Chemistry??

Cox, Larry W.

doi:10.1021/ed035p263

Cited by 1 publication

(1 citation statement)

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“…One arises from the restricting influence of the dimensions of a nanoparticle on its quantum mechanical, independent electron states. In the so-called quantum dot [28], this feature allows luminescence to be controlled by particle size. For example, the number and energy distribution of electron states in CdSe crystals (A) depends on the crystal dimension when less than about 10 nm.…”

Section: Passive Interfacesmentioning

confidence: 99%

Interfaces: nanometric dielectrics

Lewis¹

2005

J. Phys. D: Appl. Phys.

433

278

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The incorporation of nanometric size particles in a matrix to form dielectric composites shows promise of materials (nanodielectrics) with new and improved properties. It is argued that the properties of the interfaces between the particles and the matrix, which will themselves be of nanometric dimensions, will have an increasingly dominant role in determining dielectric performance as the particle size decreases. The forces that determine the electrical and dielectric properties of interfaces are considered, with emphasis on the way in which they might influence composite behaviour. A number of examples are given in which interfaces at the nanometric level exercise both passive and active control over dielectric, optical and conductive properties. Electromechanical properties are also considered, and it is shown that interfaces have important electrostrictive and piezoelectric characteristics. It is demonstrated that the process of poling, namely subjecting macroscopic composite materials to electrical stress and raised temperatures to create piezoelectric materials, can be explained in terms of optimizing the collective response of the nanometric interfaces involved. If the electrical and electromechanical features are coupled to the long-established electrochemical properties, interfaces represent highly versatile active elements with considerable potential in nanotechnology.

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Section: Passive Interfacesmentioning

confidence: 99%