scholarly journals Grain-boundary-rich Pt nanoparticle assembly for catalytic hydrogen sensing at room temperature

2021 ◽  
Author(s):  
LONG LUO ◽  
Xin Geng ◽  
Shuwei Li ◽  
Jaeyoung Heo ◽  
Yi Peng ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Platinum Nanoparticles ◽  
High Performance ◽  
Room Temperature ◽  
Hydrogen Oxidation ◽  
Water Electrolysis ◽  
Nanoparticle Assembly ◽  
Platinum Nanoparticle ◽  
Hydrogen Sensing ◽  
Catalytic Hydrogen

We report a facile method of synthesizing grain-boundary(GB)-rich platinum nanoparticle assembly. GBs are formed between platinum nanoparticles during their random collision and attachment in solution driven by water electrolysis. The GB-rich nanoparticle assembly exhibits ~400-fold higher catalytic hydrogen oxidation rate than platinum nanoparticles before assembly, enabling catalytic hydrogen sensing at room temperature without external heating. Our sensor also demonstrates fast response/recovery (~7 s at >1% H2), nearly no signal variation during a 280-hour-long stability test, and high selectivity toward hydrogen over 36 interference gases. Furthermore, this sensor can be easily fabricated from commercial thermometers at a low cost (< $5 per unit). Theoretical calculation results reveal that the high performance of GB-rich platinum nanoparticle assembly arises from tensile strain at the GBs.

Effect of BaCO3 and Pb3O4 on Properties of BaTiO3-Based PTCR Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 349-352
Author(s):  
Wei Bing Ma ◽  
Yuan Fang Qu ◽  
Yan Xia Hao
Keyword(s):  
Electrical Properties ◽  
Grain Boundary ◽  
High Performance ◽  
Room Temperature ◽  
Sintering Behavior ◽  
Low Resistivity ◽  
Phase Constituent ◽  
Weak Reduction ◽  
Grain Boundary Resistivity

High-performance PTCR ceramics with low resistivity (8Ω.cm) at room temperature and around four orders magnitude of the PTCR jump were obtained by adding BaCO3 and Pb3O4(B-P) in BaTiO3. The influence of adding B-P on the sintering behavior, the microstructure and the electrical properties of BaTiO3-based PTCR was investigated. The phase constituent in the sintered ceramics was analyzed by XRD and it was shown that the metallic layered Ba3Pb2O7 phase was synthesized during the sintering. Analysis suggested that making the weak reduction atmosphere at the grain boundary may decrease the grain-boundary resistivity.

scholarly journals Catalytic hydrogen sensing using microheated platinum nanoparticle-loaded graphene aerogel

2015 ◽  
Vol 206 ◽  
pp. 399-406 ◽  
Author(s):  
Anna Harley-Trochimczyk ◽  
Jiyoung Chang ◽  
Qin Zhou ◽  
Jeffrey Dong ◽  
Thang Pham ◽  
...  
Keyword(s):  
Graphene Aerogel ◽  
Platinum Nanoparticle ◽  
Hydrogen Sensing ◽  
Catalytic Hydrogen

scholarly journals Palladium-Decorated Silicon Nanomesh Fabricated by Nanosphere Lithography for High Performance, Room Temperature Hydrogen Sensing

Small ◽  
2018 ◽  
Vol 14 (19) ◽  
pp. 1801271 ◽  
Author(s):  
Min Gao ◽  
Minkyu Cho ◽  
Hyeuk-Jin Han ◽  
Yeon Sik Jung ◽  
Inkyu Park
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Nanosphere Lithography ◽  
Hydrogen Sensing

Palladium-Decorated Silicon Nanomesh Fabricated by Nanosphere Lithography for High Performance, Room Temperature Hydrogen Sensing

Small ◽  
2018 ◽  
Vol 14 (10) ◽  
pp. 1703691 ◽  
Author(s):  
Min Gao ◽  
Minkyu Cho ◽  
Hyeuk-Jin Han ◽  
Yeon Sik Jung ◽  
Inkyu Park
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Nanosphere Lithography ◽  
Hydrogen Sensing

Platinum nanoparticles on electrospun titania nanofibers as hydrogen sensing materials working at room temperature

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 9177-9184 ◽  
Author(s):  
Ilaria Fratoddi ◽  
Antonella Macagnano ◽  
Chiara Battocchio ◽  
Emiliano Zampetti ◽  
Iole Venditti ◽  
...  
Keyword(s):  
Platinum Nanoparticles ◽  
Room Temperature ◽  
High Response ◽  
Hydrogen Sensing ◽  
Titania Nanofibers

Pt–TiO2 were prepared as hydrogen sensing materials showing (at room temperature, under UV) enhancement of photoconductivity and high response.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Characterization of intergranular cuprous oxide in polycrystalline YBa2Cu3O7-x

1988 ◽  
Vol 46 ◽  
pp. 880-881
Author(s):  
Bradley L. Thiel ◽  
Chan Han R. P. ◽  
Kurosky L. C. Hutter ◽  
I. A. Aksay ◽  
Mehmet Sarikaya
Keyword(s):  
Grain Boundary ◽  
Cuprous Oxide ◽  
Room Temperature ◽  
Boundary Phase ◽  
Spectroscopic Techniques ◽  
Transition Width ◽  
Practical Applications ◽  
Thin Foils ◽  
Superconducting Oxides

The identification of extraneous phases is important in understanding of high Tc superconducting oxides. The spectroscopic techniques commonly used in determining the origin of superconductivity (such as RAMAN, XPS, AES, and EXAFS) are surface-sensitive. Hence a grain boundary phase several nanometers thick could produce irrelevant spectroscopic results and cause erroneous conclusions. The intergranular phases present a major technological consideration for practical applications. In this communication we report the identification of a Cu2O grain boundary phase which forms during the sintering of YBa2Cu3O7-x (1:2:3 compound).Samples are prepared using a mixture of Y2O3. CuO, and BaO2 powders dispersed in ethanol for complete mixing. The pellets pressed at 20,000 psi are heated to 950°C at a rate of 5°C per min, held for 1 hr, and cooled at 1°C per min to room temperature. The samples show a Tc of 91K with a transition width of 2K. In order to prevent damage, a low temperature stage is used in milling to prepare thin foils which are then observed, using a liquid nitrogen holder, in a Philips 430T at 300 kV.

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