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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

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Published on: August 28, 2018

Double-Exchange Effect in Two-Dimensional MnO₂ Nanomaterials.

Xu Peng¹, Yuqiao Guo¹, Qin Yin¹

¹Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), CAS Center for Excellence in Nanoscience, and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China , Hefei, Anhui 230026, P. R. China.

Journal of the American Chemical Society

|March 18, 2017

Summary

This summary is machine-generated.

Researchers induced a near-room-temperature metal-insulator transition in 2D manganese dioxide (MnO2) nanomaterials. This transition exhibits ultrahigh negative magnetoresistance, paving the way for advanced smart devices.

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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Published on: November 12, 2016

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Electronic state transitions, particularly metal-insulator transitions (MIT), are crucial for energy applications and smart devices.
Few simple metal oxides exhibit electronic state transitions near room temperature, limiting their practical use.

Purpose of the Study:

To demonstrate the chemical induction of a near-room-temperature MIT in two-dimensional (2D) nanomaterials.
To explore the potential of double-exchange effects in 2D materials for novel electronic properties.

Main Methods:

Chemically regulating the valence state of 2D manganese dioxide (MnO2) nanosheets.
Inducing a Mn(III)-O-Mn(IV) structure to facilitate the double-exchange effect.
Experimentally characterizing the electronic transitions and magnetoresistance (MR) properties.

Main Results:

Achieved a near-room-temperature MIT in 2D MnO2 nanomaterials via chemical induction of double-exchange.
Observed an ultrahigh negative MR value of -11.3% (at 0.1 T) at 287 K, the highest reported for 2D nanomaterials near room temperature.
Demonstrated a significant infrared response with a 7.1% transmittance change between 270 K and 290 K.

Conclusions:

Dimensional confinement of the double-exchange structure in 2D MnO2 nanosheets enables significant magneto-transport properties.
The observed ultrahigh negative MR and infrared response suggest potential for sensitive smart device applications.