scholarly journals Nanosize Metal Alloy Particle Formation in AG and CU Sequentially Implanted Silica

1993 ◽  
Vol 316 ◽  
Author(s):  
R. A. Zuhr ◽  
R. H. Magruder ◽  
A. Anderson ◽  
J. E. Wittig
Keyword(s):  
Metal Ions ◽  
Optical Spectroscopy ◽  
High Purity ◽  
Relative Concentration ◽  
Optical Response ◽  
Particle Formation ◽  
Alloy Particle ◽  
Metal Colloids ◽  
Composition Changes ◽  
Cu Ions

Abstract:A series of high purity silica samples were sequentially implanted with Ag and Cu ions at energies such that the depth distributions for each of the ions overlapped. The samples were characterized by RBS, TEM and optical spectroscopy. The optical response was found to be dependent on the order of sequential implantation, as well as the relative concentration of the implanted elements. The changes in the optical response are attributed to composition changes of the metal colloids that are formed as a result of alloying of the sequentially implanted metal ions, as well as to changes in the size the colloids.

scholarly journals An Investigation on Design and Characterization of a Highly Selective LED Optical Sensor for Copper Ions in Aqueous Solutions

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1099
Author(s):  
Sheng-Chun Hung ◽  
Chih-Cheng Lu ◽  
Yu-Ting Wu
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Copper Ions ◽  
Incident Light ◽  
Copper Ion ◽  
Intensity Change ◽  
Optical Absorbance ◽  
Sensing System ◽  
Optic Sensor ◽  
Cu Ions

The optical characteristics of copper ion detection, such as the photometric absorbance of specific wavelengths, exhibit significant intensity change upon incident light into the aqueous solutions with different concentrations of metal ions due to the electron transition in the orbit. In this study, we developed a low-cost, small-size and fast-response photoelectric sensing prototype as an optic sensor for copper (Cu) ions detection by utilizing the principle of optical absorption. We quantified the change of optical absorbance from infra-red (IR) light emitting diodes (LEDs) upon different concentrations of copper ions and the transmitted optical signals were transferred to the corresponding output voltage through a phototransistor and circuit integrated in the photoelectric sensing system. The optic sensor for copper (Cu) ions demonstrated not only excellent specificity with other metal ions such as cadmium (Cd), nickel (Ni), iron (Fe) and chloride (Cl) ions in the same aqueous solution but also satisfactory linearity and reproducibility. The sensitivity of the preliminary sensing system for copper ions was 29 mV/ppm from 0 to 1000 ppm. In addition, significant ion-selective characteristics and anti-interference capability were also observed in the experiments by the proposed approach.

Versatile optical response of pyridylalkyl naphthalenediimides in the interaction with metal ions

2021 ◽  
Vol 1236 ◽  
pp. 130277
Author(s):  
Christian L. Castro-Riquelme ◽  
Adrián Ochoa-Terán ◽  
Itzel Yareli Roldán-Villegas ◽  
Balter Trujillo-Navarrete ◽  
Valentín Miranda-Soto ◽  
...  
Keyword(s):  
Metal Ions ◽  
Optical Response

Characterization on the Microstructures and Optical Performances of TiO2 Doped with Transition Metals

2014 ◽  
Vol 887-888 ◽  
pp. 388-394 ◽  
Author(s):  
Xin Hua Liu ◽  
Yi Deng ◽  
Yu Chuan Zhang ◽  
Yin Hang Zhou
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Transition Metal Ions ◽  
Ultraviolet Region ◽  
Visible Light Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Light Region ◽  
Cu Ions

The structures and optical performances of TiO2doped with 4thperiodic transition metal ions were investigated in this paper. The characterization results of X-ray photoelectron spectroscopy and X-ray diffraction showed that the transition metal ions existed in oxidative states, and composites formed because of the reaction between doped metal ions and TiO2. The absorption spectroscopy of TiO2doped with zinc was mainly in ultraviolet region, close to that of the pure TiO2. While for TiO2doped with other transition metal ions including V, Cr, Mn, Fe, Co, Ni and Cu ions, the absorption spectroscopies covered ultraviolet region and visible light region, much broader than that of the pure TiO2.

Identification of residual donors in high-purity epitaxial GaAs with the use of magneto-optical spectroscopy

1983 ◽  
Vol 28 (6) ◽  
pp. 3300-3305 ◽  
Author(s):  
D. C. Reynolds ◽  
K. K. Bajaj ◽  
C. W. Litton ◽  
E. B. Smith
Keyword(s):  
Optical Spectroscopy ◽  
High Purity ◽  
Epitaxial Gaas

Influence of calcium and EDTA on copper ion bioavailability in copper nanoparticle toxicity tests improves understanding of nano-specific effects

2020 ◽  
Vol 36 (7) ◽  
pp. 467-476
Author(s):  
Halis Boran
Keyword(s):  
Acute Toxicity ◽  
Metal Ions ◽  
Ethylenediaminetetraacetic Acid ◽  
Scale Effects ◽  
Copper Ion ◽  
Chelating Agent ◽  
Aquatic Organisms ◽  
Toxicity Tests ◽  
Cu Toxicity ◽  
Cu Ions

Metal-based nanoparticles (NPs) can release metal ions that are toxic to aquatic organisms; however, whether the toxicity is from metal ions rather than unique “nano-scale” effects of the NPs is unresolved. The present study aimed to compare the toxicity of Cu2+ and Cu-NPs in larval zebrafish ( Danio rerio) to clarify whether toxic effects are attributable to release of Cu ions and to determine the effect of the chelating agent ethylenediaminetetraacetic acid (EDTA) and calcium hardness (as CaCO3) on the Cu toxicity. First, the acute toxicity (96-h lethality) of Cu-NPs was determined in comparison to aqueous Cu in larvae exposed to CuSO4, and subsequently, sublethal tests with Cu-NPs and CuSO4 were conducted with additions of EDTA or calcium ions to evaluate alterations in expression of metallothionein-2 ( MT2) gene transcripts (quantitative real-time polymerase chain reaction). Acute toxicity of Cu in larvae exposed to CuSO4 was greater (LC50 = 226 µg Cu/L) than for larvae exposed to Cu-NPs (LC50 = 648 µg Cu/L). The expression of MT2 increased with Cu concentration ( p < 0.05), and the slope of the linear regression was significantly greater in fish exposed to CuSO4 (slope = 0.090) compared to Cu-NPs (slope = 0.011). Cu2+ was 2.9-fold more toxic than Cu-NPs. The presence of 5 mg/L EDTA and 220 mg/L CaCO3 significantly reduced the expression of MT2 (1.8-fold for EDTA, 2.3-fold for CaCO3) in larvae exposed to CuSO4. For larvae exposed to Cu-NPs, the presence of EDTA reduced the expression of MT2 (1.7-fold) relative to Cu-NP concentration. While Cu-NPs induced MT2 expression, the differences in concentration relationships of MT2 expression between Cu-NPs and CuSO4 indicated that factors other than release of Cu ions from Cu-NPs influenced acute toxicity of Cu-NPs. The conclusion drawn from this ecotoxicological risk assessment was that EDTA and calcium significantly decreased Cu toxicity in freshwater fish.

scholarly journals 2D-IR spectroscopy for oil paint conservation: Elucidating the water-sensitive structure of zinc carboxylate clusters in ionomers

2019 ◽  
Vol 5 (6) ◽  
pp. eaaw3592 ◽  
Author(s):  
Joen. J. Hermans ◽  
Lambert Baij ◽  
Mark Koenis ◽  
Katrien Keune ◽  
Piet D. Iedema ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Metal Ions ◽  
Relative Concentration ◽  
Cluster Structure ◽  
Polymer Structure ◽  
Polymer Materials ◽  
White Pigment ◽  
Metal Soap ◽  
2D Ir ◽  
Degradation Reactions

The molecular structure around metal ions in polymer materials has puzzled researchers for decades. This question has acquired new relevance with the discovery that aged oil paint binders can adopt an ionomer structure when metal ions leached from pigments bind to carboxylate groups on the polymerized oil network. The characteristics of the metal-polymer structure are expected to have important consequences for the rate of oil paint degradation reactions such as metal soap formation and oil hydrolysis. Here, we use two-dimensional infrared (2D-IR) spectroscopy to demonstrate that zinc carboxylates formed in paint films containing zinc white pigment adopt either a coordination chain– or an oxo-type cluster structure. Moreover, it was found that the presence of water governs the relative concentration of these two types of zinc carboxylate coordination. The results pave the way for a molecular approach to paintings conservation and the application of 2D-IR spectroscopy to the study of polymer structure.

The interaction of photoexcited carbon nanodots with metal ions disclosed down to the femtosecond scale

Nanoscale ◽  
2017 ◽  
Vol 9 (33) ◽  
pp. 11902-11911 ◽  
Author(s):  
A. Sciortino ◽  
A. Madonia ◽  
M. Gazzetto ◽  
L. Sciortino ◽  
E. J. Rohwer ◽  
...  
Keyword(s):  
Steady State ◽  
Transition Metal ◽  
Metal Ions ◽  
Optical Spectroscopy ◽  
Transition Metal Ions ◽  
Carbon Nanodots ◽  
Fluorescent Carbon Nanodots ◽  
Fluorescent Carbon

We use a combination of steady state, nanosecond-resolved, and femtosecond-resolved optical spectroscopy to fully unravel the interactions of highly fluorescent carbon nanodots with transition metal ions.

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