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Topological insulators make nanogold a better catalyst

FRG: Quantum Tuning of Superconducting, Plasmonic , and Chemical Properties of Metallic Nanostructures Chih -Kang Shih, University of Texas at Austin, DMR 0906025. Topological insulators make nanogold a better catalyst. Top and side views of an Au-covered Bi-terminated Bi 2 Se 3 film.

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Topological insulators make nanogold a better catalyst

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  1. FRG: Quantum Tuning of Superconducting, Plasmonic, and Chemical Properties of Metallic NanostructuresChih-Kang Shih, University of Texas at Austin, DMR 0906025 Topological insulators make nanogold a better catalyst Top and side views of an Au-covered Bi-terminated Bi2Se3 film Surface states—the electronic states emerging as a solid material terminates at a surface—are usually vulnerable to contaminations and defects. The robust topological surface state(s) (TSS) on the three dimensional topological insulators provide a perfect platform for exploiting surface states in less stringent environments. Employing first-principles density functional theory calculations, we demonstrate that the TSS can play a vital role in facilitating surface reactions by serving as an effective electron bath. We use CO oxidation on gold-covered Bi2Se3 as a prototype example, and show that the robust TSS can significantly enhance the adsorption energy of both CO and O2 molecules, by promoting different directions of static electron transfer. The concept of TSS as an electron bath may lead to new design principles beyond the conventional d-band theory of heterogeneous catalysis Opposite shift of topological surface bands upon CO/O2 adsorption Illustration of the “electron reservoir” effect of surface states http://link.aps.org.ezproxy.lib.utexas.edu/doi/10.1103/PhysRevLett.107.056804

  2. FRG: Quantum Tuning of Superconducting, Plasmonic, and Chemical Properties of Metallic NanostructuresChih-Kang Shih, University of Texas at Austin, DMR 0906025 Educational Outreach – Making Research Efforts Accessible to Broad Audiences As part of our educational outreach to a broader audience at all levels, we have enhanced the outreach program of Summer Academy of Nanoscience and Nanotechnology for Texas state-wide middle and high school teachers and students. Callie, a high school student interning in the lab, designing a scissor lift for a transport chamber. As seen on the right, the lift is already in use. In addition, our lab has participated in several other outreach programs, including hosting two high school student interns this year as part of the Alice in Wonderland program. In addition, lab tours are given to students visiting through a variety of other programs. These include question-answer sessions with graduate student researchers. Charlotte, leading high school students on a lab tour.

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