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Sulfide

About: Sulfide is a research topic. Over the lifetime, 29998 publications have been published within this topic receiving 555518 citations. The topic is also known as: sulphide & sulfanediide.


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Journal ArticleDOI
TL;DR: On the basis of time-resolved spectroscopic studies of core/shell particles, it is concluded that the emission is due to an optical transition that couples a quantized electron state to a localized hole state, which is most likely associated with an internal defect.
Abstract: We report an efficient synthesis of copper indium sulfide nanocrystals with strong photoluminescence in the visible to near-infrared. This method can produce gram quantities of material with a chemical yield in excess of 90% with minimal solvent waste. The overgrowth of as-prepared nanocrystals with a few monolayers of CdS or ZnS increases the photoluminescence quantum efficiency to > 80%. On the basis of time-resolved spectroscopic studies of core/shell particles, we conclude that the emission is due to an optical transition that couples a quantized electron state to a localized hole state, which is most likely associated with an internal defect.

670 citations

01 Jan 1985
TL;DR: In this article, the authors studied aqueous, abiotic pyrite oxidation in oxygen-saturated and anaerobic Fe(III)-saturated systems, and they concluded that Fe is the more important, direct oxidant of pyrites, which is supported by theoretical consideration regarding the low probability of a direct reaction between paramagnetic molecular oxygen and diamagnetic disulfide.
Abstract: The authors studies of aqueous, abiotic pyrite oxidation in oxygen-saturated and anaerobic Fe(III)-saturated systems span pH values from 2 to 9 and include analyses of sulfite, thiosulfate, polythionates, and sulfate. In addition, they evaluated procedures for cleaning oxidation products from pyrite surfaces. As in silicate experiments, the preparation of the pyrite surface is critical to a valid interpretation of the onset of pyrite oxidation. The rates in oxygen-saturated systems (1) were relatively independent of pH, (2) gave linear sulfoxy anion production, (3) produced thiosulfate and polythionates at pH >3.9, and (4) produced intermediate sulfoxy anions only at high stirring rates. In anaerobic Fe(III)-saturated systems no intermediates were observed. From these results, along with the generally faster rate of oxidation in Fe(III)-saturated systems, we conclude that Fe(III) is the more important, direct oxidant of pyrite. This conclusion is supported by theoretical consideration regarding the low probability of a direct reaction between paramagnetic molecular oxygen and diamagnetic disulfide. The authors findings extend earlier models for the pyrite oxidation mechanism because of the larger range of experimental conditions that they have studied. Preliminary results from studies of sphalerite oxidation, in which they have found thiosulfate, support the hypothesis that thiosulfate is a keymore » intermediate related to the reaction mechanisms, independent of the bounding structure of the sulfide mineral.« less

662 citations

Journal ArticleDOI
TL;DR: In this article, the molar concentration of acid volatile sulfide (AVS) in the sediment is defined as the threshold below which these metals cease to exhibit an acute toxicity in freshwater and marine sediments.
Abstract: Laboratory toxicity tests using amphipods, oligochaetes, and snails with spiked freshwater and marine sediments and with contaminated sediments collected from an EPA Superfund site demonstrate that no significant mortality occurs relative to controls if the molar concentration of acid volatile sulfide (AVS) in the sediment is greater than the molar concentration of simultaneously extracted cadmium and/or nickel. Although it is well-known that these metals can form insoluble sulfides, it apparently has not been realized that AVS is a reactive pool of solid-phase sulfide that is available to bind metals and render that portion unavailable and nontoxic to biota. Thus, the AVS concentration of a sediment establishes the boundary below which these metals cease to exhibit an acute toxicity in freshwater and marine sediments.

642 citations

Journal ArticleDOI
TL;DR: The rational synthesis of colloidal copper(I) sulfide nanocrystals are presented and their application as an active light absorbing component in combination with CdS nanorods to make a solution-processed solar cell with 1.6% power conversion efficiency is demonstrated.
Abstract: We present the rational synthesis of colloidal copper(I) sulfide nanocrystals and demonstrate their application as an active light absorbing component in combination with CdS nanorods to make a solution-processed solar cell with 1.6% power conversion efficiency on both conventional glass substrates and flexible plastic substrates with stability over a 4 month testing period.

642 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,112
20222,156
2021994
20201,229
20191,372
20181,237