Hybrid structures based on quantum dots and graphene nanobelts

Reznik, Ivan A.; Gromova, Yulia; Zlatov, A. S.; Baranov, M. A.; Орлова, А. О.; Moshkalev, Stanislav A.; Маслов, В. Г.; Баранов, А. В.; Fedorov, Anatoly V.

doi:10.1134/s0030400x17010258

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…A schematic representation of various radiative and nonradiative relaxation pathways of the excited state in QDs for a MLG-QD hybrid structure system is shown in Figure 2. Analysis of the characteristic PL lifetimes and amplitudes of the QD PL components has shown that QDs in both PL fractions are strongly quenched in MLG-QD structures due to efficient charge or energy transfer from QDs to MLG [43][44][45]. Due to the fact that the characteristic amplitudes correlate with the quantity of luminescent QDs and the observed decrease in PL amplitude by almost two orders of magnitude (from~1300 to~50 counts, according to inset table in Figure 1), we can suppose that we detected the luminesce signal only from approximately 3-4% in the whole QD ensemble.…”

Section: Pl Kinetics Of Cdse Qds In Mlg-qd Structuresmentioning

confidence: 99%

Photophysical Properties of Multilayer Graphene–Quantum Dots Hybrid Structures

et al. 2020

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Photoelectrical and photoluminescent properties of multilayer graphene (MLG)–quantum dots (QD) hybrid structures have been studied. It has been shown that the average rate of transfer from QDs to the MLG can be estimated via photoinduced processes on the QDs’ surfaces. A monolayer of CdSe QDs can double the photoresponse amplitude of multilayer graphene, without influencing its characteristic photoresponse time. It has been found that efficient charge or energy transfer from QDs to MLG with a rate higher than 3 × 108 s−1 strongly inhibits photoinduced processes on the QD surfaces and provides photostability for QD-based structures.

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Section: Pl Kinetics Of Cdse Qds In Mlg-qd Structuresmentioning

confidence: 99%

Photophysical Properties of Multilayer Graphene–Quantum Dots Hybrid Structures

et al. 2020

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“…5, для оболочечных CdSe/ZnS КТ во всех фракциях наблюдается симбатное сокращение характерных времен затухания люминесценции при переходе от раствора к слоям на диэлектрической подложке и графеновых нанолент. Наблюдаемое изменение люминесцентных свойств КТ является типичным и свидетельствует об увеличении взаимодействия КТ−КТ в сухих слоях и об эффективном взаимодействии сухого слоя КТ со слоем графеновых нанолент [17]. Следует отметить, что в структурах CdSe НК с графеном может быть реализован как эффективный перенос энергии по механизму FRET [18], так и фотоиндуцированный перенос заряда [19].…”

Section: материалы и методыunclassified

Люминесцентные И Фотоэлектрические Свойства Гибридных Структур На Основе Многослойного Графена И 0D И 2D Полупроводниковых Квантовых Нанокристаллов

Резник¹,

Златов²,

Ильин³

et al. 2020

Журнал Технической Физики

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Establishing the laws of the mechanisms underlying the interaction of nanostructured materials is one of the most important tasks on the way to creating a new generation of efficient photovoltaic devices. In this paper, we study the luminescent and photoelectric properties of hybrid structures formed on the basis of multilayer graphene nanobelts and semiconductor quantum nanocrystals: 0D-: core-shell CdSe / ZnS quantum dots, and 2D-: CdSe nanoplatelets. It was shown that the multiexponential decay of the excitonic luminescence of CdSe nanoplates at room temperature originates from the delayed luminescence due to the presence of trap states on the surface of the nanoplates. It has been established that in the dry layers of nanoplatelets on a dielectric substrate and in the composition of hybrid structures with graphene nanoribbons, the efficiency of delayed excitonic luminescence of nanoplates increases. It has been demonstrated that the rate of increase in photoconductivity in hybrid structures based on CdSe nanoplatelets is an order of magnitude higher than the rate of this process in similar structures based on CdSe / ZnS quantum dots, which indicates the formation of an effective energy / charge transfer channel from nanoplatelets to graphene nanoribbons.

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“…These properties make Gr an ideal candidate for the Gr-based electrochemical sensors, electronic sensors, optical sensors, and nanopore sensors for biological or chemical detection. 59 Novel nanostructures of Gr including nanobelts, 60 nanoflakes, nanoribbons, and nanodots are emerging as interesting alternatives to conventional Gr. 61 Gr nanobelts were synthesized from natural graphite.…”

Section: Graphene-based Sensing and Medical Applicationsmentioning

confidence: 99%

Graphene and Graphene Analogs toward Optical, Electronic, Spintronic, Green-Chemical, Energy-Material, Sensing, and Medical Applications

Rezapour

Myung

Yun

et al. 2017

ACS Appl. Mater. Interfaces

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This spotlight discusses intriguing properties and diverse applications of graphene (Gr) and Gr analogs. Gr has brought us two-dimensional (2D) chemistry with its exotic 2D features of density of states. Yet, some of the 2D or 2D-like features can be seen on surfaces and at interfaces of bulk materials. The substrate on Gr and functionalization of Gr (including metal decoration, intercalation, doping, and hybridization) modify the unique 2D features of Gr. Despite abundant literature on physical properties and well-known applications of Gr, spotlight works based on the conceptual understanding of the 2D physical and chemical nature of Gr toward vast-ranging applications are hardly found. Here we focus on applications of Gr, based on conceptual understanding of 2D phenomena toward 2D chemistry. Thus, 2D features, defects, edges, and substrate effects of Gr are discussed first. Then, to pattern Gr electronic circuits, insight into differentiating conducting and nonconducting regions is introduced. By utilizing the unique ballistic electron transport properties and edge spin states of Gr, Gr nanoribbons (GNRs) are exploited for the design of ultrasensitive molecular sensing electronic devices (including molecular fingerprinting) and spintronic devices. The highly stable nature of Gr can be utilized for protection of corrosive metals, moisture-sensitive perovskite solar cells, and highly environment-susceptible topological insulators (TIs). Gr analogs have become new types of 2D materials having novel features such as half-metals, TIs, and nonlinear optical properties. The key insights into the functionalized Gr hybrid materials lead to the applications for not only energy storage and electrochemical catalysis, green chemistry, and electronic/spintronic devices but also biosensing and medical applications. All these topics are discussed here with the focus on conceptual understanding. Further possible applications of Gr, GNRs, and Gr analogs are also addressed in a section on outlook and future challenges.

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Hybrid structures based on quantum dots and graphene nanobelts

Cited by 9 publications

References 16 publications

Photophysical Properties of Multilayer Graphene–Quantum Dots Hybrid Structures

Photophysical Properties of Multilayer Graphene–Quantum Dots Hybrid Structures

Люминесцентные И Фотоэлектрические Свойства Гибридных Структур На Основе Многослойного Графена И 0D И 2D Полупроводниковых Квантовых Нанокристаллов

Graphene and Graphene Analogs toward Optical, Electronic, Spintronic, Green-Chemical, Energy-Material, Sensing, and Medical Applications

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