Symmetry-Controlled Colloidal Nanocrystals:  Nonhydrolytic Chemical Synthesis and Shape Determining Parameters

Jun, Young‐wook; Lee, Jae Hyun; Choi, Jin Woo; Cheon, Jinwoo

doi:10.1021/jp052257v

Cited by 269 publications

(197 citation statements)

References 74 publications

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“…It has been shown that a strong interaction exists between the surfaces of nanoparticles and PVP through coordination bonding with the O and N atoms of the pyrrollidone ring. [30,31] We believe that PVP as capping molecules can selectively stabilize the {111} faces since it can strongly interacts with the charged {111} faces containing Pb or S only rather than the uncharged {100} faces which contain mixed Pb/S [32] through coordination bonding, which is similar to the interaction reported by Qi. [21] So the surface energy of the {111} faces decrease largely leading to further greater accelerated growth on the {100} faces relative to the {111} faces.…”

Section: Resultssupporting

confidence: 68%

A Highly Regular Hexapod Structure of Lead Sulfide: Solution Synthesis and Raman Spectroscopy

Zhang

Guo

Yin

et al. 2007

Chemistry A European J

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A highly regular hexapod-like structure of PbS with six symmetric arms has been synthesized by a simple and mild chemical solution route. The hexapod-like PbS structure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). The results show that each arm is perpendicular to the other four, and opposite to the last one. The arms are about 0.3-0.6 microm long, which have about 40-60 nm tips and 150-200 nm base. And the arm shows an icicle-like structure and some clear steps, and grows along 100 directions. The most possible growth mechanism discussed herein is based on the characterization results. The Raman spectra of the hexapod-like PbS structure were investigated. The results show that our products are sensitive to the laser and can be photodegraded easily.

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Section: Resultssupporting

confidence: 68%

A Highly Regular Hexapod Structure of Lead Sulfide: Solution Synthesis and Raman Spectroscopy

Zhang

Guo

Yin

et al. 2007

Chemistry A European J

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“…Each dodecanethiol molecule can coordinate with three Pb ions on the surface, thus leading to a strong m 3 -Pb 3 ÀSR bond. [14] The scheme and detailed discussion are shown in Figure S6 in the Supporting Information. The dodecanethiol absorbs more firmly onto the {111} facet than on the {100} facet.…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

A Facile “Dispersion–Decomposition” Route to Metal Sulfide Nanocrystals

Zhuang

Peng

et al. 2011

Chemistry A European J

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In this paper, we demonstrate a simple and general "dispersion-decomposition" approach to the synthesis of metal sulfide nanocrystals with the assistance of alkylthiol. This is a direct heating process without precursor injection. By using inorganic metal salts and alkylthiol as the raw materials, high-quality Ag(2)S, Cu(2)S, PbS, Ni(3)S(4), CdS, and ZnS nanocrystals were successfully synthesized. The mechanism study shows that the reaction undergoes two steps. A key intermediate compound, metal thiolate, is generated first. It melts and disperses into the solvent at a relatively low temperature, and then it decomposes into metal sulfide as a single precursor upon heating. This method avoids using toxic phosphine agent and injection during the reaction process. The size and shape of the nanocrystal can be also controlled by the concentration of the reactant and ligands. Furthermore, the optical properties and assembly of the nanocrystals have also been studied. This report provides a facile, direct-heating "dispersion-decomposition" approach to synthesize metal sulfides nanocrystals that has potential for future large-scale synthesis.

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“…15,16 Crystals with simple shapes, such as spheres, cubes and octahedrons, are formed to minimize the total surface free energy in thermodynamic equilibrium. However, crystals with branched shapes, such as hexapods and octapods, are formed by kinetic growth processes.…”

Section: Notesmentioning

confidence: 99%

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Kim¹,

Kim²,

Park³

et al. 2011

Bulletin of the Korean Chemical Society

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The selective synthesis of inorganic oxides with unique morphology has attracted considerable interest because of their morphology-dependent properties and applications. 1-3Efforts on most synthetic inorganic oxides have been focused on preparing a stable morphology rather than providing a strategy for producing various morphologies. Therefore, well-controlled methods for synthesizing inorganic oxides with a systematic evolution of morphology should be developed by adjusting the experimental conditions. Among the morphology-controlled syntheses of inorganic oxides, cuprous oxide (Cu 2 O) has been widely investigated due to its ease of preparation.4-8 The morphology-dependent photocatalytic and antibacterial properties of Cu 2 O were also studied recently.9-11 Although Cu 2 O and silver oxide (Ag 2 O) have similar cubic crystal structures, relatively little is known about the morphology-controlled synthesis and physical properties of Ag 2 O.12,13 To date, a study of the morphology-dependent antibacterial effect of Ag 2 O has reported only for different polyhedral shapes including octahedrons, truncated octahedrons, and cubes.14 This study provided a simple precipitation method for the morphological evolution of Ag 2 O from cubes to octapods. Furthermore, the morphology-dependent antibacterial activity of Ag 2 O against E. coli was also examined.Ag 2 O products with various morphologies were prepared from a silver-pyridine (Py) complex solution. Figure 1 shows the X-ray diffraction (XRD) patterns of Ag 2 O prepared using different amounts of AgNO 3 with 1.0/ 40/10 molar ratios of AgNO 3 /pyridine/NaOH, respectively. All peaks corresponded to those reported for bulk Ag 2 O (JCPDS 12-0793, a = 0.4736 nm) with a cubic structure and impurities. Figure 2 shows scanning electron microscopy (SEM) images of Ag 2 O prepared with different amounts of AgNO 3 . At 2.5 mL of AgNO 3 , Ag 2 O formed a regular cubic shape, as shown in Figure 2(a). The mean length of each side was 600 nm. At 5.0 mL of AgNO 3 , Ag 2 O formed a cubic shape, and the mean length of each side was 700 nm. Void spaces were created at the center of the cubic crystal planes, as shown in Figure 2 (b). When the amount of AgNO 3 was increased to 7.5 mL, the void spaces at the center of the cubic crystal planes increased further, as shown in Figure 2(c). As the amount of AgNO 3 was increased up to 20 mL, octapods with eight identical Ag 2 O horns were formed (Figure 2(d)).

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Symmetry-Controlled Colloidal Nanocrystals: Nonhydrolytic Chemical Synthesis and Shape Determining Parameters

Cited by 269 publications

References 74 publications

A Highly Regular Hexapod Structure of Lead Sulfide: Solution Synthesis and Raman Spectroscopy

A Highly Regular Hexapod Structure of Lead Sulfide: Solution Synthesis and Raman Spectroscopy

A Facile “Dispersion–Decomposition” Route to Metal Sulfide Nanocrystals

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

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Symmetry-Controlled Colloidal Nanocrystals: Nonhydrolytic Chemical Synthesis and Shape Determining Parameters

Cited by 269 publications

References 74 publications

A Highly Regular Hexapod Structure of Lead Sulfide: Solution Synthesis and Raman Spectroscopy

A Highly Regular Hexapod Structure of Lead Sulfide: Solution Synthesis and Raman Spectroscopy

A Facile “Dispersion–Decomposition” Route to Metal Sulfide Nanocrystals

Morphological Evolution of Ag2O Microstructures from Cubes to Octapods and Their Antibacterial Activities

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Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities