Cu5FeS4 Nanoparticles With Tunable Plasmon Resonances for Efficient Photothermal Therapy of Cancers

Yuan, Lei; Hu, Weiwei; Zhang, Hui; Chen, Long; Wang, Yunlong; Wang, Qiang

doi:10.3389/fbioe.2020.00021

Cited by 21 publications

(18 citation statements)

References 32 publications

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“…11 Copper iron sulfides are attractive earth-abundant alternatives due to their low cost, useful band gaps between 0.5 and 1.25 eV, and non-toxicity. Bornite (Cu 5 FeS 4 ) is particularly interesting due to its potential (but unproven) direct band gap; 12,13 to those of copper sulfides (with large infrared LSPRs), including one report claiming tunability of the LSPR with Cu:Fe ratio, 14 while others showed absorbance with supposedly direct band gap behavior 13 or a mix of both. 15 A recent report elaborates on the optical properties of bornite by demonstrating that increasing iron content in bornite causes a resonance at 500 nm (similar to chalcopyrite) and oxidation leads to the infrared LSPR at ∼1000 nm via iron leaching.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Bornite (Cu 5 FeS 4 ) is particularly interesting due to its potential (but unproven) direct band gap; , however, there have been conflicting reports on the optical properties of bornite, potentially because the material susceptibility to oxidation confounds investigations into the structure−function relationship. Some studies report bornite absorbances similar to those of copper sulfides (with large infrared LSPRs), including one report claiming tunability of the LSPR with Cu:Fe ratio, while others showed absorbance with supposedly direct band gap behavior or a mix of both . A recent report elaborates on the optical properties of bornite by demonstrating that increasing iron content in bornite causes a resonance at 500 nm (similar to chalcopyrite) and oxidation leads to the infrared LSPR at ∼1000 nm via iron leaching .…”

Section: Introductionmentioning

confidence: 99%

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Controlled Synthesis and Exploration of Cu_xFeS₄ Bornite Nanocrystals

et al. 2021

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Plasmonic semiconductor nanocrystals (NCs) are a new and exciting class of materials that enable higher control of their localized surface plasmon resonance (LSPR) than metallic counterparts. Additionally, earth-abundant and non-toxic materials such as copper iron sulfides are gaining interest as alternatives to heavy metal-based semiconductor materials. Colloidal bornite (Cu5FeS4) is an interesting but underexplored example of a heavy metal-free plasmonic semiconductor. This report details the hot-injection synthesis of bornite yielding NCs ranging from 2.7 to 6.1 nm in diameter with stoichiometric control of the copper and iron content. The absorbance spectra of bornite NCs with different Cu:Fe ratios change at different rates as the particles oxidize and develop LSPR in the near-infrared region. X-ray photoelectron spectroscopy results indicate that oxidation produces sulfates rather than metal oxides as well as a decrease in the iron content within the NCs. Additionally, increasing iron content leads to decreases in carrier density and effective mass of the carrier, as determined by the Drude model. This controlled synthesis, combined with a further understanding of the relationship between the particle structure and optical properties, will enable the continued development and application of these fascinating heavy metal-free plasmonic semiconductor nanoparticles.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis and Exploration of Cu_xFeS₄ Bornite Nanocrystals

et al. 2021

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“…The spectrum of the CGO nanoparticle aqueous dispersion displayed high absorption in both the visible and nearinfrared regions, as shown in Figure 2A. The absorbance value was high enough in the NIR region from 600 to 1,100 nm, which showed the typical absorption properties of ternary copper-based compounds (Li et al, 2015;Yuan et al, 2020). By determining the concentration of CGO nanoparticles via ICP-AES, the extinction coefficient of the CGO nanoparticles at 808 nm was measured to be 11.3 L g −1 cm −1 .…”

Section: Resultsmentioning

confidence: 90%

CuGeO3 Nanoparticles: An Efficient Photothermal Theragnosis Agent for CT Imaging-Guided Photothermal Therapy of Cancers

Wang

Zhang

2020

Front. Bioeng. Biotechnol.

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The photothermal agents have been widely developed due to the minimally invasive treatment for targeted tumor photothermal therapy, which is considered to have great potential for antitumor bioapplications. The development of multifunctional photothermal agents is extremely challenging. This work presents a novel photothermal theragnosis agent, i.e., CuGeO 3 nanoparticles (CGO NPs), showing intense absorption in the near-infrared (NIR) window and excellent ability of CT imaging. Due to the strong NIR absorption, CGO NPs exhibit excellent photothermal effect with a photothermal conversion efficiency of 59.4%. Moreover, because of the high X-ray attenuation coefficient of germanium, the CGO NPs have a great potential of CT imaging diagnosis in clinical application. Additionally, the CGO NPs show negligible cytotoxicity in vitro and in vivo, indicating that it can be served as an outstanding contrast and anticancer agent in a biosafe way. Our work opens the way for the development of bimetallic copper-based oxides used in photothermal diagnostic agents for cancer treatment.

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“…Along with the other two satellite peaks of Cu 2– x S and Fe–Cu 2– x S at 168.1 and 168.7 eV, respectively, the existence of S 2– can be proved in the QDs. In addition, the peaks of 720.5 and 712.9 eV in Figure d can be assigned to Fe 3+ in Fe–Cu 2– x S QDs, indicating the valence state of Fe(III) in the catalyst. Therefore, it was further proved that Fe–Cu 2– x S QDs were successfully synthesized according to the above analyses.…”

Section: Resultsmentioning

confidence: 98%

Double-Phase Heterostructure within Fe-Doped Cu_2–xS Quantum Dots with Boosted Electrocatalytic Nitrogen Reduction

Zhang

Liu

Mao

et al. 2021

ACS Sustainable Chem. Eng.

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Electrochemical nitrogen reduction reaction (NRR) is considered as one of the most promising methods for NH 3 synthesis under room temperature and ambient pressure. A grand challenge of NRR is the development of efficient electrocatalysts, for which the delicate nanostructuring of catalysts plays an important role. Herein, a series of Fedoped Cu 2−x S quantum dots (QDs) are synthesized with multiple active sites and interface engineering, in which the double-phase heterostructure plays a key role for boosting NRR activity. The yield of NH 3 was obviously improved with the increase of Fe content from 0 to 3% but started to decrease with Fe from 3 to 9%. The optimized Fe 3% −Cu 2−x S QDs show an outstanding NH 3 yield of 26.4 μg h −1 mg −1 cat at −0.7 V (vs the reversible hydrogen electrode), which is 5 times higher than that of Cu 2−x S QDs. More importantly, we observed that the highest NRR activity in Fe 3% −Cu 2−x S QDs was ascribed to the formation of an inherent double-phase heterostructure of Cu 2−x S/Cu 5 FeS 4 , whereas the complete conversion to single-phase Cu 5 FeS 4 with increased Fe doping (9%) resulted in the activity decrease. Further, N 2 temperature-programmed desorption and electrochemical impedance spectra characterizations confirm the stronger chemical adsorption of N 2 and faster charge transfer in the Cu 2−x S/Cu 5 FeS 4 QDs. A plausible mechanism was proposed for the double-phase Cu 2−x S/Cu 5 FeS 4 heterostructure, where the interface provides efficient charge transfer and more active sites of Cu, Fe, and S for the synergetic adsorption and activation of N 2 . Our work provides a simple strategy for the design of NRR electrocatalysts, which may also bring new inspiration for the preparation of the inherent double-phase heterostructure within other doped QDs.

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Cu5FeS4 Nanoparticles With Tunable Plasmon Resonances for Efficient Photothermal Therapy of Cancers

Cited by 21 publications

References 32 publications

Controlled Synthesis and Exploration of Cu_xFeS₄ Bornite Nanocrystals

Controlled Synthesis and Exploration of Cu_xFeS₄ Bornite Nanocrystals

CuGeO3 Nanoparticles: An Efficient Photothermal Theragnosis Agent for CT Imaging-Guided Photothermal Therapy of Cancers

Double-Phase Heterostructure within Fe-Doped Cu_2–xS Quantum Dots with Boosted Electrocatalytic Nitrogen Reduction

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Cu5FeS4 Nanoparticles With Tunable Plasmon Resonances for Efficient Photothermal Therapy of Cancers

Cited by 21 publications

References 32 publications

Controlled Synthesis and Exploration of CuxFeS4 Bornite Nanocrystals

Controlled Synthesis and Exploration of CuxFeS4 Bornite Nanocrystals

CuGeO3 Nanoparticles: An Efficient Photothermal Theragnosis Agent for CT Imaging-Guided Photothermal Therapy of Cancers

Double-Phase Heterostructure within Fe-Doped Cu2–xS Quantum Dots with Boosted Electrocatalytic Nitrogen Reduction

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Product

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Controlled Synthesis and Exploration of Cu_xFeS₄ Bornite Nanocrystals

Controlled Synthesis and Exploration of Cu_xFeS₄ Bornite Nanocrystals

Double-Phase Heterostructure within Fe-Doped Cu_2–xS Quantum Dots with Boosted Electrocatalytic Nitrogen Reduction