Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Scanning Electron Microscopy

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...

Atomic Emission Spectroscopy: Overview

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...

Atomic Emission Spectroscopy: Instrumentation

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

Atomic Emission Spectroscopy: Lab

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

The de Broglie Wavelength

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Complete Mitochondrial Genome of <i>Melophagus ovinus</i> from Qinghai-Tibet Plateau Provides Evidence for D-Loop Length Polymorphism.

Genes·2026

Same author

Inflammatory protein mediators linking gut microbiota to degenerative lumbar spine disorders: cross-disease genetic evidence.

Frontiers in immunology·2026

Same author

Gut and skin microbiota of <i>Bufo gargarizans</i> tadpoles respond differently to temperature.

Frontiers in microbiology·2026

Same author

Target-oriented molecularly imprinted polymers enable rapid ambient ionization mass spectrometric analysis of trace tetrachlorobisphenol a in environmental samples.

Journal of hazardous materials·2026

Same author

An exploration of undergraduate nursing students' heavy use of generative artificial intelligence in academic practice: A descriptive phenomenological study.

International journal of nursing studies·2026

Same author

TcrDesign: de novo design of epitope-specific full-length T cell receptors.

Science China. Life sciences·2026

Same journal

Deep PACBED: Multitask analysis of PACBED images using deep neural networks.

Ultramicroscopy·2026

Same journal

Guided progressive reconstructive imaging: A new quantization-based framework for low-dose, high-throughput and real-time analytical ptychography.

Ultramicroscopy·2026

Same journal

Brightness optimization in a 200 keV DTEM source by geometry-driven aberration suppression.

Ultramicroscopy·2026

Same journal

Characterization of the Timepix4 hybrid pixel detector and its impact on four-dimensional scanning transmission electron microscopy (4D-STEM).

Ultramicroscopy·2026

Same journal

Contamination analysis of the residual gas composition in transmission electron microscopy.

Ultramicroscopy·2026

Same journal

Temperature-dependent mean inner potential of polystyrene spheres measured using off-axis electron holography.

Ultramicroscopy·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Jun 22, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

Field-dependent electron emission patterns from individual SWCNTs simulated with a multi-scale algorithm.

Weiliang Wang¹, Ningsheng Xu, Zhibing Li

¹State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, China.

Ultramicroscopy

|June 23, 2009

Summary

This summary is machine-generated.

The study numerically simulated electron distribution in single-walled carbon nanotubes (CNTs) under field emission. Emission patterns change with applied field, with (7,0) CNT symmetry breaking at lower fields.

More Related Videos

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Related Experiment Videos

Last Updated: Jun 22, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Single-walled carbon nanotubes (CNTs) are crucial nanomaterials with unique electronic properties.
Field emission from CNTs is vital for applications like electron sources and displays.
Understanding electron distribution under varying fields is key to optimizing CNT performance.

Purpose of the Study:

To numerically calculate and analyze the electron distribution of open-ended (7,0) and (5,5) single-walled carbon nanotubes (CNTs) under field emission conditions.
To investigate how applied macroscopic fields influence the field emission patterns and symmetry.
To determine the relationship between the applied field and the magnification factor.

Main Methods:

A multi-scaled algorithm was employed for calculating electron distribution.
Numerical simulations were used to generate field emission images.
Analysis focused on the changes in emission patterns and symmetry with varying applied fields.

Main Results:

Field emission patterns were found to change significantly with the applied macroscopic field.
The symmetry of the emission pattern for the (7,0) CNT exhibited breaking at lower fields, becoming less pronounced at higher fields.
The magnification factor was observed to increase as the applied macroscopic field strength increased.

Conclusions:

The electron distribution and emission patterns of CNTs are highly sensitive to applied electric fields.
The chirality of CNTs, specifically the (7,0) type, influences symmetry breaking under field emission.
Numerical simulations provide valuable insights into CNT field emission behavior, aiding in device design and optimization.