scholarly journals Dendritic Forest-Like Ag Nanostructures Prepared Using Fluoride-Assisted Galvanic Replacement Reaction for SERS Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1359
Author(s):  
Ming-Hua Shiao ◽  
Tsunghsueh Wu ◽  
Hung Ji Huang ◽  
Ching-Yi Peng ◽  
Yung-Sheng Lin ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Limit Of Detection ◽  
Optical Emission ◽  
Galvanic Replacement ◽  
Galvanic Replacement Reaction ◽  
Replacement Reaction ◽  
Electromagnetic Excitation ◽  
X Ray ◽  
Inductively Coupled ◽  
Surface Enhanced Raman

Dendritic forest-like Ag nanostructures were deposited on a silicon wafer through fluoride-assisted galvanic replacement reaction (FAGRR) in aqueous AgNO3 and buffered oxide etchant. The prepared nanostructures were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, inductively coupled plasma–optical emission spectroscopy, a surface profiler (alpha step), and X-ray diffraction. Additionally, the dendritic forest-like Ag nanostructures were characterized using surface-enhanced Raman scattering (SERS) when a 4-mercaptobenzoic acid (4-MBA) monolayer was adsorbed on the Ag surface. The Ag nanostructures exhibited intense SERS signal from 4-MBA because of their rough surface, and this intense signal led to an intense local electromagnetic field upon electromagnetic excitation. The enhancement factor for 4-MBA molecules adsorbed on the Ag nanostructures was calculated to be 9.18 × 108. Furthermore, common Raman reporters such as rhodamine 6G, 4-aminothiolphenol, 5,5′-dithiobis-2-nitrobenzoic acid, and carboxyfluorescein (FAM) were characterized on these dendritic forest-like Ag nanostructures, leading to the development of an ultrasensitive SERS-based DNA sensor with a limit of detection of 33.5 nM of 15-mer oligonucleotide.

scholarly journals Using SEM-EDX and ICP-OES to Investigate the Elemental Composition of Green MacroalgaVaucheria sessilis

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Izabela Michalak ◽  
Krzysztof Marycz ◽  
Katarzyna Basińska ◽  
Katarzyna Chojnacka
Keyword(s):  
Elemental Composition ◽  
Cross Section ◽  
Inductively Coupled Plasma ◽  
Algal Biomass ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Icp Oes ◽  
X Ray ◽  
Inductively Coupled ◽  
Analytical System

The biomass ofVaucheria sessilisforms algal mats in many freshwaters. There is a need to find the method of algal biomass utilization.Vaucheria sessilisis a rich source of micro- and macronutrients and can be used as a soil amendment. In the paper, the elemental composition of enriched, via bioaccumulation process, macroalga was investigated. For this purpose, two independent techniques were used: scanning electron microscopy with an energy dispersive X-ray analytical system (SEMEDX) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The biomass was exposed to two microelemental solutions, with Cu(II) and Zn(II) ions. After two weeks of the experiment, macroalga accumulated 98.5 mg of Zn(II) ions in 1 g of dry biomass and 68.9 mg g−1of Cu(II) ions. Micrographs performed by SEM proved that bioaccumulation occurred. Metal ions were bound on the surface and in the interior of cells. Mappings of all cations showed that in the case of the surface of biomass (biosorption), the elements constituted aggregations and in the case of the cross section (bioaccumulation) they were evenly distributed. The algal biomass with permanently bound microelements can find an application in many branches of the industry (feed, natural fertilizers, etc.).

Improving the analytical performance of electrothermal vaporization coupled to inductively coupled plasma optical emission spectrometry using a mixed-gas plasma

2019 ◽  
Vol 34 (5) ◽  
pp. 891-898 ◽  
Author(s):  
Guilherme Luiz Scheffler ◽  
Dirce Pozebon ◽  
Diane Beauchemin
Keyword(s):  
Inductively Coupled Plasma ◽  
Limit Of Detection ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Solid Sampling ◽  
Electrothermal Vaporization ◽  
Mixed Gas ◽  
Inductively Coupled ◽  
Gas Plasma ◽  
Plasma Optical Emission Spectrometry

Adding nitrogen to the plasma gas in ICPOES significantly improves sensitivity and limit of detection for solid sampling ETV.

Inductively Coupled Plasma Optical Emission Spectroscopy Determination of Trace Element Composition of Argan Oil

2010 ◽  
Vol 16 (1) ◽  
pp. 65-71 ◽  
Author(s):  
A. Gonzálvez ◽  
M.E. Ghanjaoui ◽  
M. El Rhazi ◽  
M. de la Guardia
Keyword(s):  
Trace Element ◽  
Inductively Coupled Plasma ◽  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Limit Of Detection ◽  
Optical Emission ◽  
Inductively Coupled ◽  
Argan Oil ◽  
Plasma Optical Emission Spectroscopy

A methodology based on inductively coupled plasma optical emission spectroscopy (ICP-OES) after microwave assisted acid digestion has been developed to determine the trace element content of Moroccan argan oil. Limit of detection values equal or lower than few mg/kg were obtained for all elements under study. To assure the accuracy of the whole procedure, recovery studies were carried out on argan oil samples spiked at different concentration levels from 10 to 200 µg/L. Quantitative average recovery values were obtained for all elements evaluated, demonstrating the suitability of this methodology for the determination of trace elements in argan oil samples. Aluminum, calcium, chromium, iron, potassium, lithium, magnesium, sodium, vanadium and zinc were quantitatively determined in Moroccan argan oils being found that their concentration is different of that found in other edible oils thus offering a way for authentication and for the evaluation of possible adulterations.

GROWTH AND SPECTROSCOPIC CHARACTERIZATION OF Mg:Ce:Cu:LiNbO3 CRYSTALS

2008 ◽  
Vol 22 (15) ◽  
pp. 1487-1495 ◽  
Author(s):  
YEXIA FAN ◽  
HONGTAO LI ◽  
LIANCHENG ZHAO
Keyword(s):  
Mass Spectrometry ◽  
Defect Structure ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Spectroscopic Characterization ◽  
Threshold Concentration ◽  
Ir Absorption ◽  
X Ray ◽  
Inductively Coupled

Congruent Ce (0.1 wt %): Cu (0.05 wt %): LiNbO 3 single crystals doped with 0, 1, 3, 4, 5, 6 mol% MgO respectively were grown by the Czochrolski method in air along the C direction. The inductively coupled plasma optical emission/mass spectrometry (ICP-OE/MS), the X-ray powder diffraction (XRD), the differential thermal analysis (DTA), the ultraviolet-visible (UV-Vis) absorption spectra and the infrared (IR) absorption spectrum were measured and discussed in terms of the spectroscopic characterization and the defect structure of the Mg:Ce:Cu:LiNbO 3 crystals. The results indicated that the Mg:Ce:Cu:LiNbO 3 crystal grown from the congruent composition melt showed large [ Li ]/[ Nb ] ratios, which was closer to stoichiometry, an increase in the Curie temperature and a non-linear shift in the absorption edge with MgO concentration increasing. The threshold concentration of MgO in Mg:Ce:Cu:LiNbO 3 of nearly 5.52 mol% was estimated.

scholarly journals Paramagnetism of cobalt-doped ZnO nanoparticles obtained by microwave solvothermal synthesis

2015 ◽  
Vol 6 ◽  
pp. 1957-1969 ◽  
Author(s):  
Jacek Wojnarowicz ◽  
Sylwia Kusnieruk ◽  
Tadeusz Chudoba ◽  
Stanislaw Gierlotka ◽  
Witold Lojkowski ◽  
...  
Keyword(s):  
Solvothermal Synthesis ◽  
Quantum Interference ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Spherical Particles ◽  
Emission Spectrometry ◽  
Initial State ◽  
X Ray ◽  
Inductively Coupled ◽  
State Present

Zinc oxide nanopowders doped with 1–15 mol % cobalt were produced by the microwave solvothermal synthesis (MSS) technique. The obtained nanoparticles were annealed at 800 °C in nitrogen (99.999%) and in synthetic air. The material nanostructure was investigated by means of the following techniques: X-ray diffraction (XRD), helium pycnometry density, specific surface area (SSA), inductively coupled plasma optical emission spectrometry (ICP-OES), extended X-ray absorption fine structure (EXAFS) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and with magnetometry using superconducting quantum interference device (SQUID). Irrespective of the Co content, nanoparticles in their initial state present a similar morphology. They are composed of loosely agglomerated spherical particles with wurtzite-type crystal structure with crystallites of a mean size of 30 nm. Annealing to temperatures of up to 800 °C induced the growth of crystallites up to a maximum of 2 μm in diameter. For samples annealed in high purity nitrogen, the precipitation of metallic α-Co was detected for a Co content of 5 mol % or more. For samples annealed in synthetic air, no change of phase structure was detected, except for precipitation of Co3O4 for a Co content of 15 mol %. The results of the magentometry investigation indicated that all as-synthesized samples displayed paramagnetic properties with a contribution of anti-ferromagnetic coupling of Co–Co pairs. After annealing in synthetic air, the samples remained paramagnetic and samples annealed under nitrogen flow showed a magnetic response under the influences of a magnetic field, likely related to the precipitation of metallic Co in nanoparticles.

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