Formation mechanisms of pyrite (FeS 2 ) nano-crystals synthesized by colloidal route in sulfur abundant environment

Kim, Hong Tak; Nguyen, Thao P.; Kim, Chang-duk; Park, Chinho

doi:10.1016/j.matchemphys.2014.09.024

Cited by 19 publications

(10 citation statements)

References 15 publications

(6 reference statements)

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“…For example, at 225 C, the cube was 25-50 nm; at 230 C, the cube was 50-70 nm; and at 235 C, the cube was 70-100 nm (Figure 2(a-c)). The cubes appeared arranged in spherical or irregular morphologies (illustrations down of Figure 2(a,b)) similar to that reported by Kim [26], and show promise as electrode material for lithium-ion batteries [27,28] or for mercury removal [14].…”

Section: Determination Of Crystal Structure and Morphologysupporting

confidence: 79%

Colloidal synthesis of biocompatible iron disulphide nanocrystals

Santos‐Cruz

Núñez-Anita

Mayén-Hernández

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

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The aim of this research was to synthesis biocompatible iron disulphide nanocrystals at different reaction temperatures using the colloidal synthesis methodology. Synthesis was conducted at the 220-240 °C range of reaction temperatures at intervals of 5 °C in an inert argon atmosphere. The toxicity of iron disulphide nanocrystals was evaluated in vitro using mouse fibroblast cell line. Two complementary assays were conducted: the first to evaluate cell viability of the fibroblast via an MTT assay and the second to determine the preservation of fibroblast nuclei integrity through DAPI staining, which labels nuclear DNA in fluorescence microscopes. Through TEM and HRTEM, we observed a cubic morphology of pyrite iron disulphide nanocrystals ranging in sizes 25-50 nm (225 °C), 50-70 nm (230 °C) and >70 nm (235 °C). Through X-ray diffraction, we observed a mixture of pyrite and pyrrohotite in the samples synthesized at 225 °C and 240 °C, showing the best photocatalytic activity at 80% and 65%, respectively, for the degradation of methylene blue after 120 minutes. In all experimental groups, iron disulphide nanocrystals were biocompatible, i.e. no statistically significant differences were observed between experimental groups as shown in a one-way ANOVA and Tukey's test. Based on all of these results, we recommend non-cytotoxic semiconductor iron sulphide nanocrystals for biomedical applications.

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Section: Determination Of Crystal Structure and Morphologysupporting

confidence: 79%

Colloidal synthesis of biocompatible iron disulphide nanocrystals

Santos‐Cruz

Núñez-Anita

Mayén-Hernández

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

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“…Where I ph is the photocurrent, I dark is the dark current and P opt is the optical power of the UV source, c, e and  are represented blank constant, light speed, electron charge and wavelength used, respectively. According to the relations (5)(6)(7)(8), the results can be found in Table3, at a wavelength of 365, 385 nm is as a function applied voltage.…”

Section: Characteristic Of the Uv Detectormentioning

confidence: 99%

“…Different doping in ZnO (i.e., Mg) can adjust bandgap to make UV photodetectors in different UV region. There were several reports focused on efforts to control the properties of ZnO by adding the transition metal impurities such as Al [3,4], Cu [5], Co [6], In [7], and Mg [3,8] Doping work to control and adjust the band gap, which greatly contribute to increase the efficiency and power, and in many applications, such as Light-emitting diodes [9], laser diodes [10], solar cells, transparent electrodes, thin film transistors and optical sensors [3,11]. The ZnO sensing mechanism is highly correlated with surface reactions hence; oxygen absorption, grain size, defects, and other parameters have an important effect in controlling the sensing response.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Ultraviolet Photodetector Based on Mg-Doped ZnO Nanorods Films

Hameed

2019

MJS

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Magnesium-doped zinc oxide (ZnO: Mg) nanorods and nanotubes films were prepared by hydrothermal method deposited on glass substrates. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), photoluminescence (PL), and optical absorption spectroscopy (UV) were performed to characterize the prepared films. X-ray diffraction analysis showed a decrease in the lattice parameters of Mg doped ZnO NRs. The Photoluminescence of the undoped and Mg-doped ZnO NRs displayed a near band edge. At 10 V bias, the metal-semiconductor-metal (MSM) ultraviolet (UV) photodetector performance of the Mg-doped ZnO prepared for various Mg concentrations of 0.0, 0.02, and 0.06 was investigated under radiation of 40μW/cm2 at the wavelengths of 365 and 385 nm UV light. The responsivity, detectivity and quantum efficiency of Mg-doped based on MSM detector were 0.118A/W, 1.0579*1012 and 40.05157 under UV of wavelength 365nm respectively.

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“…Pyrite has been prepared by the hydro/solvent thermal method , the colloidal chemistry method , electrodeposition , spray pyrolysis , direct vulcanisation of the ferrous membrane , and by microwave‐assisted synthesis . However, acquiring pyrite with a homogeneous phase and stoichiometric composition requires sophisticated equipment and high temperatures, and it is a time‐consuming process.…”

Section: Introductionmentioning

confidence: 99%

Microwave‐assisted preparation of pyrite and its sensitisation of titanium dioxide in self‐cleaning aramid fabrics

Zheng

Zhou

et al. 2018

Coloration Technology

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Titanium dioxide (TiO2) dispersions were obtained by neutralising anatase nano‐titanium dioxide sols prepared by hydrolysing tetrabutyl titanate in acidic aqueous media. Pyrite was initially prepared via the microwave‐assisted method with a mixed solvent of ethylene glycol and small amounts of water, and was then used in sensitising micron‐sized titanium dioxide particles to obtain aramid fabrics with self‐cleaning properties. X‐ray diffraction demonstrated the crystalline structure of pyrite, and ultraviolet‐visible (UV‐vis) spectrum and energy‐dispersive X‐ray spectroscopy characterised the band gaps, surface status on fabrics and the distribution of the pyrite compound's titanium dioxide particles. The contact angle, UV protection factor (UPF) and photocatalytic degradation of methylene blue (MB) were used to evaluate the performance of treated aramid fabrics. Results show that pyrite‐sensitised titanium dioxide compounds obtained at pH 5 have smaller band gap energies and relatively poor wetting abilities, higher UPF values, and perform well in the photocatalytic degradation of MB. The pseudo‐first kinetic model was used to analyse elaborate sections of the curve for the degradation of MB.

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Formation mechanisms of pyrite (FeS 2 ) nano-crystals synthesized by colloidal route in sulfur abundant environment

Cited by 19 publications

References 15 publications

Colloidal synthesis of biocompatible iron disulphide nanocrystals

Colloidal synthesis of biocompatible iron disulphide nanocrystals

Enhanced Ultraviolet Photodetector Based on Mg-Doped ZnO Nanorods Films

Microwave‐assisted preparation of pyrite and its sensitisation of titanium dioxide in self‐cleaning aramid fabrics

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