PLASMON ABSORPTION OF GOLD NANOPARTICLES AND THEIR MORPHOLOGIES OBSERVED BY AFM

1996 ◽  
Vol 03 (01) ◽  
pp. 1153-1156 ◽  
Author(s):  
H. ISHIKAWA ◽  
T. IDA ◽  
K. KIMURA
Keyword(s):  
Heat Treatment ◽  
Gold Nanoparticles ◽  
Atomic Force Microscopy ◽  
Absorption Spectrum ◽  
Color Change ◽  
Island Film ◽  
Plasmon Absorption ◽  
Force Microscopy ◽  
Atomic Force

We have studied the effect of heat treatment on Au-island film prepared by a sputtering method, atomic force microscopy (AFM), and UV-VIS spectrophotometry. The structure and absorption spectrum of Au-island film are significantly changed by heat treatment, which corresponds to the visible color change from blue to red. In order to elucidate the relation between the structural and optical changes, we have simulated the change of spectrum using the Maxwell-Garnett theory. The calculated spectra are qualitatively in agreement with the experimental spectra.

Identification of Size Differences of Gold Nanoparticles on Cell Surface by Curvature Reconstruction Method Using Atomic Force Microscopy

2007 ◽  
Vol 46 (No. 8) ◽  
pp. L184-L186 ◽  
Author(s):  
Hyonchol Kim ◽  
Koudai Oikawa ◽  
Naoya Watanabe ◽  
Masatsugu Shigeno ◽  
Yoshiharu Shirakawabe ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Atomic Force Microscopy ◽  
Cell Surface ◽  
Reconstruction Method ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals A Simple Approach for the Synthesis of Gold Nanoparticles Mediated by Layered Double Hydroxide

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Aires da Conceição Silva ◽  
Andréa Luzia Ferreira de Souza ◽  
Renata Antoun Simão ◽  
Luiz Fernando Brum Malta
Keyword(s):  
Gold Nanoparticles ◽  
Atomic Force Microscopy ◽  
Layered Double Hydroxide ◽  
Xrd Analysis ◽  
Reducing Agents ◽  
Simple Approach ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Analysis ◽  
Double Hydroxide

The present work introduces a new procedure to obtain gold nanoparticles (AuNPs). AuNPs (77–213 nm) were obtained in the absence of any classical reducing agents in a medium containing Mg2+/Al3+layered double hydroxide (LDH) andN,N-dimethylformamide. XRD analysis showed the presence of crystalline phases of gold in the Au/LDH composite. The 2θvalues of peaks corresponding to the LDH interlayer distance indicated that metallic NPs were deposited on the surface of the material. Furthermore, atomic force microscopy (AFM) analysis showed that AuNPs tend to agglomerate in a nonclassical halter-like shape.

Synthesis of Complex Perovskite Oxides via Nanosheets Process

2007 ◽  
Vol 350 ◽  
pp. 55-58
Author(s):  
Keigo Inaba ◽  
Shinya Suzuki ◽  
Yuji Noguchi ◽  
Masaru Miyayama ◽  
Minoru Osada
Keyword(s):  
Heat Treatment ◽  
Atomic Force Microscopy ◽  
Solid State ◽  
Dielectric Permittivity ◽  
Perovskite Oxides ◽  
Cation Ordering ◽  
Complex Perovskite ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scattering Measurement

Complex perovskite oxides of Sr0.5(Nb0.5Ta0.5)O3 were synthesized by reassembling (SrNb2O7)2− and (Sr1.5Ta3O10)2− nanosheets followed by topochemical dehydration with heat treatment. Atomic force microscopy (AFM) images showed that the thicknesses of the (SrNb2O7)2− and (Sr1.5Ta3O10)2− nanosheets were approximately 6 nm (7 unit layers) and 4 nm (3 unit layers), respectively. Raman scattering measurement has suggested that nanosheet-processed Sr0.5(Nb0.5Ta0.5)O3 with B-site-cation ordering has a superlattice-like structure composed of alternating layers of Sr0.5NbO3 and Sr0.5TaO3 along the c-axis. Nanosheet-processed Sr0.5(Nb0.5Ta0.5)O3 with B-site-cation ordering exhibited a dielectric permittivity of 42 (1 MHz), which was lower than that of solid-state-reacted samples (65) with disordered B-site cations.

scholarly journals Atomic Force Microscopy Nanomanipulation of Shape Persistent, Spherical, Self-Assembled Aggregates of Gold Nanoparticles

ACS Nano ◽  
2010 ◽  
Vol 4 (11) ◽  
pp. 6501-6508 ◽  
Author(s):  
Jeroen van Herrikhuyzen ◽  
Ron Willems ◽  
Subi J. George ◽  
Cees Flipse ◽  
Jeroen C. Gielen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Self Assembled

Heat Treatment Processes of A2024 Rheoforging Alloy and Morphology Investigation by Nanoindentation and Atomic Force Microscopy

2008 ◽  
Vol 141-143 ◽  
pp. 385-390 ◽  
Author(s):  
D.S. Kim ◽  
C.G. Kang ◽  
S.M. Lee
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Atomic Force Microscopy ◽  
Aluminum Alloy ◽  
Phase Region ◽  
Force Microscopy ◽  
T6 Heat Treatment ◽  
Treatment Processes ◽  
Atomic Force ◽  
Wrought Aluminum

This study demonstrated nanoindentation techniques of investigating the effects of size and feature in a microstructure on the mechanical properties of rheology-forged aluminum alloy. Mechanical properties and tribological characteristics of rheology-forged Al2024 wrought aluminum alloy in terms of T6 heat treatment were investigated by varying the aging time by nanoindentation and nanoscratch techniques. By nanoindentation/nanoscratch tests and atomic force microscopy, it was demonstrated that the 4 hour aged material exhibites the highest hardness because of the intermediate precipitate phase θ″, which was precipitated by T6 heat treatment at 495°C. Moreover, the friction coefficients in the precipitates in the eutectic phase region were lower than those in the primary α phase region.

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