A Wearable, Bending-Insensitive Respiration Sensor Using Highly Oriented Carbon Nanotube Film

Nguyen, Thanh; Dinh, Toan; Dau, Van Thanh; Tran, Canh‐Dung; Phan, Hoang‐Phuong; Nguyen, Tuan‐Khoa; Nguyen, Hong Khac; Riduan, Foisal Abu; Guzmán, Pablo; Nguyen, Nam‐Trung; Dao, Dzung Viet

doi:10.1109/jsen.2020.3048236

Cited by 30 publications

(18 citation statements)

References 25 publications

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“…People's environmental feelings bring different audition feelings with climate change, temperature change, and seasonal change. Compared with other cities and regions, a certain region has higher latitude and cold climate [1].…”

Section: Introductionmentioning

confidence: 99%

Wearable Sensor and Its Application in Urban Landscape Design

Yao

2022

Journal of Sensors

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In order to meet the needs of people for the environment, physical, and psychological needs and to improve the characteristics of local areas, this paper proposes an urban environment measurement method based on wearable sensors. This method mainly relies on the previous questionnaire and tests the wearable sensor physiological data, subjective feelings, scoring tables, interviews, and other experimental methods in the psychological experimental environment. The recognition rate without adding association features was 93.3%, while the recognition rate of adding association features to individual test set verification reached 94.1%, an increase of about 1%. In this paper, naive Bayes and associated feature classification are used to effectively solve the influence of personal subjective factors and make up for the error of measurement data. The wearable sensor can achieve better results in the application of urban environmental measurement and can also be better applied in urban environmental landscape design, providing more effective data for urban landscape design.

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Section: Introductionmentioning

confidence: 99%

Wearable Sensor and Its Application in Urban Landscape Design

Yao

2022

Journal of Sensors

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“…CNT films embedded between electro‐spun polyacrylonitrile (PAN) layers were also reported as hot‐film airflow sensors, which were based on the resistance change induced by heat dissipation. [ 25 ] However, the coupled process of heat transfer in macroscale CNT/PAN composites would introduce additional time delay and increase the response time. The energy consumption would also be a problem because the electric heating of CNT films must be maintained in the whole sensing process.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Airflow Sensors Based on Suspended Carbon Nanotube Networks

et al. 2022

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applications. Recently, bionic fluffy fabrics learning from many animals, such as crickets and spiders, were reported to fabricate airflow sensors but usually exhibited low sensitivity and slow response speed against different airflows. [9,10] Therefore, the rational design and controllable fabrication of airflow sensors are urgently needed to tackle their issues of poor performance.For piezoresistive materials, sufficient deformation under external forces is the prerequisite for causing resistance variations, which calls for the excellent flexibility of the component materials. Besides, lightweight materials are easy to change their states of motion due to their low inertia, ensuring a fast response to external stimuli. For composite-based sensors, the interfacial areas within the composites should also be reduced because the interfaces often behave like capacitors under external electrical fields, [11] which inevitably causes a decline in the response speed of sensors owing to the charging-discharging processes. Therefore, from the perspective of material selection, flexible and lightweight materials with small interfacial areas show more advantages in fabricating highly sensitive and responsive piezoresistive sensors.Carbon nanotubes (CNTs) are supposed to be ideal candidates for fabricating high-performance piezoresistive airflow sensors because of their intrinsic properties, such as nanosized diameters, high aspect ratio and flexibility, low density, and excellent mechanical and electrical properties, [12,13] which fully meet the requirements for airflow sensors. However, the previous attempts to incorporate CNTs with other materials for making airflow sensors usually produced mixed bulky structures with declined mechanical properties, thus degrading their performance as sensors. [14][15][16][17][18] For example, the response time of many CNT-based sensors generally ranges from one to several seconds, [9,[19][20][21] which is far inferior to the expected performance of individual CNT-based sensors. [22][23][24] In previous studies, carbonized silk fabric (CSF) decorated with fluffylike CNTs were developed as piezoresistive airflow sensors, of which the sensing performance was simultaneously determined by the properties of CSF and CNTs. [9] Although the CNT assembly with a foam-like structure was capable of sensing very mild airflows, its response time was ≈1.3 s, which could High-performance airflow sensors are in great demand in numerous fields but still face many challenges, such as slow response speed, low sensitivity, large detection threshold, and narrow sensing range. Carbon nanotubes (CNTs) exhibit many advantages in fabricating airflow sensors due to their nanoscale diameters, excellent mechanical and electrical properties, and so on. However, the intrinsic extraordinary properties of CNTs are not fully exhibited in previously reported CNT-based airflow sensors due to the mixed structures of macroscale CNT assemblies. Herein, this article presents suspended CNT networks (SCNTNs) as high-performance a...

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“…The first is a result of the relaxation from polymer chains and the conductive network . The second is the impact of the Joule-heating effect in the first few minutes after supplying voltage to the aligned CNTs, which show a negative temperature coefficient of resistance . A detailed discussion is given in Note S2.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of “Tacky”, Stretchable, and Aligned Carbon Nanotube Sheet-Based Electronics for On-Skin Health Monitoring

Nguyen,

Mills,

Tran

et al. 2023

ACS Appl. Mater. Interfaces

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A Wearable, Bending-Insensitive Respiration Sensor Using Highly Oriented Carbon Nanotube Film

Cited by 30 publications

References 25 publications

Wearable Sensor and Its Application in Urban Landscape Design

Wearable Sensor and Its Application in Urban Landscape Design

Ultrasensitive Airflow Sensors Based on Suspended Carbon Nanotube Networks

Facile Fabrication of “Tacky”, Stretchable, and Aligned Carbon Nanotube Sheet-Based Electronics for On-Skin Health Monitoring

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