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RISS 인기검색어
- 검색키워드
- 저자 : Diroll, Benjamin T. (검색결과 2 건)
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Martirez, John Mark P.,Kim, Seungchul,Morales, Erie H.,Diroll, Benjamin T.,Cargnello, Matteo,Gordon, Thomas R.,Murray, Christopher B.,Bonnell, Dawn A.,Rappe, Andrew M. American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.8
<P>In addition to composition, the structure of a catalyst is another fundamental determinant of its catalytic reactivity. Recently, anomalous Ti oxide-rich surface phases of ternary oxides have been stabilized as nonstoichiometric epitaxial overlayers. These structures give rise to different modes of oxygen binding, which may lead to different oxidative chemistry. Through density functional theory investigations and electrochemical measurements, we predict and subsequently show that such a TiO<SUB>2</SUB> double-layer surface reconstruction enhances the oxygen evolving activity of the perovskite-type oxide SrTiO<SUB>3</SUB>. Our theoretical work suggests that the improved activity of the restructured TiO<SUB>2</SUB>(001) surface toward oxygen formation stems from (i) having two Ti sites with distinct oxidation activity and (ii) being able to form a strong O–O moiety (which reduces overbonding at Ti sites), which is a direct consequence of (iii) having a labile lattice O that is able to directly participate in the reaction. Here, we demonstrate the improvement of the catalytic performance of a well-known and well-studied oxide catalyst through more modern methods of materials processing, predicted through first-principles theoretical modeling.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2015/jacsat.2015.137.issue-8/ja511332y/production/images/medium/ja-2014-11332y_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja511332y'>ACS Electronic Supporting Info</A></P>
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Exploiting the colloidal nanocrystal library to construct electronic devices
Choi, Ji-Hyuk,Wang, Han,Oh, Soong Ju,Paik, Taejong,Sung, Pil,Sung, Jinwoo,Ye, Xingchen,Zhao, Tianshuo,Diroll, Benjamin T.,Murray, Christopher B.,Kagan, Cherie R. American Association for the Advancement of Scienc 2016 Science Vol.352 No.6282
<P>Synthetic methods produce libraries of colloidal nanocrystals with tunable physical properties by tailoring the nanocrystal size, shape, and composition. Here, we exploit colloidal nanocrystal diversity and design the materials, interfaces, and processes to construct all-nanocrystal electronic devices using solution-based processes. Metallic silver and semiconducting cadmium selenide nanocrystals are deposited to form high-conductivity and high-mobility thin-film electrodes and channel layers of field-effect transistors. Insulating aluminum oxide nanocrystals are assembled layer by layer with polyelectrolytes to form high-dielectric constant gate insulator layers for low-voltage device operation. Metallic indium nanocrystals are codispersed with silver nanocrystals to integrate an indium supply in the deposited electrodes that serves to passivate and dope the cadmiumselenide nanocrystal channel layer. We fabricate all-nanocrystal field-effect transistors on flexible plastics with electron mobilities of 21.7 square centimeters per volt-second.</P>
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