Flexible Image Sensors with Semiconducting Nanowires for Biomimic Visual Applications

Lou, Zheng; Shen, Guozhen

doi:10.1002/sstr.202000152

Cited by 37 publications

(30 citation statements)

References 129 publications

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“…Owing to the voltage dividing effect, the C p can be charged initially via charging loop because the voltage mainly drops across the FLBP-CsPbBr 3 TSM device (we design the neuron with R OFF > R 1 , where R OFF is the high resistance of FLBP-CsPbBr 3 TSM at the initial state, ~500 TΩ). Once the voltage of C p reaches its threshold, the TSM will be switched from HRS to LRS (R on ~1 kΩ), and the capacitor discharges via discharging loop, inducing the firing of the artificial neuron [57][58][59] .…”

Section: Resultsmentioning

confidence: 99%

Memristor-based biomimetic compound eye for real-time collision detection

et al. 2021

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The lobula giant movement detector (LGMD) is the movement-sensitive, wide-field visual neuron positioned in the third visual neuropile of lobula. LGMD neuron can anticipate collision and trigger avoidance efficiently owing to the earlier occurring firing peak before collision. Vision chips inspired by the LGMD have been successfully implemented in very-large-scale-integration (VLSI) system. However, transistor-based chips and single devices to simulate LGMD neurons make them bulky, energy-inefficient and complicated. The devices with relatively compact structure and simple operation mode to mimic the escape response of LGMD neuron have not been realized yet. Here, the artificial LGMD visual neuron is implemented using light-mediated threshold switching memristor. The non-monotonic response to light flow field originated from the formation and break of Ag conductive filaments is analogue to the escape response of LGMD neuron. Furthermore, robot navigation with obstacle avoidance capability and biomimetic compound eyes with wide field-of-view (FoV) detection capability are demonstrated.

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Section: Resultsmentioning

confidence: 99%

Memristor-based biomimetic compound eye for real-time collision detection

et al. 2021

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“…Wearable tactile sensor with breathable and waterproof property has significant effect in modern social life, which is a goal that people have been striving for. [53][54][55][56][57][58] As exhibited in Figure 3a, pressure sensor based on leaf veins and NF films can be directly attached to the skin. Benefiting by its hierarchical porous structure, when attached to the human skin, the sweat from the human body can be quickly dissipated through the pressure sensor to the surrounding environment.…”

Section: Breathability and Biodegradabilitymentioning

confidence: 99%

Biodegradable, Breathable Leaf Vein‐Based Tactile Sensors with Tunable Sensitivity and Sensing Range

Liu

Tao

Yang

et al. 2021

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natural skin, which has significant applications in wearable health care devices, intelligent robotics, implantable medical devices, and human-machine interfaces. [4][5][6][7] Different sensing mechanisms including capacitance, [8] piezoresistivity, [9] piezoelectricity, [10] and triboelectricity, [11] have mainly been used to convert external stimuli into electronic impulses for quantitative and spatial detection. Among them, piezoresistive effect has been widely used in the design and fabrication of tactile sensor due to the advantages of large detection, simple signal processing, and strong anti-interference capability. [12][13][14][15][16][17][18][19] Novel materials and structure have been applied in the design of high performance tactile sensors in recent researches. A hybrid 3D structure based on ultralight and superelastic MXene/ reduced graphene oxide aerogel is adopted to design a piezoresistive sensor by Yihua Gao etc., which exhibits the sensitivity of 22.56 kPa −1 , and limit detection (10 Pa). [20] Kai Pan's group reported a piezoresisitive pressure sensor based on aPANF/GA aerogel with a 3D interconnected hierarchical microstructure to monitor the real time movement of wrist pulse and main joints of human body. [21] Tactile sensors with high performance containing high sensitivity, wide detection range, fast response, flexibility, and mechanical durability are most concerned in the recent progress of e-skin. [22] Additionally, special functional properties such as self-healing, self-powered, biodegradable, biocompatible, and Resistive pressure sensors have been widely studied for application in flexible wearable devices due to their outstanding pressure-sensitive characteristics. In addition to the outstanding electrical performance, environmental friendliness, breathability, and wearable comfortability also deserve more attention. Here, a biodegradable, breathable multilayer pressure sensor based piezoresistive effect is presented. This pressure sensor is designed with all biodegradable materials, which show excellent biodegradability and breathability with a three-dimensional porous hierarchical structure. Moreover, due to the multilayer structure, the contact area of the pressure sensitive layers is greatly increased and the loading pressure can be distributed to each layer, so the pressure sensor shows excellent pressuresensitive characteristics over a wide pressure sensing range (0.03-11.60 kPa) with a high sensitivity (6.33 kPa −1 ). Furthermore, the sensor is used as a human health monitoring equipment to monitor the human physiological signals and main joint movements, as well as be developed to detect different levels of pressure and further integrated into arrays for pressure imaging and a flexible musical keyboard. Considering the simple manufacturing process, the low cost, and the excellent performance, leaf vein-based pressure sensors provide a good concept for environmentally friendly wearable devices.

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“…The key of designing gel electrolytes with both anti-freezing and anti-drying properties is to weaken the original hydrogen bonds between their water molecules. Polyacrylamide (PAM), which is usually utilized as the polymer matrix of gel electrolytes, often forms strong hydrogen bonds with water molecules due to its abundant amide groups [39][40][41][42]. In addition, as a common cryoprotectant and humectant, Gly can provide a large number of hydroxyl groups for constructing strong hydrogen bonds with water molecules [43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

An anti-freezing and anti-drying multifunctional gel electrolyte for flexible aqueous zinc-ion batteries

et al. 2022

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Aqueous zinc-ion batteries (ZIBs) have attracted immense attention for flexible energy storage devices due to their high safety and low cost. However, conventional flexible aqueous ZIBs will undergo severe capacity loss at subzero temperature due to the inevitably freeze of electrolytes. In addition, under large bending or stretching strains, the encapsulation of devices would be damaged, which causes the evaporation of water in electrolytes and results in device failure. Herein, an anti-freezing and anti-drying gel electrolyte based on polyacrylamide (PAM) and glycerol (Gly) is developed. The strong hydrogen-bonding interactions between PAM or Gly and water molecules not only avoid the crystallization of the gel electrolyte at low temperatures, but also constrain the free water and restrict its evaporation. Therefore, such gel electrolyte displays a high ionic conductivity of 9.65 × 10 −5 S cm −1 at −40°C. Furthermore, it can restrict the dehydration process when the electrolyte is exposed to ambient environment. The flexible ZIBs based on such gel electrolyte exhibit excellent electrochemical performance at −40°C and the devices without encapsulation retain 98% of their initial capacity in ambient condition after 30 days. This work provides a route to design anti-freezing and anti-drying gel electrolytes for aqueous energy storage devices.

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Flexible Image Sensors with Semiconducting Nanowires for Biomimic Visual Applications

Cited by 37 publications

References 129 publications

Memristor-based biomimetic compound eye for real-time collision detection

Memristor-based biomimetic compound eye for real-time collision detection

Biodegradable, Breathable Leaf Vein‐Based Tactile Sensors with Tunable Sensitivity and Sensing Range

An anti-freezing and anti-drying multifunctional gel electrolyte for flexible aqueous zinc-ion batteries

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