Quantum dots as liquid crystal dopants

Mirzaei, Javad; Reznikov, Mitya; Hegmann, Torsten

doi:10.1039/c2jm33274d

Cited by 182 publications

(97 citation statements)

References 136 publications

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“…56 On the other hand, a number of QDs have been dispersed in various calamitic LCs with the hypothesis that such LC-QD nanocomposites may exhibit mutually beneficial effects on various electro-optical properties. 57 To observe the dispersion of QDs in a DLC, we prepared organicsoluble CdSe QDs of two different sizes, 2.4 and 3.5 nm, and dispersed them in a columnar matrix of hexabutyloxytriphenylene (H4TP) DLC. 58 The synthesized QDs were characterized by transmission electron microscopy (TEM), UV-Vis spectroscopy and photoluminescence spectroscopy.…”

Section: Qds In Discotic Lcsmentioning

confidence: 99%

Discotic liquid crystal-nanoparticle hybrid systems

Kumar

2014

NPG Asia Mater

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Discotic liquid crystals (DLCs) are nanomaterials with sizes ranging from 2 to 6 nm, and they are emerging as one-dimensional organic semiconducting materials. Recently, hybridization of these materials with various metallic and semiconducting nanoparticles (NPs) to alter and improve their properties has been realized. This article provides an overview of the developments in the field of newly immersed discotic nanoscience, a sub-field of liquid crystal (LC) nanoscience. As this field is also of great interest to readers without an LCs background, a brief introduction of the LC field is given first, with special emphasis on DLCs. This is followed by various DLC-NP hybrid systems. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of discotic nanoscience research is provided.

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Section: Qds In Discotic Lcsmentioning

confidence: 99%

Discotic liquid crystal-nanoparticle hybrid systems

Kumar

2014

NPG Asia Mater

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“…В качестве при-мера целесообразно привести два наиболее попу-лярных направления: исследования в области наук о материа лах, направленные на характеризацию и контроль качества наногибридных композитов [4], и биологические исследования, например, для опре-деления объемного распределения флуоресцентных маркеров в живых тканях с измерением наномас-штабной топографии исследуемых объектов [1].…”

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“…As an example, it is reasonable to note two most popular areas: research in the field of materials science aimed at the characterization and quality control of nano-hybrid composites [4], and biological studies, e.g. to determine the spatial distr ibution of fluorescent markers in living tissue with measurement of nanoscale topography of investigated objects [1].…”

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confidence: 99%

Hardware combination of confocal microspectroscopy and 3D scanning probe nano-tomography

Mochalov¹,

Chistyakov²,

Solovyeva³

et al. 2016

NanoRus

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Разработан инструментальный подход к объединению конфокальной микроспектроскопии и 3D сканирующей зондовой нанотомографии в одном устройстве. Такой подход сохраняет все преимущества сканирующей зондовой микроскопии (СЗМ) и оптической микроспектроскопии, позволяя получать многопараметрическую 3D-характеристику с использованием обоих методов. С помощью разработанной системы выполнено коррелятивное исследование 3D-морфологии и флуоресцентных характеристик гибридных фотонных структур с управляемыми флуоресцентными свойствами на основе полимерной сети, легированной полупроводниковыми квантовыми точками. Результаты этой работы могут быть использованы для эффективного преобразования 2D в 3D для большинства методов оптической зондовой наноскопии с высоким разрешением (СБОМ, TERS, АСМ-ИК и др.). Такое преобразование приведет к появлению уникальных методов, способных объединить преимущества СЗМ (наномасштабное измерение морфологии и широкого спектра физических параметров) и оптической микроспектроскопии с пространственным разрешением СЗМ (наномасштабное химическое картирование и определение оптических свойств) при реализации 3D-измерений. Instrumental approach to combination of confocal microspectroscopy and the 3D scanning probe nano-tomography in a single device is developed. This approach retains all the advantages of scanning probe microscopy (SPM) and optical microspectroscopy, allowing to obtain multi-parametric 3D characteristic using both methods. Using the developed system a correlation study of 3D morphology and fluorescence of hybrid photonic structures with controlled fluorescent properties based on polymer networks, alloyed by semiconductor quantum dots is executed. The results of this project can be used for effective 2D to 3D conversion for most of the methods of optical probe high resolution nanoscopy (SNOM, TERS, AFM-IR etc.). Such a transformation will lead to the development of unique methods that can combine the advantages of SPM (nano-scale measurement of the morphology and a wide range of physical parameters) and optical microspectroscopy with a spatial resolution of SPM (nano-scale chemical mapping and determining the optical properties) in 3D measurements.т рехмерный наномасштабный корреляцион-ный анализ оптических, спектральных и мор-фологических свойств объектов эффективен при исследовании внутренней структуры и элементного анализа различных нанокомпозитов, полупрово-дниковых наноматериалов и устройств на их основе,

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“…Among the main lines of research in this field, noteworthy are the development of techniques for highly homogeneous aligned distribution of QDs in different organic matrices [5][6][7][8][9] , designing of light conversion devices [10][11][12] , and sensing approaches 13,14 . Significant efforts have been made to engineer hybrid nanophotonic materials from different types of liquid crystals and QDs 15,16 . Our research group has taken part in the development of photonic devices with photo-and electrically controlled fluorescent properties based on cholesteric liquid crystal matrices doped with CdSe/ZnS semiconductor fluorescent QDs [17][18][19] , as well as the development of the techniques for characterization of polymer matrix-QD hybrid systems 20 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Optical Properties of Composites Consisting of Nanoporous Stretched Polypropylene Doped with Liquid Crystals and Quantum Dots at a High Concentration

Mochalov¹,

Bobrovsky²,

Solovyeva³

et al. 2016

Orient. J. Chem

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Unique properties of nanohybrid composites based on different types of porous polymer matrices doped with fluorescent nanoparticles (quantum dots, QDs) are determined by the combination of the mechanical properties of the host matrix (flexibility, chemical stability, etc.) and a high luminescence intensity and extreme stability of QDs. Here, we report on the preparation, optical and microstructural characterization of a nanoporous stretched polypropylene matrix embedded with CdSe/ZnS QDs as fluorescent dopants at a high concentration. The microstructure and optical properties of two types films based on QD-polymer composites and liquid crystals are described. The distribution of QDs in the composite films and their morphology was determined. The annealing of the nanoporous composite films leads to shrinking of the pores and encapsulation of QDs, which results in a domain-like structure. The resulting flexible, stable and highly luminescent materials may be applied to obtain the highly luminescent diodes, the light converter devices and the display systems.

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Quantum dots as liquid crystal dopants

Cited by 182 publications

References 136 publications

Discotic liquid crystal-nanoparticle hybrid systems

Discotic liquid crystal-nanoparticle hybrid systems

Hardware combination of confocal microspectroscopy and 3D scanning probe nano-tomography

Microstructure and Optical Properties of Composites Consisting of Nanoporous Stretched Polypropylene Doped with Liquid Crystals and Quantum Dots at a High Concentration

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