Ultra-high sensitive and selective H2 gas sensor manifested by interface of n–n heterostructure of CeO2-SnO2 nanoparticles

Motaung, David E.; Mhlongo, G.H.; Makgwane, Peter R.; Dhonge, Baban P.; Cummings, Franscious; Swart, H.C.; Ray, Suprakas Sinha

doi:10.1016/j.snb.2017.07.093

Cited by 194 publications

(67 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yang and co-works reported an ultrafast response/recovery time (0.9/1.5 s) towards trimethylamine gas through the preparation of snowflake-like α-Fe 2 O 3 hierarchical architectures [20]. Besides the fabrication of the 3D hierarchical structure of MOS, the combination of two different nanomaterials to construct a heterostructure has also been testified to be an effective method to ameliorate gas sensing performance [21]. Many previous studies have demonstrated that heterostructured MOS materials can exhibit improved gas sensing properties as compared with their pure phase counterpart due to the synthetic effect between different sensitive materials [21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Besides the fabrication of the 3D hierarchical structure of MOS, the combination of two different nanomaterials to construct a heterostructure has also been testified to be an effective method to ameliorate gas sensing performance [21]. Many previous studies have demonstrated that heterostructured MOS materials can exhibit improved gas sensing properties as compared with their pure phase counterpart due to the synthetic effect between different sensitive materials [21,22,23,24]. Yang et al reported the synthesis of branched SnO 2 /ZnO heterostructures and their highly enhanced ethanol gas sensing performance [22].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of a Flower-Like g-C3N4/ZnO Hierarchical Structure with Improved CH4 Sensing Properties

Sun

et al. 2019

Nanomaterials

View full text Add to dashboard Cite

In this paper, a hierarchical structure of graphite carbon nitride (g-C3N4) modified ZnO (g-C3N4/ZnO) was synthesized using a simple precipitation-calcination method. Through this method, g-C3N4 nanosheets with a controlled content were successfully decorated on the petals of flower-like ZnO. Various techniques were used to confirm the successful formation of the g-C3N4/ZnO hierarchical structure. The methane (CH4) sensing properties of g-C3N4/ZnO sensor were investigated. The result exhibited that after decorating ZnO with g-C3N4, the CH4 sensing performances of the fabricated sensor were remarkably improved. At the optimum operating temperature of 320 °C, the response of the sensor fabricated with CNZ-3 (the sample with an optimum content of g-C3N4) towards 1000 ppm CH4 was as high as 11.9 (Ra/Rg), which was about 2.2 times higher than that of the pure ZnO sensor (5.3). In addition, the CNZ-3 sensor also exhibited a fast response/recovery speed (15/28 s) and outstanding long-term stability. The enhancing CH4 sensing mechanism may be contributed to enlarged surface area, pore structure, and g-C3N4-ZnO n-n junction.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of a Flower-Like g-C3N4/ZnO Hierarchical Structure with Improved CH4 Sensing Properties

Sun

et al. 2019

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Therefore, a heterojunction can be classified as a homogeneous heterojunction (n-n heterojunction and p-p heterojunction) and heteromorphic heterojunction (p-n heterojunction). Heterojunctions may occur in various structures, such as nanoparticles [145], nanosheets [146], flower-like hollow microspheres [147], core-shell structured nanofibers [148]/nanorods [149]/nanoneedles [150], etc.…”

Section: Forming the Heterojunctionmentioning

confidence: 99%

Approaches to Enhancing Gas Sensing Properties: A Review

Yuan

Meng

et al. 2019

Sensors

111

View full text Add to dashboard Cite

A gas nanosensor is an instrument that converts the information of an unknown gas (species, concentration, etc.) into other signals (for example, an electrical signal) according to certain principles, combining detection principles, material science, and processing technology. As an effective application for detecting a large number of dangerous gases, gas nanosensors have attracted extensive interest. However, their development and application are restricted because of issues such as a low response, poor selectivity, and high operation temperature, etc. To tackle these issues, various measures have been studied and will be introduced in this review, mainly including controlling the nanostructure, doping with 2D nanomaterials, decorating with noble metal nanoparticles, and forming the heterojunction. In every section, recent advances and typical research, as well mechanisms, will also be demonstrated.

show abstract

“…Thermal and electrical faults in oil-filled power transformers may produce typical fault characteristic gases including hydrogen H 2 (David et al, 2018), carbon monoxide CO (Joseph, 1980; Uddin et al, 2016; Zhou et al, 2018b), carbon dioxide CO 2 (2015; Dan et al, 2016; Iwata et al, 2017; Zhang et al, 2017), methane CH 4 (Sedghi et al, 2010), acetylene C 2 H 2 (Qi et al, 2008), ethylene C 2 H 4 , and ethane C 2 H 6 . These typical fault characteristic gases could be dissolved in transformer oil or accumulate as free gases if produced rapidly in large quantities.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances of SnO2-Based Sensors for Detecting Fault Characteristic Gases Extracted From Power Transformer Oil

Zhang

Zhou

et al. 2018

Front. Chem.

View full text Add to dashboard Cite

Tin oxide SnO2-based gas sensors have been widely used for detecting typical fault characteristic gases extracted from power transformer oil, namely, H2, CO, CO2, CH4, C2H2, C2H4, and C2H6, due to the remarkable advantages of high sensitivity, fast response, long-term stability, and so on. Herein, we present an overview of the recent significant improvement in fabrication and application of high performance SnO2-based sensors for detecting these fault characteristic gases. Promising materials for the sensitive and selective detection of each kind of fault characteristic gas have been identified. Meanwhile, the corresponding sensing mechanisms of SnO2-based gas sensors of these fault characteristic gases are comprehensively discussed. In the final section of this review, the major challenges and promising developments in this domain are also given.

show abstract

Ultra-high sensitive and selective H2 gas sensor manifested by interface of n–n heterostructure of CeO2-SnO2 nanoparticles

Cited by 194 publications

References 58 publications

Synthesis of a Flower-Like g-C3N4/ZnO Hierarchical Structure with Improved CH4 Sensing Properties

Synthesis of a Flower-Like g-C3N4/ZnO Hierarchical Structure with Improved CH4 Sensing Properties

Approaches to Enhancing Gas Sensing Properties: A Review

Recent Advances of SnO2-Based Sensors for Detecting Fault Characteristic Gases Extracted From Power Transformer Oil

Contact Info

Product

Resources

About