Humidity sensing properties of sprayed thin film MWCNT-PVP composites

Ghahremanpour, Mohammad Mehdi; Baumgartner, Edwin; Bogner, Martin; Boufercha, Nourdin; Sägebarth, Joachim; Sandmaier, H.

doi:10.1109/icsens.2011.6127069

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…The dynamic response curve of the pristine (non‐thermally treated 0%) PVP at 11%–75%–94% RH is shown in Figure a. From the dynamic response curve, the sensitivity of pristine PVP was about 440% at 75% RH, which was consistent with the experimental result reported . But, at 75% RH, the response and recovery times were about 95 and 5.5 s, respectively, which were so long that pristine PVP was not suitable for humidity sensor.…”

Section: Resultssupporting

confidence: 83%

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Effective Enhancement of Humidity Sensing Characteristics of Novel Thermally Treated MWCNTs/Polyvinylpyrrolidone Film Caused by Interfacial Effect

Pan

Zhang

Guo

et al. 2016

Adv Materials Inter

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Multi-walled carbon nanotubes (MWCNTs)/hydrophilic poly(vinylpyrrolidone) (PVP) fi lms are prepared by a simple spin-coating method and the resistive humidity sensing properties of the fi lms are studied in detail. It is demonstrated that the thermally treated MWCNTs/PVP fi lm exhibits a reproducible and great response over a wide relative humidity range from 11% to 94%, fast response time (less than 15 s) and ultrafast recovery time (less than 1.8 s), which are superior to that of pristine PVP fi lms. The effective enhancement of humidity sensing characteristics of MWCNTs/PVP fi lms can be explained by the MWCNTs/PVP interfacial effect. The thermally treated MWCNTs/PVP fi lms can be used as robust, cost-effective, and easy-to-use resistive humidity sensors. And the design concept used in this work can be extended to other carbon composites to fabricate excellent sensing materials for sensors.

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Section: Resultssupporting

confidence: 83%

“…Figure shows the response curve of the sensor between 11% and 94% RH under the voltage of 1 V at 27 ± 0.5 °C. At 94% RH, the sensitivity of sensor was 4000%, which was superior to resistive humidity sensors . Meanwhile, the response and recovery times between 11% and 94% RH were about 15 and 1.8 s, respectively.…”

Section: Resultsmentioning

confidence: 91%

Effective Enhancement of Humidity Sensing Characteristics of Novel Thermally Treated MWCNTs/Polyvinylpyrrolidone Film Caused by Interfacial Effect

Pan

Zhang

Guo

et al. 2016

Adv Materials Inter

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show abstract

“…Humidity sensors are also of great importance in several fields from agriculture, food production, and transportation to healthcare. These sensors should exclusively and accurately quantify environmental humidity and be stable to thermal variation, changing their electrical resistance only according to the environmental H 2 O concentration [221]. These sensors can be printed and, their readout can be measured as resistance or capacitance variation.…”

Section: Environmental and Electrochemical Sensorsmentioning

confidence: 99%

“…Regarding the functional materials, some examples include the use of high-water absorption films such as titanium dioxide (TiO 2 ) nanoparticles and MWCNT films. As an example, Ghahremanpour et al used spray printing to create humidity-sensitive thin films of MWCNT dispersed on polyvinylpyrrolidone (PVP) [221]. PVP is a hygroscopic polymer that swells during the uptake of water vapor.…”

Section: Environmental and Electrochemical Sensorsmentioning

confidence: 99%

The role of printed electronics and related technologies in the development of smart connected products

Buga¹,

Viana²

2022

Flex. Print. Electron.

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The emergence of novel materials with flexible and stretchable characteristics, and the use of new processing technologies, have allowed for the development of new connected devices and applications. Using printed electronics, traditional electronic elements are being combined with flexible components and allowing for the development of new smart connected products. As a result, devices that are capable of sensing, actuating, and communicating remotely while being low-cost, lightweight, conformable, and easily customizable are already being developed. Combined with the expansion of the Internet of Things, artificial intelligence, and encryption algorithms, the overall attractiveness of these technologies has prompted new applications to appear in almost every sector. The exponential technological development is currently allowing for the “smartification” of cities, manufacturing, healthcare, agriculture, logistics, among others. In this review article, the steps towards this transition are approached, starting from the conceptualization of smart connected products and their main markets. The manufacturing technologies are then presented, with focus on printing-based ones, compatible with organic materials. Finally, each one of the printable components is presented and some applications are discussed.

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“…The humidity sensitivity of single-walled and multiwalled CNTs has been investigated in several studies. − CNT-based composites are usually more sensitive to humidity changes compared to pure CNTs . There are several research efforts on designing multiwalled carbon nanotube (MWCNT)-based composites that can be used as fast response humidity-sensitive sensors. − …”

Section: Introductionmentioning

confidence: 99%

Gum Sensor: A Stretchable, Wearable, and Foldable Sensor Based on Carbon Nanotube/Chewing Gum Membrane

Darabi

Khosrozadeh

Wang

et al. 2015

ACS Appl. Mater. Interfaces

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Presented in this work is a novel and facile approach to fabricate an elastic, attachable, and cost-efficient carbon nanotube (CNT)-based strain gauge which can be efficiently used as bodily motion sensors. An innovative and unique method is introduced to align CNTs without external excitations or any complicated procedure. In this design, CNTs are aligned and distributed uniformly on the entire chewing gum by multiple stretching and folding technique. The current sensor is demonstrated to be a linear strain sensor for at least strains up to 200% and can detect strains as high as 530% with a high sensitivity ranging from 12 to 25 and high durability. The gum sensor has been used as bodily motion sensors, and outstanding results are achieved; the sensitivity is quite high, capable of tracing slow breathing. Since the gum sensor can be patterned into various forms, it has wide applications in miniaturized sensors and biochips. Interestingly, we revealed that our gum sensor has the ability to monitor humidity changes with high sensitivity and fast resistance response capable of monitoring human breathing.

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Humidity sensing properties of sprayed thin film MWCNT-PVP composites

Cited by 4 publications

References 11 publications

Effective Enhancement of Humidity Sensing Characteristics of Novel Thermally Treated MWCNTs/Polyvinylpyrrolidone Film Caused by Interfacial Effect

Effective Enhancement of Humidity Sensing Characteristics of Novel Thermally Treated MWCNTs/Polyvinylpyrrolidone Film Caused by Interfacial Effect

The role of printed electronics and related technologies in the development of smart connected products

Gum Sensor: A Stretchable, Wearable, and Foldable Sensor Based on Carbon Nanotube/Chewing Gum Membrane

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