Judges’ Queries and Presenter’s Replies

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Presentation Discussion

  • Icon for: Daniel Schwartz

    Daniel Schwartz

    Faculty
    May 24, 2012 | 01:15 p.m.

    Hi Giselle:
    Great title…it sucked me in. Once sucked in, I saw it was an electrochemical intercalation and Raman Spectroscopy poster. You cite Ca(II) intercalated graphite as the superconductor, but it looks like the initial work is using Li(I). Have other folks demonstrated reversible electrochemical calcium intercalation/deintercalation for these materials from these electroplytes? I don’t know this specific literature, but sometimes the bare ion or solvated ion size excludes intercalation in other systems. Thanks, I liked the poster.

  • Icon for: Giselle Elbaz

    Giselle Elbaz

    Presenter
    May 24, 2012 | 05:50 p.m.

    Hi,

    Thanks for the comments. There is definitely precedent for intercalating Ca(II) and K(I) both in bulk graphite as well as graphene. To my knowledge though, no one has attempted yet to intercalate either one in graphene using electrochemistry specifically. We began with Li(I) because there was much precedent in the literature, (mostly aimed towards Li-ion batteries,) to use electrochemistry and there are some theoretical predictions which support the fact that while the bulk graphite system is not superconductive, the graphene system will be. We have however recently begun working with potassium as well in a nearly identical system, electrolyte and all, and the signs for intercalation seem promising. Since another group has recently been able to detect superconductivity in K(I)-multilayer graphene samples, we are hopeful to be able to really study these systems with more control and in finer detail.

    Best regards,
    Giselle

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    Mordechai Sharaby

    Guest
    May 24, 2012 | 07:56 p.m.

    un believable job

  • Further posting is closed as the competition has ended.

Icon for: Giselle Elbaz

GISELLE ELBAZ

Columbia University
Years in Grad School: 1

Scotch Tape, N2 Pencils and Batteries: Junk Drawer or the Makings of a Superconductor?

Energy levels and their separation are one of the key contributors to electronic properties observed in materials. One such level, the Fermi level, is of particular import and one way to modify its position is by the application of an electric field across one’s sample. It has been predicted that if a certain net charge could be induced in graphene, an atomically thin sheet of graphite, the resultant field would cause the Fermi level to shift to the extent that superconductivity could be observed. Our goal is to use a technique known as electrochemistry to slide cations in between sheets of graphene, with the hope that this theoretical vision can be achieved.