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Articles de revues sur le sujet « Semiconductor Nanoparticles/Quantum Dots »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Himadri, D., D. Pranayee et S. Kandarpa Kumar. « Synthesis of PbS Nanoparticles and Its Potential as a Biosensor based on Memristic Properties ». Volume 4,Issue 5,2018 4, no 5 (14 septembre 2018) : 500–502. http://dx.doi.org/10.30799/jnst.147.18040510.

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Quantum dots are nearly spherical nanocrystals that have unique optical property which are in intermediate in size between bulk semiconductor and individual atom. Lead sulphide (PbS) nanoparticles are synthesized by the reaction between lead nitrate and sodium sulphide. This paper proposes a detection method of bacterial sample based on memristic properties of semiconductor quantum dots. In this case, PbS nanoparticle is considered for its good fluorescent property. PbS nanoparticle were synthesized and characterized by UV –visible spectroscopy, PL, XRD, SEM and HRTEM. The antimicrobial activity of Pbs and CdS quantum dots are observed in this paper. The potential application of these quantum dots as a biosensor is examined by conjugating bacterial stain E. coli and S. aureus and examining the current –voltage characteristics with E. coli.
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2

Barachevsky, V. A. « Photochromic quantum dots ». Izvestiya vysshikh uchebnykh zavedenii. Fizika, no 11 (2021) : 30–44. http://dx.doi.org/10.17223/00213411/64/11/30.

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The analysis of the results of fundamental and applied research in the field of creation of photochromic nanoparticles of the "core-shell" type, in which semiconductor nanocrystals - quantum dots were used as a core, and the shell included physically or chemically sorbed molecules of photochromic thermally relaxing (spiropyrans, spirooxazines , chromenes, azo compounds) or thermally irreversible (diarylethenes, fulgimides) compounds. It has been shown that such nanoparticles provide reversible modulation of the QD radiation intensity, which can be used in information and biomedical technologies.
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Yuan, Dekai, Ping Wang, Liju Yang, Jesse L. Quimby et Ya-Ping Sun. « Carbon “quantum” dots for bioapplications ». Experimental Biology and Medicine 247, no 4 (3 décembre 2021) : 300–309. http://dx.doi.org/10.1177/15353702211057513.

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Carbon “quantum” dots or carbon dots (CDots) exploit and enhance the intrinsic photoexcited state properties and processes of small carbon nanoparticles via effective nanoparticle surface passivation by chemical functionalization with organic species. The optical properties and photoinduced redox characteristics of CDots are competitive to those of established conventional semiconductor quantum dots and also fullerenes and other carbon nanomaterials. Highlighted here are major advances in the exploration of CDots for their serving as high-performance yet nontoxic fluorescence probes for one- and multi-photon bioimaging in vitro and in vivo, and for their uniquely potent antimicrobial function to inactivate effectively and efficiently some of the toughest bacterial pathogens and viruses under visible/natural or ambient light conditions. Opportunities and challenges in the further development of the CDots platform and related technologies are discussed.
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Lin, Cheng-An J., Tim Liedl, Ralph A. Sperling, María T. Fernández-Argüelles, Jose M. Costa-Fernández, Rosario Pereiro, Alfredo Sanz-Medel, Walter H. Chang et Wolfgang J. Parak. « Bioanalytics and biolabeling with semiconductor nanoparticles (quantum dots) ». J. Mater. Chem. 17, no 14 (2007) : 1343–46. http://dx.doi.org/10.1039/b618902d.

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Bertino, M. F., R. R. Gadipalli, J. G. Story, C. G. Williams, G. Zhang, C. Sotiriou-Leventis, A. T. Tokuhiro, S. Guha et N. Leventis. « Laser writing of semiconductor nanoparticles and quantum dots ». Applied Physics Letters 85, no 24 (13 décembre 2004) : 6007–9. http://dx.doi.org/10.1063/1.1836000.

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Doskaliuk, Natalia, Yuliana Lukan et Yuriy Khalavka. « Quantum dots for temperature sensing ». Scientiae Radices 2, no 1 (23 mars 2023) : 69–87. http://dx.doi.org/10.58332/scirad2023v2i1a04.

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Quantum dots are three-dimensional nanoparticles of semiconductors with typical sizes ranging from 2 to 10 nm. Due to the quantum confinement effect the energy gap increase with the size decreasing resulting in size-depended and fine-tunable optical characteristics. Besides this, the energy structure of a quantum dot with a certain size is highly sensitive to environmental conditions. These specific properties open a wide range of applications starting from optical and optoelectronic devices and ending with biosensing and life science. Temperature is one of those parameters influencing strongly on the optical properties of semiconductor nanocrystals, which make them promising materials for temperature sensing, more often using a fluorescent response. Compared to the conventional organic dyes already applied in this field, quantum dots exhibit a set of advantages, such as high quantum yield and photostability, long fluorescence lifetime, higher Stokes shift, and ability to surface functionalization with targeted organic molecules aimed to provide them biocompatibility. In this review, we briefly discuss the properties of II-VI and assumingly less toxic I-III-VI quantum dots, mechanisms of temperature-induced fluorescence response, and the feasibility of their practical application in the field of thermal sensing.
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Doskaliuk, Natalia, Yuliana Lukan et Yuriy Khalavka. « Quantum dots for temperature sensing. » Scientiae Radices 2, no 2 (19 avril 2023) : 93–111. http://dx.doi.org/10.58332/scirad2023v2i2a01.

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Quantum dots are three-dimensional nanoparticles of semiconductors with typical sizes ranging from 2 to 10 nm. Due to the quantum confinement effect the energy gap increase with the size decreasing resulting in size-depended and fine-tunable optical characteristics. Besides this, the energy structure of a quantum dot with a certain size is highly sensitive to environmental conditions. These specific properties open a wide range of applications starting from optical and optoelectronic devices and ending with biosensing and life science. Temperature is one of those parameters influencing strongly on the optical properties of semiconductor nanocrystals, which make them promising materials for temperature sensing, more often using a fluorescent response. Compared to the conventional organic dyes already applied in this field, quantum dots exhibit a set of advantages, such as high quantum yield and photostability, long fluorescence lifetime, higher Stokes shift, and ability to surface functionalization with targeted organic molecules aimed to provide them biocompatibility. In this review, we briefly discuss the properties of II-VI and assumingly less toxic I-III-VI quantum dots, mechanisms of temperature-induced fluorescence response, and the feasibility of their practical application in the field of thermal sensing.
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8

MAHMOOD, Iram, Ishfaq AHMAD, Ishaq AHMAD et Ting-kai ZHAO. « Photodegradation of Melamine Using Magnetic Silicon Quantum Dots ». Materials Science 27, no 2 (5 mai 2021) : 127–32. http://dx.doi.org/10.5755/j02.ms.22688.

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Semiconductor Silicon quantum dots (SiQDs) and magnetic nanomaterials have been studied extensively for their variety of applications. We have presented a new method for the preparation of Magnetic Silicon Quantum Dots (Fe3O4/SiQDs) heterostructure nanocomposites. These nanocomposites are fluorescent, have excellent magnetic properties as well as high photocatalytic activity. Magnetic nanoparticles-semiconductor nanocomposites served as an effective recoverable photocatalyst for melamine degradation. In addition, due to their easy magnetic separation, these nanocomposites showed optimum catalytic activity for 15 cycles of usage.
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Косарев, А. Н., В. В. Чалдышев, А. А. Кондиков, Т. А. Вартанян, Н. А. Торопов, И. А. Гладских, П. В. Гладских et al. « Эпитаксиальные квантовые точки InGaAs в матрице Al-=SUB=-0.29-=/SUB=-Ga-=SUB=-0.71-=/SUB=-As : интенсивность и кинетика люминесценции в ближнем поле серебряных наночастиц ». Журнал технической физики 126, no 5 (2019) : 573. http://dx.doi.org/10.21883/os.2019.05.47655.382-18.

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AbstractQuantum dots of indium gallium arsenide buried in a thin layer of aluminum gallium arsenide were grown by means of molecular-beam epitaxy. The influence of silver nanoparticles grown on the surface of the semiconductor structure by vacuum thermal evaporation on photoluminescence of quantum dots was investigated. Photoluminescence spectra of quantum dots were obtained under stationary and pulsed excitation. The influence of silver nanoparticles exhibiting plasmon resonances on spectral distribution and kinetics of luminescence of the epitaxial quantum dots was studied.
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Jooken, Stijn, Yovan de Coene, Olivier Deschaume, Dániel Zámbó, Tangi Aubert, Zeger Hens, Dirk Dorfs et al. « Enhanced electric field sensitivity of quantum dot/rod two-photon fluorescence and its relevance for cell transmembrane voltage imaging ». Nanophotonics 10, no 9 (21 mai 2021) : 2407–20. http://dx.doi.org/10.1515/nanoph-2021-0077.

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Abstract The optoelectronic properties of semiconductor nanoparticles make them valuable candidates for the long-term monitoring of transmembrane electric fields in excitable cells. In this work, we show that the electric field sensitivity of the fluorescence intensity of type-I and quasi-type-II quantum dots and quantum rods is enhanced under two-photon excitation compared to single-photon excitation. Based on the superior electric field sensitivity of the two-photon excited fluorescence, we demonstrate the ability of quantum dots and rods to track fast switching E-fields. These findings indicate the potential of semiconductor nanoparticles as cellular voltage probes in multiphoton imaging.
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Kumar, Jatish, K. George Thomas et Luis M. Liz-Marzán. « Nanoscale chirality in metal and semiconductor nanoparticles ». Chemical Communications 52, no 85 (2016) : 12555–69. http://dx.doi.org/10.1039/c6cc05613j.

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Liang, Yuantong, Chenguang Lu, Defang Ding, Man Zhao, Dawei Wang, Chao Hu, Jieshan Qiu, Gang Xie et Zhiyong Tang. « Capping nanoparticles with graphene quantum dots for enhanced thermoelectric performance ». Chemical Science 6, no 7 (2015) : 4103–8. http://dx.doi.org/10.1039/c5sc00910c.

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The general capability of graphene quantum dots to serve as capping ligands exchanging native organic stabilizers for various types of semiconductor nanoparticles affords the opportunity to engineer functional nanocomposites with remarkable thermoelectric properties.
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13

Lobnik, Aleksandra, Špela Korent Urek et Matejka Turel. « Quantum Dots Based Optical Sensors ». Defect and Diffusion Forum 326-328 (avril 2012) : 682–89. http://dx.doi.org/10.4028/www.scientific.net/ddf.326-328.682.

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Luminescent sensors are chemical systems that can deliver information on the presence of selected analytes through the variations in their luminescence emission. With the advent of luminescent nanoparticles several new applications in the field of chemical sensing were explored. Among them, quantum dots (QD) represent inorganic semiconductor nanocrystals that are advantageous over conventional organic dyes from many different points of view. In this short review, the optical detection of various analytes using QD-based probes/sensors is presented and significant sensors characteristics are discussed. The biosensing approaches are not included in this article.
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14

Grieve, Karen, Paul Mulvaney et Franz Grieser. « Synthesis and electronic properties of semiconductor nanoparticles/quantum dots ». Current Opinion in Colloid & ; Interface Science 5, no 1-2 (mars 2000) : 168–72. http://dx.doi.org/10.1016/s1359-0294(00)00050-9.

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Fabregat, Víctor, M. Isabel Burguete, Santiago V. Luis et Francisco Galindo. « Improving photocatalytic oxygenation mediated by polymer supported photosensitizers using semiconductor quantum dots as ‘light antennas’ ». RSC Advances 7, no 56 (2017) : 35154–58. http://dx.doi.org/10.1039/c7ra06036j.

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Geißler, D., M. Wegmann, T. Jochum, V. Somma, M. Sowa, J. Scholz, E. Fröhlich et al. « An automatable platform for genotoxicity testing of nanomaterials based on the fluorometric γ-H2AX assay reveals no genotoxicity of properly surface-shielded cadmium-based quantum dots ». Nanoscale 11, no 28 (2019) : 13458–68. http://dx.doi.org/10.1039/c9nr01021a.

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The genotoxic potential of citrate-stabilized gold nanoparticles, micellar encapsulated iron oxide nanoparticles, and cadmium-based semiconductor quantum dots with different shell compositions was tested using the automated microscope system AKLIDES.
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Wei, Lin, Peng Zhou, Qingxiu Yang, Qiaoyu Yang, Ming Ma, Bo Chen et Lehui Xiao. « Fabrication of bright and small size semiconducting polymer nanoparticles for cellular labelling and single particle tracking ». Nanoscale 6, no 19 (2014) : 11351–58. http://dx.doi.org/10.1039/c4nr03293d.

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In this work, we demonstrate a convenient and robust strategy for efficient fabrication of high fluorescence quantum yield (QY, 49.8 ± 3%) semiconducting polymer nanoparticles (SPNs), with size comparable with semiconductor quantum dots (Qdots).
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DUBROVSKY, TIM. « SEMICONDUCTOR NANOPARTICLES AS REPORTERS IN MULTIPLEXED IMMUNOASSAY AND CELL ANALYSIS ». International Journal of Nanoscience 08, no 01n02 (février 2009) : 163–67. http://dx.doi.org/10.1142/s0219581x09005657.

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The development of new fluorophores has experienced a tremendous advance over the last two decades. Here, we discuss the photophysical properties of traditional fluorescent labels and the comparatively advantageous properties of quantum dots. The unique spectral properties of quantum dots, such as their large Stokes shifts and exceptional brightness, make them attractive probes in biological applications and prime candidates for further research and development in the field of solid-phase immunoassay and cell analysis.
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Guryev, Evgenii L., Samah Shanwar, Andrei Vasilevich Zvyagin, Sergey M. Deyev et Irina V. Balalaeva. « Photoluminescent Nanomaterials for Medical Biotechnology ». Acta Naturae 13, no 2 (27 juillet 2021) : 16–31. http://dx.doi.org/10.32607/actanaturae.11180.

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Creation of various photoluminescent nanomaterials has significantly expanded the arsenal of approaches used in modern biomedicine. Their unique photophysical properties can significantly improve the sensitivity and specificity of diagnostic methods, increase therapy effectiveness, and make a theranostic approach to treatment possible through the application of nanoparticle conjugates with functional macromolecules. The most widely used nanomaterials to date are semiconductor quantum dots; gold nanoclusters; carbon dots; nanodiamonds; semiconductor porous silicon; and up-conversion nanoparticles. This paper considers the promising groups of photoluminescent nanomaterials that can be used in medical biotechnology: in particular, for devising agents for optical diagnostic methods, sensorics, and various types of therapy.
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Tvrdy, Kevin, Pavel A. Frantsuzov et Prashant V. Kamat. « Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles ». Proceedings of the National Academy of Sciences 108, no 1 (13 décembre 2010) : 29–34. http://dx.doi.org/10.1073/pnas.1011972107.

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Quantum dot-metal oxide junctions are an integral part of next-generation solar cells, light emitting diodes, and nanostructured electronic arrays. Here we present a comprehensive examination of electron transfer at these junctions, using a series of CdSe quantum dot donors (sizes 2.8, 3.3, 4.0, and 4.2 nm in diameter) and metal oxide nanoparticle acceptors (SnO2, TiO2, and ZnO). Apparent electron transfer rate constants showed strong dependence on change in system free energy, exhibiting a sharp rise at small driving forces followed by a modest rise further away from the characteristic reorganization energy. The observed trend mimics the predicted behavior of electron transfer from a single quantum state to a continuum of electron accepting states, such as those present in the conduction band of a metal oxide nanoparticle. In contrast with dye-sensitized metal oxide electron transfer studies, our systems did not exhibit unthermalized hot-electron injection due to relatively large ratios of electron cooling rate to electron transfer rate. To investigate the implications of these findings in photovoltaic cells, quantum dot-metal oxide working electrodes were constructed in an identical fashion to the films used for the electron transfer portion of the study. Interestingly, the films which exhibited the fastest electron transfer rates (SnO2) were not the same as those which showed the highest photocurrent (TiO2). These findings suggest that, in addition to electron transfer at the quantum dot-metal oxide interface, other electron transfer reactions play key roles in the determination of overall device efficiency.
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Mattsson, Leena, K. David Wegner, Niko Hildebrandt et Tero Soukka. « Upconverting nanoparticle to quantum dot FRET for homogeneous double-nano biosensors ». RSC Advances 5, no 18 (2015) : 13270–77. http://dx.doi.org/10.1039/c5ra00397k.

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The unique photophysical properties of upconverting nanoparticles (UCNPs) and semiconductor quantum dots (QDs) render them an attractive donor–acceptor combination for near-infrared (NIR) excited FRET-based optical biosensing.
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Leigh, Kenton, Jennifer Bouldin et Roger Buchanan. « Effects of Exposure to Semiconductor Nanoparticles on Aquatic Organisms ». Journal of Toxicology 2012 (2012) : 1–9. http://dx.doi.org/10.1155/2012/397657.

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Because of their unique physical, optical, and mechanical properties, nanomaterials hold great promise in improving on a wide variety of current technologies. Consequently, their use in research and consumer products is increasing rapidly, and contamination of the environment with various nanomaterials seems inevitable. Because surface waters receive pollutants and contaminants from many sources including nanoparticles and act as reservoirs and conduits for many environmental contaminants, understanding the potential impacts of nanoparticles on the organisms within these environments is critical to evaluating their potential toxicity. While there is much to be learned about interactions between nanomaterials and aquatic systems, there have been a number of recent reports of interactions of quantum dots (QDs) with aquatic environments and aquatic organisms. This review is focused on providing a summary of recent work investigating the impacts of quantum dots on aquatic organisms.
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Panigrahy, Bharati, Prasanta Kumar Sahoo et Bibhuti Bhusan Sahoo. « Construction of CdSe–AuPd quantum dot 0D/0D hybrid photocatalysts : charge transfer dynamic study with electrochemical analysis for improved photocatalytic activity ». Dalton Transactions 51, no 2 (2022) : 664–74. http://dx.doi.org/10.1039/d1dt02761a.

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The integration of semiconductor quantum dots and noble metal nanoparticles can efficiently couple numerous effects corresponding to the individual domains of the hybrid system for a variety of applications.
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Shesterikov, Alexander, Sergei Karpov et Mikhail Gubin. « Entangled plasmon generation in nonlinear spaser systems ». EPJ Web of Conferences 190 (2018) : 03003. http://dx.doi.org/10.1051/epjconf/201819003003.

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The work is focused on the investigation of features of quantum dynamics for localized plasmons in spaser systems consisting of metal nanoparticles (NP) and semiconductor quantum dots (QDs). The non-classical plasmon states generation in a three-particle spaser system with nonlinear plasmon-exciton interaction is predicted.
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Gubin, Mikhail, et Alexei Prokhorov. « Formation of non-classical optical states in spaser systems under control of an external magnetic field ». EPJ Web of Conferences 220 (2019) : 03017. http://dx.doi.org/10.1051/epjconf/201922003017.

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The work is focused on the investigation of features of quantum dynamics for photons in spaser systems consisting of metal nanoparticles (NP) and semiconductor quantum dots (QDs). The non-classical photon states generation in a three-particle spaser system with nonlinear plasmon-exciton interaction is predicted.
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Самохвалов, П. С., Д. О. Володин, С. В. Бозрова, Д. С. Довженко, М. А. Звайгзне, П. А. Линьков, Г. О. Нифонтова, И. О. Петрова, А. В. Суханова et И. Р. Набиев. « Преобразование полупроводниковых наночастиц в плазмонные материалы путем направленной замены органических лигандов, связанных с их поверхностью ». Письма в журнал технической физики 45, no 7 (2019) : 11. http://dx.doi.org/10.21883/pjtf.2019.07.47528.17631.

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AbstractPlasmonic nanoparticles have become a popularly accepted research tool in optoelectronics, photonics, and biomedical applications. The relatively recently appearing semiconductor plasmonic nanoparticles, as opposed to metal ones, are characterized by infrared plasmonic optical transitions and their application has a great future. In this work, the possibility of conversion of semiconductor (excitonic) fluorescence nanocrystals, i.e., quantum dots of the CuInS_2 composition, to plasmonic nanoparticles by postsynthetic treatment without changes in the chemical composition of inorganic part of the nanocrystals was demonstrated for the first time ever.
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Tsvetkova, Olga Yu, Sergey N. Shtykov, Nikolay D. Zhukov et Tatiana D. Smirnova. « Synthesis and study of some properties of colloidal quantum dots of indium antimonide ». Izvestiya of Saratov University. Chemistry. Biology. Ecology 21, no 4 (16 décembre 2021) : 378–81. http://dx.doi.org/10.18500/1816-9775-2021-21-4-378-381.

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Colloidal quantum dots of indium antimonide have been synthesized by a known technique. The shape and average diameters of quantum dots have been investigated by transmission electron microscopy using a transmission microscope. Controlling the size and shape of colloidal QDs provides information on the formation of the crystal structure of nanoparticles and their possible physical and optical properties. It has been found that InSb quantum dots are characterized by a polygonal shape. The results obtained for QDs correspond to the crystal lattice system of a semiconductor with a cubic crystal lattice structure. Elemental analysis of nanoparticles has been monitored by X-ray microanalysis. The experimental determination error was no more than one percent. The percentages of indium and antimony in QDs according to X-ray microanalysis data corresponded to the theoretical stoichiometry In: Sb = 1:1. Impurities of other elements constituted the level of trace amounts, which confirmed the chemical purity of the synthesized InSb QDs. The fluorescent properties of indium antimonide nanoparticles have been studied. It has been found that the luminescence intensity of InSb nanoparticles at room temperature is insignificant, which is in agreement with the literature data. The quantum yield does not exceed 1%, and the luminescence maximum lies in the range of 1040 nm.
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Banerjee, Anusuya, Thomas Pons, Nicolas Lequeux et Benoit Dubertret. « Quantum dots–DNA bioconjugates : synthesis to applications ». Interface Focus 6, no 6 (6 décembre 2016) : 20160064. http://dx.doi.org/10.1098/rsfs.2016.0064.

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Semiconductor nanoparticles particularly quantum dots (QDs) are interesting alternatives to organic fluorophores for a range of applications such as biosensing, imaging and therapeutics. Addition of a programmable scaffold such as DNA to QDs further expands the scope and applicability of these hybrid nanomaterials in biology. In this review, the most important stages of preparation of QD–DNA conjugates for specific applications in biology are discussed. Special emphasis is laid on (i) the most successful strategies to disperse QDs in aqueous media, (ii) the range of different conjugation with detailed discussion about specific merits and demerits in each case, and (iii) typical applications of these conjugates in the context of biology.
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Bansal, Ashu K., Muhammad T. Sajjad, Francesco Antolini, Lenuta Stroea, Paulius Gečys, Gediminas Raciukaitis, Pascal André et al. « In situ formation and photo patterning of emissive quantum dots in small organic molecules ». Nanoscale 7, no 25 (2015) : 11163–72. http://dx.doi.org/10.1039/c5nr01401h.

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Basché, Thomas. « Imaging and force transduction in correlative scanning force and confocal fluorescence microscopy ». EPJ Web of Conferences 190 (2018) : 02002. http://dx.doi.org/10.1051/epjconf/201819002002.

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Correlative scanning force and confocal fluorescence microscopy has been used to study individual molecules, nanoparticles and nanoparticle oligomers. By applying a compressive force via the AFM cantilever, spectral blue and red shifts in the range of several meV/GPa have been observed for single dye molecules and semiconductor quantum dots. Moreover, individual Au nanoparticle dimers linked by a chlorophyll binding protein have been imaged in both modes and plasmonic fluorescence enhancement of the chlorophyll emission of up to a factor of 15 has been found.
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V. Pillai, Karthik, Patrick J. Gray, Chun-Chieh Tien, Reiner Bleher, Li-Piin Sung et Timothy V. Duncan. « Environmental release of core–shell semiconductor nanocrystals from free-standing polymer nanocomposite films ». Environmental Science : Nano 3, no 3 (2016) : 657–69. http://dx.doi.org/10.1039/c6en00064a.

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Prodanov, Maksym, Maksym Diakov et Valerii Vashchenko. « A facile non-injection phosphorus-free synthesis of semiconductor nanoparticles using new selenium precursors ». CrystEngComm 22, no 4 (2020) : 786–93. http://dx.doi.org/10.1039/c9ce01467e.

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Sharma, Horrick, et Somrita Mondal. « Functionalized Graphene Oxide for Chemotherapeutic Drug Delivery and Cancer Treatment : A Promising Material in Nanomedicine ». International Journal of Molecular Sciences 21, no 17 (30 août 2020) : 6280. http://dx.doi.org/10.3390/ijms21176280.

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The usage of nanomaterials for cancer treatment has been a popular research focus over the past decade. Nanomaterials, including polymeric nanomaterials, metal nanoparticles, semiconductor quantum dots, and carbon-based nanomaterials such as graphene oxide (GO), have been used for cancer cell imaging, chemotherapeutic drug targeting, chemotherapy, photothermal therapy, and photodynamic therapy. In this review, we discuss the concept of targeted nanoparticles in cancer therapy and summarize the in vivo biocompatibility of graphene-based nanomaterials. Specifically, we discuss in detail the chemistry and properties of GO and provide a comprehensive review of functionalized GO and GO–metal nanoparticle composites in nanomedicine involving anticancer drug delivery and cancer treatment.
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F, I. s. h. a. n. k. u. l. o. v. A., T. u. r. s. u. n. o. v. a. N. R, E. r. g. a. s. h. e. v. a. D. R, K. h. a. l. i. l. o. v. K. F, G. a. l. y. a. m. e. t. d. i. n. o. v. Y. u. G et M. u. k. h. a. m. a. d. i. e. v. N. K. « OBTAINING SEMICONDUCTOR CdS, CdSe AND CdSe/ZnS CORE/SHELL NANOPARTICLES AND THEIR COMPOSITES WITH POLYMERS ». 2022-yil, 3-son (133/1) ANIQ FANLAR SERIYASI 1, no 1 (20 février 2023) : 1–5. http://dx.doi.org/10.59251/2181-1296.v1.1.1863.

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In this work, high-performance CdS, CdSe and CdSe/ZnS nanocrystals with good luminescence were colloidally synthesized at high temperature and incorporated into micrometer-sized polymethylmethacrylate (PMMA) spheres formed by suspension polymerization reaction. CdS, CdSe and CdSe/ZnS quantum dots obtained by the colloid method were stabilized with oleic acid and their optical properties were studied. It was observed that the intensity peaks of quantum dots did not change after modification to PMMA polymer.
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F, I. s. h. a. n. k. u. l. o. v. A., T. u. r. s. u. n. o. v. a. N. R, E. r. g. a. s. h. e. v. a. D. R, K. h. a. l. i. l. o. v. K. F, G. a. l. y. a. m. e. t. d. i. n. o. v. Y. u. G et M. u. k. h. a. m. a. d. i. e. v. N. K. « OBTAINING SEMICONDUCTOR CdS, CdSe AND CdSe/ZnS CORE/SHELL NANOPARTICLES AND THEIR COMPOSITES WITH POLYMERS ». 2022-yil, 3-son (133/1) ANIQ FANLAR SERIYASI 1, no 1 (20 février 2023) : 1–5. http://dx.doi.org/10.59251/2181-1296.2023.v1.1.1863.

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In this work, high-performance CdS, CdSe and CdSe/ZnS nanocrystals with good luminescence were colloidally synthesized at high temperature and incorporated into micrometer-sized polymethylmethacrylate (PMMA) spheres formed by suspension polymerization reaction. CdS, CdSe and CdSe/ZnS quantum dots obtained by the colloid method were stabilized with oleic acid and their optical properties were studied. It was observed that the intensity peaks of quantum dots did not change after modification to PMMA polymer.
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Radchanka, Aliaksandra V., Tatiana I. Terpinskaya, Tatsiana L. Yanchanka, Tatjana V. Balashevich et Mikhail V. Artemyev. « Influence of calcium ions on physical chemical characteristics of semiconductor quantum dots encapsulated by amphiphilic polymer and their efficiency of cellular uptake ». Journal of the Belarusian State University. Chemistry, no 2 (25 août 2020) : 3–16. http://dx.doi.org/10.33581/2520-257x-2020-2-3-16.

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Here, we studied the effect of calcium ions on the physicochemical properties and cellular uptake of CdSe/ZnS quantum dots encapsulated with poly(maleic anhydride-alt-1-tetradecene), modified to a varying extent by quaternary ammonium groups. It was shown that quantum dots carrying negatively charged carboxyl groups in the polymer shell change their physicochemical and optical characteristics in the presence of Ca2+ and Ba2+ ions. As the negatively charged carboxyl groups in the shell are completely replaced by positively charged quaternary ammonium groups, these effects gradually decrease. A change in the physicochemical properties of nanoparticles leads to a change in their cellular uptake in the presence of calcium ions. Nanoparticles carrying only negatively charged groups in the shell in the presence of Ca2+ agglomerate and form conglomerates of nanoparticles and cells. The positively charged quaternary ammonium groups in the polymer shell of the nanoparticles increase their aggregative stability in the presence of Ca2+ and contribute to their uptake by cells. The mechanisms of uptake depend on nanoparticle’s charge. Nanoparticles with a positive ζ potential are absorbed by calcium-dependent mechanisms, which are suppressed by inhibition of the calcium-dependent enzyme dynamin or in the presence of calcium chelator EGTA. The uptake of nanoparticles with a negative ζ potential, in contrast, is enhanced by the chelation of calcium ions. This indicates the different role of cellular calcium-dependent mechanisms in the uptake of positively and negatively charged nanoparticles.
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Hickey, Stephen G. « The Photoelectrochemistry of Assemblies of Semiconductor Nanoparticles at Interfaces ». Zeitschrift für Physikalische Chemie 232, no 9-11 (28 août 2018) : 1567–82. http://dx.doi.org/10.1515/zpch-2018-1178.

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Abstract The application of photoelectrochemical methods presents the researcher with a powerful set of versatile tools by which photoactive materials, such as semiconductor quantum dots, at conductive interfaces may be interrogated. While the range of photoelectrochemical techniques available is quite large, it is surprising that very few have found their way into common usage within the nanoparticle community. Here a number of photoelectrochemical techniques and the principles upon which they are based are introduced. A short discussion on the criticality of ensuring the nanoparticles are reliably anchored to the substrate is followed by an introduction to the basic set of equipment required in order to enable the investigator to undertake such experiments. Subsequently the four techniques of transient photocurrent response to square wave illumination, photocurrent spectroscopy, intensity modulated photocurrent spectroscopy and intensity modulated photovoltage spectroscopy are introduced. Finally, the information that can be acquired using such techniques is provided with emphasis being placed on a number of case studies exemplifying the application of photoelectrochemical techniques to nanoparticles at interfaces, in particular optically transparent electrodes.
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Biju, Vasudevanpillai, Tamitake Itoh, Abdulaziz Anas, Athiyanathil Sujith et Mitsuru Ishikawa. « Semiconductor quantum dots and metal nanoparticles : syntheses, optical properties, and biological applications ». Analytical and Bioanalytical Chemistry 391, no 7 (12 juin 2008) : 2469–95. http://dx.doi.org/10.1007/s00216-008-2185-7.

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Prajapati, K. N., Ben Johns, K. Bandopadhyay, S. Ravi P. Silva et J. Mitra. « Interaction of ZnO nanorods with plasmonic metal nanoparticles and semiconductor quantum dots ». Journal of Chemical Physics 152, no 6 (14 février 2020) : 064704. http://dx.doi.org/10.1063/1.5138944.

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Hobler, Christian, Udo Bakowsky et Michael Keusgen. « A functional immobilization of semiconductor nanoparticles (quantum dots) on nanoporous aluminium oxide ». physica status solidi (a) 207, no 4 (29 mars 2010) : 872–77. http://dx.doi.org/10.1002/pssa.200983313.

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Bao, Nguyen Thi Thanh, et Dinh Van Trung. « Development of a fluorescence correlation spectroscopy instrument and its application in sizing quantum dot nanoparticles ». Communications in Physics 25, no 1 (21 avril 2015) : 59. http://dx.doi.org/10.15625/0868-3166/25/1/5670.

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Fluorescence correlation spectroscopy is a relatively new technique to measure and quantify the statistical fluctuations of the fluorescence signal from the measurement volume. Combining with sensitive detection method and confocal microscopy, the FCS technique has become a powerful tool in studying the dynamic properties of nanoparticles at single particle level. In this paper we present the construction of a highly sensitive FCS instrument and the measurement results from a sample of semiconductor quantum dots. We provide the analysis procedure for determining the hydrodynamic radius of the quantum dots and compare the results with that obtained directly from electron microscope imaging. The good agreement indicates the reliability of the FCS technique and open the way for further applications of this technique in studying nanoparticles.
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Mohamed, Walied A. A., Hala Abd El-Gawad, Saleh Mekkey, Hoda Galal, Hala Handal, Hanan Mousa et Ammar Labib. « Quantum dots synthetization and future prospect applications ». Nanotechnology Reviews 10, no 1 (1 janvier 2021) : 1926–40. http://dx.doi.org/10.1515/ntrev-2021-0118.

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Abstract Quantum dots (QDs) are nanocrystals of a semiconductor material that exist in a size regime less than 10 nm. QDs have become promising nanoparticles for a wide variety of different applications. However, the major drawback of QDs is their potential toxicity. This review reports on some recent methods for the synthesis of QDs and explores their properties, structures, applications, and toxicity. QDs are extraordinary because their minute size produces a physically confined electron cloud, an effect known as the quantum confinement. Certainly, because of their special properties as they had a great unique optical, electronic, and chemical properties that were not observe in other materials. These unique properties of the QD are an attractive material for a variety of scientific and commercial applications, most of them recently been realized, such as biosensors, bioimaging, photodetectors, displays, solar cells, wastewater treatment, and quantum computers. Finally, but not the end, an interesting potential QD application in future perspectives will expect as light-emitting diode products, biomedical applications, and Li-Fi.
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Wang, Yanli, Parambath Anilkumar, Li Cao, Jia-Hui Liu, Pengju G. Luo, Kenneth N. Tackett, Sushant Sahu, Ping Wang, Xin Wang et Ya-Ping Sun. « Carbon dots of different composition and surface functionalization : cytotoxicity issues relevant to fluorescence cell imaging ». Experimental Biology and Medicine 236, no 11 (novembre 2011) : 1231–38. http://dx.doi.org/10.1258/ebm.2011.011132.

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Nanoscale carbon particles have emerged as versatile precursors for a new class of highly fluorescent nanomaterials that resemble semiconductor quantum dots. The surface-passivated fluorescent carbon nanoparticles, dubbed ‘carbon dots’, were already demonstrated for their potential optical bioimaging applications in vitro and in vivo. In this study, we conducted a systematic cytotoxicity evaluation on the carbon dots prepared by various combinations of precursor carbon nanoparticles and molecules for the particle surface functionalization. The results suggested that the cytotoxicity of carbon dots was dependent on the selection of surface passivation molecules. Those dots showing more significant cytotoxicity at higher concentrations were also evaluated for their effects on the fluorescence imaging of live cells. The implications of the results on the eventual use of carbon dots as cell imaging agents are discussed.
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Wacaser, Brent A., Kimberly A. Dick, Zeila Zanolli, Anders Gustafsson, Knut Deppert et Lars Samuelson. « Size-selected compound semiconductor quantum dots by nanoparticle conversion ». Nanotechnology 18, no 10 (6 février 2007) : 105306. http://dx.doi.org/10.1088/0957-4484/18/10/105306.

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Galyametdinov, Yuriy G., Dmitriy O. Sagdeev, Andrey A. Sukhanov, Violeta K. Voronkova et Radik R. Shamilov. « Monitoring of the Mechanism of Mn Ions Incorporation into Quantum Dots by Optical and EPR Spectroscopy ». Photonics 6, no 4 (19 octobre 2019) : 107. http://dx.doi.org/10.3390/photonics6040107.

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Synthesis of nanoparticles doped with various ions can significantly expand their functionality. The conditions of synthesis exert significant influence on the distribution nature of doped ions and therefore the physicochemical properties of nanoparticles. In this paper, a correlation between the conditions of synthesis of manganese-containing cadmium sulfide or zinc sulfide nanoparticles and their optical and magnetic properties is analyzed. Electron paramagnetic resonance was used to study the distribution of manganese ions in nanoparticles and the intensity of interaction between them depending on the conditions of synthesis of nanoparticles, the concentration of manganese, and the type of initial semiconductor. The increase of manganese concentration is shown to result in the formation of smaller CdS-based nanoparticles. Luminescent properties of nanoparticles were studied. The 580 nm peak, which is typical for manganese ions, becomes more distinguished with the increase of their concentration and the time of synthesis.
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Li, Zhijie, Guofeng Zhang, Bin Li, Ruiyun Chen, Chengbing Qin, Yan Gao, Liantuan Xiao et Suotang Jia. « Enhanced biexciton emission from single quantum dots encased in N-type semiconductor nanoparticles ». Applied Physics Letters 111, no 15 (9 octobre 2017) : 153106. http://dx.doi.org/10.1063/1.4989605.

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Kim, Hyungki, Michael V. Tran, Eleonora Petryayeva, Olga Solodova, Kimihiro Susumu, Eunkeu Oh, Igor L. Medintz et W. Russ Algar. « Affinity Immobilization of Semiconductor Quantum Dots and Metal Nanoparticles on Cellulose Paper Substrates ». ACS Applied Materials & ; Interfaces 12, no 47 (12 novembre 2020) : 53462–74. http://dx.doi.org/10.1021/acsami.0c14559.

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Kurochkina, Margarita, Elena Konshina, Aleksandr Oseev et Soeren Hirsch. « Hybrid structures based on gold nanoparticles and semiconductor quantum dots for biosensor applications ». Nanotechnology, Science and Applications Volume 11 (avril 2018) : 15–21. http://dx.doi.org/10.2147/nsa.s155045.

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Bahshi, Lily, Ronit Freeman, Ron Gill et Itamar Willner. « Optical Detection of Glucose by Means of Metal Nanoparticles or Semiconductor Quantum Dots ». Small 5, no 6 (20 mars 2009) : 676–80. http://dx.doi.org/10.1002/smll.200801403.

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Lee, Yuhan, Haeshin Lee, Phillip B. Messersmith et Tae Gwan Park. « A Bioinspired Polymeric Template for 1D Assembly of Metallic Nanoparticles, Semiconductor Quantum Dots, and Magnetic Nanoparticles ». Macromolecular Rapid Communications 31, no 24 (21 octobre 2010) : 2109–14. http://dx.doi.org/10.1002/marc.201000423.

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