Photophysical Properties of Multilayer Graphene-Quantum Dots Hybrid Structures.

Ivan Reznik,Roman Zakoldaev,Mikhail Baranov,Andrey Veniaminov,Andrey Zlatov,Anna Orlova,Stanislav Moshkalev

doi:10.3390/nano10040714

Ivan Reznik, Roman Zakoldaev + Show 5 more

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https://doi.org/10.3390/nano10040714

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Journal: Nanomaterials	Publication Date: Apr 9, 2020
Citations: 5	License type: CC BY 4.0

Affiliation: ITMO University, Universidade Estadual de Campinas

Abstract

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.

Highlights

Quantum semiconductor nanocrystals (NCs) are among the most popular and fast-evolving species in current research [1]
We describe the influence of external irradiation on photoluminescence and photoelectric properties of multilayer graphene–quantum dots (QDs) (MLG–QD) hybrid structures deposited onto titanium contacts
The optical properties of QDs stabilized with oleic acid (OA) molecules and PL properties, and the morphology of QD monolayers on dielectric slides and in MLG–QD hybrid structures were studied using FTIR (Figure S1a), steady-state UV and PL spectroscopy (Figure S1b, SEM (Figure S2), Atomic Force Microscopy (AFM) (Figure S3), and Laser Scanning Microscopy (LSM) (Figure S4) techniques

Summary

Introduction

Quantum semiconductor nanocrystals (NCs) (i.e., crystals confined to a few nanometers in one, two, or three dimensions) are among the most popular and fast-evolving species in current research [1]. Despite the increasing number of nanostructured materials that are newly synthesized each year, their practical application has, been very limited to date [7,8,9]. Some of the vivid examples of such materials are 0D semiconductor nanocrystals, referred to as quantum dots (QDs) [10,11]. QD utilization in industry is restricted to the creation of high-performance LEDs and lasers [12,13]; QDs appear to be superior in many practical applications, such as environmental monitoring, sensorics, solar energy utilization, biology, and medicine [14,15,16]

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