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|Title:||ALS-CXRO Seminar | Delia Milliron (LBL)|
|When:||11/28/2012 3:00 PM - 4:00 PM|
|Description:||ALS-CXRO Seminar Series|
Wed, November 28, 2012
Assembling mesostructured electronic materials from colloidal nanocrystals
The integration of inorganic nanocrystals as building units into mesoscale architectures yields materials wherein the components and their interfaces are both essential in defining electronic functionality. Colloidal synthesis has advanced such that we can create building blocks with complex targeted composition and properties, aided in part by high- throughput workflows. Now, the opportunity lies in building functional materials from these, including nanocrystals as well as heterogeneous building blocks such as inorganic clusters and block copolymers.
I will describe the formation of electronically conducting porous networks of doped metal oxide nanocrystals, which led to our demonstration of dynamic electrochemical plasmon modulation over an extraordinary spectral range. This phenomenon holds promise for a new breed of smart, energy-saving window coatings. Next, I will describe our fabrication of inorganic nanocrystal-in-glass composite materials from metal chalcogenide and metal oxide components. We find that the crystal-glass interfaces induce substantial restructuring of the amorphous network structure, substantially enhancing ionic transport. Our composite electrochromics uniquely exhibit dual-spectral band switching and their optical contrast is enhanced about 4 times by interface reconstruction. Finally, I will discuss the assembly of colloidal nanocrystals into mesoporous architectures through the molecular design of block copolymer templating agents. I will illustrate the potential for new functionality in such architectures with the example of a highly durable, high rate lithium ion battery electrode. The potential applications are expansive since conducting, electrochemically active, magnetic, and catalytic materials can all be crafted into mesoporous structures by our approach.