An Ivestigation of Temperature-Manipulated Size and Shape Evolution of Preformed Core-Shell Nanoparticles

1999 ◽  
Vol 580 ◽  
Author(s):  
M.M. Maye ◽  
W.X. Zheng ◽  
F.L. Leibowitz ◽  
N.K. Ly ◽  
H.H. Eichelberger ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Ftir Spectroscopy ◽  
Shape Change ◽  
Composite Nanoparticles ◽  
Core Shell ◽  
Shape Evolution ◽  
Shell Nanoparticles ◽  
Size And Shape ◽  
Core Shell Nanoparticles ◽  
Encapsulated Nanoparticles

AbstractThis paper presents a study of heating-induced size and shape change for pre-synthesized composite nanoparticles of ∼2 nm gold cores encapsulated with alkanethiolate monolayers. The results have demonstrated an evolution in size and shape of the nanoparticles towards monodispersed larger core sizes with well-defined and highly-faceted morphologies. The evolved particles were encapsulated with the thiolate shells. The morphological and structural evolutions were characterized using TEM, XRD, UV-Vis and FTIR spectroscopy. While temperature-driven crystal growth is known for non-encapsulated particles, the evolution of the thiolate-encapsulated nanoparticles in solutions into well-defined morphologies represents an intriguing example of temperature manipulations of nanoparticle monodispersity and shape.

Plasmonic core–shell nanoparticles for SERS detection of the pesticide thiram: size- and shape-dependent Raman enhancement

Nanoscale ◽  
2015 ◽  
Vol 7 (7) ◽  
pp. 2862-2868 ◽  
Author(s):  
Pengzhen Guo ◽  
Debabrata Sikdar ◽  
Xiqiang Huang ◽  
Kae Jye Si ◽  
Wei Xiong ◽  
...  
Keyword(s):  
Core Shell ◽  
Shell Nanoparticles ◽  
Size And Shape ◽  
Raman Enhancement ◽  
Sers Detection ◽  
Core Shell Nanoparticles

scholarly journals Size- and Shape-Controlled Synthesis and Properties of Magnetic–Plasmonic Core–Shell Nanoparticles

2016 ◽  
Vol 120 (19) ◽  
pp. 10530-10546 ◽  
Author(s):  
Elyahb Allie Kwizera ◽  
Elise Chaffin ◽  
Xiao Shen ◽  
Jingyi Chen ◽  
Qiang Zou ◽  
...  
Keyword(s):  
Core Shell ◽  
Controlled Synthesis ◽  
Shell Nanoparticles ◽  
Size And Shape ◽  
Shape Controlled ◽  
Core Shell Nanoparticles

Thermal Stability and Shape Evolution of Tetrahexahedral Au–Pd Core–Shell Nanoparticles with High-Index Facets

2013 ◽  
Vol 117 (13) ◽  
pp. 6896-6903 ◽  
Author(s):  
Rao Huang ◽  
Yu-Hua Wen ◽  
Gui-Fang Shao ◽  
Zi-Zhong Zhu ◽  
Shi-Gang Sun
Keyword(s):  
Thermal Stability ◽  
High Index ◽  
Core Shell ◽  
Shape Evolution ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Origin and shape evolution of core–shell nanoparticles in Au–Pd: from few atoms to high Miller index facets

2013 ◽  
Vol 15 (6) ◽  
Author(s):  
Nabraj Bhattarai ◽  
Gilberto Casillas ◽  
Subarna Khanal ◽  
J. Jesus Velazquez Salazar ◽  
Arturo Ponce ◽  
...  
Keyword(s):  
Core Shell ◽  
Shape Evolution ◽  
Shell Nanoparticles ◽  
Miller Index ◽  
Core Shell Nanoparticles

Thermally induced transformations of Au@Cu2O core–shell nanoparticles into Au–Cu nanoparticles from temperature-programmed in situ powder X-ray diffraction

2019 ◽  
Vol 52 (3) ◽  
pp. 579-586 ◽  
Author(s):  
Robert Koch ◽  
Guangfang Li ◽  
Shubham Pandey ◽  
Simon Phillpot ◽  
Hui Wang ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Shell Nanoparticles ◽  
Thermally Induced ◽  
X Ray ◽  
Cu Content ◽  
Temperature Programmed ◽  
Core Shell Nanoparticles

Temperature-programmed in situ X-ray diffraction with whole-powder-pattern modeling is used to investigate the reaction of Au@Cu2O core–shell nanoparticles to form nanocrystalline bimetallic Cu x Au1−x alloys (x = 0, 0.25, 0.5, 0.75, 1.0) in a reducing atmosphere. The mechanisms of the reactions are key to informed design of tailored non-equilibrium nanostructures for catalytic and plasmonic materials. The Au@Cu2O reaction is initiated by reduction of the Cu2O cuprite shell to form nanocrystalline metallic Cu at about 413 K. Alloying begins immediately upon formation of metallic Cu at 413 K, with the nucleation of an Au-rich alloy phase which reaches the nominal Cu content of the overall system stoichiometry by 493 K. All bimetallic alloys form a transient ordered Cu3Au intermetallic compound at intermediate temperatures, with the onset of ordering and subsequent disordering varying by composition. No evidence for an ordered Au3Cu intermetallic is found for any composition. Significant crystal growth in the bimetallic phase is apparent at higher temperatures, with the onset temperature increasing with Cu concentration and initial Cu-shell thickness. The reduction of the cuprite phase is slowed by the presence of the core–shell interface, and crystal growth in the Cu shell is completely suppressed within the alloy systems.

Preparation and Electrocatalytic Performance of Thin-shell Ni/Pt Core-shell Nanoparticles

2012 ◽  
Vol 27 (1) ◽  
pp. 95-101
Author(s):  
Shi-Bin LIU ◽  
Chun-Ying YANG ◽  
Zhong-Lin ZHANG ◽  
Dong-Hong DUAN ◽  
Xiao-Gang HAO ◽  
...  
Keyword(s):  
Thin Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Electrocatalytic Performance ◽  
Core Shell Nanoparticles
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