Stark shifts and exciton dissociation in CdSe nanoparticle grafted conjugated polymer

Mehata, Mohan Singh

doi:10.1063/1.3701719

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…Generally, the intensity of absorption increases with increasing pH and a rise in intensity suggests an enhancement in the AgNPs formation with time. [ 12 ] At pH 12, higher intensity was observed and the maximum absorption was 404 nm after 2 and 4 h of reaction time. Therefore, the obtained results confirm that basic pH is more suitable for the synthesis of QE‐AgNPs.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Quercetin‐Assisted Silver Nanoparticles Synthesis and Evaluation of Their Hemocompatibility, Antioxidant, Anti‐Inflammatory, and Antibacterial effects

et al. 2021

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In the present study, different effective parameters (temperature, reaction time, and pH) on the synthesis of quercetin‐assisted silver nanoparticles (QE‐AgNPs) are optimized. These biogenic NPs are characterized by different physico‐chemical analyses, including transmission electron microscopy, X‐ray diffraction, Fourier transform infrared (FTIR) spectroscopy, and UV‐visible spectroscopy. In addition, the biological properties of QE‐AgNPs are evaluated through antioxidant, antimicrobial, anti‐inflammatory, hemolysis, and coagulation time assays. The formation of QE‐AgNPs is affected by different parameters. The optimum condition for the synthesis of QE‐AgNPs is attained at 70 °C and pH 7. Prepared QE‐AgNPs show a spherical shape with a crystalline nature and an average particle size of 20 ± 3.6 nm. The role of QE as a reducing and capping agent in the preparation process of QE‐AgNPs is demonstrated using FTIR analysis. These NPs with excellent antioxidant activity (82.3% at a concentration of 400 µg mL−1) and anti‐inflammatory properties (82.5% and 100% at concentrations of 37.25 and 500 µg mL−1, respectively), show good antimicrobial effects, particularly against Staphylococcus aureus. Furthermore, the results of the hemolytic and coagulation assay of QE‐AgNPs indicate their hemo‐compatibility. Therefore, hemo/bio‐compatible QE‐AgNPs with excellent and unique properties can be employed in different medicinal and pharmacological applications.

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Section: Resultsmentioning

confidence: 99%

Optimization of Quercetin‐Assisted Silver Nanoparticles Synthesis and Evaluation of Their Hemocompatibility, Antioxidant, Anti‐Inflammatory, and Antibacterial effects

et al. 2021

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“…Synthesis of nanoparticles is increasing exponentially because of its wide range of applications in the field of optoelectronics, biosensors, bio-nanotechnology, biomedicine etc. (Bharali, Sahoo, Mozumdar, & Maitra, 2003;Mehata, Majumder, Mallik, & Ohta, 2010;Mehata, 2012Mehata, , 2015Ratnesh & Mehata, 2015;Saxena, Mozumdar, & Johri, 2006;Subbiah, Veerapandian, & Yun, 2010). Various physical and chemical methods have been formulated for the synthesis of nanopartilces of desired shape and size.…”

Section: Introductionmentioning

confidence: 99%

Controllable synthesis of silver nanoparticles using Neem leaves and their antimicrobial activity

Verma

Mehata

2016

Journal of Radiation Research and Applied Sciences

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386

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Silver nanoparticles (AgNPs) were synthesized using aqueous extract of Neem (Azadirachta indica) leaves and silver salt. XRD, SEM, FTIR, optical absorption and photoluminescence (PL) were measured and analysed. The synthesized AgNPs exhibits lowest energy absorption band at 400 nm. The effects of various parameters i.e., extract concentration, reaction pH, reactants ratio, temperature and interaction time on the synthesis of AgNPs were studied. It was found that the formation of AgNPs enhanced with time at higher temperature and alkaline pH. The AgNPs formed were found to have enhanced antimicrobial properties and showed zone of inhibition against isolated bacteria (Escherichia coli) from garden soil sample. Based on the results obtained, it can be concluded that the resources obtained from plants can be efficiently used in the production of AgNPs and could be utilized in various fields such as biomedical, nanotechnology etc.

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“…Thus, the study of CdS nanocrystallites prepared by using different capping ligands opened new avenues to control the size and structure of CdS nanoparticles, which further produces a significant modification in spectroscopic properties. Furthermore, application of an external electric field plays a decisive role in understanding electronic structure and excited-state dynamics of the small size such as nanometer size materials Q-dots as well as large molecules such as polymers and protein 5 7 13 14 15 16 17 18 19 20 21 .…”

mentioning

confidence: 99%

“…The application of an external field to the optical transitions provides important information about the charge-transfer reaction and molecular motion 13 14 15 . This also provides information about the reliability and stability of organic light emitting diode (OLEDs) 20 21 or polymer light emitting diode (PLED) 16 17 , and more efficiently accelerated and decelerated electron transfer processes in molecular systems 14 . It has been observed that the PL of CdS and cadmium telluride (CdTe) nonoparticles is quenched by the application of external electric field, indicating that applied electric field influence the excited-state dynamics of nanomaterials 5 7 18 .…”

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confidence: 99%

Enhancement of Charge Transfer and Quenching of Photoluminescence of Capped CdS Quantum Dots

Mehata

2015

Sci Rep

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Quantum dots (Q-dots) of cadmium sulfide (CdS) with three different capping ligands, 1-butanethiol (BT), 2-mercaptoethanol (ME) and benzyl mercaptan (BM) have been investigated. An external electric field of variable strength of 0.2–1.0 MV cm−1 was applied to the sample of capped CdS Q-dots doped in a poly(methyl methacrylate) (PMMA) films. Field-induced changes in optical absorption of capped CdS Q-dots were observed in terms of purely the second-derivative of the absorption spectrum (the Stark shift), indicating an enhancement in electric dipole moment following transition to the first exciton state. The enhancement depends on the shape and size of the Q-dots prepared using different capping ligands. Field induced-change in photoluminescence (PL) reveals similar changes, an enhancement in charge-transfer (CT) character in exciton state. PL of capped CdS Q-dots is significantly quenched in presence of external electric field. The strong field-induced quenching occurs as a result of the increased charge separation resulting exciton dissociation. Thus, understanding the CT character and field-induced PL quenching of CdS Q-dots is important for photovoltaic, LEDs and biological applications.

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Stark shifts and exciton dissociation in CdSe nanoparticle grafted conjugated polymer

Abstract: Exciton dissociation and charge trapping at poly(3-hexylthiophene)/phenyl-C61-butyric acid methyl ester bulk heterojunction interfaces: Photo-induced threshold voltage shifts in organic field-effect transistors and solar cells

Cited by 13 publications

References 18 publications

Optimization of Quercetin‐Assisted Silver Nanoparticles Synthesis and Evaluation of Their Hemocompatibility, Antioxidant, Anti‐Inflammatory, and Antibacterial effects

Optimization of Quercetin‐Assisted Silver Nanoparticles Synthesis and Evaluation of Their Hemocompatibility, Antioxidant, Anti‐Inflammatory, and Antibacterial effects

Controllable synthesis of silver nanoparticles using Neem leaves and their antimicrobial activity

Enhancement of Charge Transfer and Quenching of Photoluminescence of Capped CdS Quantum Dots

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