High performance room temperature NO2 sensors based on reduced graphene oxide-multiwalled carbon nanotubes-tin oxide nanoparticles hybrids

Liu, Sen; Wang, Ziying; Zhang, Yong; Zhang, Chunbo; Zhang, Tong

doi:10.1016/j.snb.2015.01.127

Cited by 116 publications

(64 citation statements)

References 38 publications

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“…Furthermore room temperature sensing is generating much research interest, in particular combining MOX, CNT and graphene [14], but it generally suffers from slower response times, poor baseline stability, and high humidity dependence.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive WO 3 gas sensors for NO 2 detection in air and low oxygen environment

Urasinska‐Wojcik

Vincent

Chowdhury

et al. 2017

Sensors and Actuators B: Chemical

178

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We report here on the results of a study into the response of a tungsten oxide based low power MEMS gas sensor to ppb of nitrogen dioxide at low levels of ambient oxygen. It was found that the resistive gas sensors not only had a high sensitivity to NO 2 (3.4%/ppb vs. 0.2%/ppb obtained for commercial MOX) but can still operate reliably at lower oxygen levels (down to 0.5 %) albeit with slightly longer response and recovery times. The optimal operating temperature was determined to be ca. 350°C and so easily within the range of a MEMS based SOI CMOS substrate. The response was sensitive to significant changes in ambient humidity, but was found to have low cross-sensitivity to CO, hydrogen, methane, and acetone even at much higher ppm levels. We believe that these tungsten oxide gas sensors could be exploited in harsh applications, i.e. with a low oxygen (lean) environment often associated in the exhaust gases from combustion systems.

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive WO 3 gas sensors for NO 2 detection in air and low oxygen environment

Urasinska‐Wojcik

Vincent

Chowdhury

et al. 2017

Sensors and Actuators B: Chemical

178

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“…The SAED of the 35 nanoparticles is consistent with tetragonal rutile SnO 2 with strong ring patterns due to Figure S7B gives the O1s spectra of all samples. It is noted that the O1s peaks for ICTOs shifted to higher binging energy in comparison with the pristine SnO 2 , which indicates increased 50 chemisorbed oxygen. 30 Figure 3A shows the Sn 3d XPS spectra of the 3ICTO and pristine SnO 2 .…”

Section: Composition and Morphologymentioning

confidence: 96%

“…37 Nevertheless, with the increasing amount of In 2 O 3 , the carrier density of 5ICTO is lower than that of 3ICTO. It is mainly because that adding the proper amount of In 2 O 3 is advantageous to promote the SnO 2 particles distribution around 50 the In 2 O 3 particle, result in forming more heterojunctions. These heterojunctions are equal to the electrons transfer channels, improving electronic transmission.…”

Section: Composition and Morphologymentioning

confidence: 99%

“…Therefore, it will be a worthy research topic to synthesize excellent In 2 O 3 -SnO 2 heterostructural sensing materials at RT. Nitrogen oxides (NO x ) are major air pollutants generated from 50 the reaction of nitrogen and oxygen in the air during combustion processes, such as power plants and automotive engines. They can cause acid rain and photochemical smog, even endanger our life when the NO x concentration exceed 25 ppm.…”

Section: Introductionmentioning

confidence: 99%

“…Currentvoltage characteristics (I ds -V ds ) were performed on ICTOs devices using a Keithley 4200 source meter. I ds -V ds curves of the ICTOs device were measured by ramping drain-source voltage 50 V ds and simultaneously by recording drain-source current I ds (the gate voltage V g =0.1). The diagram of the I ds -V ds measurement device is shown in Figure S1.…”

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confidence: 99%

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Role of the heterojunctions in In₂O₃-composite SnO₂nanorod sensors and their remarkable gas-sensing performance for NO_xat room temperature

et al. 2015

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Establishing heterostructures, as a good strategy to improve gas sensing performance, has been studied extensively. In this research, In2O3-composite SnO2 nanorod (ICTOs) heterostructures have been prepared via electrospinning, followed by calcination. It is found that In2O3 can improve the carrier density and oxygen deficiency of SnO2. In particular, the 3ICTO (Sn : In atom ratio of 25 : 0.3) nanorods with special particle distributions show an excellent sensing response towards different concentrations of NOx at room temperature. The highest sensing response is up to 8.98 for 100 ppm NOx with a fast response time of 4.67 s, which is over 11 times higher than that of pristine SnO2 nanorods at room temperature and the lowest detection limit is down to 0.1 ppm. More significantly, it presents good stability after 30 days for NOx of low concentration (0.1 ppm and 0.5 ppm). In addition, the rational band structure model combined with the surface depletion model which describe the NOx gas sensing mechanism of 3ICTO are presented. The 3ICTO nanorods may be promising in the application of gas sensors.

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Graphene in Sensors Design

Cernat

Tertiş

Fritea

et al. 2016

Advanced 2D Materials

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High performance room temperature NO2 sensors based on reduced graphene oxide-multiwalled carbon nanotubes-tin oxide nanoparticles hybrids

Cited by 116 publications

References 38 publications

Ultrasensitive WO 3 gas sensors for NO 2 detection in air and low oxygen environment

Ultrasensitive WO 3 gas sensors for NO 2 detection in air and low oxygen environment

Role of the heterojunctions in In₂O₃-composite SnO₂nanorod sensors and their remarkable gas-sensing performance for NO_xat room temperature

Graphene in Sensors Design

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High performance room temperature NO2 sensors based on reduced graphene oxide-multiwalled carbon nanotubes-tin oxide nanoparticles hybrids

Cited by 116 publications

References 38 publications

Ultrasensitive WO 3 gas sensors for NO 2 detection in air and low oxygen environment

Ultrasensitive WO 3 gas sensors for NO 2 detection in air and low oxygen environment

Role of the heterojunctions in In2O3-composite SnO2nanorod sensors and their remarkable gas-sensing performance for NOxat room temperature

Graphene in Sensors Design

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Role of the heterojunctions in In₂O₃-composite SnO₂nanorod sensors and their remarkable gas-sensing performance for NO_xat room temperature