Morphology and Composition-Controls of Cu&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt;S Nanocrystals Using Alkyl-Amine Ligands

Itoh, Keiichi; Kuzuya, Toshihiro; Sumiyama, K.

doi:10.2320/matertrans.47.1953

Cited by 22 publications

(11 citation statements)

References 16 publications

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“…This shi can be related to the nucleation of new particles of distinct size, similar to those formed on the 1 min sample surface. Since the optical properties also depend on the size and shape of the formed particles, 53 this result supports the colour similarity cited above. For the samples immersed during 30 min onwards, the bands broadening should be related to the corrosion layer thickening.…”

supporting

confidence: 77%

The influence of the constituent elements on the corrosion mechanisms of silver alloys in sulphide environments: the case of sterling silver

et al. 2017

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The corrosion of copper and silver in sulphide environments was assessed by several analytical techniques to investigate the influence of each one on the corrosion of sterling silver. The surface colour changes with the immersion time due to the formation of corrosion products composed of particles with distinct sizes and shapes and the consequent layer thickening. Ag 2 S is the main corrosion product of silver. At early stages of corrosion, Cu develops Cu 2 O and Cu 2 S, and later Cu 2 O again. After the corrosion of sterling silver, pure Cu and Ag are compared, and the predominant influence of Cu at the first stages may be suggested whilst Ag mainly contributes to longer corrosion stages. The layer-by-layer corrosion structure observed for the sulphidation of sterling silver was not observed for its constituent elements.

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supporting

confidence: 77%

The influence of the constituent elements on the corrosion mechanisms of silver alloys in sulphide environments: the case of sterling silver

et al. 2017

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“…In the nanoscale, such values can reach 4 eV and 1.87 eV for direct and indirect transitions [4,42]. Copper sulfide has a band gap in the range 1.2-2 eV for its bulk form [43,44], with certain stoichiometries displaying indirect transitions, whereas others possess direct transitions [45,46]. Sample Sa1 has a direct band gap of 2.58 eV and an indirect one of 1.58 eV, as shown in Figure 1.…”

Section: Tauc Plots-band Gapsmentioning

confidence: 99%

Heat-Up Colloidal Synthesis of Shape-Controlled Cu-Se-S Nanostructures—Role of Precursor and Surfactant Reactivity and Performance in N2 Electroreduction

et al. 2021

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Copper selenide-sulfide nanostructures were synthesized using metal-organic chemical routes in the presence of Cu- and Se-precursors as well as S-containing compounds. Our goal was first to examine if the initial Cu/Se 1:1 molar proportion in the starting reagents would always lead to equiatomic composition in the final product, depending on other synthesis parameters which affect the reagents reactivity. Such reaction conditions were the types of precursors, surfactants and other reagents, as well as the synthesis temperature. The use of ‘hot-injection’ processes was avoided, focusing on ‘non-injection’ ones; that is, only heat-up protocols were employed, which have the advantage of simple operation and scalability. All reagents were mixed at room temperature followed by further heating to a selected high temperature. It was found that for samples with particles of bigger size and anisotropic shape the CuSe composition was favored, whereas particles with smaller size and spherical shape possessed a Cu2−xSe phase, especially when no sulfur was present. Apart from elemental Se, Al2Se3 was used as an efficient selenium source for the first time for the acquisition of copper selenide nanostructures. The use of dodecanethiol in the presence of trioctylphosphine and elemental Se promoted the incorporation of sulfur in the materials crystal lattice, leading to Cu-Se-S compositions. A variety of techniques were used to characterize the formed nanomaterials such as XRD, TEM, HRTEM, STEM-EDX, AFM and UV-Vis-NIR. Promising results, especially for thin anisotropic nanoplates for use as electrocatalysts in nitrogen reduction reaction (NRR), were obtained.

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“…Thus, additional structural characterization is needed to improve the understanding of the resulting semiconducting properties 14 . The band gaps of the known structures in the Cu-S system range from 1.2 eV (chalcocite) up to 2 eV (covellite) 16 . Moreover, several structures in the Cu-S compositional field are characterized by a liquid-like ionic conductivity at mild condition.…”

Section: Introductionmentioning

confidence: 99%

Operando SXRD study of the structure and growth process of Cu2S ultra-thin films

Giaccherini

Cinotti

Guerri

et al. 2017

Sci Rep

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Electrochemical Atomic Layer Deposition (E-ALD) technique has demonstrated to be a suitable process for growing compound semiconductors, by alternating the under-potential deposition (UPD) of the metallic element with the UPD of the non-metallic element. The cycle can be repeated several times to build up films with sub-micrometric thickness. We show that it is possible to grow, by E-ALD, Cu2S ultra-thin films on Ag(111) with high structural quality. They show a well ordered layered crystal structure made on alternating pseudohexagonal layers in lower coordination. As reported in literature for minerals in the Cu-S compositional field, these are based on CuS3 triangular groups, with layers occupied by highly mobile Cu ions. This structural model is closely related to the one of the low chalcocite. The domain size of such films is more than 1000 Å in lateral size and extends with a high crystallinity in the vertical growth direction up to more than 10 nm. E-ALD process results in the growth of highly ordered and almost unstrained ultra-thin films. This growth can lead to the design of semiconductors with optimal transport proprieties by an appropriate doping of the intra metallic layer. The present study enables E-ALD as an efficient synthetic route for the growth of semiconducting heterostructures with tailored properties.

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Morphology and Composition-Controls of Cu<I><SUB>x</SUB></I>S Nanocrystals Using Alkyl-Amine Ligands

Cited by 22 publications

References 16 publications

The influence of the constituent elements on the corrosion mechanisms of silver alloys in sulphide environments: the case of sterling silver

The influence of the constituent elements on the corrosion mechanisms of silver alloys in sulphide environments: the case of sterling silver

Heat-Up Colloidal Synthesis of Shape-Controlled Cu-Se-S Nanostructures—Role of Precursor and Surfactant Reactivity and Performance in N2 Electroreduction

Operando SXRD study of the structure and growth process of Cu2S ultra-thin films

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