Sensitivity Modelling of Graphene Nanoscroll-Based NO2 Gas Sensors

Khaledian, Mohsen; Ismail, Razali; Saeidmanesh, Mehdi; Ghadiry, Mahdiar; Akbari, Elnaz

doi:10.1007/s11468-015-9905-6

Cited by 13 publications

(5 citation statements)

References 64 publications

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“…An approach has been developed for highly efficient transformation of 2D graphene oxide sheet into 1D GNS with high specific surface area to utilize as a porous cathode scaffold for encapsulating sulfur with a high loading, and also as a conductive skeleton for assembling MnO2 nanowires into a flexible freestanding hybrid interlayer, both enabling high-rate and long-life Li-S battery [71]. The effect of gas adsorption on GNS surface makes the changes in GNS conductance which leads to the changes in the current of sensor consequently [72,73]. GNS are promising for making high-quality supercapacitors [74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Graphene nanoribbon winding around carbon nanotube

Savin¹,

Korznikova

Soboleva

2017

Computational Materials Science

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Section: Introductionmentioning

confidence: 99%

Graphene nanoribbon winding around carbon nanotube

Savin¹,

Korznikova

Soboleva

2017

Computational Materials Science

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“…However, organic sensors generally suffer from instability in terms of performance because they show high response and recovery times. In general, using nanoscale coating results in an increase in the sensitivity and response time of the sensors due to the high surface area of the coating material compared to its thickness [ 13 , 14 ]. However, the fabrication process is normally difficult and requires expensive machines.…”

Section: Introductionmentioning

confidence: 99%

Nano-Anatase TiO2 for High Performance Optical Humidity Sensing on Chip

Ghadiry

Gholami

Kong

et al. 2015

Sensors

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An on-chip optical humidity sensor using Nano-anatase TiO2 coating is presented here. The coating material was prepared so that the result is in solution form, making the fabrication process quick and simple. Then, the solution was effortlessly spin-coated on an SU8 straight channel waveguide. Investigating the sensitivity and performance (response time) of the device revealed a great linearity in the wide range (35% to 98%) of relative humidity (RH). In addition, a variation of more than 14 dB in transmitted optical power was observed, with a response time of only ~0.7 s. The effect of coating concentration and UV treatment was examined on the performance and repeatability of the sensor. Interesting observations were found, and the attributed mechanisms were described. In addition, the proposed sensor was extensively compared with other state-of-the-art proposed counterparts from the literature and remarkable advantages were found. Since a high sensitivity of ~0.21 dB/%RH and high dynamic performances were demonstrated, this sensor is proposed for use in biomedical applications.

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“…It was further shown that the adsorbed molecules change the local carrier concentration in graphene one by one electron, which leads to step-like changes in resistance. In another study, it was observed that when graphene-gas sensor is exposed to NO 2 gas molecules, the carrier concentration of graphene is changed which leads to the changes in the conductance, and consequently, in the current, this phenomenon is considered as sensing mechanism [61]. Based on this mechanism, Lu et al [62] showed that the sensing behavior of the RGO was dependent on its electrical conductance.…”

Section: Sensing Propertymentioning

confidence: 99%

A Two-Step Method for the Preparation of Highly Conductive Graphene Film and Its Gas-Sensing Property

City¹,

Hanoi²,

Documents³

et al. 2015

MSA

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In this research, a highly conductive graphene film was synthesized through the chemical reduction of graphene oxide (RGO) nanosheets followed by thermal treatment at 1100˚C (RGO-1100˚C) under H2 ambient. The as-prepared graphene films were characterized by using X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy, X-ray diffractions, raman spectroscopy, transmission electron microscopy, scanning electron microscopy, atomic force microscopy and by electrical conductivity measurements. The results showed that the thermal treatment efficiently removed residual oxygen-containing functional groups on the surface of the RGO sheets and simultaneously restored the sp 2 carbon networks in the graphene sheets. As a result, the electrical conductivity of RGO-1100˚C (~210 S/cm) film was greatly improved compared with that of RGO (~24 S/cm) and graphene oxide (4.2 × 10 −4 S/m) films. In addition, the NO2 gas sensing characteristics of the as-prepared RGO films were studied. The results indicated that RGO films were highly responsive to NO2 at temperature of 200˚C.

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Sensitivity Modelling of Graphene Nanoscroll-Based NO2 Gas Sensors

Cited by 13 publications

References 64 publications

Graphene nanoribbon winding around carbon nanotube

Graphene nanoribbon winding around carbon nanotube

Nano-Anatase TiO2 for High Performance Optical Humidity Sensing on Chip

A Two-Step Method for the Preparation of Highly Conductive Graphene Film and Its Gas-Sensing Property

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