Flexible humidity sensor based on light-scribed graphene oxide

Ouda, Emtinan; Yousf, Nehad; Morsy, Mohamed; Duraia, El‐Shazly M.

doi:10.1007/s10854-022-08681-0

Cited by 15 publications

(5 citation statements)

References 39 publications

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“…The increment in humidity results in a rise in the quantity of hydronium ions (H 3 O + ), which can freely move between adjacent water molecules, leading to a notable reduction in the sensor's resistance [27]. This phenomenon is commonly referred to as the Grotthuss mechanism.…”

Section: Resultsmentioning

confidence: 99%

Large-area, size-controlled and transferable graphene oxide-metal films for humidity sensor

Zhu,

Zhou,

Zhang

et al. 2024

Nanotechnology

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The lack of low-cost methods to synthesize large-area graphene-based materials is still an important factor that limits the practical application of graphene devices. Herein, we present a facile method for producing large-area graphene oxide-metal (GO-M) films, which are size controllable and transferable. The sensor constructed using the GO-M film exhibited humidity sensitivity while being unaffected by pressure. The relationship between the sensor's resistance and relative humidity followed an exponential trend. The GO-Mg sensor was the most sensitive among all the tested sensors. The facile synthesis of GO-M films will accelerate the widespread utilization of graphene-based materials.

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Section: Resultsmentioning

confidence: 99%

Large-area, size-controlled and transferable graphene oxide-metal films for humidity sensor

Zhu,

Zhou,

Zhang

et al. 2024

Nanotechnology

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“…More importantly, the curvature of the developed semicircle increases as the humidity increases. The sensing mechanism can be explained based on the Grotthuss chain reaction 41 , 61 , 62 . At low humidity level the adsorbed water molecules are dissociated on the surface of the sensor to form protons (H + ) and hydroxyl groups (OH − ).…”

Section: Resultsmentioning

confidence: 99%

Design and implementation of humidity sensor based on carbon nitride modified with graphene quantum dots

Morsy

Gomaa

Mokhtar

et al. 2023

Sci Rep

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Relative humidity (RH) is one of the most important factors that deserve intensive study because of its impact on many aspects of life. In this work humidity sensor based on carbon nitride / graphene quantum dots (g-C3N4/GQDs) nanocomposites have been developed. The structure, morphology and composition properties of the g-C3N4/GQDs were investigated and analyzed by XRD, HR-TEM, FTIR, UV–Vis, Raman, XPS and BET surface area. The average particle size of GQDs was estimated from XRD to be 5 nm and confirmed using HRTEM. The HRTEM images prove that the GQDs are attached to the external surface of the g-C3N4. The measured BET surface area was found to be 216 m2/g, 313 m2/g, and 545 m2/g for GQDs, g-C3N4, and g-C3N4/GQDs respectively. The d-spacing and crystallite size were estimated from XRD and HRTEM and found in a good matching. The humidity sensing behavior of g-C3N4/GQDs was measured in a wide span of humidity from 7% up to 97% RH under different testing frequencies. The obtained results demonstrate good reversibility and fast response/recovery time. The implemented sensor exhibits a great application prospect in humidity alarm devices, automatic diaper alarms, and breath analysis, which have advantages such as strong anti-interference capability, low cost, and easy to use.

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“…Since the literature demonstrates that humidity affects the resistance of graphene [26,40,41], tests were performed to verify whether relative humidity (RH) would affect the response of the evaluated sensor. In these tests, the oxygen gas concentration was kept constant at ambient conditions (21% O 2 ).…”

Section: Numerical Simulationmentioning

confidence: 99%

Graphene oxide microstrip antenna-based sensor for oxygen gas sensing in medical applications

do Carmo,

Sales,

Nascimento

et al. 2024

Phys. Scr.

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In this work, we report the development of a new graphene oxide (GO) sensor based on a microstrip antenna for detecting and measuring O2 concentration. GO was prepared from natural graphite powder using a modified Hummers procedure and then deposited upon a phenolic substrate to act as the sensing element of the designed device. Detection tests employing the sensor to evaluate oxygen gas (O2) in higher concentrations were performed, whereas it was observed that the two operating frequencies of the device was displaced to higher values as the concentration oxygen gas increased. The effect of relative humidity (RH) in the response sensor too was observed, whereas the 9.704 GHz mode demonstrating to be the most sensitive to O2 variation after sensitivity values have been corrected, presenting limit of detection (LOD) equal to 0.38%O2. Evaluating the results, it is possible to note that the device studied could be used as sensor in medical equipment operating at elevated oxygen concentrations, such as ventilators, O2 concentrators, and other medical equipment. Moreover, evaluated sensor would be a promisor candidate for healthcare monitoring applications for the reason that this device could act as both an O2 sensor and antenna, and thus transmitting their information to other devices. 

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Flexible humidity sensor based on light-scribed graphene oxide

Cited by 15 publications

References 39 publications

Large-area, size-controlled and transferable graphene oxide-metal films for humidity sensor

Large-area, size-controlled and transferable graphene oxide-metal films for humidity sensor

Design and implementation of humidity sensor based on carbon nitride modified with graphene quantum dots

Graphene oxide microstrip antenna-based sensor for oxygen gas sensing in medical applications

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