scholarly journals Seeing the Unseen: The Role of Liquid Crystals in Gas‐Sensing Technologies

2020 ◽  
Vol 8 (11) ◽  
pp. 1902117 ◽  
Author(s):  
Carina Esteves ◽  
Efthymia Ramou ◽  
Ana Raquel Pina Porteira ◽  
Arménio Jorge Moura Barbosa ◽  
Ana Cecília Afonso Roque
Keyword(s):  
Liquid Crystals ◽  
Gas Sensing

Light propagation in cholesteric liquid crystals: the role of chirality

2020 ◽  
Vol 713 (1) ◽  
pp. 65-77
Author(s):  
Tianyi Guo ◽  
Xiaoyu Zheng ◽  
Peter Palffy-Muhoray
Keyword(s):  
Liquid Crystals ◽  
Light Propagation ◽  
Cholesteric Liquid Crystals

Role of the heterojunctions in In2O3-composite SnO2nanorod sensors and their remarkable gas-sensing performance for NOxat room temperature

Nanoscale ◽  
2015 ◽  
Vol 7 (35) ◽  
pp. 14643-14651 ◽  
Author(s):  
Shuang Xu ◽  
Jun Gao ◽  
Linlin Wang ◽  
Kan Kan ◽  
Yu Xie ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Sensing Performance

Modeling, Design, and Applications of the Gas Sensors Based on Graphene and Carbon Nanotubes

2017 ◽  
pp. 920-946
Author(s):  
Rafael Vargas-Bernal
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensors ◽  
Carbon Nanomaterials ◽  
Gas Sensing ◽  
Prospective Analysis ◽  
The Third ◽  
Potential Applications ◽  
Technical Advances ◽  
The Impact

Gas sensing continues attracting research communities due to its potential applications in the sectors military, industrial and commercial. A special emphasis is placed on the use of carbon nanomaterials such as carbon nanotubes and graphene, as sensing materials. The chapter will be divided as follows: In the first part, a description of the main topologies and materials (carbon nanomaterials plus polymers, metals, ceramics or combinations between these groups) used to fabricate gas sensors based on graphene and carbon nanotubes that are operated by conductance or resistance electrical, is realized. Next, different mathematical models that can be used to simulate gas sensors based on these materials are presented. In the third part, the impact of the graphene and carbon nanotubes on gas sensors is exemplified with technical advances achieved until now. Finally, it is provided a prospective analysis on the role of the gas sensors based on carbon nanomaterials in the next decades.

scholarly journals Effect of Heterointerface on NO2 Sensing Properties of In-Situ Formed TiO2 QDs-Decorated NiO Nanosheets

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1628 ◽  
Author(s):  
Congyi Wu ◽  
Jian Zhang ◽  
Xiaoxia Wang ◽  
Changsheng Xie ◽  
Songxin Shi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Gas Sensing ◽  
Tio2 Particle ◽  
Sensing Properties ◽  
Practical Applications ◽  
Enhanced Sensitivity ◽  
Peak Fitting ◽  
Two Phases ◽  
Nio Nanosheets

In this work, TiO2 QDs-modified NiO nanosheets were employed to improve the room temperature NO2 sensing properties of NiO. The gas sensing studies showed that the response of nanocomposites with the optimal ratio to 60 ppm NO2 was nearly 10 times larger than that of bare NiO, exhibiting a potential application in gas sensing. Considering the commonly reported immature mechanism that the effective charge transfer between two phases contributes to an enhanced sensitivity, the QDs sensitization mechanism was further detailed by designing a series of contrast experiments. First, the important role of the QDs size effect was revealed by comparing the little enhanced sensitivity of TiO2 particle-modified NiO with the largely enhanced sensitivity of TiO2 QDs-NiO. Second, and more importantly, direct evidence of the heterointerface charge transfer efficiency was detailed by the extracted interface bond (Ti-O-Ni) using XPS peak fitting. This work can thus provide guidelines to design more QDs-modified nanocomposites with higher sensitivity for practical applications.

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