High‐Performance NO<sub>2</sub> Sensors Based on Chemically Modified Graphene

Yuan, Wenjing; Liu, Anran; Huang, Liang; Li, Chun; Shi, Gaoquan

doi:10.1002/adma.201203172

Cited by 414 publications

(324 citation statements)

References 41 publications

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“…Since the pioneering work reported the capability of Gr to detect a single NO 2 molecule,12 Gr materials fabricated via various strategies, such as mechanical exfoliation,12, 13, 14 chemical vapor deposition,1, 9, 15, 16 epitaxial growth,17 and chemically18, 19, 20, 21 or thermally22 reduced graphene oxide (RGO) have been exploited for gas sensing. Among them, RGO has attracted widespread attention for this purpose due to the low cost and high yield in production, and the convenience of modifying it with functional groups or doping atoms to tailor its gas sensing properties 19, 23. However, the practical application of unmodified RGO sensor is hindered by low sensitivity, slow response, and poor recovery at room temperature 19, 24…”

Section: Introductionmentioning

confidence: 99%

“…Among them, RGO has attracted widespread attention for this purpose due to the low cost and high yield in production, and the convenience of modifying it with functional groups or doping atoms to tailor its gas sensing properties 19, 23. However, the practical application of unmodified RGO sensor is hindered by low sensitivity, slow response, and poor recovery at room temperature 19, 24…”

Section: Introductionmentioning

confidence: 99%

“…Chemical modification of Gr/RGO is an effective strategy to boost gas detection, including increased sensitivity, accelerated response, recovery, and lowered limit of detection (LOD) 11, 19, 25. For instance, a theoretical study (first‐principle calculations) shows that S‐doped Gr is able to chemically bind to NO 2 molecules strongly because S‐doped Gr shows much higher adsorption energy with NO 2 molecules than undoped Gr 26.…”

Section: Introductionmentioning

confidence: 99%

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A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

et al. 2016

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Reduced graphene oxide (RGO) has proved to be a promising candidate in high‐performance gas sensing in ambient conditions. However, trace detection of different kinds of gases with simultaneously high sensitivity and selectivity is challenging. Here, a chemiresistor‐type sensor based on 3D sulfonated RGO hydrogel (S‐RGOH) is reported, which can detect a variety of important gases with high sensitivity, boosted selectivity, fast response, and good reversibility. The NaHSO3 functionalized RGOH displays remarkable 118.6 and 58.9 times higher responses to NO2 and NH3, respectively, compared with its unmodified RGOH counterpart. In addition, the S‐RGOH sensor is highly responsive to volatile organic compounds. More importantly, the characteristic patterns on the linearly fitted response–temperature curves are employed to distinguish various gases for the first time. The temperature of the sensor is elevated rapidly by an imbedded microheater with little power consumption. The 3D S‐RGOH is characterized and the sensing mechanisms are proposed. This work gains new insights into boosting the sensitivity of detecting various gases by combining chemical modification and 3D structural engineering of RGO, and improving the selectivity of gas sensing by employing temperature dependent response characteristics of RGO for different gases.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

et al. 2016

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“…Besides, the rGO‐based gas sensor could also selectively detect corrosive vapors such as NO 2 and Cl 2 after reduced by ascorbic acid, whose limit of detection (LOD) was up to the range of 100 ppm to 500 ppb 114. Sulfonated rGO and ethylenediamine‐modified rGO (EDA–G) were also prepared and exhibited higher response of 4 to 16 times toward NO 2 than the pristine rGO 115. However, it is regrettable that the recovery of the sensor was relatively slower than the pristine graphene due to the strong interactions of detected molecules with graphene.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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Humans have numerous senses, wherein vision, hearing, smell, taste, and touch are considered as the five conventionally acknowledged senses. Triggered by light, sound, or other physical stimulations, the sensory organs of human body are excited, leading to the transformation of the afferent energy into neural activity. Also converting other signals into electronical signals, graphene‐based film shows its inherent advantages in responding to the tiny stimulations. In this review, the human‐like senses and reflexes of graphene‐based films are presented. The review starts with the brief discussions about the preparation and optimization of graphene‐based film, as where as its new progress in synthesis method, transfer operation, film‐formation technologies and optimization techniques. Various human‐like senses of graphene‐based film and their recent advancements are then summarized, including light‐sensitive devices, acoustic devices, gas sensors, biomolecules and wearable devices. Similar to the reflex action of humans, graphene‐based film also exhibits reflex when under thermal radiation and light actuation. Finally, the current challenges associated with human‐like applications are discussed to help guide the future research on graphene films. At last, the future opportunities lie in the new applicable human‐like senses and the integration of multiple senses that can raise a revolution in bionic devices.

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“…Jeong et al prepared CNT/reduced graphene hybrid films exhibiting RT NO 2 ‐gas‐sensing properties attributed to the high specific area of the hybrid composite film 16. Yuan et al prepared chemically modified graphene and demonstrated its RT sensitivity to NO 2 gas, which is attributed to its high carrier mobility and large specific surface 17. However, the practical application of these gas sensors is impeded by some fundamental issues.…”

Section: Introductionmentioning

confidence: 99%

Morphology‐Controlled Aluminum‐Doped Zinc Oxide Nanofibers for Highly Sensitive NO₂ Sensors with Full Recovery at Room Temperature

et al. 2018

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Room‐temperature (RT) gas sensitivity of morphology‐controlled free‐standing hollow aluminum‐doped zinc oxide (AZO) nanofibers for NO2 gas sensors is presented. The free‐standing hollow nanofibers are fabricated using a polyvinylpyrrolidone fiber template electrospun on a copper electrode frame followed by radio‐frequency sputtering of an AZO thin overlayer and heat treatment at 400 °C to burn off the polymer template. The thickness of the AZO layer is controlled by the deposition time. The gas sensor based on the hollow nanofibers demonstrates fully recoverable n‐type RT sensing of low concentrations of NO2 (0.5 ppm). A gas sensor fabricated with Al2O3‐filled AZO nanofibers exhibits no gas sensitivity below 75 °C. The gas sensitivity of a sensor is determined by the density of molecules above the minimum energy for adsorption, collision frequency of gas molecules with the surface, and available adsorption sites. Based on finite‐difference time‐domain simulations, the RT sensitivity of hollow nanofiber sensors is ascribed to the ten times higher collision frequency of NO2 molecules confined inside the fiber compared to the outer surface, as well as twice the surface area of hollow nanofibers compared to the filled ones. This approach might lead to the realization of RT sensitive gas sensors with 1D nanostructures.

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High‐Performance NO₂ Sensors Based on Chemically Modified Graphene

Cited by 414 publications

References 41 publications

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Morphology‐Controlled Aluminum‐Doped Zinc Oxide Nanofibers for Highly Sensitive NO₂ Sensors with Full Recovery at Room Temperature

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High‐Performance NO2 Sensors Based on Chemically Modified Graphene

Cited by 414 publications

References 41 publications

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Morphology‐Controlled Aluminum‐Doped Zinc Oxide Nanofibers for Highly Sensitive NO2 Sensors with Full Recovery at Room Temperature

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Product

Resources

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High‐Performance NO₂ Sensors Based on Chemically Modified Graphene

Morphology‐Controlled Aluminum‐Doped Zinc Oxide Nanofibers for Highly Sensitive NO₂ Sensors with Full Recovery at Room Temperature