scholarly journals Electrodeposition of High-Functional Metal Oxide on Noble Metal for MEMS Devices

2019 ◽  
Author(s):  
Wan-Ting Chiu ◽  
Chun-Yi Chen ◽  
Tso-Fu Mark Chang ◽  
Tomoko Hashimoto ◽  
Hiromichi Kurosu
Keyword(s):  
Metal Oxide ◽  
Noble Metal ◽  
Mems Devices

scholarly journals Exterior and Internal Uniform Loading of Pt Nanoparticles on Yolk-Shell La2O3 by Acoustic Levitation Synthesis with Enhanced Photocatalytic Performance

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 107 ◽  
Author(s):  
Ming Qin ◽  
Qing Chang ◽  
Yinkai Yu ◽  
Hongjing Wu
Keyword(s):  
Metal Oxide ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Shell Structure ◽  
Photocatalytic Performance ◽  
Chemical Interaction ◽  
Pt Nanoparticles ◽  
Noble Metal Nanoparticles ◽  
Homogeneous Distribution ◽  
Acoustic Levitation

By the deposition of noble metal nanoparticles on a metal oxide substrate with a specific micro-/nanostructure, namely, yolk-shell structure, a remarkable improvement in photocatalytic performance can be achieved by the composites. Nevertheless, noble metal nanoparticles only distribute on the surface shell of metal oxide substrates when the conventional wet-chemistry reduction approach is employed. Herein, we proposed a novel acoustic levitation synthesis of Pt nanoparticles deposited on yolk-shell La2O3. The composites not only displayed well-defined, homogeneous distribution of Pt NPs on the exterior shell of La2O3 and the interior La2O3 core, but an enhanced chemical interaction between Pt and La2O3. The unique structure not only can display improved photocatalytic degradation rate toward methyl orange, but also may show great potential in fields of hydrogen generation, environmental protection, etc. The novel acoustic levitation synthesis can supplement the methodology of synthesizing well dispersed noble metal oxides over the whole yolk-shell structure through noble metal NPs deposition method.

Mn3O4 doped with highly dispersed Zr species: a new non-noble metal oxide with enhanced activity for three-way catalysis

2016 ◽  
Vol 40 (12) ◽  
pp. 10108-10115 ◽  
Author(s):  
Genyuan Zhao ◽  
Jing Li ◽  
Wenshuang Zhu ◽  
Xueqin Ma ◽  
Yonghua Guo ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Manganese Oxide ◽  
Noble Metal ◽  
Storage Capacity ◽  
Catalytic Properties ◽  
Oxygen Storage Capacity ◽  
Oxide Catalysts ◽  
Oxygen Storage ◽  
Highly Dispersed ◽  
Three Way Catalysis

Herein, we demonstrate the influence of zirconium species on promoting the oxygen storage capacity and three-way catalytic properties of zirconium-manganese oxide catalysts.

Design and engineering of high-performance photocatalytic systems based on metal oxide–graphene–noble metal nanocomposites

2017 ◽  
Vol 2 (4) ◽  
pp. 422-439 ◽  
Author(s):  
Narendra Singh ◽  
Jai Prakash ◽  
Raju Kumar Gupta
Keyword(s):  
Metal Oxide ◽  
Noble Metal ◽  
High Performance ◽  
Optoelectronic Properties ◽  
Functional Nanomaterials ◽  
Metal Nanocomposites ◽  
Structural And Optoelectronic Properties

Coupling metal oxide photocatalysts with functional nanomaterials such as noble metal- and molecular graphene-based nanostructures and engineering their structural and optoelectronic properties can lead to high-performance photocatalytic systems.

scholarly journals Rhodium Oxide Surface-Loaded Gas Sensors

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 892 ◽  
Author(s):  
Anna Staerz ◽  
Inci Boehme ◽  
David Degler ◽  
Mounib Bahri ◽  
Dmitry Doronkin ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Noble Metal ◽  
Noble Metals ◽  
Metal Cluster ◽  
Empirical Work ◽  
Oxide Surface ◽  
Metallic State ◽  
X Ray ◽  
Rhodium Clusters ◽  
Sensing Characteristics

In order to increase their stability and tune-sensing characteristics, metal oxides are often surface-loaded with noble metals. Although a great deal of empirical work shows that surface-loading with noble metals drastically changes sensing characteristics, little information exists on the mechanism. Here, a systematic study of sensors based on rhodium-loaded WO3, SnO2, and In2O3—examined using X-ray diffraction, high-resolution scanning transmission electron microscopy, direct current (DC) resistance measurements, operando diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, and operando X-ray absorption spectroscopy—is presented. Under normal sensing conditions, the rhodium clusters were oxidized. Significant evidence is provided that, in this case, the sensing is dominated by a Fermi-level pinning mechanism, i.e., the reaction with the target gas takes place on the noble-metal cluster, changing its oxidation state. As a result, the heterojunction between the oxidized rhodium clusters and the base metal oxide was altered and a change in the resistance was detected. Through measurements done in low-oxygen background, it was possible to induce a mechanism switch by reducing the clusters to their metallic state. At this point, there was a significant drop in the overall resistance, and the reaction between the target gas and the base material was again visible. For decades, noble metal loading was used to change the characteristics of metal-oxide-based sensors. The study presented here is an attempt to clarify the mechanism responsible for the change. Generalities are shown between the sensing mechanisms of different supporting materials loaded with rhodium, and sample-specific aspects that must be considered are identified.

scholarly journals Surface modification of plasmonic noble metal–metal oxide core–shell nanoparticles

2019 ◽  
Vol 1 (12) ◽  
pp. 4578-4591 ◽  
Author(s):  
Somayeh Talebzadeh ◽  
Clémence Queffélec ◽  
D. Andrew Knight
Keyword(s):  
Surface Modification ◽  
Metal Oxide ◽  
Noble Metal ◽  
Molecular Ions ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Metal Metal ◽  
Comprehensive Survey ◽  
Core Shell Nanoparticles

A comprehensive survey on methods for surface modification of noble metal–metal oxide core–shell nanoparticles is presented and highlights various strategies for binding of molecules and molecular ions to core–shell nanoparticles.

Modular Design of Noble‐Metal‐Free Mixed Metal Oxide Electrocatalysts for Complete Water Splitting

2019 ◽  
Vol 131 (14) ◽  
pp. 4692-4696 ◽  
Author(s):  
Dandan Gao ◽  
Rongji Liu ◽  
Johannes Biskupek ◽  
Ute Kaiser ◽  
Yu‐Fei Song ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Water Splitting ◽  
Noble Metal ◽  
Modular Design ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Metal Free

scholarly journals Nanoplasmon–Semiconductor Hybrid for Interface Catalysis

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 429 ◽  
Author(s):  
Jingang Wang ◽  
Naixing Feng ◽  
Ying Sun ◽  
Xijiao Mu
Keyword(s):  
Optical Properties ◽  
Metal Oxide ◽  
Noble Metal ◽  
Hybrid System ◽  
Physical Mechanism ◽  
Theoretical Calculations ◽  
Experimental Investigations ◽  
Exciton Coupling ◽  
Surface Catalysis ◽  
Metal Metal

We firstly, in this review, introduce the optical properties of plasmonic metals, and then focus on introducing the unique optical properties of the noble metal–metal-oxide hybrid system by revealing the physical mechanism of plasmon–exciton interaction, which was confirmed by theoretical calculations and experimental investigations. With this noble metal–metal-oxide hybrid system, plasmonic nanostructure–semiconductor exciton coupling interactions for interface catalysis has been analyzed in detail. This review can provide a deeper understanding of the physical mechanism of exciton–plasmon interactions in surface catalysis reactions.

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