Charge recombination suppression in dye-sensitized solar cells by tuning the dielectric constant of triphenylamine dyes with altering π-bridges from naphthalene to anthracene units

Chenab, Karim Khanmohammadi; Zamani-Meymian, Mohammad-Reza; Qashqay, Samaneh Mahmoudi

doi:10.1039/d2cp02744e

Cited by 3 publications

(1 citation statement)

References 62 publications

(91 reference statements)

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“…Among these methods, magnetron sputtering has been shown in several studies to be a suitable and feasible way to modify antibacterial coatings 56 – 58 . This method offers an excellent opportunity to produce homogeneous, smooth, and dense coatings with a rapid deposition rate, thereby increasing the coating-substrate adherence 59 , 60 . Additionally, multicomponent composite layers can be formed with precise control of the component concentrations by the magnetron co-sputtering 61 – 65 .…”

Section: Introductionmentioning

confidence: 99%

Improving antibacterial ability of Ti-Cu thin films with co-sputtering method

Mahmoudi-Qashqay,

Zamani-Meymian,

Sadati

2023

Sci Rep

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Due to the resistance of some bacteria to antibiotics, research in the field of dealing with bacterial infections is necessary. A practical approach utilized in this study involves the preparation of an antibacterial thin film on the surfaces, which can effectively inhibit and reduce biofilm formation and bacterial adherence. In this study, we report the fabrication of bactericidal titanium (Ti) and copper (Cu) surfaces which involves a powerful co-sputtering method. This method provides a situation in which constituent elements are deposited simultaneously to control the composition of the thin film. Prepared samples were examined by energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM), and contact angle measurements. To evaluate antibacterial behavior, we used two bacterial strains Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus). Antibacterial activity of the prepared sample was assessed by determining the number of colony-forming units per milliliter (CFU/ml) using a standard viable cell count assay. Results indicated that as the Cu concentration increased, the nanoscale surfaces became rougher, with roughness values rising from 11.85 to 49.65 nm, and the contact angle increased from 40 to 80 degrees, indicating a hydrophilic character. These factors play a significant role in the antibacterial properties of the surface. The Ti-Cu films displayed superior antibacterial ability, with a 99.9% reduction (equivalent to a 5-log reduction) in bacterial viability after 2 h compared to Ti alone against both bacterial strains. Field emission scanning electron microscopy (FE-SEM) images verified that both E. coli and S. aureus cells were physically deformed and damaged the bacterial cell ultrastructure was observed. These findings highlight that adding Cu to Ti can improve the antibacterial ability of the surface while inhibiting bacterial adherence. Therefore, the Ti14-Cu86 sample with the highest percentage of Cu had the best bactericidal rate. Investigation of toxicity of Cu-Ti thin films was conducted the using the MTT assay, which revealed their biocompatibility and absence of cytotoxicity, further confirming their potential as promising biomaterials for various applications.

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Section: Introductionmentioning

confidence: 99%

Improving antibacterial ability of Ti-Cu thin films with co-sputtering method

Mahmoudi-Qashqay,

Zamani-Meymian,

Sadati

2023

Sci Rep

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Molecular Screening of Different π-Linker-Based Organic Dyes for Optoelectronic Applications: Quantum Chemical Study

Arunkumar

Ragavan

Munusamy

et al. 2023

J. Electron. Mater.

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A Simple Method for Fabrication of Hybrid Electrodes of Supercapacitors

Qashqay,

Meymian,

Maleki

2024

Preprint

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The increasing need for electrode materials exhibiting improved performance to meet the requirements of supercapacitors is on the rise. Hybrid electrodes, which combine reduced graphene (RGO) oxide with transition metal-based oxides such as cobalt oxide (CoO), have emerged as promising materials due to their impressive specific capacitance and cost-effectiveness, attributed to their synergistic properties. In the present study, a binder-free RGOCoO composite electrode was synthesized using a facile, fast, and simple one-step co-precipitation method. This was done to improve stability for supercapacitor applications. The synthesized composite materials underwent comprehensive characterization utilizing various surface analytical techniques, including X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), field-emission scanning electron microscopy (FE-SEM), fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analysis. Electrochemical measurements of the fabricated hybrid revealed at current density of 2 A cm− 2 a specific capacitance of 132.3 mF cm− 2, with an impressive 95.91% retention of capacitance after 7000 cycles. The results from electrochemical impedance spectroscopy (EIS) highlighted a meager low relaxation time constant of 0.53 s for the electrode. The reason behind this can be linked to the synergistic interactions, and minimal charge transfer resistance exhibited by the porous electrode without binders. The innovative simple synthesis of a binder-free RGOCoO composite electrode represents a significant advancement in the development of high-efficiency supercapacitors for diverse large-scale applications.

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Charge recombination suppression in dye-sensitized solar cells by tuning the dielectric constant of triphenylamine dyes with altering π-bridges from naphthalene to anthracene units

Abstract: Charge recombination reactions (CRRs) are responsible for a major contribution of power conversion efficiency (PCE) loss in dye-sensitized solar cells (DSSCs). This study tracks the impact of the dielectric constant...

Cited by 3 publications

References 62 publications

Improving antibacterial ability of Ti-Cu thin films with co-sputtering method

Improving antibacterial ability of Ti-Cu thin films with co-sputtering method

Molecular Screening of Different π-Linker-Based Organic Dyes for Optoelectronic Applications: Quantum Chemical Study

A Simple Method for Fabrication of Hybrid Electrodes of Supercapacitors

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