Novel hierarchical CdS crystals by an amino acid mediated hydrothermal process

Qiu, Weiming; Xu, Mingsheng; Yang, Xi; Chen, Fei; Nan, Yaxiong; Chen, Hongzheng

doi:10.1016/j.jallcom.2011.05.103

Cited by 32 publications

(23 citation statements)

References 51 publications

(67 reference statements)

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“…Indeed, a range of different amino acids have previously been shown to serve as capping ligands for CdS, including Arg, Met, Val, Glu, Asp, Gly, His, Pro, Ser, and Trp. [28][29][30] Thus, while the chemical mode by which the four selected additives serve as binding ligands is well established, [ 26 ] the possibility that they could act in concert to control CdS superstructure formation would have been diffi cult to predict a priori, without the use of genetic algorithm-based optimization and rapid reaction screening.…”

Section: Doi: 101002/adma201403185mentioning

confidence: 99%

Genetic Algorithm‐Guided Discovery of Additive Combinations That Direct Quantum Dot Assembly

et al. 2014

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these techniques are limited by the requirement for complex enzymatic reactions. As an alternative strategy that bypasses the need for genetic engineering, combinatorial methods can be employed. These can be used to explore tens to hundreds of reaction conditions, where the most promising or "lead" conditions may be selected based on the structures or properties of the resultant material. [ 17,18 ] Lead conditions can then be used to narrow the reaction landscape in successive screening rounds. Surprisingly, although combinatorial methods are often used in solid-state chemistry to explore, for example, different reagent compositions, [ 18 ] we are not aware of their use in identifying soluble additives capable of directing mineralization.In this article we demonstrate how combinatorial methods can be used in conjunction with effi cient screening processes to rapidly identify combinations of small organic molecules that are capable of directing the formation of photoluminescent quantum dot minerals in aqueous solution and at room temperature. Indeed, a key feature of biomineralization processes is that control over mineral formation is achieved using many soluble additives that operate in concert. That this feature has seldom been addressed in bioinspired methods is almost certainly due to the vast number of potential variables, which renders a full, systematic exploration intractable. As a solution to this challenge, we here utilize a genetic algorithm as a bioinspired heuristic that mimics natural evolution. Genetic algorithms use selection, recombination, and mutation strategies to rapidly identify and optimize the combination of conditions (here, soluble additives), which gives rise to materials with target properties. [ 19 ] Using a pipetting robot to prepare reaction sets and a UV-light table to rapidly assess the reactions for the formation of photoluminescent minerals, we are able to rapidly identify the key additives that promote the formation of quantum dot superstructures from one-pot aqueous reactions.Our initial library of organic mediators included 23 components, of which 17 were amino acids and 6 were surfactants. Stock solutions of the amino acids were prepared to initial concentrations of 100 × 10 −3 M , and explored at concentrations ranging from 0.01 to 50 × 10 −3 M , while surfactants were prepared to near their solubility limits in water. Surfactants were included as potential structure-directing agents to drive hierarchical assembly in aqueous solution. The overall screening approach used to identify the key additive set is summarized in Figure 1 . First, library amino acids and surfactants were randomly mixed in 48 wells of a multi-well plate, such that each well contained between 1-6 amino acids and 1-3 surfactants (Figure 1 A). Cadmium chloride and thioacetic acid (as a sulfur source) [ 20 ] were then added to a concentration of 1 × 10 −3 M in all wells, as precursors for CdS. After 3 d the plate was viewed under UV illumination (Figure 1 A) and with a fl uorimetric Biomineralization, whi...

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Section: Doi: 101002/adma201403185mentioning

confidence: 99%

Genetic Algorithm‐Guided Discovery of Additive Combinations That Direct Quantum Dot Assembly

et al. 2014

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“…Among various shapes, the fractal dendrites have attracted considerable interests due to their importance in connecting fractal growth phenomena to crystallography research and their potential applications [2,3]. Therefore, many efforts have been reported on the preparation of the dendritic nano/microstructures, such as metals, metal oxide, alloys and transition metal compound, and so on [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A complexant-assisted hydrothermal route for the synthesis of nickel phosphide

Liu

Zhu

et al. 2014

J Mater Sci

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Dendritic Ni 2 P microstructures were successfully synthesized by a facile hydrothermal route. X-ray powder diffraction, energy dispersive X-ray spectrometer analysis, and Field-emission scanning electron microscopy were used to characterize the as-obtained products. The results showed that the as-prepared product had a hexagonal phase and was composed of a large quantity of welldefined dendrites which have the secondary branch-like structure. Further study shows that the morphology of the as-obtained Ni 2 P microstructures was highly dependent on the amount of ethylenediamine tetraacetic acid, the reaction temperature, and the reaction time. Then based on some captured intermediates, a possible growth mechanism of the as-obtained Ni 2 P dendrites was proposed.

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“…Over the past few years, considerable efforts have been made to control the size and shape of CdS nanocrystals [10][11][12][13][14][15][16]. In particular, one-dimensional (1D) CdS nanostructures are intensively explored because of their unique physical-chemical properties [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%