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Robinson Group

Tuesday, March 8, 2016

The Robinson group's work on "nano-hamburgers" is featured in Scientific American, Israel ed.

The work features their nano-hamburger metastable structures, made through cation exchange. In this work, the group developed a means to strain tune the plasmon in Cu2-xS, demonstrating a means to decouple the optical properties (plasmon) from the crystal phase. Using Cu-Zn-S nano-heterostructures that they built using cation exchange, they find, to their surprise, that the center layer of Cu2-xS undergoes a solid-solid phase transformation from the initially metastable phase (x=1.81) to its lower energy phase of djurleite (Cu1.94S), but then returns back again to the higher energy phase x=1.81 due to strain stabilization with the epitaxial interfaces between layers. The plasmon, however, does not obey the crystal phase; the metastable phase no longer supports a plasmon in the smaller structures. This work demonstrates novel routes to composition control in nanoparticles through chemical transformation.

Nano Letters article can be found here:

http://dx.doi.org/10.1021/nl5035607  

D.-H. Ha, A.H. Caldwell, M.J. Ward, S. Honrao, K. Mathew, R. Hovden, M.K.A. Koker, D.A. Muller, R.G. Hennig, and R.D. Robinson, “Solid-Solid Phase Transformations Induced through Cation Exchange and Strain, in 2D Heterostructured Copper Sulfide Nanocrystals,” Nano Letters 14, 7090–7099 (2014). 

 Scientific American Israel article found here:

http://www.sciam.co.il/%D7%A0%D7%A0%D7%95%D7%98%D7%9B%D7%A0%D7%95%D7%9C%D7%95%D7%92%D7%99%D7%94-%D7%9E%D7%93%D7%A2-%D7%91%D7%94%D7%AA%D7%91%D7%92%D7%A8%D7%95%D7%AA/

 

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