Dong Ick Son

Dong Ick Son
Korea Institute of Science and Technology | KIST · Institute of Advanced Composite Materials

Ph D

About

111
Publications
17,068
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3,201
Citations
Citations since 2016
39 Research Items
1891 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300

Publications

Publications (111)
Article
Carbon nanotube buckypaper has been considered as one of the promising candidates for chemiresistive sensor applications, especially with environmental monitoring purpose due to large surface area, device flexibility, and the broad spectrum of responsive chemical vapor molecules. However, one of typical drawbacks in carbon-based sensors is incomple...
Article
Boron nitride nanotubes (BNNTs) are eco-friendly and lightweight materials with various physical, chemical, piezoelectric and mechanical properties. In particular, their exceptional properties can be exploited for piezoelectric applications. However, it remains a great challenge to improve the efficiency of the piezoelectric properties in the radia...
Article
We demonstrated the sensing properties and adsorption mechanism of NO2 molecules of monolayer graphene and multilayer graphene encapsulated ZnO QDs for NO2 gas adsorption. The gas response value of ZnO-multilayer graphene (ZMLG) QDs was approximately 23 % and 7.2 and 25.5 times higher than that with ZnO-monolayer graphene (ZG) and ZnO QDs, respecti...
Article
The characteristics of a flexible write-once-read-many-times (WORM) memory fabricated with monolayered 0-dimensional (0D) CdSe–ZnS quantum dots (QDs) layers sandwiched between two insulating 2-dimensional (2D) hexagonal boron nitride (hBN) multilayers were investigated by electrical measurement method. The hBN/QDs monolayer/hBN structure was fabric...
Article
We demonstrated the thermally robust reduced graphene oxide (rGO)/boron nitride nanotube (BNNT) papers and their application in electromagnetic interference shielding. In order to overcome the thermal durability shortcomings of electromagnetic wave shielding paper based on rGO nanomaterial, rGO/BNNT electromagnetic interference (EMI) shielding pape...
Article
Arranging carbon, boron, and nitrogen atoms in a sp² network can give rise to tunable electronic properties from insulators (h-BN) to metals (graphene). For semiconductor applications, the construction of a ternary structure (h-BxCyNz) is highly desirable, but its uniform and large-area synthesis has remained a great challenge. This challenge has b...
Article
Transition metal oxide has been attracting significant attention as a potential alternative anode materials for high-performance lithium-ion batteries. However, the materials still suffer from poor performance due to the large volume expansion during reversible electrochemical reaction between the materials and Li ions. Here, we report on successfu...
Article
Cocrystal formation due to a combination between 4Cl-cHBC and bulk heterojunction for improving the efficiency. The power conversion efficiency of a device using the 4Cl-cHBC additives is 9.46%, which is 20.6% higher than that of a reference device.
Article
Layered transition metal dichalcogenide (TMD) crystals in reduced dimensions have exhibited a wide range of extraordinary physical and chemical properties spanning from exotic quantum phenomenon to unusually superior chemical reactivity. Their anisotropic van der Waals (vdW) bonding nature enables them to commonly possess two-dimensional (2D) struc...
Article
Full-text available
The aggregation of zinc oxide nanoparticles leads to an increased absorbance in the ultraviolet-visible region by an induced light scattering effect. Herein, we demonstrate the inhibition of photoconversion activity in ZnO-graphene core-shell quantum dots (QD) (ZGQDs) agglomerated by 4-aminophenol (4-AP) used as a linker. The ZnO-graphene quantum d...
Article
Environmentally friendly metal oxide quantum dots (QDs) nanostructures has become attractive alternative materials for replacing QDs containing toxic elements of Cd and Pb. Although many attempts have been proposed for optoelectronic applications of hybrid metal oxide QDs with tailored opto-electronic properties, the fabrication of heterogeneous QD...
Article
We report the fabrication of hybridization between graphene quantum dots (GQDs) and ZnO nanoflowers (NFs) for mediating photoluminescence by using a straightforward solution-based technique. Hydrothermally grown two-dimensional ZnO NFs played an essential role in assembling GQDs. The large surface area to volume ratio of ZnO NFs led to a highly den...
Article
The tungsten oxide nonvolatile memory devices were fabricated using the photothermal in-situ oxidation method. The photothermal in-situ oxidation method can monitor the oxidation process in real time. Raman spectra revealed that tungsten oxides were formed by thermal oxidation. The ON/OFF ratio of the current bistability for the device was as large...
Article
We demonstrate the use of CdSe quantum dots (QDs) as an interlayer for improving photovoltaic performance in the inverted polymer solar cells (iPSCs). The conjugation of CdSe and [email protected] [email protected] QDs between polyethylenimine ethoxylated (PEIE) polymer and PTB7:PC71BM blended layer played an important role in increasing the short...
Article
Benefited from a large density of layer edges exposed on the surface, vertically-aligned two-dimensional (2D) molybdenum disulfide (MoS2) layers have recently harvested excellent performances in the field of electrochemical catalysis and chemical sensing. With their increasing versatility for high-temperature demanding applications, it is vital to...
Article
We have developed a new and versatile three-dimensional (3D) porous and the conductive carbon spun fabric (CSF) structure and applied it to the current collector for advanced lithium-ion batteries (LIBs). The 3D porous CSF are manufactured from recycled oxidized polyacrylonitrile (Oxi-PAN) staple fibers via the spinning, the knitting, stabilization...
Article
We demonstrate the [email protected] [email protected] quantum dot (ZGQDs) fabricated by selectively engineering of oxygenated functional groups on the graphene shells with eco-friendly keratin textile for transparent and flexible UV photodetector devices. The ZGQDs with the octylamine (ZGQDs-OA) and the graphene sheet were employed as an active ma...
Article
Herein, we demonstrate that two-dimensional (2D) CdSeS quantum dot monolayer (QDM) can be strongly influenced by the efficient charge transport and charge separation on improving performance of inverted polymer solar cells (iPSCs). Also, we firstly report an electronic band structure of CdSeS and CdSeS@ZnS QDs and a noble approach to apply the 2D Q...
Article
Full-text available
A new way to simultaneously grow carbon nanotubes (CNTs) and ultrathin graphite on copper (Cu) foils has been investigated. This one-step growth process yields three-dimensional networks of CNTs on graphitic layers (3D CNTs/G) on Cu foils. Their synthesis conditions and growth mechanism are discussed in detail taking their structural properties int...
Article
Molybdenum disulfide (MoS2) has been extensively used as a hole transport layer in many inverted polymer solar cell devices. However, its potential as an electron transport layer in a solar cell device has rarely been reported. In this paper, we demonstrate an iPSC with enhanced photovoltaic performance by the introduction of a MoS2 nanosheet (NS)...
Article
Potassium doped titanium oxide (KTiO x ) nanowires were prepared by the wet corrosion process (WCP) and their photocatalytic effects were systematically characterized. For the synthesis of KTiO x , the potassium hydroxide concentration of the WCP was varied in order to obtain nanostructures with different surface area and surface charge. Structural...
Article
We demonstrate the fabrication of highly transparent, electroconductive durable, and eco-friendly nanofibers (NFs) textiles based on Keratin using electro-conductive silver nanowire networks on transparent nano-fibrous substrates for multifunctional, high-performance flexible heaters. This NF-based textile, including keratin, has a high transparenc...
Article
Multilayered graphene is grown on copper (Cu) wires by chemical vapor deposition. Mechanical, chemical, thermal and electrical performances are investigated as a function of growth conditions. The graphene layer which makes a volume of approximately 0.02% of the Cu wire enables a 28–37% improvement on tensile strength and strain-to-failure. The che...
Article
Hybrid organic-Red-Green-Blue (RGB) color quantum dots were incorporated into consolidated p(polymer)–i(RGB quantum dots)–n(small molecules) junction structures to fabricate a single active layer for a light emitting diode device for white electroluminescence. The semiconductor RGB quantum dots, as an intrinsic material, were electrostatically bond...
Conference Paper
ZnO-Graphene conjugated thin films were prepared using spin coating technique for different spin rates. Prior to the deposition, ZnO-Graphene nanoparticles were synthesized and their particle size and conjugation was studied through Transmission electron microscope (TEM). The deposited films were characterized using grazing incidence x-ray diffract...
Article
We report the synthesis and characterization of the carbon quantum dots (C-dots) easily obtained from citric acid and ethanediamine, and also investigated structural, optical and electrical properties. The C-dots have extraordinary optical and electrical features such as absorption of ultraviolet range and effective interface for charge separation...
Article
We report on the in-situ chemical growth of unique core-shell quantum dots (QDs) with single layer graphene on the surfaces of the Mn3O4 QDs and on their structural, optical and electrical properties. The Mn3O4-graphene QDs were synthesized through a simple hydrothermal technique. In order to enhance performance for electrochemical energy storage,...
Article
In this paper, we report the synthesis and characterization of carbon quantum dots that were easily obtained from citric acid and ethanediamine. The synthesized carbon quantum dots (QDs) had various wavelengths and improved electron extraction. We fabricated photovoltaic cells based on these QDs-integrated in polymer nanocomposite used as an interl...
Article
We report on the in-situ chemical growth of unique core-shell quantum dots (QDs) with single layer graphene on the surface of CuO QDs and their structural, optical and electrical properties. The CuO/graphene QDs were synthesized through a simple and hydrothermal technique. In order to enhance performance electrochemical energy storages, we have dev...
Article
Transparent human hair-based textiles, which are founded on a natural resource, have been fabricated by an electrospinning technique. Transparent human hair-based textiles are very useful for transparent wearable electronics because they have unique optical properties in the visible light region such as transparency of over ∼85%. In order to apply...
Article
This work reports on the in-situ chemical synthesis and their properties of the core (active material)/shell (conductive material) type Co3O4/graphene quantum dots (QDs). The stable oxygen bridge bonds between the Co3O4 core and the oxygen-related functional groups on the graphene shells facilitate the efficient charge/discharge performance. The ef...
Article
The electronic structure of ZnO core-C60 shell (ZnO@C60) quantum dots (QDs) was investigated with the help of model interface analysis between ZnO QDs and C60 using in situ ultraviolet and X-ray photoelectron spectroscopy measurements. To form the ZnO QDs/C60 interface in situ, a vacuum-integrated electrospray deposition technique was employed to s...
Article
Full-text available
Well-dispersed MnO2 micro-flowers were grown directly on carbon nanofibers via a simple hydrothermal technique without any template. Structure and morphology were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) equipped with rapid energy dispersive analysis X-ray (EDX). The appealed characterization...
Article
Optoelectronic devices with dual-function consisting of LEDs and OBDs, both containing ZnO QDs dispersed in a hybrid poly N-vinylcarbazole (PVK) and polymethylmethacrylate (PMMA) polymer layer, were fabricated on indium-tin-oxide (ITO)-coated glass substrates using a simple spin-coating technique. Transmission electron microscopy images showed that...
Article
We report the successful conjugation of carbon nanomaterials on the surface of ZnO quantum dots (QDs) and vice versa. The synthesis of ZnO QDs and carbon nanomaterial composites was achieved using a mild solution-process method, which resulted in fast photoinduced charge separation. The conjugation of the ZnO QDs to the multi-walled carbon nanotube...
Article
Electrospinning used to fabricate eco-friendly, transparent, human hair-based nanofibers (NFs) using natural resources such as keratin (which is found in hair, wool, feather, nails, and horns). These NF-based textiles are very useful in making transparent, wearable electronics, as they possess unique optical properties in the visible light regions,...
Article
Full-text available
Lead sulfide (PbS) quantum dots (QDs) have great potential in optoelectronic applications because of their desirable characteristics as a light absorber for near-infrared (NIR) photodetection. However, most PbS-based NIR photodetectors are two-terminal devices, which require an integrated pixel circuit to be practical photosensors. Here we report o...
Article
Full-text available
Thin films of zinc oxide–carbon 60 (ZnO–C 60 ) core–shell quantum dots (QDs) prepared by a simple chemical method were deposited on to a cleaned glass substrate using the spin-coating method with different deposition speeds. Prior to the deposition, ZnO–C 60 QDs (in powder form) were studied using a transmission electron microscope (TEM) to determi...
Article
Recently, interfacial engineering approaches as an efficient strategy for improving the power conversion efficiencies (PCEs) of inverted polymer solar cells (iPSCs) has attracted considerable attention. Among various efficient solutions, solution-processed metal-oxide films prepared from metal oxide sol–gel precursors (or nanoparticles) and polymer...
Chapter
This chapter describes the recent achievements in the field of graphene quantum dots (GQDs)-related research, focusing on the synthesis, surface chemical modification, physical properties, and various applications for energy, environment, and biology. It summarizes various synthetic methods of the GQDs by categorizing them into the bottom-up and to...
Article
Full-text available
Colloidal quantum dots (QDs) are an emerging class of new materials due to their unique physical properties. In particular, colloidal QD based light emitting diodes (QDLEDs) have been extensively studied and developed for the next generation displays and solid-state lighting. Among a number of approaches to improve performance of the QDLEDs, the mo...
Article
Transparent colloidal ZnO quantum-dot (QD)/graphene nanocomposites were formed on poly(ethylene terephthalate) (PET) substrates. Ultraviolet (UV)–visible absorption spectra showed a shoulder peak around 350 nm corresponding to the absorption of ZnO QDs. Optical transmittance of the ZnO QD/graphene/PET multilayer was approximately 80%. High-resoluti...
Article
We investigated the resistive switching characteristics of a polystyrene:ZnO–graphene quantum dots system and its potential application in a one diode-one resistor architecture of an organic memory cell. The log–log I–V plot and the temperature-variable I–V measurements revealed that the switching mechanism in a low-current state is closely related...
Article
The authors investigated the microstructural and the electrical properties of ZnO based dye-sensitized solar cells (DSSCs) fabricated using a low-temperature-processed(200 °C) dye-sensitized ZnO-nanoparticle thin film and a Pt catalyst depositedon ITO/glass by using RF magnetron sputtering. A hydropolymer containing PEG (poly(ethylene glycol)) and...
Article
The authors investigated the microstructural and the electrical properties of ZnO, AZO, and SnO2 based dye-sensitized solar cells (DSSCs) fabricated using a low-temperature-processed (200 °C) dye-sensitized ZnO, AZO, and SnO2 nanoparticle thin film and a Pt catalyst deposited on ITO/glass by RF magnetron sputtering. A hydropolymer containing PEG (p...
Article
Polyethylenimine ethoxylated (PEIE)/monolayered quantum dots (QDs) play a multifunctional role as the electron transport layer and the absorption layer, in addition to causing surface plasmon resonance effects, for improving photovoltaic performance. This leads to a power conversion efficiency increase of up to 8.1% using a PTB7 (poly[[4,8-bis[(2-e...
Article
A hybrid polymer-nanorod (NR) light-emitting diode (LED), consisting of a hole-conducting polymer poly (9-vinyl carbazole) (PVK) and ZnO nanorod (NR) composite, with the device structure of glass/indium-tin-oxide (ITO)/PEDOT:PSS/(PVK + ZnO nanorods)/Al is fabricated through a simple spin coating technique. TEM images shows inhomogeneous deposition...
Article
An inverted-type quantum-dot light-emitting-diode (QD LED), employing low-work function organic material polyethylenimine ethoxylated (PEIE) as electron injection layer, was fabricated by all solution processing method, excluding anode electrode. From transmission electron microscopy (TEM) and scanning electron microscopy (SEM) studies, it was conf...
Patent
Example embodiments are directed to an electronic device and a method for manufacturing the same. The electronic device includes a polymer thin film and an electrode. The polymer thin film includes nanoparticles. The electrode is formed by attaching a graphene thin film of a sheet shape formed through graphene deposition using a vapor carbon supply...
Article
Full-text available
Inverted quantum dot based light-emitting diodes (QDLED) were simply fabricated by an all solution processing. Polyethylenimine ethoxylated (PEIE) was used as a surface modifier in the device, to reduce the indium tin oxide (ITO) electrode work function below 3.08 eV. Based on transmission electron microscopy (TEM) results, CdSe–ZnS QDs with an 8 n...
Article
We report on a novel, simple and easy method to produce graphene layers using chemically synthesized ZnO–graphene quasi core–shell quantum dots. Initially, graphite powder was partially oxidized by acid treatment of graphite powder, which was then mixed with zinc acetate dihydrate in a dimethyl formamide solution. During this process, graphene shee...
Article
Ultraviolet (UV) photodetectors were fabricated using the wet spin-coating for ZnO quantum dots (QDs) and the transfer method for the graphene sheet. High-resolution transmission electron microscopy images showed that the ZnO QDs were uniformly distributed between the voids of the surface circumferences on the graphene layers. Current-voltage measu...
Article
ZnO-graphene quasi core-shell quantum dot (QD) structures in which the inner ZnO QDs are covered with graphene nanoshells have been synthesized via a simple solution process method. The outer graphene nanoshells were identified as a single graphene layer using high resolution transmission electron microscopy (HR-TEM). Zn-O-C (graphene) chemical bon...
Article
A hybrid polymer-quantum dots (QDs) white light-emitting diode (WLEDs) device with a multi-layer structure by all solution processing is simply fabricated by using a spin coating technique. From transmission electron microscopy (TEM) study, red--green--blue (RGB) CdSe/ZnS QDs are mainly distributed along with the circumference of poly(N-vinylcarbaz...
Article
A hybrid polymer-quantum dots (QDs) white light-emitting diode (WLEDs) device with a multi-layer structure by all solution processing is simply fabricated by using a spin coating technique. From transmission electron microscopy (TEM) study, red–green–blue (RGB) CdSe/ZnS QDs are mainly distributed along with the circumference of poly(N-vinylcarbazol...
Article
Transparent conducting multilayer structured electrode of a few nm Ag layer embedded in tin oxide thin film SnOx/Ag/SnOx was fabricated on a glass by RF magnetron sputtering at room temperature. The multilayer of the SnOx(40 nm)/Ag(11 nm)/SnOx(40 nm) electrode shows the maximum optical transmittance of 87.3% at 550 nm and a quite low electrical res...
Article
Full-text available
Hybrid nanostructures combining inorganic materials and graphene are being developed for applications such as fuel cells, batteries, photovoltaics and sensors. However, the absence of a bandgap in graphene has restricted the electrical and optical characteristics of these hybrids, particularly their emissive properties. Here, we use a simple soluti...
Article
Full-text available
We report on the successful conjugation of C60 molecules on the surface of ZnOquantum dots (QDs) and their application in multi-layer structured ultraviolet (UV) photovoltaic (PV) devices. In situ growth of C60 on the surface of ZnO QDs with a core–shell structure was realized via a mild solution-process method, which resulted in an improvement in...
Article
We demonstrate the hybrid polymer-quantum dot based multi-functional device (Organic bistable devices, Light-emitting diode, and Photovoltaic cell) with a single active-layer structure consisting of CdSe/ZnS semiconductor quantum-dots (QDs) dispersed in a poly N-vinylcarbazole (PVK) and 1,3,5-tirs-(N-phenylbenzimidazol-2-yl) benzene (TPBi) fabricat...
Article
Organic bistable devices (OBDs) fabricated utilizing CuInS2 (CIS)/ZnS core–shell-type quantum dots (QDs) blended with a poly(N-vinylcarbazole) (PVK) layer were fabricated on polyethylene terephthalate (PET) substrates by using a spin-coating technique. Transmission electron microscopy images revealed that the CIS/ZnS QDs were distributed over the s...
Article
Full-text available
We present data, which were obtained before bending and after bending, for the electrical bistabilities, memory stabilities, and memory mechanisms of three-layer structured flexible bistable organic memory (BOM) devices, which were fabricated utilizing the ultrathin graphite sheets (UGS) sandwiched between insulating poly(methylmethacrylate) (PMMA)...
Article
Scanning electron microscopy and energy-dispersive spectrometer images of hybrid nanocomposites of ZnO nanoparticles capped with a poly N-vinylcarbazole (PVK) that was fabricated using the spin-coating technique showed that the ZnO nanoparticles were capped with a PVK polymer layer. The measurement of the current-voltage (I-V) of the Al/ZnO nanopar...
Article
We report on the nonvolatile memory characteristics of a bistable organic memory (BOM) device with Au nanoparticles (NPs) embedded in a conducting poly(N-vinylcarbazole) (PVK) colloids hybrid layer deposited on flexible poly(ethyleneterephthalate) (PET) substrates. Transmission electron microscopy (TEM) images show the Au nanoparticles distributed...
Article
Self-assembled SnO2 nanoparticles embedded in a poly(4-vinylphenol) (PVP) polymer layer were formed by using spin coating. X-ray photoelectron spectroscopy spectra showed that Sn 3d and O is peaks corresponding to the SnO2 nanoparticles appeared, indicative of the formation of SnO2 nanoparticles. Bright-field transmission electron microscopy image...
Article
Cu2O nanoparticles were grown on Al2O3 substrates by spin coating and thermal treatment. X-ray diffraction patterns, scanning electron microscopy images, X-ray energy dispersive spectroscopy profiles, and high-resolution transmission electron microscopy images showed that Cu2O nanoparticles were formed on Al2O3 substrates. The photoluminescence (PL...
Article
Organic bistable devices fabircated utilizing SnO2 nanoparticles embedded in a poly(methyl methacrylate) (PMMA) polymer layer were formed by using a spin coating method. Transmission electon microscopy images and photoluminescence spectra showed that synethized SnO2 nanoparticles were randomly distributed in the dibutyl ehter solution. Current-volt...
Article
Full-text available
To fabricate nanoparticle-based dye sensitized solar cells (DSSCs) at a low-temperature, DSSCs were fabricated using hydropolymer and ZnO nanoparticles composites for the electron transport layer around a low-temperature (). ZnO nanoparticle with 20 nm and 60 nm diameter were used and Pt was deposited as a counter electrode on ITO/glass using an RF...
Article
The electrical properties of flexible nonvolatile organic bistable devices (OBDs) fabricated with graphene sandwiched between two insulating poly(methyl methacrylate) (PMMA) polymer layers were investigated. Current-voltage (I-V) measurements on the Al/PMMA/graphene/PMMA/indium-tin-oxide/poly(ethylene terephthalate) devices at 300 K showed a curren...