Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications

Komatsu, Hiroaki; Kawamoto, Yurika; Ikuno, Takashi

doi:10.3390/nano12060940

Cited by 8 publications

(9 citation statements)

References 27 publications

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“…Detailed analysis of the surface morphology and optical properties is described in our previous work. [23] As previously reported, when our films were irradiated with UV-pulsed light while a constant voltage was applied to them, the films showed photoresponsivity. [23] Figure 1c presents the typical photocurrent dynamics under UV light (𝜆 = 365 nm) while applying a constant voltage (V = 3 V).…”

Section: Resultssupporting

confidence: 69%

Disposable and Flexible Paper‐Based Optoelectronic Synaptic Devices for Physical Reservoir Computing

Komatsu,

Hosoda,

Kounoue

et al. 2024

Adv Elect Materials

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Health monitoring using wearable artificial intelligence (AI) sensors with sensing and cognitive capabilities has garnered significant attention. The development of self‐contained AI sensors that can operate with low power consumption, akin to the human brain, is necessary. Physical reservoir computing (PRC), which mimics the human brain using physical phenomena, offers a low‐power consumption architecture. Nevertheless, creating a flexible and easily disposable sensors using PRC capable of processing optical signals with sub‐second response times suitable for biological signals presents a challenge. In this study, a disposable and flexible paper‐based optoelectronic synaptic devices are designed, which are composed of nanocellulose and ZnO nanoparticles, for PRC. This device exhibits synaptic photocurrent in response to optical input. To assess its performance, a classification and time‐series forecasting tasks are conducted. The memory capacity of short‐term memory task, indicating the device's ability to store past information, is 1.8. The device can recognize handwritten digits with an accuracy of 88%. These results highlight the potential of the device for PRC. In addition, subjecting the device to 1000 rounds of bending do not affect its accuracy. Furthermore, the device burn in a few seconds, much like regular office paper, demonstrating its disposability.

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Section: Resultssupporting

confidence: 69%

Disposable and Flexible Paper‐Based Optoelectronic Synaptic Devices for Physical Reservoir Computing

Komatsu,

Hosoda,

Kounoue

et al. 2024

Adv Elect Materials

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“…To prepare the solution for spray deposition, the MWNT dispersion was diluted by mixing 12 mL of the as-received solution with 20 mL of deionized (DI) water. The dispersion was then poured into the solution reservoir of a custom-made spraying machine 23 . PP films [thickness 200 µm; size 5 × 5 cm; P466-1, (MISUMI Corporation, Japan)] were fixed on the surface of a hot plate (HP-1SA, AS ONE Corporation, Osaka, Japan) and heated in air at 70 °C.…”

Section: Methodsmentioning

confidence: 99%

Direct formation of carbon nanotube wiring with controlled electrical resistance on plastic films

Komatsu

Matsunami

Sugita

et al. 2023

Sci Rep

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We have developed a simple method to fabricate multi-walled carbon nanotube (MWNT) wiring on a plastic film at room temperature under atmosphere pressure. By irradiating a MWNT thin film coated on a polypropylene (PP) film with a laser, a conductive wiring made of a composite of MWNT and PP can be directly fabricated on the PP film. The resistance of MWNT wiring fabricated using this method were ranging from 0.789 to 114 kΩ/cm. By changing the scanning speed of laser, we could fabricate various regions with different resistances per unit length even within a single wiring. The formation mechanism of the MWNT wiring with tunable resistance was discussed from both experimental results, such as microscopic structural observation using cross-sectional scanning electron microscopy and microscopic Raman imaging, and simulation results, such as heat conduction in the film during local laser heating. The results suggest that the MWNT wiring was formed by PP diffusion in MWNT at high temperature. We also demonstrated that excess MWNTs that were not used for wiring could be recovered and used to fabricate new wirings. This method could be utilized to realize all-carbon devices such as light-weight flexible sensors, energy conversion devices, and energy storage devices.

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“…The properties of the nanorods for UV sensor applications were assessed using the responsivity, sensitivity and response time [58], as shown in figures 9(b)-(e). ZnO nanorod samples were irradiated with UV light at different on-off intervals (τ uv-light ), as listed in table 3.…”

Section: Electrical and Optoelectrical Properties Of Zno Nanorodsmentioning

confidence: 99%

Relevance of alcoholic solvents in the growth of ZnO nanoparticles and ZnO hierarchical nanorod structures on their optical and opto-electrical properties

Nagpal,

Rauwel,

Ducroquet

et al. 2023

Nanotechnology

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We report on the synthesis of ZnO nanoparticles and ZnO hierarchical nanorod structures using four different alcohols i.e., methanol, isopropanol, ethanol, and aqueous ethanol (70% alcohol, 30% water). The syntheses of the nanoparticles were carried out by non-aqueous and hydrothermal routes. In general, absolute alcohol allows a better control of the synthesis reaction and nanoparticles as small as 5 nm were obtained, confirmed by TEM. XPS analysis elucidated the chemical states that were correlated to the synthesis reaction. For the nanorod growth, these four alcohols were used as seeding solvents, followed by hydrothermal ZnO nanorod growth. Here, the seed layer tailored the nanorod diameters and surface defects, which were studied by SEM and photoluminescence spectroscopy. Subsequently, The ZnO nanorods were electrically characterized and exhibited persistent photoconductivity under UV irradiation of 365nm. The differences in conductivity in dark and under UV irradiation were attributed to the size of the nanorods, defect states, semiconductor band bending and oxygen adsorption-desorption mechanisms. Parameters such as photoresponse and photosensitivity are also calculated in order to evaluate their applicability in UV sensors. This work demonstrates optimization of the physical, chemical, electrical and optical properties of both ZnO nanostructures via the use of alcoholic solvents.

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Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications

Cited by 8 publications

References 27 publications

Disposable and Flexible Paper‐Based Optoelectronic Synaptic Devices for Physical Reservoir Computing

Disposable and Flexible Paper‐Based Optoelectronic Synaptic Devices for Physical Reservoir Computing

Direct formation of carbon nanotube wiring with controlled electrical resistance on plastic films

Relevance of alcoholic solvents in the growth of ZnO nanoparticles and ZnO hierarchical nanorod structures on their optical and opto-electrical properties

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