CuO nanostructure-based flexible humidity sensors fabricated on PET substrates by spin-spray method

Nitta, Ryosuke; Lin, Hwai-En; Kubota, Yuta; Kishi, Takuya; Yano, Tetsuji; Matsushita, Nobuhiro

doi:10.1016/j.apsusc.2021.151352

Cited by 39 publications

(19 citation statements)

References 42 publications

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“…The XRD spectra of the pure PET fiber, MWCNTs modified PET fiber, laser-processed sample, and sample after electroless cobalt–nickel alloy plating are shown in Figure g. Several broad diffraction peaks around 20° can be ascribed to PET fibers, while broader characteristic peaks around 10° and 53° can be assigned to MWCNTs . Moreover, the three characteristic peaks located at 2θ = 44.5°, 50.9°, and 74.3° can be attributed to the cubic nickel (111), (200), and (222) crystal planes .…”

Section: Resultsmentioning

confidence: 99%

Shielding-Sensing Integrated Multilayer PET–Carbon Nanotube Composites for 5G Applications

Guo

Rosenkranz

et al. 2022

ACS Appl. Electron. Mater.

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We designed a shielding–sensing integrated multilayer composite based on PET (poly(ethylene terephthalate)) and carbon nanotubes using UV laser scribing and electroless plating. APTES ((3-aminopropyl)triethoxysilane)-modified carbon nanotubes and the mixture of carbon nanotubes and silica gel were used as the active and shielding layer in the composite, respectively. The electrochemical performance and electromagnetic shielding effectiveness (SE) were investigated to assess the sensing and shielding properties of the composite. Under optimized conditions, the sensor achieved a sensitivity of 6699.0 μA mM–1 cm–2 with a linear range (LR) of 1.0–5 mM at high concentrations toward glucose oxidation. In contrast, a sensitivity of 7140.0 μA mM–1 cm–2 in the linear range of 10–60 μM was displayed for low concentrations. Simultaneously, the composite exhibited a SE value up to 43.64 dB between 30 and 6000 MHz. To explore the protective effect of the designed composite, the electric field distribution was calculated through finite difference time domain (FDTD) simulations. Additionally, tensile tests were conducted to validate the excellent serviceability and stretchability of the composite. The as-prepared multilayer composite with integrated shielding–sensing function holds great potential in the wearable physiology monitoring and electromagnetic interference shielding applications for 5G electronic products.

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Section: Resultsmentioning

confidence: 99%

Shielding-Sensing Integrated Multilayer PET–Carbon Nanotube Composites for 5G Applications

Guo

Rosenkranz

et al. 2022

ACS Appl. Electron. Mater.

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“…Останнім часом зусилля дослідників зосереджені на розробці різних видів гнучких підкладок та вологочутливих матеріалів, які наносяться на їх поверхню, з метою одержання чутливих і стабільних сенсорів вологості задовільної гнучкості. Для цього як підкладки використовуються модифікований папір [2], [3], поліетилентерафталат (PЕТ) [4]- [6], поліімід [7], нанокристалічна целюлоза (CNC) [8], поліетилен нафталат (PEN) [9]. Найбільшою фізичною довговічністю характеризуються синтетичні полімери.…”

Section: вступunclassified

“…Аналіз впливу методу одержання гідрогелю НЦ показав, що даний технологічний параметр здійснює значно менший вплив на чутливість (зміна показників знаходиться в межах 20-25 %), аніж на динамічні параметри (зміна показників знаходиться в межах 1-1,5 порядки). Так, зразки R-3 та R-4 характеризуються відгуком 6,06‧10 3 га 3,69‧10 4 Аналогічна тенденція спостерігається для низки динамічних параметрів (відхилення під час циклювання, часу відгуку та часу відновлення), які значно покращуються при переході до конфігурації електродів типу ЗШГ за однакового вихідного матеріалу (НЦ-ОТ). Це може бути пояснене меншою відстанню між шинами, аніж для плоскопаралельної конфігурації, що забезпечує швидшу реакцію сенсора на зміну рівня відносної вологості.…”

Section: гнучкі резистивні сенсори вологості на основі плоскопаралель...unclassified

Flexible Humidity Sensors Based on Nanocellulose for Wearable Electronics

Lapshuda¹,

Koval²,

Dusheiko³

et al. 2022

Bull. Kyiv Polytech. Inst. Ser. Instrum. Mak.

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Problem. Humidity control is necessary for many areas of modern human life, including agriculture, food and automotive industries, electronics manufacturing, medicine and everyday life. A new trend in medical sensors is the use of flexible wearable sensors that can be attached to a person's body or the clothing adjacent to it. Such sensors are able to repeat the shape of the body and deform as needed, without breaking or causing discomfort to the patient. Today, nanocellulose (NC) is a rather promising humidity-sensitive material, which is characterized by high hydrophilicity and sufficient flexibility, and at the same time it is a biodegradable material. The purpose of the work. Development and research of flexible humidity sensors based on nanocellulose as a moisture-sensitive film, depending on the nature of the raw material and the method of NC manufacturing, as well as the configuration of the device electrodes. Research results. Three groups of humidity sensors were manufactured: capacitive sensors with electrodes in the form of expanded capacitor; resistive sensors made on the base of interdigital electrodes; resistive sensors made on the base of planar-parallel electrodes. In each configuration, 4 different nanocellulose hydrogels were used, made from reed or wheat straw by hydrolysis or TEMPO methods. The static and dynamic characteristics of humidity sensors were investigated, and conclusions were drawn regarding the optimal type of electrode configuration, raw materials and the method of NC synthesis. The largest sensitivity and the smallest hysteresis are demonstrated by the sensor made on the basis of an interdigital electrode and nanocellulose, synthesized by the TEMPO method - 0.164 (%RH)-1 and 1.5%, respectively. However, the high speed (response time - 6 s, recovery time - 10 s), short-term stability (deviation during device measuring under constant humidity for 1 h - 1.4%) and repeatability of results (deviation during cycling between different humidity levels - 1.6%) are observed for sensors, manufactured by the hydrolysis method, and for both types of sensors (resistive and capacitive device). Conclusions. It was established that the static parameters (response, sensitivity and reversibility) of humidity sensors depend mainly on the type of electrode configuration and the source material for the NC synthesis, while dynamic parameters (repeatability during cycling, short-term stability, response time and recovery time) depend on NC synthesis method. At the same time, it was shown that resistive sensors demonstrate significantly better parameters of sensitivity and hysteresis compared to capacitive devices. The obtained flexible humidity sensors can be used in wearable medical electronics.

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“…For example, Ryosuke Nitta reported the preparation of a flexible resistive humidity sensor with CuO nanostructures on polyethylene terephthalate substrates via the spin−spray method, which offered a fast response/recovery time of 2 s/2.8 s and a sensitivity of 170% at an RH of 20−70%. 11 However, these humidity sensors depend on an external power supply, limiting their range of applicability and leading to growing environmental pollution problems. Therefore, a series of various new technologies based on triboelectricity, 12−14 piezoelectricity, 15,16 photovoltaics, 17 thermoelectricity, 18 and moist-electric generation 19,20 have been developed to meet the requirements of green sustainable energy supply and to provide possible solutions for the development of self-powered sensors.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the fields of wearable electronics, physiological health monitoring, and environmental monitoring, flexible humidity sensors have attracted a lot of attention as a device that can detect changes in air humidity and transmit signals while having excellent foldability and flexibility. − To date, various types of humidity sensors have been made that use signals such as frequency, capacitance, resistance, current, and colorimetry to achieve humidity response. For example, Ryosuke Nitta reported the preparation of a flexible resistive humidity sensor with CuO nanostructures on polyethylene terephthalate substrates via the spin–spray method, which offered a fast response/recovery time of 2 s/2.8 s and a sensitivity of 170% at an RH of 20–70% . However, these humidity sensors depend on an external power supply, limiting their range of applicability and leading to growing environmental pollution problems.…”

Section: Introductionmentioning

confidence: 99%

Self-Powered Carbon Ink/Filter Paper Flexible Humidity Sensor Based on Moisture-Induced Voltage Generation

Guo

Meng

et al. 2022

Langmuir

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Cellulose paper-based materials are highly flexible, hydrophilic, low-cost, and environmentally friendly and are good substrates for use as humidity sensors. Therefore, developing a paper-based humidity sensor with facile fabrication, low cost, and high sensitivity is important for expanding its practical applications. Herein, we propose a CI/FP self-powered humidity sensor based on everyday items such as writing and drawing carbon ink (CI), cellulose filter paper (FP), and polyester conductive adhesive tape, which is fabricated with the help of facile dip-coating and pasting methods. This sensor is self-powered, and the paper-based material itself can absorb water molecules in a humid environment to generate humidity-related voltage and current, which can indirectly reflect the ambient humidity level. They are characterized by a wide relative humidity (RH) sensing range (11−98%), good linearity (R 2 = 0.97011), high response voltage (0.19 V), and excellent flexibility (over 1000 bends). This humidity sensor can be successfully applied to monitor human health (breathing, coughing), air humidity, and noncontact humidity sensing (skin, wet objects). This work not only proposes a low-cost and facile method for flexible humidity sensors but also provides a valuable strategy for the development of self-powered wearable electronics.

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CuO nanostructure-based flexible humidity sensors fabricated on PET substrates by spin-spray method

Cited by 39 publications

References 42 publications

Shielding-Sensing Integrated Multilayer PET–Carbon Nanotube Composites for 5G Applications

Shielding-Sensing Integrated Multilayer PET–Carbon Nanotube Composites for 5G Applications

Flexible Humidity Sensors Based on Nanocellulose for Wearable Electronics

Self-Powered Carbon Ink/Filter Paper Flexible Humidity Sensor Based on Moisture-Induced Voltage Generation

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