fowler nordheim fn field emission current from nanostructured materials
fowler-nordheim field emission effects in semiconductor nanostructures
Ngày tải lên :
29/05/2014, 16:25
... 7.3.1 Field Emission from Carbon Nanotubes in the Presence of Strong Electric Field 7.3.2 Optimization of Fowler Nordheim (FN) Field Emission Current from Nanostructured Materials ... 1.2.6 The Field Emission from Quantum Wires of Stressed Semiconductors 1.2.7 The Field Emission from Quantum Wires of Tellurium 1.2.8 The Field Emission from Quantum ... 1.2.11 The Field Emission from Quantum Wires of Germanium 1.2.12 The Field Emission from Quantum Wires of Gallium Antimonide 1.2.13 The Field Emission from Quantum...
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Báo cáo hóa học: "Enhanced Field Emission from Argon Plasma-Treated Ultra-sharp a-Fe2O3 Nanoflakes" pdf
Ngày tải lên :
21/06/2014, 20:20
... both as-grown and plasma-treated samples, indicating that the field emission from a-Fe2O3 nanoflake films follow the Fowler Nordheim (FN) relationship [21] The dots are experimental data and the solid ... increased from the original 16–60 lA cm-2 At the same time, the turn-on field has been reduced from 10 to V lm-1 after 10 exposure to Ar plasma The exponential dependence between the emission current ... solid lines are the fitted curves in accordance with the simplified Fowler Nordheim equation [21]: 123 Fig a Typical field -emission current density–applied field (J–E) curves of the a-Fe2O3 nanoflakes...
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Báo cáo hóa học: " A Study on Field Emission Characteristics of Planar Graphene Layers Obtained from a Highly Oriented Pyrolyzed Graphite Block" potx
Ngày tải lên :
22/06/2014, 00:20
... behavior of the Fowler Nordheim relationship The field emission current fluctuated for applied voltages higher than 33 V Figure 5b shows F–N curves obtained as a result of field emission from a graphene ... was used to measure field emission from individual graphene sheets (Fig 2) Figure shows the schematic view of the experimental setup for measuring a field emission current from graphene sheets In ... Kokai, M Yudasaka, S Iijima, J Appl Phys 91, 10107 (2002) Fig a I–E plot for emission current b F–N plot for emission current 123 ...
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synthesis, electrical measurement, and field emission properties of a-fe2o3 nanowires
Ngày tải lên :
20/03/2014, 13:08
... the scanning tip From the current image taken at a ?10 V bias, the bright zone indicates that a current appeared on the tip of the single NW It can also be seen that there was no current 123 334 ... the field emission current density versus electrical field (J-E) for the four samples The turn-on field (Eto) is defined as the value of the applied electrical field which produces an emission current ... al., Scanning field emission from patterned carbon nanotube films Appl Phys Lett 76, 2071–2073 (2000) doi:10.1063/1.126258 H Gao, C Mu, F Wang, D.S Xu, K Wu, Y.C Xie et al., Field emission of large-area...
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ultra-sharp a-fe2o3 nanoflakes growth mechanism and field-emission
Ngày tải lên :
20/03/2014, 13:11
... 1/E relationship inset of Fig 6, indicates that the field emission from α-Fe2 O3 ultra-sharp nanoflakes films follows the Fowler Nordheim (FN) relationship [23] The dots are experimental data and ... to the simplified Fowler Nordheim equation: A(βE)2 Bϕ J= exp − ϕ βE , (1) where J is the current density, E is the applied field strength, ϕ is the work function, for electron emission which is ... mechanism is responsible for the emission from the ultra-sharp nanoflakes [30] In our previous works [8, 17], the electron field emission was only effectively observed from the α-Fe2 O3 nanoflakes grown...
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Báo cáo hóa học: " Field emission enhancement of Au-Si nano-particle-decorated silicon nanowires" doc
Ngày tải lên :
21/06/2014, 05:20
... Application of carbon nanotubes to field emission displays Diam Relat Mater 2001, 10:265 11 Park CJ, Choi DK, Yoo J, Yi GC, Lee CJ: Enhanced field emission properties from well-aligned zinc oxide nanoneedles ... B, Wang RM, Yu DP: Efficient field emission from ZnO nanoneedle arrays Appl Phys Lett 2003, 83:144 13 Xiang B, Zhang Y, Wang Z, Luo XH, Zhu YW, Zhang HZ, Yu DP: Fieldemission properties of TiO2 ... molybdenum oxides: synthesis and field emission properties Adv Mater 2003, 15:1835 16 Chen J, Deng SZ, Xu NS, Wang SH, Wen XG, Yang SH, Yang CL, Wang JN, Ge WK: Field emission from crystalline copper...
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Báo cáo hóa học: " Morphology-dependent field emission properties and wetting behavior of ZnO nanowire arrays" docx
Ngày tải lên :
21/06/2014, 06:20
... morphology-dependent emission current density J on the electric field E at cathode-anode distance of 300 μm for all the measurements For the sample C, the turn-on field (Eto) defined as the electric field required ... related to the corresponding nanostructured arrays Abbreviations CA: contact angle; DI: de-ionized; FE-SEM: field emission scanning electron microscope; F-N: Fowler- Nordheim; VLS: vapor-liquid-solid ... RM, Yu DP: Efficient field emission from ZnO nanoneedle arrays Appl Phys Lett 2003, 83:144 Tseng YK, Huang CJ, Cheng HM, Lin IN, Liu KS, Chen IC: Characterization and Field- Emission Properties...
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Báo cáo hóa học: " On the Morphology, Structure and Field Emission Properties of Silver-Tetracyanoquinodimethane Nanostructures" pptx
Ngày tải lên :
21/06/2014, 17:20
... turn-on field for the samples in Fig 2b In order to analyze the origin of field emission from nanostructures, the revised Fowler Nordheim( F–N) model is often used If the plot of (ln (J/E2) vs 1/E or ln ... identical to the applied field for emission, it is necessary to consider the effect during the field emission process To study the process of field emission for Ag-TCNQ nanostructured arrays, XRD analysis ... nanostructured array shows good field emission property with higher current density Figure 6b, c shows the I-E curves and corresponding F–N plots for sweeping emission from Ag-TCNQ nanowires with 30-nm-thick...
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báo cáo hóa học:" Paradox of low field enhancement factor for field emission nanodiodes in relation to quantum screening effects" doc
Ngày tải lên :
21/06/2014, 17:20
... low field enhancement factor obtained from the experimental Fowler- Nordheim [FN] plot The field enhancement factor may describe the ability of specific emitters to amplify the macroscopic field, ... Results and discussion The field emission from emitters can be described by the well-known FN tunneling, where the emission current ( I ), as a function of the local field ( F ) at the tip surface ... quantum screening effects; field emission; vacuum electronics; Fowler- Nordheim tunneling; silicon nanostructures Introduction Recently, micro-/nano-fabricated field emission arrays [FEAs] have...
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báo cáo hóa học:" Synthesis and Enhanced Field-Emission of Thin-Walled, Open-Ended, and Well-Aligned N-Doped Carbon " pot
Ngày tải lên :
21/06/2014, 18:20
... field (Eth) are defined as the electric fields when the emission current densities reach at 10 lA/cm2 and 1.0 mA/cm2, respectively [5] Field- emission values of different samples are shown in Table ... temperatures from SEM observations (see Fig 8b–d) The field -emission measurements were carried out in a vaccum chamber of 2.2 10-6 Torr with CNT samples on silicon wafer as cathode Figure shows the field -emission ... from impurity particles As seen from Fig 1d, the CNTs grown at 860°C are open-ended, in fact the CNTs are all open-ended in the range of 780–860°C This is of vital importance for their field-emission...
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Báo cáo hóa học: " Field Emission Properties and Fabrication of CdS Nanotube Arrays" pot
Ngày tải lên :
22/06/2014, 00:20
... electrodes is 300 lm A direct current Nanoscale Res Lett (2009) 4:955–961 voltage sweeping from to 5000 V was applied to the sample at a step of 50 V The emission current is monitored using a ... nanotubes were firstly performed The typical plot of the FE current density J versus the applied electric field (J–E) and the corresponding Fowler Nordheim (F–N) plots of those CdS nanotube arrays are ... CdS nanotube Fig a Field emission J–E curve of CdS nanotube arrays b The corresponding F–N plot of CdS nanotube arrays 123 960 Nanoscale Res Lett (2009) 4:955–961 Table The field emission properties...
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Báo cáo hóa học: " Effect of Substrate Morphology on Growth and Field Emission Properties of Carbon Nanotube Films" pptx
Ngày tải lên :
22/06/2014, 01:20
... voltage Emission current density was calculated by dividing the emission current with the exposed area of the sample Emission performances of all of the four samples were analyzed using Fowler Nordheim ... more current than dense interior region It is to be noted that no significant emission current was observed with porous/ mechanically polished Si substrates This confirmed that emission occurred from ... very few emission sites were found to be active But the number increased with increase in the applied field and emission from all Nanoscale Res Lett (2008) 3:205–212 211 Fig Sequence of field emission...
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Báo cáo hóa học: " Synthesis, Electrical Measurement, and Field Emission Properties of a-Fe2O3 Nanowires" potx
Ngày tải lên :
22/06/2014, 01:20
... the scanning tip From the current image taken at a ?10 V bias, the bright zone indicates that a current appeared on the tip of the single NW It can also be seen that there was no current 123 334 ... the field emission current density versus electrical field (J-E) for the four samples The turn-on field (Eto) is defined as the value of the applied electrical field which produces an emission current ... al., Scanning field emission from patterned carbon nanotube films Appl Phys Lett 76, 2071–2073 (2000) doi:10.1063/1.126258 H Gao, C Mu, F Wang, D.S Xu, K Wu, Y.C Xie et al., Field emission of large-area...
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Báo cáo hóa học: " Field Emission and Radial Distribution Function Studies of Fractal-like Amorphous Carbon Nanotips" potx
Ngày tải lên :
22/06/2014, 01:20
... for our calculations of the emission current densities we have used as the active emitting area the cross section of the total nanotree such that the values for the current density per branch’s ... can be acquired using Eq [25] À1 r2 h ¼ sin : ð4Þ 2r1 From this expression, a bond angle of 124° was obtained This bond angle differs from a sp2 trigonally bonded carbon, which has a bond angle ... extracting a current of 10 nA, which is much lower than the 88 V/lm turn on field found in ref [12] for a single nanotip The fact that several branches are contributing to the total current can...
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Báo cáo hóa học: " Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process" doc
Ngày tải lên :
22/06/2014, 06:20
... random orientation configuration for the best emission Field emission is usually analyzed using Fowler Nordheim (F–N) theory, according to which emission current density is dependent on the local ... Figure 3a shows the comparative emission current density (J) vs macroscopic field (E) of samples 2, 3, and No significant emission current was observed from sample The emission measurements were carried ... significant emission current was observed from sample in the measurement range This confirmed that the catalytic particles lying on the substrate had no contribution and emission occurred from CNTs...
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Báo cáo hóa học: " Effect of Purity and Substrate on Field Emission Properties of Multi-walled Carbon Nanotubes" pdf
Ngày tải lên :
22/06/2014, 18:20
... The corresponding Fowler Nordheim (FN) plots are shown in Fig 4b Field emission by the samples have been analyzed using the Fowler Nordheim theory, according to which emission current density (J) ... for all the samples, emission occurs from multiple emitters and hence the measured current is an average of currents due to individual emitters The exact analysis of field emission characteristics ... to emission assisted surface reaction processes [25–27] The current stability of the samples was monitored continuously for a period of h at a current density of 0.2 mA/cm–2 The emission current...
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Báo cáo hóa học: " Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process" pot
Ngày tải lên :
22/06/2014, 19:20
... random orientation configuration for the best emission Field emission is usually analyzed using Fowler Nordheim (F–N) theory, according to which emission current density is dependent on the local ... Figure 3a shows the comparative emission current density (J) vs macroscopic field (E) of samples 2, 3, and No significant emission current was observed from sample The emission measurements were carried ... significant emission current was observed from sample in the measurement range This confirmed that the catalytic particles lying on the substrate had no contribution and emission occurred from CNTs...
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Study of field emission characteristics of ultrathin film coated carbon nanotubes core shell structures 1
Ngày tải lên :
11/09/2015, 10:17
... References 17 CHAPTER PHYSICS OF FIELD EMISSION 20 2.1 Field Emission and Fowler- Nordheim Theory 20 2.2 Field Emission from Semiconductors 23 2.3 Influencing Parameters of Field Emission 25 References ... function of the metal 21 Fig 2.2 The electron emission current density versus applied field (J-E) characteristics of the specimen The corresponding Fowler Nordheim (F-N) plot is shown in the inset ... energy CBM Conduction band minimum CNT Carbon nanotube DC Direct current DLC Diamond-like carbon FE Field emission F-N Fowler- Nordheim FWHM Full width at half maximum HRTEM high-resolution transmission...
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Study of field emission characteristics of ultrathin film coated carbon nanotubes core shell structures 2
Ngày tải lên :
11/09/2015, 10:17
... metal The Fowler- Nordheim (F Nordheim (F-N) theory was developed by R H Fowler and L W Nordheim as well as some other researchers in order to describe the relationship between the emission current ... 1/E 0 Applied electric field, E ( V/µm) Fig 2.2 The electron emission current density versus applied field (J-E) characteristics of the specimen The corresponding Fowler Nordheim (F-N) plot is ... Field Emission from Semiconductors Field emission was once considered to be an exclusive phenomenon of metals, however, semiconductors were later found to exhibit similar properties and the emission...
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Study of field emission characteristics of ultrathin film coated carbon nanotubes core shell structures 3
Ngày tải lên :
11/09/2015, 10:17
... acquisition time per spectrum of ~150 s 3.4 Field Emission Apparatus Field emission testing of the samples was carried out with a custom-designed field emission system, using parallel plate geometry ... define the total emission area The chamber was pumped down to a base pressure of × 10-6 Torr The field emission current- voltage (I-V) relationship was obtained by applying a DC field between the ... used worldwidely to grow various materials, including carbon and carbon related materials (diamond, nanocrystalline diamond and CNTs, etc.) and non-carbon advanced materials, such as GaN, SiC, Ga2O3...
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