Controlled Patterning of Carbon Nanotube Energy Levels by Covalent DNA Functionalization

ACS Nano ◽  
2019 ◽  
Vol 13 (7) ◽  
pp. 8222-8228 ◽  
Author(s):  
Yu Zheng ◽  
Sergei M. Bachilo ◽  
R. Bruce Weisman
Keyword(s):  
Carbon Nanotube ◽  
Energy Levels ◽  
Dna Functionalization

Quantum states in a nanotube quantum dot

2017 ◽  
Vol 31 (25) ◽  
pp. 1745023
Author(s):  
J. T. Wang ◽  
J. D. Fan
Keyword(s):  
Carbon Nanotube ◽  
High Efficiency ◽  
Energy Levels ◽  
Quantum States ◽  
Semiconductor Surface ◽  
Energy Structure ◽  
Two Dimensional ◽  
Quantum Energy ◽  
Quantum Bit ◽  
Computer Chips

In this paper, we carry out a theoretical calculation of quantum state and quantum energy structure in carbon nanotube embedded semiconductor surface. In this theoretical model, the electrons in the carbon nanotube are considered as in a two-dimensional cylindrical surface. Their motion, therefore, can be described by the Dirac equation. We solve the equation and find that the energy levels are quantized and are linearly dependent on the wave vectors along the [Formula: see text]-direction that is along the direction of the nanotube. This type of energy structure may have potential application for fabricating high efficiency solar cell or quantum bit in computer chips.

Electronic Structure of Straight and T-Shape Singled-Wall Carbon Nanotube Junctions: A Molecular Quantum Mechanics Study

2008 ◽  
Vol 55-57 ◽  
pp. 565-568 ◽  
Author(s):  
A. Udomvech ◽  
Teerakiat Kerdcharoen
Keyword(s):  
Carbon Nanotube ◽  
Molecular Electronics ◽  
Energy Gap ◽  
Energy Levels ◽  
Hexagonal Lattice ◽  
Single Walled Carbon Nanotube ◽  
Quantum Size ◽  
Carbon Nanotube Junctions ◽  
Molecular Quantum Mechanics ◽  
Homo Lumo

In this paper, the straight and T-shape single-walled carbon nanotube intramolecular junction (SWCNT-IMJ) were studied theoretically. The geometries of topological defect can be constructed by fusing two nanotubes having different helicities and diameters. For straight IMJ, the armchair (5,5) and (8,8) nanotubes segments were fused with the zigzag (n,0) segment varying from (6,0) to (10,0). T-junctions were constructed by joining a zigzag (n,0) tube, varying from n = 5 to 10, onto a fixed zigzag (9,0) tube sidewall. These junctions are composed of one or more pentagon and heptagon rings, and mixed pentagon-heptagon pairs as defects in the perfect hexagonal lattice. The study shows that the occurrence of defects geometries on SWCNT-IMJ and T-shape structures depends on the variation of tube helicity and diameter of combining nanotubes. The HOMO-LUMO energy levels exhibit the even-odd “quantum size” oscillation. The decreasing energy gap depends on variation of tube helicity and diameter of carbon nanotube. This study can be helpful as a knowledge base in the field of carbon nanotube molecular electronics.

scholarly journals Controlled Patterning of Carbon Nanotube Energy Levels by Covalent DNA Functionalization

2019 ◽  
Author(s):  
Yu Zheng ◽  
Sergei Bachilo ◽  
R. Bruce Weisman
Keyword(s):  
Optical Properties ◽  
Carbon Nanotube ◽  
Nucleotide Sequence ◽  
Spatial Pattern ◽  
Chemical Reactions ◽  
Energy Levels ◽  
Structural Form ◽  
Ambient Conditions ◽  
Simple Method ◽  
Covalent Bonds

Each structural form of single-wall carbon nanotube (SWCNT) has remarkable and well-defined electronic and optical properties, but it has not been possible to achieve spatial or energetic 10 modulation of those properties in controllable ways. We present here a simple method for using chemical reactions with single-stranded DNA (ssDNA) to accomplish such modulation. When aqueous suspensions of SWCNTs coated with ssDNA are exposed to singlet oxygen under ambient conditions, the nanotubes selectively form covalent bonds to the guanine nucleotides. This locally modulates semiconducting SWCNT energy levels and red-shifts their emission 15 wavelengths by up to 10%. Both the magnitude and spatial pattern of these shifts can be controlled by selecting the nucleotide sequence used to coat the nanotubes. Biomedical and opto-electronic applications are foreseen.

Dyes in Vertically Aligned Carbon Nanotube Arrays for Solar Cell Applications

2012 ◽  
Vol 1390 ◽  
Author(s):  
Gerhard Lackner ◽  
Ingolf Endler ◽  
Frank Meissner ◽  
Sebastian Scholz ◽  
Tobias Mayer-Uhma ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Organic Solar Cells ◽  
Copper Phthalocyanine ◽  
Bulk Heterojunction ◽  
Energy Levels ◽  
Electrical Characterization ◽  
Hydrophobic Surface ◽  
Nanotube Arrays ◽  
Carbon Nanotube Arrays ◽  
Vertically Aligned

ABSTRACTThe infiltration of dissolved dyes into vertically aligned carbon nanotube arrays (va-CNT) is reported. The ultra hydrophobic surface of the CNT forest can be wetted and hence infiltrated for an appropriate choice of solvent. The dye-infiltrated CNT array forms a well ordered bulk-heterojunction structure for organic solar cells in which the CNT can act as a large electrode or, for appropriate energy levels, as an acceptor material. Derivatives of the small molecule copper phthalocyanine or the polymer poly(3-hexylthiophene) were used as dyes. Drop coating was chosen as the infiltration technique resulting in a completely embedded CNT forest. Field emission secondary electron microscopy analysis illustrates the final layer quality. Common electrical characterization under AM1.5 illumination proves photosensitivity and implies photovoltaic behavior of the composite.

scholarly journals Controlled Patterning of Carbon Nanotube Energy Levels by Covalent DNA Functionalization

2019 ◽  
Author(s):  
Yu Zheng ◽  
Sergei Bachilo ◽  
R. Bruce Weisman
Keyword(s):  
Optical Properties ◽  
Carbon Nanotube ◽  
Nucleotide Sequence ◽  
Spatial Pattern ◽  
Chemical Reactions ◽  
Energy Levels ◽  
Structural Form ◽  
Ambient Conditions ◽  
Simple Method ◽  
Covalent Bonds

Each structural form of single-wall carbon nanotube (SWCNT) has remarkable and well-defined electronic and optical properties, but it has not been possible to achieve spatial or energetic 10 modulation of those properties in controllable ways. We present here a simple method for using chemical reactions with single-stranded DNA (ssDNA) to accomplish such modulation. When aqueous suspensions of SWCNTs coated with ssDNA are exposed to singlet oxygen under ambient conditions, the nanotubes selectively form covalent bonds to the guanine nucleotides. This locally modulates semiconducting SWCNT energy levels and red-shifts their emission 15 wavelengths by up to 10%. Both the magnitude and spatial pattern of these shifts can be controlled by selecting the nucleotide sequence used to coat the nanotubes. Biomedical and opto-electronic applications are foreseen.

Integrated electrochromic supercapacitors with visual energy levels boosted by coating onto carbon nanotube conductive networks

2020 ◽  
Vol 206 ◽  
pp. 110330 ◽  
Author(s):  
Kun Xu ◽  
Qianqian Zhang ◽  
Zhendong Hao ◽  
Yanhui Tang ◽  
Hao Wang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Energy Levels

scholarly journals An ab Initio Calculations of Single-Electron Transistor Based Single Walled Carbon Nanotube of Ultra-Small Diameter

2020 ◽  
Keyword(s):  
Carbon Nanotube ◽  
Density Functional ◽  
Energy Levels ◽  
Small Diameter ◽  
Stability Diagram ◽  
Single Electron ◽  
Single Electron Transistor ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Charge Stability

In this paper, we have investigated the charge stability diagram and conductance dependence on source drain bias and gate voltage of carbon nanotube based single electron transistor (SET) by using first principle calculations. All calculations have been executed by using ATK-VNL simulation package based on density functional theory (DFT). We have applied these calculations for carbon nanotube based SET; the nanotube has been placed just above the dielectric ( ) in between the source and drain electrodes of gold. The single walled carbon nanotube has been used in SET, which have ultra-small diameter and (4,0) configuration. The addition energy of the device has been calculated, which can be defined as the difference between the electron affinity, and ionization energies. The calculated values of energies have been found to be -10.17694 eV and -11.04034 eV for isolated phase and SET environment respectively. In electrostatic environment, the results were showing the regularization of molecular energy levels and therefore the addition energy reduced. The calculations for additional energies, variations of total energies to that of the gate voltages and charge stability diagram (CSD) have also been done in this study.

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