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Effect of CuS nanocrystalline particles on counter electrodes of multi-wall carbon nanotubes for QDSCs
摘要： CuS nanocrystalline particles are deposited into the acid-treated multi-wall carbon nanotubes (MWCNTs) film on the fluorine-doped tin oxide glass substrate through the successive ionic layer adsorption and reaction combined with spin-coating technology to form MWCNTs/CuS composite counter electrode (CE). The CuS adding amount is changed in different cycles to discuss its effect mechanism on the photoelectric properties of MWCNTs/CuS composite CE based quantum dot sensitized solar cells (QDSCs). The TiO2 photoanodes are prepared by the electrospinning technique with CdS and ZnS as co-sensitizer. QDSCs are assembled with photoanodes, the polysulfide electrolyte and abovementioned CEs. The CEs are characterized by X-ray diffraction, transmission electron microscope and energy dispersed X-ray detector, which verifies CuS nanocrystalline particles are attached to MWCNTs successfully. The photoelectric properties are analyzed by Nyquist, Tafel and J–V curves. The results show that the introduction of CuS nanocrystalline particles can promote reduction rate of polysulfide species and the short circuit current density (Jsc) to improve catalytic activity, leading to a higher power conversion efficiency (PCE). The MWCNTs based CE with deposition CuS in eight cycles exhibits the best photoelectric performance within all CE samples and the electrical conductivity of MWCNTs/8CuS CE is superior to that of Pt CE according to Nyquist and Tafel curve analysis. PCE of QDSCs with MWCNTs/8CuS CE is up to 5.186%, which is a little lower than that of Pt CE (5.250%), but it possesses a higher Jsc value (18.028?mA cm?2) than that of Pt CE (16.057?mA cm?2). The low-cost MWCNTs/CuS composite CE with simple preparation is more suitable than Pt CE for commercial application of QDSCs.
关键词： multi-wall carbon nanotubes,quantum dot sensitized solar cells,CuS nanocrystalline particles,photoelectric properties,counter electrode
更新于2025-09-10 09:29:36
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Hollow CuS nanocube as nanocarrier for synergetic chemo/photothermal/photodynamic therapy
摘要： Here, hollow CuS nanocubes about 250-300 nm in size were synthesized based on the Kirkendall effect by using CuO nanocubeas precursor and template. The reactant concentration and reaction time could be adopted to adjust the final composition and hollow structure. The as-synthetic CuS nanocube was assembled by a great deal of nanoparticles (15-20 nm), making abundant porous structure in the shell layer. The localized surface plasmon resonance and the novel porous hollow structure (improve light reflex) further make sure the enhanced Near-infrared (NIR) light absorption as well as photothermal conversion efficiency (30.3 %). Moreover, the mechanism of reactive oxygen species (ROS) generation was investigated in detail, revealing that the released Cu+ ion and the oxygen are the determined factors. To further improve the monodispersity and biocompatibility, PEG-NH2 modified nanostructure (CuS@PEG) was prepared and it possessed high loading efficiency to doxorubicin hydrochloride (DOX). Moreover, DOX-CuS@PEG reveals the acid and NIR sensitive-release performance. The synergistic effect of chemotherapy associated with photothermal therapy (PTT) and photodynamic therapy (PDT) display the enhanced specific cytotoxicity to cancer cells.
关键词： Drug delivery,Hollow CuS,Photothermal therapy,Photodynamic therapy,NIR
更新于2025-09-10 09:29:36
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Selective castration-resistant prostate cancer photothermal ablation with CuS nanoplates
摘要： Objective: To explore new therapies for castration-resistant prostate cancer (CRPC) to improve patients’ quality of life and extend life. Materials and Methods: The synthesis, morphology analysis, phase analysis, spectral analysis and photothermal conversion test were referenced to our previous articles. Then NIR-light-driven CuS nanoplates to inhibit the growth of prostate cancer cells in vivo and in vitro was carried out. Transmission electron microscope, mCherry-LC3 syncytial virus labelling, acridine orange staining and autophagy protein were used to detect the autophagy caused by CuS nanoplates and chloroquine was used to inhibit the process of autophagy. Results: The CuS nanoplates prepared in this study feature low cytotoxicity, simple preparation and high photothermal conversion efficiency. Driven by 980nm near-infrared light, CuS nanoplates could inhibit the growth of prostate cancer cells in vivo and in vitro, while triggering the autophagy and cytoprotection of prostate cancer cells. Conclusions: CuS nanoplates are a kind of commendable photothermal therapy agent in CRPC treating. Autophagy inhibition enhances the photothermal efficiency of CuS nanoplates, which indicates favorable application prospects in the treatment of advanced prostate cancer.
关键词： CuS nanoplates,Autophagy,Photothermal therapy,CRPC
更新于2025-09-10 09:29:36
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Synthesis and characterizations of a novel CoFe2O4@CuS magnetic nanocomposite and investigation of its efficiency for photocatalytic degradation of penicillin G antibiotic in simulated wastewater
摘要： In the present study, efficiency of a new magnetic nanocomposite (CoFe2O4@CuS) for photocatalytic degradation of PG in aqueous solutions was investigated. Structural characteristics of synthesized magnetic nanoparticles were determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), vibrating-sample magnetometer (VSM), Thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET), Energy-dispersive X-ray spectroscopy (EDX) and Raman spectroscopy. Also, the effect of important parameters such as pH (3–11), nanoparticle dosage (0.1-0.8 g/L), PG concentration (10–100 mg/L) and contact time (10–120 min) were investigated. Results of FT-IR, XRD, EDX and Raman analyses showed successful synthesis of CoFe2O4@CuS magnetic nanocomposite. SEM and TEM images showed that the size of CoFe2O4@CuS magnetic nanocomposite was below 100 nm. Also, results of VSM analyses showed that CoFe2O4@CuS magnetic nanocomposite still has magnetic properties (Ms = 7.76 emu/g). According to the results of study, in photocatalytic degradation process of PG by CoFe2O4@CuS magnetic nanocomposite by UV light and in optimum condition (pH = 5, nanocomposite dose: 0.2 g/L, PG concentration: 10 mg/L and contact time: 120 min), maximum degradation of PG was 70.7%. Also the photocatalytic reaction almost followed the pseudo-first order kinetics. In addition, after five consecutive runs, the catalyst efficiency wasn't reduced significantly.
关键词： CoFe2O4@CuS,Magnetic nanocomposite,Penicillin G,Antibiotic
更新于2025-09-04 15:30:14
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Combination of CuS and g-C3N4 QDs on upconversion nanoparticles for targeted photothermal and photodynamic cancer therapy
摘要： Combined therapy with multimodal therapeutic agents based on nanomaterials has been shown as a promising approach to cancer treatment. In this report, a highly efficient multifunctional anti-cancer nanocomposite was fabricated by assembling a photothermal agent (CuS nanoparticles) and a photodynamic agent (g-C3N4 quantum dots) on upconversion nanoparticles (UCNPs) after mesoporous silica coating. Then, the surface modification of the obtained nanocomposite (abbreviated as CUSCs) with polyethylene glycol (PEG) and folic acid (FA) endows the final sample (denoted as CUSCs-PEG-FA) with an excellent cancer cell targeting effect and biocompatibility. In this nanoplatform, CuS nanoparticles are an inorganic substance with low toxicity and high photothermal conversion efficiency. g-C3N4 QDs have excellent biocompatibility and are beneficial for cellular uptake due to their small size. UCNPs can be excited by near-infrared (NIR) light to produce ultraviolet and visible (UV-vis) light emission, which overlaps with the UV absorption peak of high fluorescence g-C3N4 quantum dots (QDs). Therefore, when the nanocomposite is excited by 808 nm NIR light, a synergistic treatment effect will be presented. Since the wavelengths absorbed by the chosen photothermal agent and the photosensitizer are different, sufficient utilization of energy can be achieved. Combining photothermal therapy (high photothermal conversion efficiency of 27.4%) and photodynamic therapy can inhibit cancer more effectively compared to any monotherapy. Moreover, as a result of the inherent performance ability of the doped rare earth ions, excellent applicability for computed tomography (CT), upconversion luminescence (UCL) and magnetic resonance imaging (MRI) has been achieved.
关键词： CuS,Upconversion,g-C3N4,Synergistic treatment,Biocompatibility
更新于2025-09-04 15:30:14
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Enhanced Photocatalytic degradation of methylene blue dye using CuS-CdS nanocomposite under visible light irradiation
摘要： The inorganic nanoparticles based semiconductor photocatalyst has attracted widespread attention for the practical applications in sustainable energy and environmental remediation due to its low cost, eco-friendly, high efficiency and ease of process. CuS, CdS and CuS-CdS nanocomposite photocatalysts have been successfully synthesized by a simple hydrothermal approach. The phase purity, composition and surface morphology of as synthesized nanomaterials were characterized using various analytical techniques. The photocatalytic activities of the as-prepared materials have been evaluated by the degradation of methylene blue (MB) dye in the presence of hydrogen peroxide (H2O2) which served as an oxidant under visible light irradiation. MB dye (10 ppm) was degraded by about 80%, 59% and 99.97% for CuS, CdS and CuS-CdS nanocomposite respectively at 10 min. The results demonstrate that CuS-CdS nanocomposite exhibited excellent photocatalytic activity as compared to the CuS and CdS is which mainly attributed to large surface area, narrow band gap, high adsorbing capacity of the dye and also low recombination of the photo-generated electrons and holes. Further, electrochemical impedance (EI) measurement revealed that as prepared CuS-CdS nanocomposite suggested that as compared to CuS and CdS, the CuS-CdS nanocomposite exhibits rapid migration of photo-induced charge carriers. In addition, the CuS-CdS nanocomposite demonstrated that good stability towards photocatalytic degradation even after repeated usage. Finally, a suitable photocatalytic reaction mechanism has been proposed to indicate the photocatalytic performance of the nanocomposite.
关键词： Methylene blue dyes,hydrogen peroxide,CuS-CdS,photocatalytic activity.,charge carrier
更新于2025-09-04 15:30:14