Related Experiment Video
Updated: Aug 16, 2026

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
Published on: March 4, 2021
Anomalous n-p Sensing Conversion in Cobalt Ferrite: The Role of Surface Adsorption and Carrier Scattering
Tingyu Zhang1, Yifan Yang1, Qi Shu1
1School of Physical Science and Technology, Lanzhou University, Lanzhou730000, P. R. China.
Abstract:
Cobalt ferrite stands out as a versatile gas-sensing material, offering tunable composition and dual redox couples. We report a remarkable n-p sensing conversion in cobalt ferrite-based sensors-an anomalous resistance modulation that contradicts conventional intrinsic semiconductor behavior. While occasionally observed in metal oxides, such phenomena remain largely unexplored in the context of cobalt ferrite. Here, by regulating the proportion of metal elements in cobalt ferrite, we systematically decouple the unconventional sensing switching and the intriguing dynamic selectivity induced by diverse volatile organic compounds (VOCs) across a temperature range of 140-230 °C. Leveraging in situ XPS, Raman spectroscopy, and photoluminescence (PL), we propose a mechanistic framework: the competitive interplay between surface adsorbed oxygen and carrier scattering mechanisms governs the electronic transport. This study not only elucidates the underlying physics of the sensing conversion phenomenon but also establishes a fundamental "structure-chemistry-property" framework for the rational design of advanced cobalt ferrite gas sensors.
More Related Videos
08:31Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
Published on: February 10, 2021
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Related Concept Videos
Colors and Magnetism
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 eye.
π Electron Effects on Chemical Shift: Overview
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...