Electrical Properties of Graphite Nanoparticles in Silicone

Littlejohn, Samuel David

doi:10.1007/978-3-319-00741-0

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…This assumes that electrons in each graphitic domain do not see the potential from other domains due to screening. Graphite’s electron tunnelling rates can be treated with the same equation as that of a Fermi–Dirac obeying metal if an effective mass for the electron in graphite is used 25 to account for Graphite’s electronic band structure. Therefore, we can use the analysis of Simmons with a correction factor for the effective electron mass 25 .…”

Section: Methodology: Model Developmentmentioning

confidence: 99%

“…Graphite’s electron tunnelling rates can be treated with the same equation as that of a Fermi–Dirac obeying metal if an effective mass for the electron in graphite is used 25 to account for Graphite’s electronic band structure. Therefore, we can use the analysis of Simmons with a correction factor for the effective electron mass 25 . where is the effective mass of the electron in graphite 25 , is the empirically found nearest neighbour interaction between atoms of the same type, is the Fermi velocity of electrons in graphite at the Dirac point and is the rest mass of a free electron.…”

Section: Methodology: Model Developmentmentioning

confidence: 99%

“…Therefore, we can use the analysis of Simmons with a correction factor for the effective electron mass 25 . where is the effective mass of the electron in graphite 25 , is the empirically found nearest neighbour interaction between atoms of the same type, is the Fermi velocity of electrons in graphite at the Dirac point and is the rest mass of a free electron. Brandt et al 26 have found where e is the magnitude of the electronic charge of an electron.…”

Section: Methodology: Model Developmentmentioning

confidence: 99%

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Theoretical characterisation of electron tunnelling from granular activated carbon to electron accepting organisms in direct interspecies electron transfer

Rao

Lee

2022

Sci Rep

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Direct interspecies electron transfer (DIET) has been identified as an efficient metabolism between symbiotically interacting organisms. One method of DIET uses conductive materials (e.g., granular activated carbon (GAC)) as a medium to shuttle electrons from electron donating organisms (eg., Geobacter metallireducens) to electron accepting organisms (e.g., Geobacter sulfurreducens and Methanosarcina barkeri). Conductive materials such as GAC, become negatively charged in DIET processes due to reduction by electron donating organisms. This high excess electron density in GAC leads to quantum tunnelling of electrons being a significant electron transfer mechanism for DIET. Thus, a theoretical model obeying the Wentzel–Kramers–Brillouin (WKB) approximation and Fermi–Dirac statistics was developed and simulated. In the model, the electron tunnelling transfer barrier was described by an effective rectangular barrier. The result of our 1D tunnelling simulations indicates that within 29.4 nm of the GAC, tunnelling can sufficiently supply electrons from GAC to G. sulfurreducens and M. barkeri. The phenomenon of tunnelling may also have significance as a stimulant of chemotaxis for G. sulfurreducens and other electron accepting microbes when attempting to adsorb onto GAC. This study sheds light on quantum tunnelling’s significant potential in both bacterium and archaeon DIET-centric processes.

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Section: Methodology: Model Developmentmentioning

confidence: 99%

Section: Methodology: Model Developmentmentioning

confidence: 99%

Section: Methodology: Model Developmentmentioning

confidence: 99%

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Theoretical characterisation of electron tunnelling from granular activated carbon to electron accepting organisms in direct interspecies electron transfer

Rao

Lee

2022

Sci Rep

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“…Carbon compounds that form a hexagonal layer of three electrons are used to form a covalent bond with the nearest C atom, while the fourth electron is a free electron that moves through the surface of the layer. This free electron causes the carbon material to conduct electric current [21]. Phosphorus which has five valence electrons is a donor or an n-type doping agent.…”

Section: Content Of Dssc Elementsmentioning

confidence: 99%

Performance Improvement of Dye-Sensitized Solar Cell- (DSSC-) Based Natural Dyes by Clathrin Protein

Trihutomo

Soeparman

Widhiyanuriyawan

et al. 2019

International Journal of Photoenergy

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Dye-Sensitized Solar Cell (DSSC) is a solar cell device that works using electrochemical principles in which sensitive dyes are absorbed in the TiO2 photoelectrode layer. The problem of DSSC-based natural dyes is the lower efficiency than silicon solar cells. This low efficiency is due to the barrier of electron transfer in the TiO2 semiconductor layer. In this study, the addition of clathrin protein to the TiO2 layer was used to increase electron transfer in the semiconductor layer resulting in improved DSSC performance. Clathrin is a protein that plays a role in the formation of transport vesicle membrane in eukaryotic cells. The method used in this study is clathrin protein with a concentration of 0%, 25%, 50%, and 75% added to TiO2 in DSSC structure. Photovoltaic characteristics of DSSC were measured using a data logger to determine the performance of DSSC, layer morphology was analyzed using Scanning Electron Microscopy (SEM), the element content in DSSC was analyzed using Energy-Dispersive X-ray Spectroscopy (EDS), and functional groups in DSSC layers were analyzed using Fourier-Transform Infrared Spectroscopy (FTIR). The result of this study is the addition of clathrin protein can improve DSSC performance, which resulted in the highest performance of DSSC on 75% clathrin protein addition with efficiency=1.465%, Isc=5.247 mA, and Voc=657 mV. From the results of SEM analysis, it appears that clathrin protein molecules fill the cavities in TiO2 molecules. EDS analysis shows an increase in carbon, oxygen, and phosphorus content in TiO2 layers with increasing clathrin protein concentration. FTIR analysis shows an increasingly sharp absorption in the FTIR spectrum of protein-forming functional groups by increasing clathrin protein concentration in DSSC.

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“…The carbon forms three covalent σ bonds at an angle of 120•. Additionally, a high electrical conductivity is achieved when π electron is able to move freely between carbon atoms [7].…”

Section: Graphenementioning

confidence: 99%

Graphene Nanoribbon Simulator of Vacancy Defects On Electronic Structure

Wong

Mahadzir

Chong

et al. 2018

IJEEI

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Graphene Nanoribbon Simulator (GNRSIM) is developed using MATLAB Graphical User Interface Development Environment to study the electronics properties of graphene nanoribbons (GNRs). The main focus of this research is the simulation effects of single vacancy 1 in graphene nanoribbons lattices on electronic structure. The band structure and density of states are explored by using tight binding approximation where a Hamiltonian operator with nearest-neighbor interactions is introduced. The simulator has a wide range of input parameters where user can select armchair or zigzag GNR. The size of the lattices namely width and length can be varied. The location of the vacancy defect can be pinpoint by providing the row and column of the missing atom. The limitation of GNRSIM at present is that it can only accept a single atom vacancy. GNRSIM is able to be executed as a standalone application software in understanding the fundamental properties of semiconductor material and device engineering through ab-initio calculations.

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Electrical Properties of Graphite Nanoparticles in Silicone

Cited by 13 publications

References 11 publications

Theoretical characterisation of electron tunnelling from granular activated carbon to electron accepting organisms in direct interspecies electron transfer

Theoretical characterisation of electron tunnelling from granular activated carbon to electron accepting organisms in direct interspecies electron transfer

Performance Improvement of Dye-Sensitized Solar Cell- (DSSC-) Based Natural Dyes by Clathrin Protein

Graphene Nanoribbon Simulator of Vacancy Defects On Electronic Structure

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