Controlling surface defects of non-stoichiometric copper-indium-sulfide quantum dots

Park, Jae Chul; Nam, Yoon Sung

doi:10.1016/j.jcis.2015.08.037

Cited by 30 publications

(18 citation statements)

References 36 publications

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“…www.nature.com/scientificreports www.nature.com/scientificreports/ Temperature dependent optical properties of CuInS and CuInS/ZnS QDs. The crystal structure, quality and optical properties of CuInS QDs can be modified by varying reaction temperature due to the large degree of freedom in the composition and lattice structure of CuInS QDs 24 . For large scale synthesis, low temperatures are ideal with direct aqueous synthesis usually performed at 90-95 °C temperature range 17,24,25 .…”

Section: Effect Of the Cu: In Ratio On The Optical Properties Of Cuinmentioning

confidence: 99%

Cytotoxicity, fluorescence tagging and gene-expression study of CuInS/ZnS QDS - meso (hydroxyphenyl) porphyrin conjugate against human monocytic leukemia cells

Tsolekile

Nahle

Zikalala

et al. 2020

Sci Rep

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The toxicity of heavy metals present in binary semiconductor nanoparticles also known as quantum dots (QDs) has hindered their wide applications hence the advent of non-toxic ternary quantum dots. These new group of quantum dots have been shown to possess some therapeutic action against cancer cell lines but not significant enough to be referred to as an ideal therapeutic agent. In this report, we address this problem by conjugating red emitting CuInS/ZnS QDs to a 5,10,15,20-tetrakis(3hydroxyphenyl)porphyrin-photosensitizer for improved bioactivities. The glutathione capped CuInS/ ZnS QDs were synthesized in an aqueous medium using a kitchen pressure cooker at different Cu: In ratios (1:4 and 1:8) and at varied temperatures (95 °C, 190 °C and 235 °C). Optical properties show that the as-synthesized CuInS/ZnS QDs become red-shifted compared to the core (CuInS) after passivation with emission in the red region while the cytotoxicity study revealed excellent cell viability against normal kidney fibroblasts (BHK21). The highly fluorescent, water-soluble QDs were conjugated to 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin (mTHPP) via esterification reactions at room temperature. The resultant water-soluble conjugate was then used for the cytotoxicity, fluorescent imaging and gene expression study against human monocytic leukemia cells (THP-1). Our result showed that the conjugate possessed high cytotoxicity against THP-1 cells with enhanced localized cell uptake compared to the bare QDs. In addition, the gene expression study revealed that the conjugate induced inflammation compared to the QDs as NFKB gene was over-expressed upon cell inflammation while the singlet oxygen (1 o 2) study showed the conjugate possessed large amount of 1 o 2 , three times than the bare porphyrin. Thus, the as-synthesized conjugate looks promising as a therapeutic agent for cancer therapy. The use of nanomaterials for biological application has in the past decade transpired as a promising avenue to explore for biological application due to their size, shape, specific surface area, aspect ratio and surface chemistry. Of the reported nanomaterial, semiconductor nanomaterials also known as quantum dots (QDs) still remain the most promising due to their excellent optoelectronic properties and spectral tunability which allows for their use in the ultraviolet and near infra-red region 1,2. These inherent properties have made QDs more appealing

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Section: Effect Of the Cu: In Ratio On The Optical Properties Of Cuinmentioning

confidence: 99%

Cytotoxicity, fluorescence tagging and gene-expression study of CuInS/ZnS QDS - meso (hydroxyphenyl) porphyrin conjugate against human monocytic leukemia cells

Tsolekile

Nahle

Zikalala

et al. 2020

Sci Rep

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“…[7][8][9] Stokes shift is the spectral difference in the position of the band maximum of the emission and absorbance, which greatly reduces the overlap between emission and absorption to suppress the problem of FRET/re-absorption losses. [10,11] This phenomena has been immensely studied and investigated in different systems including Cadmium, [12] Copper, [13] Indium [14] and Zinc, [15] etc, but recently it was observed in the system of inorganic lead halides (CsPbX 3 ; X=Cl, Br, I). [16] The underlined mechanism of achieving this phenomenon is still controversial but some details are unpinned.…”

Section: Introductionmentioning

confidence: 99%

Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

et al. 2022

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Inorganic metal halide perovskite system is considered as a promising candidate for applications from display to biomedical industry. Intrinsic inorganic lead halides possess small Stokes shift or self‐absorption, providing negative impact for both photo voltaic and biomedical applications. Therefore, the development of an inorganic halide perovskite system with large Stokes shift is a significant venture. This review aims to provide an updated survey of the Stokes shift phenomena in the inorganic lead halide perovskites. The first section focuses about the mechanism, the second section gives different approaches in preparing inorganic perovskites with distinct Stokes shift, while the third section highlights the potential applications in both photovoltaic and biomedical areas. This review provides deep insight about the importance and usefulness of such phenomena in inorganic lead halides, essential for various applications.

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“…Within ternary chalcogenide semiconductors chalcostibite (CuSbS2) is an emerging one due to its suitable bandgap. It is relatively less explored in comparison with CuInS2 [13,14], Cu(InGa)Se2 [15], and Cu2ZnSnS4 [16,17] and has been demonstrated as a promising alternative, because all elemental components of CuSbS2 are earth abundant and economical, as the price of antimony is much lower than that of indium [18]. First-principle calculations using density functional theory have indicated CuSbS2 as a new promising candidate for a p-type absorber material [19].…”

Section: Introductionmentioning

confidence: 99%

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

Moosakhani

Alvani

Mohammadpour

et al. 2018

Journal of Alloys and Compounds

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Chalcostibite copper antimony sulfide (CuSbS2) micro-and nanoparticles with a different shape and size have been prepared by a new approach to hot injection route. In this method, sulfur in oleylamine (OLA) is employed as a sulfonating agent providing a simple route to control the shape and size of the particles, which enables the optimization of CuSbS2 for a variety of applications. The sulfur to metallic precursor ratio appears to be one of the most effective parameters along with the temperature and time for controlling the size and morphology of the particles. The growth mechanism study shows in addition to the CuSbS2 phase the presence of not previously observed intermediate phases (stibnite (Sb2S3) and famatinite (Cu3SbS4)) at the initial stage of the reaction. By increasing the ratio of sulfur to copper and antimony, wider and thinner CuSbS2 particles are obtained. The particles have nanoplate and nanosheet morphology with a good shape and size uniformity. Coalescence of very thin nanosheets occurs with increasing reaction time eventually leading to formation of thicker particles which can be called nanobricks. Band gap determinations demonstrate that the obtained CuSbS2 particles have both direct (1.51-1.57 eV) and indirect (1.44-1.51 eV) bandgaps. Transmission Electron Microscopy (TEM) studies revealed that the preferred growth directions are along the basis axes of the unit cell ([100] and [010]). Optical and structural properties of the obtained CuSbS2 particles are indicative for their great potential in different generations of solar cells and supercapacitor applications.

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Controlling surface defects of non-stoichiometric copper-indium-sulfide quantum dots

Cited by 30 publications

References 36 publications

Cytotoxicity, fluorescence tagging and gene-expression study of CuInS/ZnS QDS - meso (hydroxyphenyl) porphyrin conjugate against human monocytic leukemia cells

Cytotoxicity, fluorescence tagging and gene-expression study of CuInS/ZnS QDS - meso (hydroxyphenyl) porphyrin conjugate against human monocytic leukemia cells

Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

Solution synthesis of CuSbS 2 nanocrystals: A new approach to control shape and size

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