Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

12.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.0K
Structural Isomerism02:34

Structural Isomerism

16.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
16.8K
Ferromagnetism01:31

Ferromagnetism

2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.8K
Valence Bond Theory02:42

Valence Bond Theory

8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.8K
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

104
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
104
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.3K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.3K

You might also read

Related Articles

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

Sort by
Same author

Alignment switching in 3D-printed smectic liquid crystal elastomers.

Nature communications·2026
Same author

Laser Preset of MnO<sub>x</sub> Layer on High-Entropy Alloy Surface for Ampere-Level Ultra-Stable OER Performance.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Reconstruction of Ultrafine MnS-Induced Vacancy-Rich Co<sub>9</sub>S<sub>6.29</sub> Precatalysts in Mesoporous S-Doped N-Rich Hollow Carbon Nanotubes Enables Dynamic O-Vacancy Cycling for High-Performance Zn-Air Batteries.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

A minimally invasive approach to esophagojejunostomy leakage: a retrospective cohort study of the efficacy of endoscopic Histoacryl injection compared with conventional treatments.

Annals of surgical treatment and research·2026
Same author

Dimensionality-controlled alginate-based composite hydrogel electrolytes for low-tortuosity ion transport in long-life aqueous zinc-ion hybrid capacitors.

Carbohydrate polymers·2026
Same author

Next-Generation Sequencing Dataset Downloader and In Silico Sequence Mining: Graphical-User-Interface-Based Tools for Accessible, Multiprobe Target Mining in Next-Generation Sequencing Data.

Computational and structural biotechnology journal·2026

Related Experiment Video

Updated: Apr 22, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.5K

Ferromagnetic Cobalt Oxide With Structural Distortion and Oxidation State Changes for Hydrogen Sulfide Gas Detection.

Shin Joon Kang1,2, Chang Yoon Kim1, Min Chan Kim3

  • 1School of Mechanical Engineering and Department of Smart Fab. Technology, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|April 21, 2026
PubMed
Summary

This study introduces a novel method to create magnetic cobalt oxide micropillar arrays for enhanced hydrogen sulfide (H2S) gas sensing. The new material significantly improves sensor sensitivity and selectivity.

Keywords:
Co3O4H2S gas sensoraligned structureferromagneticlithiation‐based galvanostatic reduction

More Related Videos

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.1K
Hydrogen Charging of Aluminum using Friction in Water
07:50

Hydrogen Charging of Aluminum using Friction in Water

Published on: January 28, 2020

5.8K

Related Experiment Videos

Last Updated: Apr 22, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.5K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.1K
Hydrogen Charging of Aluminum using Friction in Water
07:50

Hydrogen Charging of Aluminum using Friction in Water

Published on: January 28, 2020

5.8K

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Magnetic assembly of ferromagnetic materials can create micropillar arrays to improve H2S gas sensors.
  • Current methods are limited to iron oxide, which is not ideal for H2S detection.
  • Cobalt oxide is suitable for H2S detection but is naturally antiferromagnetic.

Purpose of the Study:

  • To induce a ferromagnetic moment in cobalt oxide (Co3O4) for fabricating enhanced H2S gas sensor micropillar arrays.
  • To investigate the effect of a novel material synthesis on H2S gas-sensing performance.
  • To develop a sensor with improved gas adsorption and electron transfer.

Main Methods:

  • Synthesized a novel material (LiGr-Co) using lithiation-based galvanostatic reduction (LiGr).
  • Characterized the material for its Co3O4/CoO heterointerface, particle size, and oxygen vacancies.
  • Fabricated aligned LiGr-Co (A-LiGr-Co) sensor arrays using magnetic field-assisted spray coating.

Main Results:

  • The LiGr-Co material exhibited sub-nanometer particles and oxygen vacancies, enhancing H2S sensing.
  • A Co3O4/CoO heterointerface was formed, inducing a magnetic moment via crystallographic mistilt.
  • The A-LiGr-Co sensor showed a high response (39.7 at 5 ppm) and selectivity for H2S at 150°C.

Conclusions:

  • The developed LiGr-Co material and A-LiGr-Co sensor effectively enhance H2S gas detection.
  • The combination of nanostructure, heterointerface, and magnetism is key to improved sensor performance.
  • This work presents a viable pathway for creating advanced magnetic gas sensors.