CAREER: Chemically Modified Ternary Chalcogenide Materials
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CAREER: Chemically Modified Ternary Chalcogenide Materials Benjamin R. Martin, Texas State University - San Marcos, DMR 0748140.

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Reducing Current

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Reducing current

CAREER: Chemically Modified Ternary Chalcogenide MaterialsBenjamin R. Martin, Texas State University - San Marcos, DMR 0748140

  • Teams of undergraduate researchers continue to probe the propensity for ‘soft’ crystalline materials (containing large anions such as sulfur or selenium) to undergo low temperature reactions for controlled structural manipulations. Products of these reactions are desirable for their tunable electronic properties (bandgap, magnetic, etc.) and enhanced ion conductivity for energy storage.

  • Controlled ion exchange/removal in these compounds remains a challenge due to the high mobility of all species, which may result in structural collapse or rearrangement. Current research directions addressing this include:

  • Increasing framework rigidity using high oxidation state metals (V5+, etc.)

  • Examining the strengthening effect of other large anions in layered structures, such as As3-

  • ‘Pinning’ regions of a structure using high energy interactions, such as Ba-S and Cu-S bonding.

  • Exploring solvent assisted expansion of crystal lattices to facilitate ion motion

Voltammogram (vs. Li) comparing MoS2(blue) with MoS2 exposed to barium (Ba0.05MoS2). Adsorbed barium forms an impermeable barrier, preventing ion transfer.

Ba0.05MoS2

Reducing

Current

MoS2

Layered arsenide structures, emphasizing exchangeable potassium ions

(in blue)

KMnAs

KFe2As2

LiVS2

Powder diffraction patterns demonstrating reversible redox cycling

LiBH4 reduction

Li0.7VS2

I2 oxidation

LiVS2


Reducing current

CAREER: Chemically Modified Ternary Chalcogenide MaterialsBenjamin R. Martin, Texas State University - San Marcos, DMR 0748140

“Family Science Night” was established in 2008 as a component of this award to encourage parents to conduct science experiments with their children. Undergraduate science majors guide groups through hands-on experiments at elementary schools.

The event is now tied to child-friendly holiday themes, and publicized using flyers, announcements, and a phone message alert to parents. Attendance now exceeds 100 families at an event (a 500% increase).

The challenge remains to maintain parent involvement as the event grows in popularity.

Invitation to the Spring, 2011 Family Science Night Activity, which drew hundreds of participants.


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