Supramolecularly Modified Graphene for Ultrafast Responsive and Highly Stable Humidity Sensor

Wang, Shiwei; Chen, Zhuo; Umar, Ahmad; Wang, Yao; Tong, Tian; Shang, Ying; Fan, Yuzun; Qi, Qi; Xu, Dongmei

doi:10.1021/acs.jpcc.5b08771

Cited by 58 publications

(36 citation statements)

References 45 publications

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“…Another explanation is the formation of electron charge carrier traps by dissociation of water molecules into hydronium ions (H 3 O + ). Water molecules are readily dissociated by forming proton (H + ) and hydroxide ion (OH − ) . Under the sufficient water molecules, hydronium ions are easily formed by protonation of another water molecule .…”

Section: Resultsmentioning

confidence: 99%

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

Choi

Jang

et al. 2018

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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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Section: Resultsmentioning

confidence: 99%

“…Water molecules are readily dissociated by forming proton (H + ) and hydroxide ion (OH − ) . Under the sufficient water molecules, hydronium ions are easily formed by protonation of another water molecule . The n RGO fiber exhibits n ‐type property with majority charge carriers of electrons due to n ‐type dopant of nitrogen .…”

Section: Resultsmentioning

confidence: 99%

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

Choi

Jang

et al. 2018

Small

113

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“…In addition, modified doped graphene (GO) sensors have fast response to humidity due to GO's high charge carrier mobility and content of surface defects and residual oxygen-containing groups (carboxyl, epoxy, hydroxyl, etc.) [10][11][12][13]. Wearable electronic textile humidity sensors based on carbon nanotubes and composite fibers have also been developed [14,15].…”

Section: Introductionmentioning

confidence: 99%

Human Respiratory Monitoring Based on Schottky Resistance Humidity Sensors

et al. 2020

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Two types of Schottky structure sensors (silicon nanowire (SiNW)/ZnO/reduced graphene oxide (rGO) and SiNW/TiO2/rGO) were designed, their humidity resistance characteristics were studied, and the sensors were applied to detect sleep apnea through breath humidity monitoring. The results show that the resistance of the sensors exhibited significant changes with increasing humidity, the response times of the two sensors within the relative humidity range of 23–97% were 49 s and 67 s, and the recovery times were 24 s and 43 s, respectively. Meanwhile, continuous breathing monitoring results indicate that the sensitivity of the sensors remained basically unchanged during 10 min of normal breathing and simulated apnea. The response of the sensor is still good after 30 days of use. We believe that the Schottky structure composite sensor is a very promising technology for human breathing monitoring.

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“…Lu et al 22 fabricated Ag nanowires with DNA as a template and reported that the Ag-DNA network showed a current increase of more than 400%. Wang et al 23 fabricated sensors based on NAgraphene modied with Ag nanoparticles, which showed a fast response speed ($1 second). Therefore, the combination of Ag and GO could be expected to create new functional nanocomposites with excellent humidity sensing properties.…”

Section: Introductionmentioning

confidence: 99%