2d nanomaterials
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Nano Express ◽  
2021 ◽  
Author(s):  
Vijendra Singh Bhati ◽  
Vishakha Takhar ◽  
Ramesh Raliya ◽  
Mahesh Kumar ◽  
Rupak Banerjee

Abstract In recent years, many 2D nanomaterials like graphene, MoS2, phosphorene, and metal oxide nanosheets have been investigated for gas sensing applications due to their excellent properties. Amongst other 2D nanomaterials, graphitic carbon nitride (g-C3N4) has attracted significant attention owing to its simple synthesis process, tunable electronic properties, and exceptional physicochemical properties. Such remarkable properties assert g-C3N4 as a potential candidate for the next-generation high-performance gas sensors employed in the detection of toxic and flammable gases. Although several articles and reviews are available on g-C3N4 for their synthesis, functionalities, and applications for the detection of humidity. Few of them has focused their attention on gas sensing using g-C3N4. Thus, in this review, we have methodically summed up the recent advances in g-C3N4 and its composites-based gas sensor for the detection of toxic and flammable gases. Moreover, we have also incorporated the synthesis strategies and the comprehensive physics of g-C3N4 based gas sensors. Additionally, different approaches are presented for the enhancement of gas sensing/detecting properties of g-C3N4 based gas sensors. Finally, the challenges and future scope of g-C3N4 based gas sensors for real-time monitoring of gases have been discussed.


2021 ◽  
pp. 2101622
Author(s):  
Max Marian ◽  
Diana Berman ◽  
Alberto Rota ◽  
Robert L. Jackson ◽  
Andreas Rosenkranz

2021 ◽  
Author(s):  
zongkun chen ◽  
Ralf Schmid ◽  
Xingkun Wang ◽  
Mengqi Fu ◽  
Zhongkang Han ◽  
...  

Abstract Two-dimensional (2D) materials prepared by a wet-chemical precipitation route exhibit many unique properties and high potential in various fields. Still, simple, rational and green fabrication of target materials remains challenging due to the lack of a guiding principle. Here, we propose a universal qualitative model for 2D materials grown for layered and non-layered crystal structures by wet-chemical precipitation, which is confirmed by both theoretical simulation and experimental results. It demonstrates that 2D growth can be obtained by only tuning reaction concentration and temperature. This model not only has been applied to fabricate more than 30 different 2D nanomaterials in water at room temperature in the absence of additives, but also is promising in optimizing the experimental design of numerous other 2D nanomaterials.


Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3253
Author(s):  
Freskida Goni ◽  
Angela Chemelli ◽  
Frank Uhlig

Liquid-phase exfoliation (LPE) is a widely used and promising method for the production of 2D nanomaterials because it can be scaled up relatively easily. Nevertheless, the yields achieved by this process are still low, ranging between 2% and 5%, which makes the large-scale production of these materials difficult. In this report, we investigate the cause of these low yields by examining the sonication-assisted LPE of graphene, boron nitride nanosheets (BNNSs), and molybdenum disulfide nanosheets (MoS2 NS). Our results show that the low yields are caused by an equilibrium that is formed between the exfoliated nanosheets and the flocculated ones during the sonication process. This study provides an understanding of this behaviour, which prevents further exfoliation of nanosheets. By avoiding this equilibrium, we were able to increase the total yields of graphene, BNNSs, and MoS2 NS up to 14%, 44%, and 29%, respectively. Here, we demonstrate a modified LPE process that leads to the high-yield production of 2D nanomaterials.


2021 ◽  
Author(s):  
Meera Sathyan ◽  
Nisha T Padmanabhan ◽  
K V Vijoy ◽  
K J Saji ◽  
Honey John

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