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Bernardi, F.,Grass, M.E.,Hong, Y.P.,Chang, R.,Jabeen, N.,Zhang, C.,Eichhorn, B.W.,Seo, B.,Alayoglu, S.,Hussain, Z.,Joo, S.H.,Liu, Z. Elsevier Science Publishers 2016 CATALYSIS TODAY - Vol.260 No.-
<P>Rh0.5Pd0.5/CeO2 bimetallic nanoparticles were subjected to reducing and oxidizing atmospheres at different temperatures and characterized by means of the Ambient Pressure X-Ray Photoelectron Spectroscopy (AP-XPS). The surface atomic population is calculated for all cases. By using a high temperature pretreatment at 480 degrees C in H-2 atmosphere, it was possible to control the surface atomic population with Pd atoms frozen at the skin layer even in an oxidizing atmosphere, which is not observed without high temperature pre-treatment (Rh atoms at the skin layer). The change of the Rh/Pd surface segregation behavior after the high temperature pre-treatment is attributed to the geometrical factor of Strong Metal Support Interaction (SMSI) effect, i.e., the occurrence of the ceria capping layer around nanoparticles. (C) 2015 Elsevier B.V. All rights reserved.</P>
Chen, Weida D.,Kang, Seung-Kyun,Stark, Wendelin J.,Rogers, John A.,Grass, Robert N. Elsevier 2019 Sensors and actuators. B Chemical Vol.282 No.-
<P><B>Abstract</B></P> <P>Electronic systems with on-demand dissolution or destruction capabilities offer unusual opportunities in hardware-oriented security devices, advanced military spying and controlled biological treatment. Here, the dissolution chemistry of gold, generally known as inert metal, in potassium ferricyanide and potassium ferrocyanide solutions has been investigated upon light exposure. While a pure aqueous solution of potassium ferricyanide–K<SUB>3</SUB>[Fe(CN)<SUB>6</SUB>] does not dissolve gold, an aqueous solution of potassium ferrocyanide–K<SUB>4</SUB>[Fe(CN)<SUB>6</SUB>] irradiated with ambient light is able to completely dissolve a gold electrode within several minutes. Photo activation and dissolution kinetics were assessed at different initial pH values, light irradiation intensities and ferrocyanide concentrations. Addition of small amounts of the heavy metal thallium (260 ppb) also provides tunability of the dissolution kinetics. An investigation of the involved chemical and physical processes of photochemistry, cyanide diffusion and surface reaction results in an understanding of the rate limiting steps and yields an overall transformation of irradiated light energy to dissolved gold of 2.6%. A potential application of this novel gold dissolution method as a cumulative light sensor is demonstrated and discussed.</P>
Nonpercolative metal-insulator transition in VO2single crystals
Mun, Bongjin Simon,Chen, Kai,Yoon, Joonseok,Dejoie, Catherine,Tamura, Nobumichi,Kunz, Martin,Liu, Zhi,Grass, Michael E.,Mo, Sung-Kwan,Park, Changwoo,Lee, Y. Yvette,Ju, Honglyoul American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.11