Graphene-wrapped WO3 nanospheres with room-temperature NO2 sensing induced by interface charge transfer

Graphene (GR)-wrapped WO3 nanosphere composite was synthesized by using a facile sol–gel method. The morphology and structural properties of the GR-WO3 nanocomposites were characterized by field-emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), transmission electron micr...

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Published inSensors and actuators. B, Chemical Vol. 220; pp. 201 - 209
Main Authors Jie, Xiaoqin, Zeng, Dawen, Zhang, Jian, Xu, Keng, Wu, Jinjin, Zhu, Baokun, Xie, Changsheng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2015
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Abstract Graphene (GR)-wrapped WO3 nanosphere composite was synthesized by using a facile sol–gel method. The morphology and structural properties of the GR-WO3 nanocomposites were characterized by field-emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. The GR-wrapped WO3 nanospheres composite exhibits p-type gas sensing behavior and the response of GR-WO3 sensor toward NO2 shows a linear increase with an increase in the concentration from 7 to 56ppm at room temperature. Upon exposure to 56ppm NO2, its response value becomes 40.8%, but there is no responsiveness for the sensors based on pure WO3 and graphene sensors. The effective charge transfer through chemically bonded interfacial contact between graphene and WO3 nanospheres is proposed to be responsible for the room temperature sensing performance. This work may provide a new insight into the structural design of GR-base nanocomposites and has a potential prospect in the environment monitoring or disease detection of NO2 at room temperature.
AbstractList Graphene (GR)-wrapped WO3 nanosphere composite was synthesized by using a facile sol–gel method. The morphology and structural properties of the GR-WO3 nanocomposites were characterized by field-emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. The GR-wrapped WO3 nanospheres composite exhibits p-type gas sensing behavior and the response of GR-WO3 sensor toward NO2 shows a linear increase with an increase in the concentration from 7 to 56ppm at room temperature. Upon exposure to 56ppm NO2, its response value becomes 40.8%, but there is no responsiveness for the sensors based on pure WO3 and graphene sensors. The effective charge transfer through chemically bonded interfacial contact between graphene and WO3 nanospheres is proposed to be responsible for the room temperature sensing performance. This work may provide a new insight into the structural design of GR-base nanocomposites and has a potential prospect in the environment monitoring or disease detection of NO2 at room temperature.
Author Zeng, Dawen
Zhang, Jian
Zhu, Baokun
Jie, Xiaoqin
Xu, Keng
Wu, Jinjin
Xie, Changsheng
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Keywords NO2
GR-WO3 nanocomposites
WO3
Gas sensing
Room temperature
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Snippet Graphene (GR)-wrapped WO3 nanosphere composite was synthesized by using a facile sol–gel method. The morphology and structural properties of the GR-WO3...
Graphene (GR)-wrapped WO3 nanosphere composite was synthesized by using a facile sol-gel method. The morphology and structural properties of the GR-WO3...
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SubjectTerms Charge transfer
Detection
Gas sensing
GR-WO3 nanocomposites
Graphene
Nanospheres
Nitrogen dioxide
NO2
Room temperature
Scanning electron microscopy
Sensors
Tungsten oxides
WO3
Title Graphene-wrapped WO3 nanospheres with room-temperature NO2 sensing induced by interface charge transfer
URI https://dx.doi.org/10.1016/j.snb.2015.05.047
https://search.proquest.com/docview/1786163530
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