Flexible and Biodegradable Sensors: Materials, Manufacturing Technology and Devices on Its Basis

Lapshuda, Vladyslav; Koval, Viktoriia

doi:10.20535/kpisn.2021.2.229964

Cited by 4 publications

(5 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Тому моніторинг дихання є корисним для клінічних досліджень та діагностики деяких захворювань. Іншим застосуванням сенсорів вологості є моніторинг показників здоров'я під час реабілітації і тренування спортсменів [8][9][10][11][12][13][14][15][16]. Взагалі діапазон роботи сенсорів залежить від галузі, для якої він призначений.…”

Section: Iunclassified

“…Для зберігання електроніки відносна вологість повітря повинна бути менше 1% для запобігання окиснення і корозії клем. Однак деякі виробничі процеси можуть вимагати більш високого рівня вологості, наприклад, термічне окислення кремнію [11].…”

Section: Iunclassified

“…Найбільш вживаними серед них є резистивні та ємнісні сенсори. Принцип дії ємнісних сенсорів полягає у зміні ємності сенсора під дією вологи Зазвичай в сенсорах вологи як вологочутливий матеріал використовують штучні полімери, які призводять до забруднення навколишнього середовища (PI, PET, GO, rGO тощо) [11,18]. Останнім часом розробляються природні матеріали, які здатні до біологічного розкладання та не призводять при цьому до екологічного забруднення.…”

Section: Iunclassified

See 2 more Smart Citations

Capacitive Humidity Sensors Based on Nanocellulose for Biodegradable Electronics

Lapshuda

Linevych

Dusheiko

et al. 2022

Microsyst., Electron. & Acoust.

Self Cite

View full text Add to dashboard Cite

The humidity sensor is an important device used in many areas of human life, such as agriculture, medicine, industry, meteorology and more. Most often, synthetic polymers are used for the manufacture of humidity sensors, which after the end of their operation are accumulated in the form of electronic waste, polluting the environment. Currently, biodegradable polymers are in great demand. Such materials include nanocellulose, which can be made from both wood and plant raw materials. It has already been proven that nanocellulose is a promising material for use in humidity-sensitive devices. However, it was not clear the effect of sensitive film’s thickness on the characteristics of humidity sensors. In this work, capacitive humidity sensors based on nanocellulose were fabricated. Nanocellulose (NC) was obtained from reeds by the TEMPO method. The moisture-sensitive layer of NC was applied by dripping. Static (sensitivity, response, hysteresis) and dynamic (response time, recovery time, short- and long-term stability) characteristics of the manufactured humidity sensors were measured in dependence on mass of NC film (from 0.3 to 3.6 mg) and test signal frequency (100 Hz and 1000 Hz). The response of the sensors was increased with the weight of moisture-sensitive NC film and reached 1412 nF at 100 Hz (783 nF at 1000 Hz) for the sample of 0.6 mg NC, and then decreased with further increase in mass. The sensitivity of the sensors varied similarly, but the maximum value was observed for the sample with a mass of 1.8 mg and was 0.161 (%RH)-1 for 100 Hz (0.165 (%RH)-1 for 1000 Hz). The shortest response time had the sample with the lowest mass of moisture-sensitive film (100 s). With a further increase in the mass of moisture-sensitive NC film, the response and recovery time increased monotonically. Also, the sample with the lowest mass of the moisture-sensitive layer shows the lowest value of hysteresis (0.1%) and also increased with the increasing mass of the moisture-sensitive layer. In the study of short-term stability, samples weighing from 0.3 to 0.6 mg showed a significantly higher level of fluctuations (10 - 20%) compared to samples with a weight of the moisture-sensitive layer of 1.8 - 3.6 mg (1 - 4%). So, you should use nanocellulose film of larger mass (1.8… 3.6 mg) in order to improve the sensitivity and short-term stability of the devices. In view of the responce and recovery time as well as repeatability of the sensor characteristics, thin nanocellulose films (0.3… 0.5 mg) should be used. The direction of further research is to improve the long-term stability of the devices, in particular by modifying the nanocellulose film with adding certain impurities.

show abstract

Section: Iunclassified

See 1 more Smart Citation

Capacitive Humidity Sensors Based on Nanocellulose for Biodegradable Electronics

Lapshuda

Linevych

Dusheiko

et al. 2022

Microsyst., Electron. & Acoust.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Для таких застосувань розробляють гнучкі прилади, які можуть кріпитися на тіло або одяг людини, що прилягає до тіла. Такі сенсори здатні повторювати форму тіла та деформуватися за потреби, не руйнуючись та не викликаючи дискомфорту пацієнта при їх використанні [1].…”

Section: вступunclassified

Flexible Humidity Sensors Based on Nanocellulose for Wearable Electronics

Lapshuda¹,

Koval²,

Dusheiko³

et al. 2022

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

View full text Add to dashboard Cite

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.

show abstract

“…Сенсори вологості атмосферного повітря (humidity sensors). Найчастіше сенсори виготовляють на твердій ситаловій або гнучкій підкладці з паперу чи штучних полімерів PET, PI тощо, а в якості вологочутливої плівки використовують металооксидні матеріали, оксид графену або композити на його основі [25]. Завдяки гідрофільності наноцелюлоза також застосовується в сенсорах вологості як ємнісного, так резистивного типу [26], у якості вологочутливого шару [26], а також гнучкої підкладки [27] як в чистому вигляді [28], так і в складі композитів [29].…”

Section: сенсори вологостіunclassified

Sensors Based on Nanocellulose for Biodegradable, Flexible, Disposable and Wearable Electronics

Naidonov¹

2022

KPI SN

View full text Add to dashboard Cite

Problems. Rapid technical progress has led to a reduction in the useful life of consumer electronics. The introduction of green, flexible, biodegradable electronic devices will prevent an environmental catastrophe. Recently, the use of organic materials instead of inorganic analogues has become increasingly popular, which makes it possible to move from rigid solid-state sensors for multiple use that require disposal to flexible, disposable sensors that are suitable for human wear on the body or clothing and for spontaneous decomposition in nature after using. One of such promising organic materials is nanocellulose. The aim of the study. Studying the possibility of nanocellulose application for the manufacture of flexible, wearable, disposable sensors of various types of physical and chemical quantities. Methodology of implementation. In the article the analysis, classification and comparision of various technologies and features of synthesis, as well as the main characteristics of flexible sensors made on the basis of nanocellulose were fulfilled. Also the main parameters of flexible sensors based on nanocellulose were being compared with corresponding analogs of sensors based on artificial polymers. Research results. The paper established the physical and technological features of using nanocellulose for the manufacture of sensors of various types of physical and chemical quantities in order to improve their performance. It has been established that nanocellulose can be used both as a substrate and as a sensitive element of a sensor. It has also been shown that nanocellulose is suitable for use in sensors based on both electrical physical phenomena and optical effects. Conclusions. Nanocellulose is a promising biodegradable material on the basis of which flexible, disposable, wearable sensors can be created. The manufacturing technology of such sensors should contain only low-temperature and dry processing processes. For effective use in certain types of sensors, it is advisable to manufacture nanocellulose with a modified surface or in the form of composites with other nanomaterials. Based on the obtained results, it is possible to improve existing and develop new methods of creating flexible wearable disposable sensors that do not require disposal.

show abstract

Flexible and Biodegradable Sensors: Materials, Manufacturing Technology and Devices on Its Basis

Cited by 4 publications

References 71 publications

Capacitive Humidity Sensors Based on Nanocellulose for Biodegradable Electronics

Capacitive Humidity Sensors Based on Nanocellulose for Biodegradable Electronics

Flexible Humidity Sensors Based on Nanocellulose for Wearable Electronics

Sensors Based on Nanocellulose for Biodegradable, Flexible, Disposable and Wearable Electronics

Contact Info

Product

Resources

About