MXene/SnO2 heterojunction based chemical gas sensors

•Composite of tin oxide-reduced MXene was hydrothermally synthesized.•The obtained n-type response composite based sensor exhibits a higher and more stable response to NH3 than pure MXene at room temperature.•Formation of heterojunction could introduce extra electrons yielding out more active sites...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2021-02, Vol.329, p.129275, Article 129275
Main Authors: He, Tingting, Liu, Wei, Lv, Tan, Ma, Mingsheng, Liu, Zhifu, Vasiliev, Alexey, Li, Xiaogan
Format: Article
Language:English
Subjects:
2D MXene
Ammonia
Ammonia sensors
Charge transfer
Chemical sensors
Gas sensors
Heterojunctions
LC wireless sensor
Low temperature
MXene/SnO2 heterojunctions
MXenes
Nanoparticles
Resonant frequencies
Room temperature
Selective adsorption
Selectivity
Sensitivity enhancement
Sensors
Synthesis
Tin dioxide
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Summary:•Composite of tin oxide-reduced MXene was hydrothermally synthesized.•The obtained n-type response composite based sensor exhibits a higher and more stable response to NH3 than pure MXene at room temperature.•Formation of heterojunction could introduce extra electrons yielding out more active sites for NH3 adsorptions.•The use of as-synthesized MXene/SnO2 heterojunctions in wireless LC sensors have greatly promoted the response/recovery to NH3. Two dimensional (2D) MXene decorated by the SnO2 nanoparticles has been successfully synthesized by the hydrothermal method. The formed MXene/SnO2 heterojunction based chemirestistive-type sensors exhibit an excellent sensitivity and selectivity to different concentrations of NH3 from 0.5 to 100 ppm at room temperature. The enhanced sensing properties can be attributed to two major factors. On one hand, 2D MXene provides a matrix which has a unique, selective adsorption ability to ammonia and good conductivity that makes the room-temperature sensing of the heterojunction based sensor feasible. On the other hand, the difference in the Fermi level of the 2D MXene and SnO2 drives the charge transfer at the interface of the heterojunctions enriching the electrons on the surface region of SnO2 and consequently enhancing the sensitivity. Furthermore, a wireless sensor made from an inductor-capacitor (LC) antenna and the as-synthesized MXene/SnO2 heterojunctions fabricated by the low-temperature-cofired ceramic technique (LTCC) was preliminary investigated. The wireless sensor shows a even faster response/recovery speeds (
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.129275