Decoration of vertical graphene with tin dioxide nanoparticles for highly sensitive room temperature formaldehyde sensing

[Display omitted] •Performance of VG based gas sensor for formaldehyde detection was first reported.•The VG/SnO2 nanohybrids was obtained by chronoamperometry.•The low detection limit of 0.02ppm for formaldehyde was obtained at room temperature.•The synergistic effect between VG and the SnO2 nanopar...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-03, Vol.256, p.1011-1020
Main Authors: Bo, Zheng, Yuan, Mu, Mao, Shun, Chen, Xia, Yan, Jianhua, Cen, Kefa
Format: Article
Language:English
Subjects:
Aldehydes
Decoration
Detection
Dioxides
Formaldehyde
Gas sensor
Gases
Graphene
High sensitivity
Microwave plasmas
Nanoparticles
Organic chemistry
Plasma enhanced chemical vapor deposition
Recovery time
Response time
Room temperature
Sensors
Stability analysis
Synergistic effect
Temperature
Tin dioxide
Vertical graphene
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Summary:[Display omitted] •Performance of VG based gas sensor for formaldehyde detection was first reported.•The VG/SnO2 nanohybrids was obtained by chronoamperometry.•The low detection limit of 0.02ppm for formaldehyde was obtained at room temperature.•The synergistic effect between VG and the SnO2 nanoparticles were unveiled. A room temperature formaldehyde sensor with high sensitivity is fabricated using vertical graphene (VG) networks decorated with tin dioxide (SnO2) nanoparticles. VG was directly grown on the sensor electrodes using a microwave plasma-enhanced chemical vapor deposition (MW-PECVD) method. SnO2 nanoparticles were decorated on the VG side planes and edges sparsely and evenly with an electrochemical deposition method. The VG/SnO2 sensor exhibited high responses to low-concentration formaldehyde under room temperature. The low limit of detection (LOD) of VG/SnO2 sensor for formaldehyde sensing is 0.02ppm. The response time and recovery time were 46s and 95s for 5ppm formaldehyde, respectively. Moreover, the sensor showed excellent selectivity and stability. The mechanism responsible for good sensing performance was analyzed based on the special structure of VG and the synergistic effect between VG and the SnO2 nanoparticles.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2017.10.043