AC-Impedance Spectroscopic Analysis on the Charge Transport in CVD-Grown Graphene Devices with Chemically Modified Substrates

2016 ◽  
Vol 8 (41) ◽  
pp. 27421-27425 ◽  
Author(s):  
Bok Ki Min ◽  
Seong K. Kim ◽  
Seong Ho Kim ◽  
Min-A Kang ◽  
Suttinart Noothongkaew ◽  
...  
Keyword(s):  
Charge Transport ◽  
Spectroscopic Analysis ◽  
Ac Impedance ◽  
Chemically Modified ◽  
Grown Graphene ◽  
Graphene Devices

Room temperature NH3 detection of Ti/graphene devices promoted by visible light illumination

2017 ◽  
Vol 5 (5) ◽  
pp. 1113-1120 ◽  
Author(s):  
Min Zhao ◽  
Lanqin Yan ◽  
Xianfeng Zhang ◽  
Lihua Xu ◽  
Zhiwei Song ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Visible Light ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Grown Graphene ◽  
Graphene Devices

3, 5 and 10 nm thick Ti decorated chemical-vapor-deposition (CVD) grown graphene devices (Ti/Gr) for NH3 detection were fabricated, and their sensing performances were great promoted by visible light illumination.

Charge transport in single and few layer graphene devices

2009 ◽  
Author(s):  
M. F. Craciun ◽  
S. Russo ◽  
M. Yamamoto ◽  
J. B. Oostinga ◽  
A. Morpurgo ◽  
...  
Keyword(s):  
Charge Transport ◽  
Layer Graphene ◽  
Graphene Devices ◽  
Few Layer Graphene

A Comparative Study of AC Impedance Spectroscopic Analysis on LiMVO4 (M: Ni, Co)

2019 ◽  
Vol 1 (26) ◽  
pp. 47-58
Author(s):  
Modachur S. Bhuvaneswari ◽  
S.Selvasekarapandian Subramanian
Keyword(s):  
Comparative Study ◽  
Spectroscopic Analysis ◽  
Ac Impedance

scholarly journals Ultrahigh-mobility graphene devices from chemical vapor deposition on reusable copper

2015 ◽  
Vol 1 (6) ◽  
pp. e1500222 ◽  
Author(s):  
Luca Banszerus ◽  
Michael Schmitz ◽  
Stephan Engels ◽  
Jan Dauber ◽  
Martin Oellers ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Copper Substrate ◽  
High Mobility ◽  
Chemical Vapor ◽  
Magnetic Field Sensors ◽  
Exfoliated Graphene ◽  
Cost Efficient ◽  
Grown Graphene ◽  
Graphene Devices

Graphene research has prospered impressively in the past few years, and promising applications such as high-frequency transistors, magnetic field sensors, and flexible optoelectronics are just waiting for a scalable and cost-efficient fabrication technology to produce high-mobility graphene. Although significant progress has been made in chemical vapor deposition (CVD) and epitaxial growth of graphene, the carrier mobility obtained with these techniques is still significantly lower than what is achieved using exfoliated graphene. We show that the quality of CVD-grown graphene depends critically on the used transfer process, and we report on an advanced transfer technique that allows both reusing the copper substrate of the CVD growth and making devices with mobilities as high as 350,000 cm2V–1s–1, thus rivaling exfoliated graphene.

scholarly journals Chemically modified electrodes for electrocatalysis

1981 ◽  
Vol 302 (1468) ◽  
pp. 253-265 ◽  
Keyword(s):  
Electron Transfer ◽  
Charge Transport ◽  
Modified Electrode ◽  
Reaction Rate ◽  
Modified Electrodes ◽  
Chemically Modified ◽  
Chemical Reaction Rate ◽  
Electron Transfer Mediation ◽  
Electrocatalytic Reaction ◽  
Chemical Rate

At a modified electrode, electrocatalysis is accomplished by an immobilized redox substance acting as an electron transfer mediator between the electrode and a reaction substrate. Such mediated electrocatalysis is possible with monomolecular and multimolecular layers of the redox substance. The electron transfer mediation can assume several special forms; these are identified and experimental examples are given. The differences between electrocatalytic behaviour of monomolecular and multimolecular layers are discussed; electrocatalysis in the latter circumstance can include reaction rate elements of electrochemical charge and substrate migration through the multilayer in addition to the chemical rate. Theoretical ideas are presented that interconnect these three rate elements, to show that either all of the multilayer sites can participate in the electrocatalytic reaction, or only about the equivalent of a monolayer, depending on the relative rates of the electrochemical charge transport, the diffusion of substrate, and the chemical reaction rate.

The AC impedance and variable temperature dielectric spectroscopic analysis of MnO2 doped and un-doped ZnO–V2O5 ceramics

2011 ◽  
Vol 23 (6) ◽  
pp. 1143-1150 ◽  
Author(s):  
Jun Wu ◽  
Ting Qi ◽  
Taotao T. Li ◽  
Qingwei W. Qin ◽  
Guangqiang Q. Li ◽  
...  
Keyword(s):  
Spectroscopic Analysis ◽  
Variable Temperature ◽  
Ac Impedance ◽  
Doped Zno
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