One-Step Fabrication of Pyranine Modified- Reduced Graphene Oxide with Ultrafast and Ultrahigh Humidity Response

Chen, Zhuo; Wang, Yao; Shang, Ying; Umar, Ahmad; Xie, Peng; Qi, Qi; Zhou, Guofu

doi:10.1038/s41598-017-02983-8

Cited by 22 publications

(24 citation statements)

References 44 publications

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“…Humidity sensors based on HFBI modified rGO showed a highly improved sensitivity compared to that based on pristine rGO (Figure 14d,e). Chen et al employed a similar supramolecular assembly method to modify rGO with functional organic molecule pyranine, which has a pyrene ring decorated with hydrophilic sulfonic groups and can assemble with rGO through π-π interactions (Figure 14f) [163]. A humidity sensor based on this composite exhibited an excellent sensing performance, including a high sensitivity between 11% and 95% RH, fast response time of <2 s, small hysteresis of 8% RH, and good repeatability and stability (Figure 14g,h).…”

Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

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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%

“…Schematic of the supramolecular assembly of Pyr-rGO sheets with the corresponding physical image in dispersion ( f ), the impedance curves of Pyr-rGO based humidity sensors measured at different frequencies under different RH levels ( g ), and the five-cycle response-recovery curve of Pyr-rGO ( h ). Adapted from [163].…”

Section: Figurementioning

confidence: 99%

Recent Advances in Graphene-Based Humidity Sensors

et al. 2019

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“…Humidity sensor is an important kind of sensors because of their critical roles in daily life such as indoor humidity sensing, weather forecasting, medical care, and agricultural and industrial environmental monitoring, especially in the fast-developing wearable electronics. − For a humidity sensor, not only the sensing performance such as high and fast response to humidity change, but low cost, easy fabrication, and good flexibility are also important for practical use, most of which are dependent on the sensing materials and fabrication methods. Although lots of effective sensing materials and methods have been developed to prepare humidity sensors; − it is still a challenge, but important to make the fabrication easier and the performance better.…”

Section: Introductionmentioning

confidence: 99%

Laser Direct Writing of a High-Performance All-Graphene Humidity Sensor Working in a Novel Sensing Mode for Portable Electronics

Cai

Aoyagi

et al. 2018

ACS Appl. Mater. Interfaces

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This paper reports a fast and highly sensitive all-graphene humidity sensor working in a novel alternating current (ac) detection mode for the first time, which is capable of sensing humidity on a smartphone for portable electronics. The humidity sensor is based on an interdigitated reduced graphene oxide/graphene oxide/rGO (rGO/GO/rGO) structure patterned by a facile laser direct writing method. It works in an ac sensing mode with a rectangular input voltage wave and measures the output voltage wave instead of conventional resistance, impedance, or capacitance, exhibiting a dramatically enhanced sensitivity by about 45 times compared to the low and unstable response in dc mode. The humidity sensor shows an obvious response to the relative humidity (RH) ranging from RH 6.3% to RH 100%. The response and recovery toward humidity change are almost instantaneous, and the corresponding costed times including humidity rise and decay times are less than 1.9 and 3.9 s, respectively, which are among the best results in the literature. The sensor also exhibits outstanding cycling stability, flexibility, and long-term stability (>1 year), as well as good reproducibility of device preparation. Besides, it can be easily connected to an iPhone and the humidity sensing can be conducted with an oscilloscope application on iOS. What's more, an electronic circuit simulation method was employed to fit the output waves, which can not only explain the sensing mechanism, but also determine the resistance and capacitance of the rGO/GO/rGO structure, agreeing well with the results obtained from the electrochemical measurements. It can be reasonably expected that the approach combining humidity sensing and electronic circuit simulation can be applied in real-time monitoring on a smartphone based on the Internet of things and big data technologies.

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“…Pyranine‐modified rGO was used by Chen et al. [ 106 ] to assemble a fast and highly sensitive humidity sensor. The hybrid was produced in a one‐pot procedure by contemporarily reducing GO with hydrazine and forming the noncovalent assembly with pyranine which assisted in stabilizing rGO in water (Figure 14b).…”

Section: Classes Of Hybrid Assemblies Based On Graphenementioning

confidence: 99%

Graphene‐Based Hybrid Functional Materials

Anichini

Samorı́

2021

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Graphene is a 2D material combining numerous outstanding physical properties, including high flexibility and strength, extremely high thermal conductivity and electron mobility, transparency, etc., which make it a unique testbed to explore fundamental physical phenomena. Such physical properties can be further tuned by combining graphene with other nanomaterials or (macro)molecules to form hybrid functional materials, which by design can display not only the properties of the individual components but also exhibit new properties and enhanced characteristics arising from the synergic interaction of the components. The implementation of the hybrid approach to graphene also allows boosting the performances in a multitude of technological applications. This review reports the hybrids formed by graphene combined with other low‐dimensional nanomaterials of diverse dimensionality (0D, 1D, and 2D) and (macro)molecules, with emphasis on the synthetic methods. The most important applications of these hybrids in the fields of sensing, water purification, energy storage, biomedical, (photo)catalysis, and opto(electronics) are also reviewed, with a special focus on the superior performances of these hybrids compared to the individual, nonhybridized components.

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One-Step Fabrication of Pyranine Modified- Reduced Graphene Oxide with Ultrafast and Ultrahigh Humidity Response

Cited by 22 publications

References 44 publications

Recent Advances in Graphene-Based Humidity Sensors

Recent Advances in Graphene-Based Humidity Sensors

Laser Direct Writing of a High-Performance All-Graphene Humidity Sensor Working in a Novel Sensing Mode for Portable Electronics

Graphene‐Based Hybrid Functional Materials

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