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Related Experiment Video

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

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Co-operativity in a nanocrystalline solid-state transition.

Sarah L White¹, Jeremy G Smith¹, Mayank Behl²

¹Department of Chemistry, University of Illinois at Urbana Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Nature Communications

|December 17, 2013

Summary

This summary is machine-generated.

This study reveals atomic-level co-operativity in inorganic cadmium selenide nanocrystals reacting with copper ions. This cooperative doping drives a phase transition, demonstrating a novel phenomenon in materials science.

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Area of Science:

Materials Science
Solid-State Chemistry
Nanotechnology

Background:

Co-operativity, a phenomenon where initial events influence subsequent ones, is well-known in biology.
Such cooperative effects have not been clearly demonstrated at the atomic level in inorganic materials.

Purpose of the Study:

To investigate atomic-level co-operativity in inorganic materials.
To explore the reaction dynamics between cadmium selenide nanocrystals and copper ions.

Main Methods:

Utilized a thousand-atom cadmium selenide nanocrystal (NC).
Studied the reaction with copper ions, observing doping behavior.
Employed optical spectroscopy and electron diffraction to analyze the NC's transformation.

Main Results:

Observed strong positive co-operativity in the doping of cadmium selenide NCs with copper.
A few copper impurities induced further doping, leading to an abrupt transition to the copper selenide phase.
Sigmoidal response curves in spectroscopy and diffraction confirmed the cooperative transition.

Conclusions:

Demonstrated unique evidence of atomic-level co-operativity in an inorganic solid.
Cooperative phenomena are significant in solid-state transformations like phase nucleation and crystal growth.
This finding opens new avenues for understanding and controlling materials' chemical transformations.