Defense Date

2010

Document Type

Thesis

Degree Name

Master of Science

Department

Engineering

First Advisor

Supriyo Bandyopadhyay

Abstract

Recently, it was found that the strongly temperature-dependent spin dephasing time of bound electrons in the organic molecule tris(8-hydroxyquinoline aluminum), or Alq3, increases when a few of these molecules are confined within 1-2 nm sized nanocavities in porous alumina. What causes this increase is not well understood, but one possibility is that the rotational/vibrational modes of the molecule are altered inside a nanocavity, leading to suppression of spin coupling with these modes and a concomitant increase in the spin dephasing time. To test this possibility, we have carried out mid-infrared spectroscopy of few molecule clusters confined within 1-2 nm sized nanocavities. Their spectrum is considerably different from that of bulk powders of molecules, indicating that at least some vibrational modes (in the mid infrared range) have been altered. This may be a possible cause for weakening of spin-environment coupling inside a nanocavity, resulting in an increase in the spin dephasing time.

Rights

© The Author

Is Part Of

VCU University Archives

Is Part Of

VCU Theses and Dissertations

Date of Submission

August 2010

Included in

Engineering Commons

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