Shape‐Controlled Synthesis and Self‐Assembly of Hexagonal Covellite (CuS) Nanoplatelets

Du, Weimin; Qian, Xuefeng; Ma, Xiaodong; Gong, Qiang; Cao, Hongliang; Yin, Jie

doi:10.1002/chem.200601368

Cited by 154 publications

(141 citation statements)

References 56 publications

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“…In general, this factor depends on the nature of the material and on the environmental conditions. It is well known that the anisotropic structure of CuS is beneficial for the formation of platelike CuS [20].On the basis of the above analyses and the experiment results, we propose the following growth mechanism for the nanoplate-based architectures. At the initial stage, CuS nuclei are formed through the reaction of Cu 2+ and S 2-in EG.…”

Section: Methodsmentioning

confidence: 88%

Optical, photocatalytic properties of novel CuS nanoplate‐based architectures synthesised by a solvothermal route

Kong

et al. 2009

Cryst. Res. Technol.

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CuS architectures were successfully prepared by a simple solvothermal route without any surfactant, in which copper nitrate trihydrate and element sulfur were used as reactants. The products were characterized by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. The optical properties of CuS architectres were investigated by Raman spectrometer, ultraviolet-visible spectroscopy, and fluorescence spectrophotometer. The results showed that the CuS architectures were hexagonal-structured phase and composed of intersectional nanoplates. UV-Vis absorption peaks of CuS architectures showed large blue shifts and PL spectrum exhibited a strong blue emission and a weak green emission. Photocatalytic activity of the CuS architectures was evaluated by measuring the decomposition rate of methylene blue solution under solar light. The CuS architectures show good photocatalytic activity. The effects of the molar ratio of Cu:S and the growth time on the synthesis of CuS crystalline were discussed and the growth mechanism of CuS nanoplate-based architectures was also proposed.

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Section: Methodsmentioning

confidence: 88%

Optical, photocatalytic properties of novel CuS nanoplate‐based architectures synthesised by a solvothermal route

Kong

et al. 2009

Cryst. Res. Technol.

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“…18 Details of the synthesis are provided in the Supporting Information (SI). The morphology and structural features of CuS NDs are studied by transmission electron microscopy (TEM), and highresolution TEM (HRTEM), and X-ray diffraction (XRD).…”

mentioning

confidence: 99%

Ultrafast Hole Trapping and Relaxation Dynamics in p-Type CuS Nanodisks

Ludwig

Pattengale

et al. 2015

J. Phys. Chem. Lett.

112

105

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CuS nanocrystals are potential materials for developing low-cost solar energy conversion devices. Understanding the underlying dynamics of photoinduced carriers in CuS nanocrystals is essential to improve their performance in these devices. In this work, we investigated the photoinduced hole dynamics in CuS nanodisks (NDs) using the combination of transient optical (OTA) and X-ray (XTA) absorption spectroscopy. OTA results show that the broad transient absorption in the visible region is attributed to the photoinduced hot and trapped holes. The hole trapping process occurs on a subpicosecond time scale, followed by carrier recombination (∼100 ps). The nature of the hole trapping sites, revealed by XTA, is characteristic of S or organic ligands on the surface of CuS NDs. These results not only suggest the possibility to control the hole dynamics by tuning the surface chemistry of CuS but also represent NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page. Letters, Vol 6, No. 14 (2015): pg. 2671-2675. DOI. This article is © American Chemical Society and permission has been granted for this version to appear in e-Publications@Marquette. American Chemical Society does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from American Chemical Society. Journal of Physical Chemistry3 the first time observation of hole dynamics in semiconductor nanocrystals using XTA.Keywords: CuS nanodisks; energy conversion; optical transient absorption spectroscopy; X-ray transient absorption spectroscopyCopper sulfides (Cu2-xS), well-known p-type semiconductors due to the stoichiometric deficiency of copper in the lattice, have attracted considerable attention because of their broad applications in diverse fields including photovoltaics, photocatalysis, batteries, chemical sensing, and electronics. [1][2][3][4] There are several stable Cu2-xS phases with the stoichiometric factor x ranging between 0 and 1, from the copperrich chalcocite (Cu2S) to the copper-deficient composition (CuS). Among them, the hexagonal covellite (CuS) is of particular interest due to its significant density of free carriers (holes) in the valence band accounting for its unique metallic conductivity and the strong localized surface plasmon resonance (LSPR) in NIR.5-8 These characteristics, together with its suitable band gap (2.2 eV), make CuS potentially ideal as low-cost light-harvesting and charge-transport materials in photovoltaics and photocatalysis. 7,[9][10][11] The successful utilization of CuS nanocrystals in photocatalysis and photovoltaic devices largely depends on the trapping and relaxation dynamics of charge carriers in CuS nanocrystals. Due to the larger amount of surface states in nanocrystals compared to the bulk materials, the electrons and holes in nanocrystals can be readily trapped at those surface states after photoexcitation, whic...

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“…They could show that a higher concentration of the Sn complex resulted in the formation of larger and thinner nanoplates, which suggests that the Sn complex can inhibit the growth of the particles along the <001> direction, while it promotes the growth along the <100> and <010> directions. Also Cu(II) sulphide (covellite) can form nanoplates [28,42,43]. The twodimensional growth is facilitated by its pseudographitic structure, containing layers of S atoms bond only by van-der-Waals interaction.…”

Section: Colloidal Synthesis Of Copper Sulphide Nanocrystalsmentioning

confidence: 99%

“…Especially, the nanoplate-shaped copper sulphide nanocrystals have a tendency to form ordered columnar nanostructures, which minimize their surface energy [28,41,42,[55][56][57][58][59][60][61][62][63][64][65][66]. The ligand shell plays an important role in this self-assembly process.…”

Section: Examples Of Self-organized Copper Sulphide Nanostructuresmentioning

confidence: 99%

Colloidal Copper Sulphide Based Nanocrystals as Building Blocks for Self-assembled Nanostructures

Kolny‐Olesiak

Parisi

2015

Bottom-Up Self-Organization in Supramolecular Soft Matter

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Copper sulphide nanocrystals have an enormous application potential due to their interesting properties, low toxicity and the earth abundance of copper and sulphur. During the last years, a variety of synthetic methods has been developed, which allow for size and shape control of different nanocrystalline copper sulphide polymorphs with stoichiometry between CuS and Cu 2 S. Furthermore, several copper sulphide-based colloidal hybrid nanostructures have been described, in which the properties of the copper sulphide particles could be modified by the presence of another semiconductor material. This chapter gives an overview of some recent methods developed for the generation of size-and shape-controlled colloidal copper sulphide nanocrystals. Furthermore, examples of self-assembled copper sulphide superlattices and the driving force of their formation are discussed. IntroductionThe field of nanochemistry rapidly evolved since the discovery of the quantum size effect in the early eighties [1,2]. The size and shape dependent phenomena observed in nanostructured matter are not only interesting from the point of view of basic research; they also opened up completely new strategies to manipulate the properties of materials and to generate custom made structures for a variety of applications [3][4][5][6][7][8][9][10][11]. However, controlling their properties is only one prerequisite for the successful, wide-spread application of nanocrystalline materials. Other aspects, such as, toxicity, availability of the ingredients and the production costs have also to be taken into consideration. High toxicity severely limits the application potential of semiconductor materials, such as, cadmium or lead chalcogenides, which were particularly

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Shape‐Controlled Synthesis and Self‐Assembly of Hexagonal Covellite (CuS) Nanoplatelets

Cited by 154 publications

References 56 publications

Optical, photocatalytic properties of novel CuS nanoplate‐based architectures synthesised by a solvothermal route

Optical, photocatalytic properties of novel CuS nanoplate‐based architectures synthesised by a solvothermal route

Ultrafast Hole Trapping and Relaxation Dynamics in p-Type CuS Nanodisks

Colloidal Copper Sulphide Based Nanocrystals as Building Blocks for Self-assembled Nanostructures

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