scholarly journals Study of the Effects of MeV Ag, Cu, Au and Sn Implantation on the Optical Properties of LiNbO3

1997 ◽  
Vol 504 ◽  
Author(s):  
E. K. Williams ◽  
D. Ila ◽  
S. Sarkisov ◽  
M. Curley ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Room Temperature ◽  
Linear Absorption ◽  
Tem Analysis ◽  
Au Clusters ◽  
Optical Absorption Peak ◽  
Nonlinear Index ◽  
Ag Clusters

ABSTRACTWe present the results of characterization of linear absorption and nonlinear refractive index of Au, Ag, Cu and Sn ion implantation into LiNbO3. Silver was implanted at 1.5 MeV to fluences of 2 to 17 × 1016/cm2 at room temperature. Gold and copper were implanted to fluences of 5 to 20 × 1016/cm2 at an energy of 2.0 MeV. Tin was implanted to a fluence of 1.6 × 1017/cm2 at 160 kV. After heat treatment at 1000°C a strong optical absorption peak for the Au implanted samples appeared at ∼620 nm. The absorption peaks of the Ag implanted samples shifted from ∼450 nm before heat treatment to 550 nm after 500°C for lh. Heat treatment at 800°C returned the Ag implanted crystals to a clear state. Cu nanocluster absorption peaks disappears at 500°C. No Sn clusters were observed by optical absorption or XRD. The size of the Ag and Au clusters as a function of heat treatment were determined from the absorption peaks. The Ag clusters did not appreciably change in size with heat treatment. The Au clusters increased from 3 to 9 nm in diameter upon heat treatment at 1000°C. TEM analysis performed on a Au implanted crystal indicated the formation of Au nanocrystals with facets normal to the c-axis. Measurements of the nonlinear refractive indices made using the Z-scan method showed that Ag implantation changed the sign of the nonlinear index of LiNbO3 from negative to positive.

The characterization of pure and niobium-doped crystals of strontium titanate using Hall, electrical conductivity, and optical absorption data

1978 ◽  
Vol 56 (4) ◽  
pp. 453-467 ◽  
Author(s):  
G. Perluzzo ◽  
J. Destry
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Optical Absorption ◽  
Hall Effect ◽  
Strontium Titanate ◽  
Defect States ◽  
Absorption Data ◽  
Niobium Doped ◽  
Hall Effect Measurements

A description is given of the heat treatment, under controlled conditions, of crystals of strontium titanate, both pure and niobium-doped, and of the effect of this treatment on the defect states in this material. Our analysis is based on evaluation of the results of electrical conductivity and Hall effect measurements, and those of optical absorption.

Synthesis and Characterization of In2O3 Nanobelts via Hydrothermal Route

2015 ◽  
Vol 1118 ◽  
pp. 43-46
Author(s):  
Guo Dong Liu ◽  
Yu Guang Wang ◽  
Hui Bing Lu ◽  
Yuan Tian
Keyword(s):  
Heat Treatment ◽  
Single Crystals ◽  
Hydrothermal System ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Hydrothermal Route ◽  
Pl Spectra

In the hydrothermal system, In (OH)3nanobelts were obtained. After heat-treatment at 300 °C, In2O3single crystals nanobelts were produced, which can keep the morphologies and sizes of precursors. The room temperature PL spectra of as-prepared In2O3nanobelts are also detected. PL peaks of In2O3nanobelts mainly focused at 458 nm (blue).

Epitaxy of Aluminium Films on Semiconductors by Ionized Cluster Beam

1984 ◽  
Vol 37 ◽  
Author(s):  
I. Yamada ◽  
C. J. Palmstrøm ◽  
E. Kennedy ◽  
J. W. Mayer ◽  
H. Inokawa ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Depth Profiling ◽  
Electrical Characterization ◽  
Life Time ◽  
Cluster Beam ◽  
Clean Surface ◽  
Si Substrate ◽  
Thermal Stability Of

AbstractEpitaxial Al films have been deposited onto the clean surface of single-crystal Si by ionized cluster beam (ICB) at room temperature. Thermal stability of the film has been examined by SEM, AES depth profiling, ion backscat. tering/channeling, and electrical characterization of the Al-Si interface. It was found that the ICB Al film on Si substrate was remarkably stable up to 550°C although pure Al was used. Alloy penetration at the interface, shift of barrier height, degradation of crystalline quality and development of annealing hillocks on the surface were not observed after the heat treatment. Extremely long electromigration life time was also confirmed. Epitaxial growth on GaAs(100) substrate was attempted and preliminary results are given.

X-Ray Absorption Spectroscopy and Optical Absorption Studies of the Growth of CdS Nanocrystals in Glass

1994 ◽  
Vol 358 ◽  
Author(s):  
P. D. Persans ◽  
L. B. Lurio ◽  
J. Pant ◽  
R. J. Olsson ◽  
H. Yukselici ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Nearest Neighbor ◽  
Nearest Neighbors ◽  
Cds Nanoparticles ◽  
X Ray ◽  
Cds Nanocrystals ◽  
Optical Absorption Peak ◽  
Absorption Studies ◽  
X Ray Absorption

ABSTRACTWe have measured and analyzed optical absorption, Raman scattering and x-ray absorption spectra of CdS nanocrystals grown by solid-state reaction in a borosilicate glass. We observe the appearance and growth of an optical absorption peak which is attributed to CdS nanoparticles. Using x-ray absorption we quantify the progressive replacement of O nearest neighbors of Cd by S with heat treatment and the appearance and growth of a well-defined second nearest neighbor peak.

IN-SITU Analysis Of The Microstructure of Thermally Treated Thin Copper Films

1993 ◽  
Vol 309 ◽  
Author(s):  
J. Nucci ◽  
H. Neves ◽  
Y. Shacham ◽  
E. Eisenbraun ◽  
B. Zheng ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Room Temperature ◽  
Thermal Evolution ◽  
Electron Beam Evaporation ◽  
Copper Films ◽  
Tem Analysis ◽  
Heat Treated ◽  
Baseline Information

AbstractCopper thin films were deposited by sputtering, electron beam evaporation, and electroless plating onto nitride membranes for TEM analysis. The samples were heat treated in-situ from room temperature to 600 °C for structural and chemical analysis. The as-deposited and heat treated microstructures were investigated. Orientation changes with heat treatment and reactions among the sample layers were analyzed by electron diffraction. This work provides baseline information for a study of the thermal evolution of copper lines.

Growth of Au Nanoparticles Stimulate Spectroscopic Properties of Er3+ Doped TeO2-ZnO-Na2O Glasses

2014 ◽  
Vol 895 ◽  
pp. 254-259 ◽  
Author(s):  
Asmahani Awang ◽  
Sib Krishna Ghoshal ◽  
M.R. Sahar ◽  
M. Reza Dousti ◽  
Fakhra Nawaz
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Room Temperature ◽  
Au Nanoparticles ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Spectroscopic Properties ◽  
Au Nps ◽  
Amorphous Nature ◽  
Gold Nps

The changes in optical properties of 70TeO2-20ZnO-10Na2O-0.5Er2O3-0.2Au glass system are stimulated by varying the heat treatment duration. The XRD data reveals broad humps in range of 25-35 degree representing the amorphous nature of the glass materials. The optical absorption edge at room temperature is used to estimate the direct (Edir), indirect (Eindir) optical band gap and the Urbach energy (EU). The value of Edirlies between 2.937 to 2.943 eV, while the value of Eindirlies within 2.478 to 2.502 eV. The value of EUis found to increase with longer time of heat treatment and lies between 0.409 to 0.424 eV. The characteristic surface plasmon resonance (SPR) band of Au nanoparticles (NPs) was observed at ~630 nm of optical absorption spectra. The strong and medium green upconversion (UC) fluorescence from Er3+centred at 547 and 533 nm were observed at room temperature, in addition to a weak red UC fluorescence from Er3+centred at 637 nm. The SPR stimulated by the presence of Au NPs enhanced the luminescence intensity by four and five folds for 1 and 4 hours heat treatment, respectively. The results indicate that there is a large influence of growth of gold NPs on the optical and spectroscopic properties of glass samples. Our results may be useful for the fabrication of nanophotonic materials.

Nanoemulsion Synthesis of Magnetic-Optical CoNiAu Nanoparticles

2014 ◽  
Vol 904 ◽  
pp. 90-94
Author(s):  
Hong Qin Shao ◽  
Zheng Guan ◽  
Jun Hua Wu ◽  
Hong Ling Liu
Keyword(s):  
Magnetic Properties ◽  
Biomedical Applications ◽  
Room Temperature ◽  
Vibrating Sample Magnetometry ◽  
Tem Analysis ◽  
X Ray ◽  
Near Ir ◽  
Transmission Electron ◽  
Optical And Magnetic Properties

Multi-functional CoNiAu nanoparticles were successfully synthesized via nanoemulsion method with the use of PEO-PPO-PEO as the surfactant, C14H29CH(OH)CH2OH as the reducing agent, Ni (acac)2, Co (acac)2 and Au (ac)3 as precursors. The characterization of the CoNiAu nanoparticles was performed using X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM) and UV-vis near IR spectrophotometer (UV-vis). The XRD and TEM analysis confirm the formation and structure of the nanoparticles. The UV-vis and VSM measurements display the optical and magnetic properties of the CoNiAu nanoparticles at the room temperature. The CoNiAu nanoparticles with the well defined optical and magnetic properties are promised for optical, magnetic, catalytic and biomedical applications.

Chemical synthesis and characterization of MnO2-coated Co nanoparticles

2010 ◽  
Vol 25 (9) ◽  
pp. 1748-1754
Author(s):  
Jing An ◽  
Jun He ◽  
Dongliang Zhao ◽  
Zhongyuan Liu
Keyword(s):  
Exchange Bias ◽  
Chemical Process ◽  
Room Temperature ◽  
Decomposition Reaction ◽  
Tem Analysis ◽  
The Core ◽  
Transmission Electron ◽  
Acid Environment ◽  
Co Nanoparticles

Co/MnO2 particles are synthesized by a simple two-step chemical process. It includes the reduction of Co2+ cations to Co nanoparticles with sodium borohydride (NaBH4) in aqueous solution, followed by coating the sample with a surface layer of MnO2. The coating is accomplished using a simple decomposition reaction, in aqueous KMnO4 solution with acid environment at room temperature. Transmission electron microscopy (TEM) analysis demonstrates that the core of the particles is composed of Co clusters that have a narrow size distribution. The strong interface effect of the Co/MnO2 particles is also studied by the detection of exchange bias phenomena of hysteresis curves.

Synthesis and Characterization of Monodispersed Rare-earth Ion Doped CeO2 Coated on SiO2 Spheres

2008 ◽  
Vol 1074 ◽  
Author(s):  
Pandurangan Muralidharan ◽  
Seung Hwan Jo ◽  
Hyun Wook Lee ◽  
Do Kyung Kim
Keyword(s):  
Heat Treatment ◽  
Rare Earth ◽  
Sol Gel ◽  
Rare Earth Ion ◽  
Uniform Size ◽  
Tem Analysis ◽  
Xrd Patterns ◽  
Photoluminescence Studies ◽  
Sio2 Spheres

ABSTRACTCore–shell microspheres of monodispersed SiO2 coated with rare-earth ion doped CeO2 (Eu3+ Sm3+ Dy3+) were prepared through a sol-gel method and followed by heat treatment at 800 °C for 4 h. XRD patterns revealed the crystal structures of the doped CeO2 coated on amorphous SiO2 sphere as a shell subsequent to heat treatment at 800 °C. SEM and TEM analysis indicated the microstructures of the coating and uniform size distributions of microspheres. Photoluminescence studies showed that the luminescent property had significant influence depending on different dopant ions and the thickness of the shell coated on SiO2 spheres.

Characterization of Laser Induced Backside Damage for Gettering Purposes

1981 ◽  
Vol 4 ◽  
Author(s):  
G.E.J. Eggermont ◽  
D.F. Allison ◽  
S.A. Gee ◽  
K.N. Ritz ◽  
R.J. Falster ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Side Effects ◽  
Laser Pulse ◽  
Laser Pulse Energy ◽  
Limited Range ◽  
The Other ◽  
Tem Analysis ◽  
Initial Oxidation

ABSTRACTA characterization of Q-switched Nd-YAG laser induced backside damage in various stages of a bipolar process is presented. TEM-analysis shows the occurence of microcracks, low angle boundaries and dislocations in as-irradiated wafers, of which the microcracks anneal out during an initial oxidation at 1050°C. The other damage is very stable and remains even after a heat treatment at 1200°C. This is quite in contrast with mechanically or Ar implantation induced backside damage, which anneal out completely at such high temperatures. Side effects of laser induced backside damage such as surface roughness and influence on wafer strength are found to be of no consequence within a limited range of laser pulse energy densities where the gettering efficiency is found to be very promising.

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