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Bityurin N, Sapogova N, Kudryashov A, Pikulin A. Heterogeneous Models for UV Induced Precursor-Mediated Growth of CdS Nanoparticles in PMMA Films: Fitting Experimental Curves and Core-Shell Growth. ACS OMEGA 2024; 9:36648-36658. [PMID: 39220519 PMCID: PMC11359638 DOI: 10.1021/acsomega.4c05121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 07/30/2024] [Accepted: 08/09/2024] [Indexed: 09/04/2024]
Abstract
Experimental data on the absorbance evolution of an UV irradiated PMMA film containing the TEDBCd CdS precursor published earlier are fitted by the authors' recently published model of precursor-mediated heterogeneous nucleation and growth of nanoparticles in polymer films. Two types of nucleation centers are considered. The centers of the first type are nanoparticles initially existing in the material. The centers of the second type belong to polymer chains. The study shows that the experimental data indicate a wide size distribution of the obtained CdS nanoparticles. For the estimated parameter values, the problem of core-shell nanoparticle growth where the nucleation centers of the first type are nanoparticles of a different nature is considered.
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Affiliation(s)
- Nikita Bityurin
- Institute of Applied Physics
of the Russian Academy of Sciences, 46 Ul’yanov Street, 603950 Nizhny Novgorod, Russia
| | - Natalia Sapogova
- Institute of Applied Physics
of the Russian Academy of Sciences, 46 Ul’yanov Street, 603950 Nizhny Novgorod, Russia
| | - Andrey Kudryashov
- Institute of Applied Physics
of the Russian Academy of Sciences, 46 Ul’yanov Street, 603950 Nizhny Novgorod, Russia
| | - Alexander Pikulin
- Institute of Applied Physics
of the Russian Academy of Sciences, 46 Ul’yanov Street, 603950 Nizhny Novgorod, Russia
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2
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Kiczor A, Mergo P. Synthesis of CdSe Quantum Dots in Two Solvents of Different Boiling Points for Polymer Optical Fiber Technology. MATERIALS (BASEL, SWITZERLAND) 2023; 17:227. [PMID: 38204080 PMCID: PMC10779661 DOI: 10.3390/ma17010227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/28/2023] [Accepted: 12/29/2023] [Indexed: 01/12/2024]
Abstract
Polymer materials find many applications in various industries. Efforts are being made to obtain structures with increasingly better properties. It is necessary not only to obtain new materials but also to modify existing structures. Such is the situation with polymer optical fibers. The widespread use of polymer optical fibers is impossible, due to their very high optical losses compared to glass optical fibers. The solution to this problem can be the manufacturing of polymer active optical fibers. Active fibers are the basic components of fiber optic amplifiers and lasers that allow the direct amplification of light inside the fiber. In order for their operation to be the most effective, it is necessary to use dopants. The most commonly used are lanthanide ions isolated from the polymer network, active organic dyes, and quantum dots. These dopants are characterized by very high luminescence and long glow times. Quantum dots of CdSe are made using two organic solvents that differ in boiling points-hexane (a low-boiling solvent with a boiling point of 69 °C) and 1-octadecene (a high-boiling solvent with a boiling point of 315 °C). This work aims to test whether the type of solvent used to obtain quantum dots affects the doping capabilities of polymer structures, from which optical fibers can then be drawn.
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Affiliation(s)
- Anna Kiczor
- Laboratory of Optical Fibers Technology, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, M. Curie-Skłodowska Sq.5, 20-031 Lublin, Poland
| | - Paweł Mergo
- Laboratory of Optical Fibers Technology, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, M. Curie-Skłodowska Sq.5, 20-031 Lublin, Poland
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3
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Antolini F. Direct Optical Patterning of Quantum Dots: One Strategy, Different Chemical Processes. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2008. [PMID: 37446523 DOI: 10.3390/nano13132008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 06/30/2023] [Accepted: 07/03/2023] [Indexed: 07/15/2023]
Abstract
Patterning, stability, and dispersion of the semiconductor quantum dots (scQDs) are three issues strictly interconnected for successful device manufacturing. Recently, several authors adopted direct optical patterning (DOP) as a step forward in photolithography to position the scQDs in a selected area. However, the chemistry behind the stability, dispersion, and patterning has to be carefully integrated to obtain a functional commercial device. This review describes different chemical strategies suitable to stabilize the scQDs both at a single level and as an ensemble. Special attention is paid to those strategies compatible with direct optical patterning (DOP). With the same purpose, the scQDs' dispersion in a matrix was described in terms of the scQD surface ligands' interactions with the matrix itself. The chemical processes behind the DOP are illustrated and discussed for five different approaches, all together considering stability, dispersion, and the patterning itself of the scQDs.
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Affiliation(s)
- Francesco Antolini
- Fusion and Technologies for Nuclear Safety and Security Department, Physical Technology for Safety and Health Division, ENEA C.R. Frascati, Via E. Fermi 45, 00044 Frascati, Italy
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4
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Chauhan PS, Yadav D, Jin JO. The Therapeutic Potential of Algal Nanoparticles: A Brief Review. Comb Chem High Throughput Screen 2022; 25:2443-2451. [PMID: 34477514 DOI: 10.2174/1386207324666210903143832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 07/21/2021] [Accepted: 07/24/2021] [Indexed: 01/27/2023]
Abstract
Recently, the green synthesis of metallic nanoparticles (NPs) has received tremendous attention as a simple approach. The green pathway of biogenic synthesis of metallic NPs through microbes may provide a sustainable and environmentally friendly protocol. Green technology is the most innovative technology for various biological activities and lacks toxic effects. Reports have shown the algae-mediated synthesis of metal NPs. Algae are widely used for biosynthesis as they grow fast; they produce biomass on average ten times that of plants and are easily utilized experimentally. In the future, the production of metal NPs by different microalgae and their biological activity can be explored in diverse areas such as catalysis, medical diagnosis, and anti-biofilm applications.
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Affiliation(s)
| | - Dhananjay Yadav
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan 38541, South Korea
| | - Jun O Jin
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan 38541, South Korea.,Research Institute of Cell Culture, Yeungnam University, Gyeongsan 38541, Korea
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5
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Antolini F, Limosani F, Carcione R. Direct Laser Patterning of CdTe QDs and Their Optical Properties Control through Laser Parameters. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:1551. [PMID: 35564260 PMCID: PMC9103134 DOI: 10.3390/nano12091551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/27/2022] [Accepted: 04/29/2022] [Indexed: 11/18/2022]
Abstract
Direct laser patterning is a potential and powerful technique to localize nanomaterials within a host matrix. The main goal of this study is to demonstrate that by tuning some parameters of a laser source, like power and laser pulse frequency, it is possible to modify and tune the optical properties of the generated quantum dots (QDs) within a host matrix of a specific chemical composition. The study is realized by using cadmium telluride (CdTe) QD precursors, embedded in polymethylmethacrylate (PMMA) host matrix, as starting materials. The patterning of the CdTe QDs is carried out by using a UV nanosecond laser source at 355. Fluorescence microscopy and photoluminescence spectroscopy, associated with transmission electron microscopy, indicate that it is possible to obtain desired patterns of QDs emitting from green to red of the visible spectrum, due to the formed CdTe QDs. Preliminary highlights of the CdTe QDs' formation mechanism are given in terms of laser power and laser pulse frequency (repetition rate).
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Affiliation(s)
- Francesco Antolini
- Fusion and Technologies for Nuclear Safety and Security Department, Physical Technologies for Safety and Health Division, Photonics Micro and Nanostructures Laboratory, ENEA C.R. Frascati, via Enrico Fermi 45, 00044 Frascati (RM), Italy
| | - Francesca Limosani
- Department of Information Engineering, Polytechnic University of Marche, Via Brecce Bianche, 1, 60131 Ancona, Italy;
- INFN-National Laboratories of Frascati, Via Enrico Fermi, 54, 00044 Frascati, Italy
| | - Rocco Carcione
- Consiglio Nazionale delle Ricerche, Institute of Materials for Electronics and Magnetism (CNR-IMEM), Parco Area delle Scienze 37A, 43124 Parma, Italy;
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6
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Bidar N, Darroudi M, Ebrahimzadeh A, Safdari M, de la Guardia M, Baradaran B, Goodarzi V, Oroojalian F, Mokhtarzadeh A. Simultaneous nanocarrier-mediated delivery of siRNAs and chemotherapeutic agents in cancer therapy and diagnosis: Recent advances. Eur J Pharmacol 2022; 915:174639. [PMID: 34919890 DOI: 10.1016/j.ejphar.2021.174639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/30/2021] [Accepted: 11/11/2021] [Indexed: 11/28/2022]
Abstract
Recently, investigations have revealed that RNA interference (RNAi) has a remarkable potential to decrease cancer burden by downregulating genes. Among various RNAi molecules, small interfering RNA (siRNA) has been more attractive for this goal and is able to silence a target pathological path and promote the degradation of a certain mRNA, resulting in either gain or loss of function of proteins. Moreover, therapeutic siRNAs have exhibited low side effects compared to other therapeutic molecular candidates. Nevertheless, siRNA delivery has its own limitations including quick degradation in circulation, ineffective internalization and low passive uptake by cells, possible toxicity against off-target sites, and inducing unfavorable immune responses. Therefore, delivery tools must be able to specifically direct siRNAs to their target locations without inflicting detrimental effects on other sites. To conquer the mentioned problems, nanocarrier-mediated delivery of siRNAs, using inorganic nanoparticles (NPs), polymers, and lipids, has been developed as a biocompatible delivery approach. In this review, we have discussed recent advances in the siRNA delivery methods that employ nanoparticles, lipids, and polymers, as well as the inorganic-based co-delivery systems used to deliver siRNAs and anticancer agents to target cells.
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Affiliation(s)
- Negar Bidar
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Majid Darroudi
- Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Medical Biotechnology and Nanotechnology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ailin Ebrahimzadeh
- Department of Advanced Technologies in Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Mohammadreza Safdari
- Department of Orthopedic Surgery, Faculty of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Miguel de la Guardia
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100, Burjassot, Valencia, Spain
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Vahabodin Goodarzi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Fatemeh Oroojalian
- Department of Advanced Technologies in Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran; Natural Products and Medicinal Plants Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran.
| | - Ahad Mokhtarzadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
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7
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Burns K, Bischoff B, Barr CM, Hattar K, Aitkaliyeva A. Photo-exfoliation of MoS 2quantum dots from nanosheets: an in situtransmission electron microscopy study. NANOTECHNOLOGY 2021; 33:085601. [PMID: 34727536 DOI: 10.1088/1361-6528/ac357c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/02/2021] [Indexed: 06/13/2023]
Abstract
Fabrication of transition metal dichalcogenide quantum dots (QDs) is complex and requires submerging powders in binary solvents and constant tuning of wavelength and pulsed frequency of light to achieve a desired reaction. Instead of liquid state photoexfoliation, we utilize infrared laser irradiation of free-standing MoS2flakes in transmission electron microscope (TEM) to achieve solid-state multi-level photoexfoliation of QDs. By investigating the steps involved in photochemical reaction between the surface of MoS2and the laser beam, we gain insight into each step of the photoexfoliation mechanism and observe high yield production of QDs, led by an inhomogeneous crystalline size distribution. Additionally, by using a laser with a lower energy than the indirect optical transition of bulk MoS2, we conclude that the underlying phenomena behind the photoexfoliation is from multi-photon absorption achieved at high optical outputs from the laser source. These findings provide an environmentally friendly synthesis method to fabricate QDs for potential applications in biomedicine, optoelectronics, and fluorescence sensing.
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Affiliation(s)
- Kory Burns
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, United States of America
- Sandia National Laboratories, PO Box 5800 Albuquerque, NM 87185, United States of America
| | - Benjamin Bischoff
- Sandia National Laboratories, PO Box 5800 Albuquerque, NM 87185, United States of America
- Department of Computer Science, University of Utah, Salt Lake City, UT 84112, United States of America
| | - Christopher M Barr
- Sandia National Laboratories, PO Box 5800 Albuquerque, NM 87185, United States of America
| | - Khalid Hattar
- Sandia National Laboratories, PO Box 5800 Albuquerque, NM 87185, United States of America
| | - Assel Aitkaliyeva
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, United States of America
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8
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Bityurin N, Kudryashov A. Diffusion-assisted ultrashort laser pulse induced photothermal growth of core-shell nanoparticles in polymer matrix. OPTICS EXPRESS 2021; 29:37376-37398. [PMID: 34808811 DOI: 10.1364/oe.439981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/15/2021] [Indexed: 06/13/2023]
Abstract
Light-to-heat conversion that occurs when irradiating a metal nanoparticle within a polymer matrix with ultrashort laser pulses initiates photothermal destruction of dissolved precursor molecules just near the nanoparticle. Extracted elementary species deposit on the nanoparticle surface, forming a core-shell structure. We construct an approximate analytical model for this process. The necessary step here is the diffusion of the precursor molecules towards the nanoparticle surface, replacing the broken ones. This diffusion can be a limiting factor for the rate of the shell growth. However, we show that because of the sharp localization of the process the precursor diffusion can successfully supply the growing shell with elementary species at realistic values of the precursor diffusion coefficient if the sample is kept in viscoelastic state at a temperature near the glass transition between the laser pulses. The main restriction on the obtained shell thickness comes from the requirement of matrix stability during the laser processing. Taking this restriction into account, the model allows estimating reachable shell thicknesses depending on the kinetic parameters of the precursor destruction reaction. This paper relies on numerous publications on photo/laser-induced growth of homogeneous metal or semiconductor nanoparticles within polymer matrices; however, this type of growth for compound core-shell nanoparticles is studied for the first time, to our knowledge.
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9
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Koutavarapu R, Tamtam MR, Rao MC, Peera SG, Shim J. Recent progress in transition metal oxide/sulfide quantum dots-based nanocomposites for the removal of toxic organic pollutants. CHEMOSPHERE 2021; 272:129849. [PMID: 33582511 DOI: 10.1016/j.chemosphere.2021.129849] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 01/06/2021] [Accepted: 01/30/2021] [Indexed: 06/12/2023]
Abstract
Water is an essential solvent that is extremely necessary for the survival of life. Water pollution due to the increased utilization of water for various processes, including domestic and industrial activities, poses a special threat that contaminates both surface and ground water. In recent years, advanced oxidation processes (AOPs) have been applied to deal with wastewater problems, which is a green method used to oxidize organic contaminants with strong oxidative radical species. Among the AOPs, photocatalytic technology is one of the most promising strategies for wastewater cleaning, which fulfills the aims of environmentally friendly and sustainable development. Owing to their unique electronic, optical, and structural properties, nanoscale semiconductors have received substantial interest as materials for AOPs, particularly inspired by their superb quantum confinement effects and large surface-area-to-volume ratio, which are essential for catalytic reaction kinetics. Recent advancements have revealed that semiconductor nanocrystals, known as quantum dots (QDs), are newly emerging zero-dimensional (0-D) nanomaterials, which have garnered much attention owing to their special physiochemical characteristics such as high conductivity, thermo-chemical and opto-mechanical stability, high adsorption coefficients, and, most importantly, their admirable recyclability. In this review, we provide a clear understanding of the importance of semiconductor QD-based nanocomposites in the degradation of organic pollutants, in addition to the mechanism involved in the reaction process. Following this, the enhancement of different materials, such as metal oxides and metal sulfide QD-based nanocomposites, is discussed in the context of combating environmental pollution.
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Affiliation(s)
| | - Mohan Rao Tamtam
- Chemical Engineering Department, Debre Berhan University, Debre Berhan 445, Ethiopia
| | - M C Rao
- Department of Physics, Andhra Loyola College, Vijayawada, 520-008, Andhra Pradesh, India.
| | - Shaik Gouse Peera
- Department of Environmental Science and Engineering, Keimyung University, Daegu, 42602, Republic of Korea.
| | - Jaesool Shim
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712-749, Republic of Korea.
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10
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Development of Quantum Dot (QD) Based Color Converters for Multicolor Display. NANOMATERIALS 2021; 11:nano11051089. [PMID: 33922440 PMCID: PMC8145343 DOI: 10.3390/nano11051089] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 04/09/2021] [Accepted: 04/15/2021] [Indexed: 11/17/2022]
Abstract
Many displays involve the use of color conversion layers. QDs are attractive candidates as color converters because of their easy processability, tuneable optical properties, high photoluminescence quantum yield, and good stability. Here, we show that emissive QDs with narrow emission range can be made in-situ in a polymer matrix, with properties useful for color conversion. This was achieved by blending the blue-emitting pyridine based polymer with a cadmium selenide precursor and baking their films at different temperatures. To achieve efficient color conversion, blend ratio and baking temperature/time were varied. We found that thermal decomposition of the precursor leads to highly emissive QDs whose final size and emission can be controlled using baking temperature/time. The formation of the QDs inside the polymer matrix was confirmed through morphological studies using atomic force microscopy (AFM) and transmission electron microscopy (TEM). Hence, our approach provides a cost-effective route to making highly emissive color converters for multi-color displays.
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11
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Photoinduced nanocomposites based on soluble precursor of CdS nanoparticles in polymethyl methacrylate matrix obtained by bulk radical polymerization. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-020-03193-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Prudnikau A, Shiman DI, Ksendzov E, Harwell J, Bolotina EA, Nikishau PA, Kostjuk SV, Samuel IDW, Lesnyak V. Design of cross-linked polyisobutylene matrix for efficient encapsulation of quantum dots. NANOSCALE ADVANCES 2021; 3:1443-1454. [PMID: 36132870 PMCID: PMC9418506 DOI: 10.1039/d0na01012j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 01/19/2021] [Indexed: 05/08/2023]
Abstract
Photoluminescent quantum dots (QDs) are a prominent example of nanomaterials used in practical applications, especially in light-emitting and light-converting devices. Most of the current applications of QDs require formation of thin films or their incorporation in solid matrices. The choice of an appropriate host material capable of preventing QDs from degradation and developing a process of uniform incorporation of QDs in the matrix have become essential scientific and technological challenges. In this work, we developed a method of uniform incorporation of Cu-Zn-In-S (CZIS) QDs into a highly protective cross-linked polyisobutylene (PIB) matrix with high chemical resistance and low gas permeability. Our approach involves the synthesis of a methacrylate-terminated three-arm star-shaped PIB oligomeric precursor capable of quick formation of a robust 3D polymer network upon exposure to UV-light, as well as the design of a special ligand introducing short PIB chains onto the surface of the QDs, thus providing compatibility with the matrix. The obtained cross-linked QDs-in-polymer composites underwent a complex photostability test in air and under vacuum as well as a chemical stability test. These tests found that CZIS QDs in a cross-linked PIB matrix demonstrated excellent photo- and chemical stability when compared to identical QDs in widely used polyacrylate-based matrices. These results make the composites developed excellent materials for the fabrication of robust, stable and durable transparent light conversion layers.
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Affiliation(s)
- Anatol Prudnikau
- Physical Chemistry, TU Dresden Zellescher Weg 19 01069 Dresden Germany
| | - Dmitriy I Shiman
- Research Institute for Physical Chemical Problems of the Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
| | - Evgenii Ksendzov
- Physical Chemistry, TU Dresden Zellescher Weg 19 01069 Dresden Germany
- Research Institute for Physical Chemical Problems of the Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
| | - Jonathon Harwell
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews North Haugh St Andrews Fife KY16 9SS UK
| | - Ekaterina A Bolotina
- Physical Chemistry, TU Dresden Zellescher Weg 19 01069 Dresden Germany
- Research Institute for Physical Chemical Problems of the Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
- Department of Chemistry, Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
| | - Pavel A Nikishau
- Research Institute for Physical Chemical Problems of the Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
| | - Sergei V Kostjuk
- Research Institute for Physical Chemical Problems of the Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University 119991 Moscow Russia
- Department of Chemistry, Belarusian State University Leningradskaya Str. 14 220006 Minsk Belarus
| | - Ifor D W Samuel
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews North Haugh St Andrews Fife KY16 9SS UK
| | - Vladimir Lesnyak
- Physical Chemistry, TU Dresden Zellescher Weg 19 01069 Dresden Germany
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Cadmium Telluride Nanocomposite Films Formation from Thermal Decomposition of Cadmium Carboxylate Precursor and Their Photoluminescence Shift from Green to Red. CRYSTALS 2021. [DOI: 10.3390/cryst11030253] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study focuses on the investigation of a CdTe quantum dots (QDs) formation from a cadmium-carboxylate precursor, such as cadmium isostearate (Cd(ISA)2), to produce CdTe QDs with tunable photoluminescent (PL) properties. The CdTe QDs are obtained by the thermal decomposition of precursors directly in the polymer matrix (in situ method) or in solution and then encapsulated in the polymer matrix (ex situ method). In both approaches, the time course of the CdTe QDs formation is followed by means of optical absorption and PL spectroscopies focusing on viable emission in the spectral interval between 520 and 630 nm. In the polymeric matrix, the QDs formation is slower than in solution and the PL bands have a higher full width at half maximum (FWHM). These results can be explained on the basis of the limited mobility of atoms and QDs in a solid matrix with respect to the solution, inducing an inhomogeneous growth and the presence of surface defects. These achievements open the way to the exploitation of Cd(ISA)2 as suitable precursor for direct laser patterning (DPL) for the manufacturing of optoelectronic devices.
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