scholarly journals On the hydrogenation-dehydrogenation of graphene-layer-nanostructures: Relevance to the hydrogen on-board storage problem

2015 ◽  
Vol 10 (2) ◽  
pp. 54-89 ◽  
Author(s):  
S Nechaev Yu ◽  
T Veziroglu Nejat
Keyword(s):  
Graphene Layer ◽  
Storage Problem

scholarly journals Bio-Sensor Based on Trapped Mode All-Dielectric Metasurface Coated with Graphene Layer to Enhance Sensitivity

2021 ◽  
pp. 1-1
Author(s):  
Xuesong Deng ◽  
Ming Fang ◽  
Zhixiang Huang ◽  
Xingang Ren ◽  
Jiaming Shi ◽  
...  
Keyword(s):  
Graphene Layer ◽  
Trapped Mode ◽  
Dielectric Metasurface

scholarly journals Encapsulate α-MnO2 nanofiber within graphene layer to tune surface electronic structure for efficient ozone decomposition

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guoxiang Zhu ◽  
Wei Zhu ◽  
Yang Lou ◽  
Jun Ma ◽  
Wenqing Yao ◽  
...  
Keyword(s):  
Graphene Layer ◽  
Water Resistance ◽  
Catalyst Design ◽  
Ozone Decomposition ◽  
Oxygen Species ◽  
Ozone Molecule ◽  
Practical Application ◽  
Surface Electronic Structure ◽  
Reaction Barriers ◽  
Excellent Stability

AbstractMajor challenges encountered when developing manganese-based materials for ozone decomposition are related to the low stability and water inactivation. To solve these problems, a hierarchical structure consisted of graphene encapsulating α-MnO2 nanofiber was developed. The optimized catalyst exhibited a stable ozone conversion efficiency of 80% and excellent stability over 100 h under a relative humidity (RH) of 20%. Even though the RH increased to 50%, the ozone conversion also reached 70%, well beyond the performance of α-MnO2 nanofiber. Here, surface graphite carbon was activated by capturing the electron from inner unsaturated Mn atoms. The excellent stability originated from the moderate local work function, which compromised the reaction barriers in the adsorption of ozone molecule and the desorption of the intermediate oxygen species. The hydrophobic graphene shells hindered the chemisorption of water vapour, consequently enhanced its water resistance. This work offered insights for catalyst design and would promote the practical application of manganese-based catalysts in ozone decomposition.

scholarly journals Laser Patterning a Graphene Layer on a Ceramic Substrate for Sensor Applications

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2134 ◽  
Author(s):  
Marcin Lebioda ◽  
Ryszard Pawlak ◽  
Witold Szymański ◽  
Witold Kaczorowski ◽  
Agata Jeziorna
Keyword(s):  
High Speed ◽  
Graphene Layer ◽  
Ceramic Substrate ◽  
Direct Process ◽  
Laser Technology ◽  
Sensor Applications ◽  
Laser Patterning ◽  
Good Shape ◽  
Shape Mapping ◽  
Sensory Layer

This paper describes a method for patterning the graphene layer and gold electrodes on a ceramic substrate using a Nd:YAG nanosecond fiber laser. The technique enables the processing of both layers and trimming of the sensor parameters. The main aim was to develop a technique for the effective and efficient shaping of both the sensory layer and the metallic electrodes. The laser shaping method is characterized by high speed and very good shape mapping, regardless of the complexity of the processing. Importantly, the technique enables the simultaneous shaping of both the graphene layer and Au electrodes in a direct process that does not require a complex and expensive masking process, and without damaging the ceramic substrate. Our results confirmed the effectiveness of the developed laser technology for shaping a graphene layer and Au electrodes. The ceramic substrate can be used in the construction of various types of sensors operating in a wide temperature range, especially the cryogenic range.

scholarly journals Structural and Magnetic Properties of Ni81Fe19Thin Film Grown on Si(001) Substrate via Single Graphene Layer

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Gui-fang Li ◽  
Shibin Liu ◽  
Shanglin Yang ◽  
Yongqian Du
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Vapor Deposition ◽  
Graphene Layer ◽  
Structural Investigation ◽  
Annealing Temperature ◽  
Chemical Vapor ◽  
Magnetic Thin Films ◽  
Structural And Magnetic Properties

We prepared magnetic thin films Ni81Fe19on single-crystal Si(001) substrates via single graphene layer through magnetron sputtering for Ni81Fe19and chemical vapor deposition for graphene. Structural investigation showed that crystal quality of Ni81Fe19thin films was significantly improved with insertion of graphene layer compared with that directly grown on Si(001) substrate. Furthermore, saturation magnetization of Ni81Fe19/graphene/Si(001) heterostructure increased to 477 emu/cm3with annealing temperatureTa=400°C, which is much higher than values of Ni81Fe19/Si(001) heterostructures withTaranging from 200°C to 400°C.

Prominent Electron Penetration through Ultrathin Graphene Layer from FeNi Alloy for Efficient Reduction of CO2 to CO

ChemSusChem ◽  
2017 ◽  
Vol 10 (15) ◽  
pp. 3044-3048 ◽  
Author(s):  
Qingyuan Bi ◽  
Xin Wang ◽  
Feng Gu ◽  
Xianlong Du ◽  
Hongliang Bao ◽  
...  
Keyword(s):  
Graphene Layer ◽  
Efficient Reduction ◽  
Reduction Of Co2 ◽  
Feni Alloy

scholarly journals Mimicking nanoribbon behavior using a graphene layer on SiC

2010 ◽  
Vol 82 (15) ◽  
Author(s):  
Matheus P. Lima ◽  
A. R. Rocha ◽  
Antônio J. R. da Silva ◽  
A. Fazzio
Keyword(s):  
Graphene Layer
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