Synthesis of Mesostructured Copper Sulfide by Cation Exchange and Liquid‐Crystal Templating

Lubeck, Christopher Ryan; Han, T. Yong-Jin; Gash, Alexander E.; Satcher, Joe H.; Doyle, Fiona M.

doi:10.1002/adma.200501653

Cited by 60 publications

(59 citation statements)

References 24 publications

(25 reference statements)

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“…Generally, organic solvents have lower capacity to dissolve ionic solids since their dielectric constants are usually smaller than that of water. Nevertherless, we believe it is a reasonable approach to use the K sp value in aqueous solutions as the rough criterion to determine the direction of exchange reactions, especially for sol- 18,55 The unfavorable reaction has been known to be enabled with the aid of ligands such as trioctylphosphine (TOP) and tributylphosphine (TBP), which can form a complex with Ag ϩ , selectively increasing the solubility product of Ag 2 Te in the solution.…”

Section: Resultsmentioning

confidence: 99%

Chemical Transformations in Ultrathin Chalcogenide Nanowires

et al. 2010

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We have studied the chemical transformations in ultrathin chalcogenide nanowires with an aim to understand the parameters that control the morphology and crystal structure of the product. Ultrathin Te nanowires were transformed into Ag2Te nanowires with preservation of the single crystallinity. The Ag2Te nanowires were then converted into CdTe, ZnTe, and PbTe using cation-exchange reactions, and the CdTe nanowires were further transformed into PtTe2 nanotubes. On the basis of the solubility products of the ionic solids, the crystal structures of the involved solids, the reaction kinetics, and the reaction conditions for transformations, we were able to reach the following conclusions: (i) The solubility products of ionic solids can be used as a rough criterion to predict if the transformation is thermodynamically favorable or not. (ii) The morphological preservation of reactant nanowires is more sensitive to the change in length rather than the total volume in addition to the lattice matching between the reactant and product nanowires. (iii) The crystal structure resulting from a transformation should be determined by the free energy of formation and the stability of the products. (iv) The transformation involving small volume change or topotactic lattice matching is considered homogeneous along the entire length of the nanowires, preserving both the single crystallinity and the morphology of the reactant nanowires.

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Section: Resultsmentioning

confidence: 99%

Chemical Transformations in Ultrathin Chalcogenide Nanowires

et al. 2010

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“…Since the CuS has a peak at this angle that belongs to the (101) crystal plane, we can claim that the reaction between the paper sensor and the Cu 2+ leads to the formation of CuS and color changing from white to brown confirms this fact. 42 We postulate that the following reaction takes place and the cation in the shell of CSNPs (i.e. the Zn 2+ ) was simply exchanged with the Cu 2+ ions according to the following reaction:…”

Section: The Mechanism Of Cu 2+ Detection Sensormentioning

confidence: 99%

Colorimetric Disposable Paper Coated with ZnO@ZnS Core–Shell Nanoparticles for Detection of Copper Ions in Aqueous Solutions

Sadollahkhani

Hatamie

Nur

et al. 2014

ACS Appl. Mater. Interfaces

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In this study we have proposed a new nanoparticle-containing test paper sensor that could be used as an inexpensive, easy-to-use, portable, and highly selective sensor to detect Cu 2+ ions in aqueous solutions. This disposable paper sensor is based on ZnO@ZnS core shell nanoparticles. The core shell nanoparticles were synthesized using a chemical method and then they were used for coating the paper.The synthesis of the ZnO@ZnS core shell nanoparticles was performed at a temperature as low as 60 o C, and so far this is the lowest temperature for the synthesis of such core shell nanoparticles. The sensitivity of the paper sensor was investigated for different Cu 2+ ion concentrations in aqueous solutions and the results show a direct linear relation between the Cu 2+ ions concentration and the colour intensity of the paper sensor with a visual detection limit as low as 15 μM (~0.96 ppm). Testing the present paper sensor on real river turbulent water shows a maximum 5% relative error for determining the Cu 2+ ions concentration which confirms that the presented paper sensor can successfully be used efficiently for detection in complex solutions with high selectivity. Photographs of the paper sensor taken using a regular digital camera were transferred to a computer and analysed by ImageJ Photoshop software. This finding demonstrates the potential of the present disposable paper sensor for the development of a portable accurate and selective heavy metal detection technology.

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“…[2,24] We find the stabilizer effect surprisingly strong, and it not only affects the rate of cation replacement (as one would expect) but also radically changes the morphology of the resulting products. To understand the genesis of this effect, one should treat NPs as simple molecules, and thus, the classical kinetic description may be applied to chemical transformations, i.e., synthesis, [25][26][27][28][29][30] decomposition, [14,19] or replacement reactions, [31][32][33][34][35][36][37][38][39][40][41][42][43] occuring inside of the NPs. Going further, we arrive to the first exploration of the stabilizer effect on chemical transformation of NPs, which is paramount in the field of both theoretical study and practical applications of NPs.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Stabilizer Density on Transformation of CdTe Nanoparticles Induced by Ag Cations

et al. 2008

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Synthesis of Mesostructured Copper Sulfide by Cation Exchange and Liquid‐Crystal Templating

Abstract: Supermolecular assembly techniques combined with the cation exchange of nanoparticles transforms mesostructured CdS into mesostructured CuS (see figure). The resulting materials retain the overall integrity of the original mesostructured material after the cation‐exchange process.

Cited by 60 publications

References 24 publications

Chemical Transformations in Ultrathin Chalcogenide Nanowires

Chemical Transformations in Ultrathin Chalcogenide Nanowires

Colorimetric Disposable Paper Coated with ZnO@ZnS Core–Shell Nanoparticles for Detection of Copper Ions in Aqueous Solutions

The Effect of Stabilizer Density on Transformation of CdTe Nanoparticles Induced by Ag Cations

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