scholarly journals Clustering in thin silver films upon heating

2021 ◽  
Vol 2103 (1) ◽  
pp. 012109
Author(s):  
V A Kazakov ◽  
A G Razina ◽  
A V Smirnov ◽  
A I Vasilev
Keyword(s):  
Composite Structures ◽  
Silver Clusters ◽  
Continuous Film ◽  
Silver Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Visible Wavelength Range ◽  
Individual Nanoparticles ◽  
Optical Spectrophotometry ◽  
Kinetics Of

Abstract The kinetics of the formation of silver clusters Ag from nanoscale continuous films of Ag on the surface of silicate glass and composite structures from films of Ag with carbon in the form of a continuous film and individual nanoparticles upon annealing in air at temperatures up to 670K is investigated. In the course of the work, the dependences of the surface morphology of silver clusters and absorption spectra in the visible wavelength range were obtained by the methods of atomic force microscopy and optical spectrophotometry.

Optical Properties of Sputtered Silver Granular Films

2005 ◽  
Vol 480-481 ◽  
pp. 287-292 ◽  
Author(s):  
S.E. Paje ◽  
F. Teran ◽  
J.M. Riveiro ◽  
J. Llopis ◽  
M.A. García ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Optical Absorption ◽  
Surface Morphology ◽  
Silver Clusters ◽  
Plasmon Excitation ◽  
Granular Films ◽  
Silver Films ◽  
Atomic Force ◽  
Atomic Force Micrographs

In this research we study optical absorption and morphology of silver films prepared with a sputtering method. Silver granular films are obtained on a glass substrate for films with thickness smaller than about 60 Å. Superficial silver clusters of around 100 nm in diameter are clearly seen in the atomic force micrographs. The absorption of these samples are characterized by plasmon excitation in the 450-650 nm spectral range, which differs from the known excitation of silver nanoparticles fabricated by different techniques. The optical absorption of silver granular films depend on sputtering conditions like substrate temperature or deposition rate and correlates with the surface morphology.

Morphology of Silver Thin Films Deposited on TiO2(110) Surfaces

1998 ◽  
Vol 05 (01) ◽  
pp. 387-392 ◽  
Author(s):  
D. Abriou ◽  
D. Gagnot ◽  
J. Jupille ◽  
F. Creuzet
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Two Dimensional ◽  
Silver Films ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Silver Deposits ◽  
Silver Thin Films

The growth mode of silver films deposited at room temperature on TiO 2(110) surfaces has been examined by means of atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) in ultrahigh vacuum (UHV) conditions, On clean vacancy-free TiO 2(110) surfaces, 0.1-nm-thick (on average) Ag deposits form a two-dimensional (2D) layer. When the thickness of the silver overlayer is increased, 3D clusters are shown to appear while the 2D film is preserved, furthermore, the influence of surface oxygen vacancies on the growth of Ag/TiO 2(110) is evidenced by well-characterized differences in the morphology of 9-nm-thick silver deposits.

SURFACE PLASMON ENHANCED OPTICAL SECOND HARMONIC GENERATION IN ULTRA-THIN METALLIC FILMS

1999 ◽  
Vol 08 (04) ◽  
pp. 503-518 ◽  
Author(s):  
JUH-TZENG LUE ◽  
CHIA-SHY CHANG
Keyword(s):  
Second Harmonic ◽  
Angular Position ◽  
Field Enhancement ◽  
Surface Scattering ◽  
Metallic Films ◽  
Silver Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Peak Intensity ◽  
20 Nm

Internal reflection of second-harmonic generations from silver films with thickness ranging from 5 nm to 50 nm are enhanced by the excitation of surface plasmons under Kretschmann configuration. Enhancement of the SHG was observed at a film thickness of 20 nm resulting from the field enhancement of granular structure. For thinner films, the surface reveals disconnected islands as inspected by the atomic force microscopy. The incident angular position to find the peak intensity and the change of linewidth of the SHG can almost satisfactorily be predicted by the theory based on surface scattering.

Kinetics of the Nanohydrogel Flattening at a Hydrophobic Interface

2008 ◽  
Vol 8 (7) ◽  
pp. 3386-3391
Author(s):  
ImShik Lee ◽  
Haiying Sun ◽  
Jingxia Song ◽  
Ying Zhang
Keyword(s):  
Adsorption Mechanism ◽  
Pyrolytic Graphite ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dynamic Observation ◽  
Membrane Mimetic ◽  
Aqueous Conditions ◽  
Unfolding Kinetics ◽  
Kinetics Of ◽  
Hydrophobic Interface

Hydrophobitized polysaccharides were designed to form the self-assembled nanohydrogels (hydrogel nanoparticles) in the aqueous conditions. For improving their biocompatibilities, they were decorated with the biomembrane-mimetic 2-methacryloyloxyethy1 phosphory1choline (MPC) polymers. The interfacial roles of the decorated membrane-mimetic nanohydrogels were investigated by choosing MPC branched choresteryl-bearing pullulan (CHP). Tapping-mode atomic force microscopy was used to study its adsorption mechanism on the hydrophobic highly oriented pyrolytic graphite (HOPG) surface in aqueous conditions. Dynamic observation at the interfaces revealed two distinctive patterns: the immobilized nanohydrogel particles and the flatten layers. The flattening (unfolding) kinetics with and without MPC branched nanohydrogel revealed that the flattening energy was at ∼37 kBT. The flattening rate of the MPC decorated nanohydrogels was ∼1.7 times faster than that without MPC decoration, corresponding to minor reduction of the flattening activation energy.

Kinetics of Linear Defect Formation in Gallia-Doped Rutile.

2004 ◽  
Vol 849 ◽  
Author(s):  
Nathan Empie ◽  
Doreen Edwards
Keyword(s):  
Single Crystal ◽  
Defect Formation ◽  
Sol Gel ◽  
Surface Concentration ◽  
Thermal Treatments ◽  
Rutile Structure ◽  
Force Microscopy ◽  
Linear Defects ◽  
Atomic Force ◽  
Kinetics Of

ABSTRACTThe diffusion of Ga2O3 into the surface of single crystal[001] rutile leads to the insertion of β-gallia subunits along {210} planes of the parent rutile structure. These linear defects introduce hexagonally shaped tunnels, approximately 2.5 å in diameter, normal to the]001] surface. Because these tunnels may serve as highly reactive sites for the attachment of macromolecules, we are exploring the application of these linear defects for creating nanostructures. The current work investigates the kinetics of defect formation and the factors that affect defect periodicity and orientation. Gallium oxide was applied to the surfaces of [001]-oriented TiO2 single-crystal substrates via a sol-gel spin-coating process using a gallium-containing precursor. Thermal treatments were systematically varied to obtain different defect surface structures. Defect orientation and the surface concentration of rows of defects were characterized via tapping mode atomic force microscopy.

scholarly journals Growth and Switching of Ferroelectric Nanocrystals from Ultrathin Film of Copolymer of Vinylidene Fluoride and Trifluoroethylene

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
R. Gaynutdinov ◽  
V. Fridkin ◽  
H. Kliem
Keyword(s):  
Self Assembly ◽  
Vinylidene Fluoride ◽  
Paraelectric Phase ◽  
Orthorhombic Space Group ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Storage Media ◽  
Atomic Force ◽  
Kinetics Of

The ferroelectric nanocrystals of the copolymer of vinylidene fluoride and trifluoroethylene P(VDF-TrFE) were grown from ultrathin Langmuir-Blodgett (LB) films on Si substrate. The annealing of ultrathin LB films with thickness of 3 monolayers (5 nm) in air in paraelectric phase at temperature 125∘C was performed. The self-assembly leads to the growth of nanocrystals of ferroelectric copolymer 15–25 nm thick and 100–200 nm in diameter. The nanocrystals presumably belong to orthorhombic space group, where axis 2 is the direction of spontaneous polarization (and normal to substrate). By means of atomic force microscopy (AFM), the kinetics of ferroelectric nanocrystals growth and their switching were investigated. The obtained results confirm the conclusions that copolymer nanocrystals are candidates for high-density nonvolatile storage media devices.

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