Carbon Dots as Sensing Layer for Printed Humidity and Temperature Sensors

Rivadeneyra, Almudena; Salmerón, José F.; Murru, Fabio; Lapresta-Fernández, A.; Rodríguez, Noel; Capitán-Vallvey, L.F.; Morales, Diego P.; Salinas-Castillo, Alfonso

doi:10.3390/nano10122446

Cited by 14 publications

(8 citation statements)

References 43 publications

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“…Another important development in humidity sensor fabrication is the use of thick film technology, where sensor's sensitive layers can be screen printed on a ceramic (usually alumina) and flexible substrates [21], [22]. Screen printing is done by squeezing a paste material through a (stainless-steel) mesh with predefined patterns.…”

Section: Introductionmentioning

confidence: 99%

The Effect of SnO2 Mixture on a PVA-Based Thick Film Relative Humidity Sensor

Wiranto¹,

Martadi²,

Sulthoni³

et al. 2022

International Journal on Advanced Science, Engineering and Information Technology

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In this research, thick film technology has been used to design and fabricate relative humidity sensors with Polyvinyl Alcohol (PVA) as the sensing layer. The design was optimized to produce an ideal geometry according to the limitations of thick film technology. The sensor fabrication process used screen printing techniques on Alumina (Al2O3) substrate with Silver (Ag) as the electrode material. SnO2 was added to the PVA sensing layer with variations in the composition of 1:1 and 1:2. FTIR analysis showed that the addition of SnO2 did not affect the structure of the PVA, which indicated that there was no chemical reaction between PVA and SnO2. The deposition of the sensing layer was carried out using spin coating method, and the fabricated sensors were then tested by varying 5 humidity points inside a chamber with a hygrometer as a reference. Based on the test results, it was found that the sensors showed responses to humidity variation in the form of changes in resistance values. When the humidity in the chamber increased, the sensor resistance value decreased. The addition of SnO2 could reduce the relatively high resistance value of the PVA-based humidity sensor and also increase the sensor's time response to humidity variation. However, the humidity sensor's sensitivity decreased for the higher composition of SnO2. With this technique, a simple yet stable humidity sensor could be fabricated using thick-film technology with a wide range of potential applications.

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Section: Introductionmentioning

confidence: 99%

The Effect of SnO2 Mixture on a PVA-Based Thick Film Relative Humidity Sensor

Wiranto¹,

Martadi²,

Sulthoni³

et al. 2022

International Journal on Advanced Science, Engineering and Information Technology

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“…[302] Various printing technologies have been exploited for the fabrication of humidity sensor on several substrates, e.g. patterning on PI, [303] screen printing on KAPTON, [304] glass, [305] PI, [306,307] PET, [308,309] gravure printing on PET [180,310] and PI, [311,312] screen and gravure combined on PET, [181,313] inkjet printing on PET, [314][315][316][317] PI, [318] paper [319] and on KAPTON, [320] photolithography on LiNbO 3, [321] PI and PES [322] or piezoelectric [323] substrate, etc. Table 7 summarizes the printed textile-based humidity sensors.…”

Section: Printed Textile Humidity Sensormentioning

confidence: 99%

Advances in Printed Electronic Textiles

Islam,

Afroj,

Yin

et al. 2023

Advanced Science

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Electronic textiles (e‐textiles) have emerged as a revolutionary solution for personalized healthcare, enabling the continuous collection and communication of diverse physiological parameters when seamlessly integrated with the human body. Among various methods employed to create wearable e‐textiles, printing offers unparalleled flexibility and comfort, seamlessly integrating wearables into garments. This has spurred growing research interest in printed e‐textiles, due to their vast design versatility, material options, fabrication techniques, and wide‐ranging applications. Here, a comprehensive overview of the crucial considerations in fabricating printed e‐textiles is provided, encompassing the selection of conductive materials and substrates, as well as the essential pre‐ and post‐treatments involved. Furthermore, the diverse printing techniques and the specific requirements are discussed, highlighting the advantages and limitations of each method. Additionally, the multitude of wearable applications made possible by printed e‐textiles is explored, such as their integration as various sensors, supercapacitors, and heated garments. Finally, a forward‐looking perspective is provided, discussing future prospects and emerging trends in the realm of printed wearable e‐textiles. As advancements in materials science, printing technologies, and design innovation continue to unfold, the transformative potential of printed e‐textiles in healthcare and beyond is poised to revolutionize the way wearable technology interacts and benefits.

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“…The sensors’ properties were tailored by using different design sizes. Another interesting development regarding custom ink development was the work recently published by Rivadeneyra et al [ 42 ]: carbon dots (Cdots) were synthesized using dissolved citric acid and polyethyleneimine (PEI) in water, followed by drop-casting of the active layer on screen-printed Ag electrodes.…”

Section: Printed Humidity Sensorsmentioning

confidence: 99%

“…The sensors' properties were tailored by using different design sizes. Another interesting development regarding custom ink development was the work recently published by Rivadeneyra et al [42]: carbon dots (Cdots) were synthesized using dissolved citric acid and polyethyleneimine (PEI) in water, followed by drop-casting of the active layer on screen-printed Ag electrodes. Romero et al [36] recently compared development of a capacitive humidity sensor on Kapton via inkjet printing Ag lines for a fully printed sensor versus similar electrode geometries developed by laser-induced graphene and graphene oxide (Figure 11a).…”

Section: Pet-based Capacitive Printed Humidity Sensorsmentioning

confidence: 99%

A Review on Humidity, Temperature and Strain Printed Sensors—Current Trends and Future Perspectives

Barmpakos

Kaltsas

2021

Sensors

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Printing technologies have been attracting increasing interest in the manufacture of electronic devices and sensors. They offer a unique set of advantages such as additive material deposition and low to no material waste, digitally-controlled design and printing, elimination of multiple steps for device manufacturing, wide material compatibility and large scale production to name but a few. Some of the most popular and interesting sensors are relative humidity, temperature and strain sensors. In that regard, this review analyzes the utilization and involvement of printing technologies for full or partial sensor manufacturing; production methods, material selection, sensing mechanisms and performance comparison are presented for each category, while grouping of sensor sub-categories is performed in all applicable cases. A key aim of this review is to provide a reference for sensor designers regarding all the aforementioned parameters, by highlighting strengths and weaknesses for different approaches in printed humidity, temperature and strain sensor manufacturing with printing technologies.

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Carbon Dots as Sensing Layer for Printed Humidity and Temperature Sensors

Cited by 14 publications

References 43 publications

The Effect of SnO2 Mixture on a PVA-Based Thick Film Relative Humidity Sensor

The Effect of SnO2 Mixture on a PVA-Based Thick Film Relative Humidity Sensor

Advances in Printed Electronic Textiles

A Review on Humidity, Temperature and Strain Printed Sensors—Current Trends and Future Perspectives

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