Impact of Doping on GO: Fast Response–Recovery Humidity Sensor

Rathi, K. S.; Pal, Kaushik

doi:10.1021/acsomega.6b00399

Cited by 80 publications

(39 citation statements)

References 39 publications

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“…For selective sensitivity the surface can be modified by catalyst particles or chemical agents to enhance charge transfer from detecting agent to GO layer. It was successfully demonstrated GO is good sensor for hydrogen [122], nitrogen dioxide [123], humidity [124,125].…”

Section: Sensors For Chemistry and Biologymentioning

confidence: 99%

Graphene Oxide and Derivatives: The Place in Graphene Family

2019

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Graphene oxide (GO) is useful and promising material for graphene based applications in electronic, optics, chemistry, energy storage, and biology. At the beginning of graphene history GO was only a simple and cheap step for preparation of single and multilayer graphene films and bulk structures by reduction. The further studies revealed the substantial structure imperfection of graphene oxide derived materials due to the defects in initial graphite and incompletion of reducing process. However, the results of recent research demonstrated a great amount of unique chemical, optical and electronic properties of graphene oxide that allow regarding it as independent nanomaterial possessing a large area of applications. In general, it represents the ultra-large organic molecule containing 2D carbon mesh. Unlike conventional graphene it provides wide range of chemical methods for attachment of various functional groups to its surface for control optical transparency, electrical and thermal conductance. Recently developed methods for preparation of graphene oxide derivatives saturated by carboxyl groups open the new attractive application areas in green technologies including energy storage and utilizing nuclear wastes. The goal of the review is to summarize the results of recent studies of graphene oxide, derivatives and reveal the most promising directions to focus the efforts of researchers.

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Section: Sensors For Chemistry and Biologymentioning

confidence: 99%

Graphene Oxide and Derivatives: The Place in Graphene Family

2019

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“…They proposed that the enhanced sensitivity and the hysteresis of these sensors were based on the molecular interactions between the increased water and charged groups in GO at high pH, suggesting a trade-off relationship between sensitivity and hysteresis. In addition, various approaches have been employed to improve the sensing performance or application area of GO based humidity sensors, such as free-standing GO foam to increase the active site [120], ultralarge GO to improve the overall proton conductivity [121], silk fiber coated with GO to take advantage of silk fiber’s flexibility [122], computer-aided design [123], investigation of the influence of the structure and coating methods [124], heteroatom-doping on GO to improve the response [125], as well as microstructure related synergic sensing for high-performance humidity sensors [126].…”

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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“…Lv et al demonstrated substantially improved sensitivity of boron‐doped graphene toward toxic vapors such as nitrogen dioxide and ammonia . In addition, Rathi and Pal synthesized Li‐doped GO and proved the excellent sensitivity toward humidity with fast response and recovery times …”

Section: Introductionmentioning

confidence: 99%

“…[14] In addition, Rathi and Pal synthesized Li-doped GO and proved the excellent sensitivity toward humidity with fast response and recovery times. [15] Recently, 1D fibrous graphene is gaining much interest with regard to versatile applications in wearable textiles. [16,17] As a new type of carbonaceous fiber, 1D graphene fiber is also highly advantageous for application in vapor detection since the fibers can provide high porosity for vapor adsorption on the surface.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐Doped Single Graphene Fiber with Platinum Water Dissociation Catalyst for Wearable Humidity Sensor

Choi

Jang

et al. 2018

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117

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Humidity sensors are essential components in wearable electronics for monitoring of environmental condition and physical state. In this work, a unique humidity sensing layer composed of nitrogen-doped reduced graphene oxide (nRGO) fiber on colorless polyimide film is proposed. Ultralong graphene oxide (GO) fibers are synthesized by solution assembly of large GO sheets assisted by lyotropic liquid crystal behavior. Chemical modification by nitrogen-doping is carried out under thermal annealing in H (4%)/N (96%) ambient to obtain highly conductive nRGO fiber. Very small (≈2 nm) Pt nanoparticles are tightly anchored on the surface of the nRGO fiber as water dissociation catalysts by an optical sintering process. As a result, nRGO fiber can effectively detect wide humidity levels in the range of 6.1-66.4% relative humidity (RH). Furthermore, a 1.36-fold higher sensitivity (4.51%) at 66.4% RH is achieved using a Pt functionalized nRGO fiber (i.e., Pt-nRGO fiber) compared with the sensitivity (3.53% at 66.4% RH) of pure nRGO fiber. Real-time and portable humidity sensing characteristics are successfully demonstrated toward exhaled breath using Pt-nRGO fiber integrated on a portable sensing module. The Pt-nRGO fiber with high sensitivity and wide range of humidity detection levels offers a new sensing platform for wearable humidity sensors.

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Impact of Doping on GO: Fast Response–Recovery Humidity Sensor

Cited by 80 publications

References 39 publications

Graphene Oxide and Derivatives: The Place in Graphene Family

Graphene Oxide and Derivatives: The Place in Graphene Family

Recent Advances in Graphene-Based Humidity Sensors

Nitrogen‐Doped Single Graphene Fiber with Platinum Water Dissociation Catalyst for Wearable Humidity Sensor

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