Sorption/desorption hysteresis of thin-film humidity sensors based on graphene oxide and its derivative

Lee, Sang-Wook; Choi, Byung Il; Kim, Jong Chul; Woo, Sang-Bong; Kim, Yong-Gyoo; Kwon, Suyong; Yoo, Jeseung; Seo, Young‐Soo

doi:10.1016/j.snb.2016.06.113

Cited by 39 publications

(20 citation statements)

References 25 publications

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“…Synergistic reinforcement of mechanical interlocking and hydrogen bonding led to a dramatic increase in the tensile strength and Young’s modulus by 98.3% and 87%, respectively, at 7.5 wt% GO loading of PEI and the composite film showed robust humidity sensing performance over the RH range of 40–90%. Both Su’s group and Lee’s group studied amine-modified graphene oxide as sensing materials in humidity sensors, and demonstrated that the amine modification could improve the sensitivity towards humidity change, but may bring hysteresis-induced errors due to the interaction between water molecules and amine groups [157,158]. Wang et al proposed supramolecularly modified graphene naphthalene-1-sulfonic acid sodium salt and silver nanoparticles (Ag-NA-rGO), and the resulting supramolecular composite-based humidity sensor exhibited an excellent sensing performance between 11% and 95%, including an ultrafast response and recovery time of <1 s, and a high sensitivity and stability, which was attributed to the large surface area and wide interlayer spacing in the supramolecular composite [159].…”

Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

Recent Advances in Graphene-Based Humidity Sensors

et al. 2019

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Humidity sensors are a common, but important type of sensors in our daily life and industrial processing. Graphene and graphene-based materials have shown great potential for detecting humidity due to their ultrahigh specific surface areas, extremely high electron mobility at room temperature, and low electrical noise due to the quality of its crystal lattice and its very high electrical conductivity. However, there are still no specific reviews on the progresses of graphene-based humidity sensors. This review focuses on the recent advances in graphene-based humidity sensors, starting from an introduction on the preparation and properties of graphene materials and the sensing mechanisms of seven types of commonly studied graphene-based humidity sensors, and mainly summarizes the recent advances in the preparation and performance of humidity sensors based on pristine graphene, graphene oxide, reduced graphene oxide, graphene quantum dots, and a wide variety of graphene based composite materials, including chemical modification, polymer, metal, metal oxide, and other 2D materials. The remaining challenges along with future trends in high-performance graphene-based humidity sensors are also discussed.

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Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

Recent Advances in Graphene-Based Humidity Sensors

et al. 2019

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“…In addition, humidity hysteresis—another criterion that is commonly used to estimate the reliability of humidity sensors—was also tested for PIL-Br sensors with varying thickness. The humidity hysteresis is defined as the maximum difference of the humidity sensor between the adsorption and desorption process [26]; thus, the humidity hysteresis was calculated to be 3.2% RH (Figure 4c), 4.3% RH (Figure 4f) and 5.2% RH (Figure 4i) for PIL-Br-10, PIL-Br-20 and PIL-Br-30 within the working range of 11%–98% RH, respectively. This result can further confirm the good reliability of PIL-Br humidity sensors.…”

Section: Resultsmentioning

confidence: 99%

New Insights on the Fast Response of Poly(Ionic Liquid)s to Humidity: The Effect of Free-Ion Concentration

et al. 2019

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The swelling mechanism is widely used to explain the response of ionic liquids (ILs) or poly(ionic liquid)s (PILs) to moisture. While a fairly broad consensus has been attained, there are still some phenomena that are not well explained. As a complement to the swelling mechanism, we systematically studied the free volume theory in the rapid response and recovery of PIL humidity performance. We chose poly(1-ethyl-3-vinylimidazolium bromide) (PIL-Br), poly(1-ethyl-3-vinylimidazolium tetrafluoroborate) (PIL-BF4) and poly(1-ethyl-3-vinylimidazolium bis(trifluoromethane sulfonimide)) (PIL-TFSI) as model materials and investigated the impact of PIL structure including anion type, film thickness and affinity to moisture on performance to obtain the humidity sensing mechanism for PILs based on free volume theory. Hence, we can combine free volume theory with the designed PIL structures and their affinity with moisture to obtain a high concentration of free ions in PIL sensing films. Furthermore, the PIL humidity sensors also show fast, substantial impedance changes with changing humidity for real-time monitoring of the human respiratory rate due to a fast response and recovery performance. Therefore, our findings develop a new perspective to understand the humidity performance of PILs based on free volume theory, resulting in fast response and recovery properties realized by the rational design of PIL sensing films.

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“…We would also like to mention that work done by [24] has shown that multilayer graphene and graphene has alternating resistance change due to the competing effects of charge transfer and protonic conduction. Sensors which use bilayer [21] and CVD graphene [23], have higher sensitivity, but require a more complicated synthesis process, where the graphene needs to be grown on a metal catalyst layer before being transferred to the desired substrate.…”

Section: B Humidity Response Of Ncg Filmsmentioning

confidence: 99%

“…Carbon-based sensors show promise in addressing the shortcomings of metal oxide and polymer based sensors [20]- [30]. Such sensors includes carbon nanotube (CNT) based sensors [20], [22], [31], [32], exfoliated graphene or reduced graphene oxide (rGO) based films [21], [26], polymer-graphene composite films [27], [29], [30], [33], and graphene/multilayer-Sensors-25539-2019 graphene/graphite films deposited using chemical vapour deposition (CVD) [24], [28], [34]. Carbon films with high sp 2 bonds (CNT, graphene, graphite) are known to be stable when exposed to environmental factors, such as weak acids and UV [35] [36].…”

Section: Introductionmentioning

confidence: 99%

Sensing Performance of Nanocrystalline Graphite-Based Humidity Sensors

Ling

Fishlock

et al. 2019

IEEE Sensors J.

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Environmental sensors play a crucial role in a wide range of applications. Amongst them, humidity sensors that are stable and operational in harsh environments are incredibly important for process control and monitoring. Nanocrystalline graphite (NCG) is a type of carbon-based thin film material. Previous work has shown that NCG has excellent mechanical properties and is able to withstand high radiation doses. The granular structure of the NCG film makes it a good candidate for humidity sensing as the film consists of conductive graphitic grains with a high density of sp 2 bonds and amorphous grain boundaries with high resistivity, adsorption of water molecule onto the film forms conductive pathways between grains through the Grotthuss mechanism which lowers the resistance of the film by a measurable amount. Here we report for the first time, a working humidity sensor with linear response, fabricated using NCG as the sensing material for harsh, real-world environments, which include exposure to weak acids via rainfall, UV radiation, mechanical wear, and high humidity environments. The calculated sensitivity of the best-fabricated sensor is S = 0.0334%, with a maximum resistance change of-4.4 kOhms, over the range of 15% RH to 85% RH. The response time of the sensor is 20ms with the current measurement setup. The baseline resistance value of the sensor at 15% RH is 210 kOhms. The sensor has the potential to be used as a humidity sensor for harsh environments due to the chemical, thermal and mechanical stability of the NCG film.

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Sorption/desorption hysteresis of thin-film humidity sensors based on graphene oxide and its derivative

Cited by 39 publications

References 25 publications

Recent Advances in Graphene-Based Humidity Sensors

Recent Advances in Graphene-Based Humidity Sensors

New Insights on the Fast Response of Poly(Ionic Liquid)s to Humidity: The Effect of Free-Ion Concentration

Sensing Performance of Nanocrystalline Graphite-Based Humidity Sensors

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