Magnetic and Metallic Metalattices: A Transferrable Nanocasting by Confined Supercritical Fluid Chemical Deposition

Restricted (Penn State Only)
Author:
Liu, Yunzhi
Graduate Program:
Chemistry
Degree:
Doctor of Philosophy
Document Type:
Dissertation
Date of Defense:
August 15, 2018
Committee Members:
  • John V Badding, Dissertation Advisor
  • John V Badding, Committee Chair
  • Benjamin James Lear, Committee Member
  • Miriam Arak Freedman, Committee Member
  • Venkatraman Gopalan, Outside Member
Keywords:
  • 3D artificial lattices
  • inverse opal
  • supercritical fluid chemical deposition
  • chemical fluid deposition
  • spin-engineered meta-materials
  • plasmonic meta-materials
  • metalattices
  • nanocasting
Abstract:
Metal metalattices are artificial metallic nanostructured solids of 3-D order with periods between 1 nm – 100 nm. When a metal is confined in such a geometry, the intrinsic electron mean free path and magnetic characteristic length are at the same length-scale as the periodicity. Thus the interaction between the intrinsic physical parameters with the structural parameters can lead to novel magnetic, electric and plasmonic phenomena. The concept of metal metalattices have been brought up at the beginning of this century, and simulations have suggested novel physics in them. However, due to the difficulties in synthesis, metal metalattices have not been available for more than one decade after the simulation work, and thus no experimental measurements can be done to verify and adjust the theory. Here we present a newly established synthesis method, called confined supercritical fluid chemical deposition, from which we are able to make metalattices with different metals. Such success in synthesis is the first milestone in developing this type of artificial solids. Property measurements on these metalattices have shown the specific metalattices behaviors that are different from both nanoparticles and bulk, and that the periodic and interconnecting features make them different from other artificial geometries.