has emerged as potential piezocomposite materials that can be used for applications such as energy harvesters and pressure sensors. A simple approach for the fabrication of PDMS-ZnO piezoelectric nanocomposites based on two ZnO fillers: nanoparticles (NP) and nanoflowers (NF) is presented in this paper. The effect of the ZnO fillers’ geometry and size on the thermal, mechanical and piezoelectric properties is discussed. The sensors were fabricated in a sandwich-like structure using aluminium (Al) thin films as top and bottom electrodes. Piezocomposites at a concentration of 10% w/w showed good flexibility, generating a piezoelectric response under compression force. The NF piezocomposites showed the highest piezoelectric response compared to the NP piezocomposites due to their geometric connectivity. The piezoelectric compound NF generated 4.2 V while the NP generated 1.86 V under around 36 kPa pressure. The data also show that the generated voltage increases with increasing applied force regardless of the type of filler.

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“…Unlike conventional composites or a sole type of material, polymer-based nanocomposites may offer considerable enhancement in thermal, electrical, optical, chemical, or mechanical properties. Among them, a variety of nanostructures with highly conductive [14][15][16], dielectric [17][18][19], piezoelectric [20][21][22], triboelectric [23][24][25], photo-responsive [26][27][28], or stress-sensitive [10,[29][30][31] properties have been studied for flexible pressure sensors because of their potential in amplifying stress/strain sensing capability for human motion detection, health diagnosis, and electronic skin.…”

Section: Introductionmentioning

confidence: 99%

Porous Polydimethylsiloxane Elastomer Hybrid with Zinc Oxide Nanowire for Wearable, Wide-Range, and Low Detection Limit Capacitive Pressure Sensor

2022

Self Cite

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We propose a flexible capacitive pressure sensor that utilizes porous polydimethylsiloxane elastomer with zinc oxide nanowire as nanocomposite dielectric layer via a simple porogen-assisted process. With the incorporation of nanowires into the porous elastomer, our capacitive pressure sensor is not only highly responsive to subtle stimuli but vigorously so to gentle touch and verbal stimulation from 0 to 50 kPa. The fabricated zinc oxide nanowire–porous polydimethylsiloxane sensor exhibits superior sensitivity of 0.717 kPa−1, 0.360 kPa−1, and 0.200 kPa−1 at the pressure regimes of 0–50 Pa, 50–1000 Pa, and 1000–3000 Pa, respectively, presenting an approximate enhancement by 21−100 times when compared to that of a flat polydimethylsiloxane device. The nanocomposite dielectric layer also reveals an ultralow detection limit of 1.0 Pa, good stability, and durability after 4000 loading–unloading cycles, making it capable of perception of various human motions, such as finger bending, calligraphy writing, throat vibration, and airflow blowing. A proof-of-concept trial in hydrostatic water pressure sensing has been demonstrated with the proposed sensors, which can detect tiny changes in water pressure and may be helpful for underwater sensing research. This work brings out the efficacy of constructing wearable capacitive pressure sensors based on a porous dielectric hybrid with stress-sensitive nanostructures, providing wide prospective applications in wearable electronics, health monitoring, and smart artificial robotics/prosthetics.

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Enhanced piezocapacitive response in zinc oxide tetrapod–poly(dimethylsiloxane) composite dielectric layer for flexible and ultrasensitive pressure sensor

Abstract: We demonstrate polymeric piezocapacitive pressure sensors based on a novel composite dielectric film of poly(dimethylsiloxane) elastomeric silicone with zinc oxide tetrapod. With an appropriate loading of zinc oxide tetrapods, composite...

Cited by 25 publications

References 59 publications

A Multifunctional Biomimetic Flexible Sensor Based Novel Artificial Tactile Neuron with Perceptual Memory

A Multifunctional Biomimetic Flexible Sensor Based Novel Artificial Tactile Neuron with Perceptual Memory

PDMS-ZnO Piezoelectric Nanocomposites for Pressure Sensors

Porous Polydimethylsiloxane Elastomer Hybrid with Zinc Oxide Nanowire for Wearable, Wide-Range, and Low Detection Limit Capacitive Pressure Sensor

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