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Applied Sciences
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NANO KOREA-2020
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NANO KOREA-2020

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Nanotechnology and Applied Nanosciences".

Deadline for manuscript submissions: closed (14 November 2020) | Viewed by 9403

Special Issue Editors

Prof. Dr. Junhong Min

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Guest Editor
School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
Interests: atomic force microscopy; electrical/electrochemical nanobiosensors; optical nanobiosensors; biochips; BioMEMS and BioNEMS; nanobiomaterials for environments; nanotechnology for bio-robotics; nanotechnology for tissue engineering and regenerative medicine; nanomaterials and nanotechnology in drug and gene delivery; nano-toxicology; sample preparation; molecular diagnostic system; bioanalytical engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dae Joon Kang

E-Mail Website
Guest Editor
Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
Interests: synthesis of 2D atomic crystals and their device applications; synthesis of metal oxides and their device physics; electrohydrodynamic lithography; atomic layer deposition
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Won Seok Chang

E-Mail Website
Guest Editor
1. Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
2. Department of Nano-Mechatronics, Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea
Interests: quantum dots; semiconductors; metals; nanolithography; photolithography; nanoimprint; scanning probe lithography; 3D printing; atomic force microscopy; carbon nanotube; flexible device; stretchable device; nanometrology; ultrafast laser processing; laser scanning microscopy; nanomaterial-based flexible device; maskless digital lithography
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Wan Soo Yun

E-Mail Website
Guest Editor
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea
Interests: nanobiosensor; nano-analysis; nanomaterials; nanomanufacturing
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jong-Ryul Jeong

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Korea
Interests: nanomagnetic materials; spin caloritronics; plasmonic nanostructures; magnetoplasmonics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will publish selected papers from the 18th International Nanotech Symposium and Nano-Convergence Exhibition (NANO KOREA 2020), 1–3 July 2020, KINTEX, Korea.

In particular, the symposium, which is the largest symposium on nanoscale science and technology in Korea, will be a meaningful occasion to confirm major research results and up-to-date research trends, increase exchange among researchers in relevant fields, and materialize the results of research. The NANO KOREA symposium will cover the following main topics:

  • Nanoelectronics and photonics;
  • Advanced nanomaterials;
  • Nanofabrication and measurement;
  • Nanobiotechnology and nanomedicine;
  • Nanotechnology for energy;
  • Safety, standardization, and regulation in nanotechnology;
  • Sensors and actuators;
  • Computational nanoscience and technology.

Papers attracting the most interest at the conference or that provide novel contributions will be selected for publication in Micromachines. These papers will be peer-reviewed for the validation of research results, developments, and applications.

Prof. Dr. Junhong Min
Prof. Dr. Dae Joon Kang
Prof. Dr. Won Seok Chang
Prof. Dr. Wan Soo Yun
Prof. Dr. Jong-Ryul Jeong
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Micro/Nanofabrication
  • Nanoelectronics
  • Bionanotechnology
  • Nanomaterials
  • Computational materials design

Published Papers (4 papers)

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Research

12 pages, 6405 KiB  
Article
Continuously Wavelength-Tunable First-Order Narrowband Fiber Comb Filter Using Composite Combination of Wave Retarders
by Jaehoon Jung and Yong Wook Lee
Appl. Sci. 2020, 10(18), 6150; https://doi.org/10.3390/app10186150 - 04 Sep 2020
Cited by 3 | Viewed by 1565
Abstract
Here, by harnessing a composite combination of wave retarders, we propose and experimentally demonstrate a first-order narrowband fiber comb filter capable of continuously tuning its wavelength, of which the filter structure is on the fundamental basis of a polarization–diversity loop structure. The demonstrated [...] Read more.
Here, by harnessing a composite combination of wave retarders, we propose and experimentally demonstrate a first-order narrowband fiber comb filter capable of continuously tuning its wavelength, of which the filter structure is on the fundamental basis of a polarization–diversity loop structure. The demonstrated comb filter consists of a polarizing beam splitter (PBS), two high birefringence fiber (HBF) segments of the same length, an ordered wave retarder combination (WRC) of a quarter-wave retarder (QWR) and a half-wave retarder (HWR) before the first HBF segment, and an ordered WRC of an HWR and a QWR before the second HBF segment. The second HBF segment is butt-coupled to one port of the PBS so that its principal axis should be 22.5° away from the horizontal axis of the PBS. Taking the filter transmittance obtained by Jones calculus into consideration, we found the azimuth orientation angle (AOA) sets of the four wave retarders, which could allow extra phase shifts (ψ’s) ranging from 0° to 360° to be induced in the narrowband transmittance function. From filter transmission spectra calculated according to the AOA sets found above, it is confirmed that the first-order narrowband comb spectrum can be continuously tuned by properly controlling the AOA’s, clearly indicating the continuous wavelength tunability based on a composite combination of ordered wave retarders. This theoretical prediction was verified by actually constructing the proposed filter. Then, it is concluded that our filter employing the composite combination of wave retarders can be continuously frequency-tuned by properly controlling the AOA’s of the wave retarders. Full article
(This article belongs to the Special Issue NANO KOREA-2020)
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16 pages, 4563 KiB  
Article
Improvement of Quantum Dot Light Emitting Device Characteristics by CdSe/ZnS Blended with HMDS (Hexamethyldisilazane)
by Junekyun Park, Eunkyu Shin, Jongwoo Park and Yonghan Roh
Appl. Sci. 2020, 10(17), 6081; https://doi.org/10.3390/app10176081 - 02 Sep 2020
Cited by 4 | Viewed by 3267
Abstract
We demonstrated the way to improve the characteristics of quantum dot light emitting diodes (QD-LEDs) by adding a simple step to the conventional fabrication process. For instance, we can effectively deactivate the surface defects of quantum dot (QD) (e.g., CdSe/ZnS core-shell QDs in [...] Read more.
We demonstrated the way to improve the characteristics of quantum dot light emitting diodes (QD-LEDs) by adding a simple step to the conventional fabrication process. For instance, we can effectively deactivate the surface defects of quantum dot (QD) (e.g., CdSe/ZnS core-shell QDs in the current work) with the SiO bonds by simply mixing QDs with hexamethyldisilazane (HMDS) under atmospheric conditions. We observed the substantial improvement of device characteristics such that the current efficiency, the maximum luminance, and the QD lifetime were improved by 1.7–1.8 times, 15–18%, and nine times, respectively, by employing this process. Based on the experimental data (e.g., energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS)), we estimated that the growth of the SiOx on the surface of QDs is self-limited: the SiOx are effective to passivate the surface defects of QDs without deteriorating the intrinsic properties including the color-purity of QDs. Second, we proposed that the emission profiling study can lead us to the fundamental understanding of charge flow in each layer of QD-LEDs. Interestingly enough, many problems related to the charge-imbalance phenomenon were simply solved by selecting the combination of thicknesses of the hole transport layer (HTL) and the electron transport layer (ETL). Full article
(This article belongs to the Special Issue NANO KOREA-2020)
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9 pages, 2686 KiB  
Article
Template-Assisted Electrochemical Synthesis of CdSe Quantum Dots—Polypyrrole Composite Nanorods
by Won-Seok Kang, Taegon Oh, Gwang-Hyeon Nam, Hyo-Sop Kim, Ki-Suk Kim, Sun-Hyun Park, Jae-Ho Kim and Jae-Hyeok Lee
Appl. Sci. 2020, 10(17), 5966; https://doi.org/10.3390/app10175966 - 28 Aug 2020
Viewed by 2140
Abstract
Luminescent nanoparticles have reached a high level of maturity in materials and spectral tunability for optics and optoelectronics. However, the lack of facile methodology for heterojunction formation of the nanoparticles provides many challenges for scalability. In this paper we demonstrate a simple procedure [...] Read more.
Luminescent nanoparticles have reached a high level of maturity in materials and spectral tunability for optics and optoelectronics. However, the lack of facile methodology for heterojunction formation of the nanoparticles provides many challenges for scalability. In this paper we demonstrate a simple procedure to synthesize a nanoparticle-embedded polymer nanorod hybrid structure via a template-based electrochemical method using anodic aluminum oxide membranes. This method enables the formation of interactive nanostructures wherein the interface area between the two components is maximized. As a proof of concept, semiconducting CdSe nanoparticles were embedded in polypyrrole nanorods with dimensions that can be finely tuned. We observed enhanced photoluminescence of the hybrid structures compared with bare polypyrrole nanorods. Full article
(This article belongs to the Special Issue NANO KOREA-2020)
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15 pages, 6566 KiB  
Article
Arbitrary Phase Modulation of General Transmittance Function of First-Order Optical Comb Filter with Ordered Sets of Quarter- and Half-Wave Plates
by Jaehoon Jung and Yong Wook Lee
Appl. Sci. 2020, 10(16), 5434; https://doi.org/10.3390/app10165434 - 06 Aug 2020
Cited by 1 | Viewed by 1796
Abstract
Here we theoretically and experimentally demonstrated the arbitrary phase modulation of a general transmittance function (GTF) of the first-order optical comb filter based on a polarization-diversity loop structure, which employed two ordered waveplate sets (OWS’s) of a quarter-wave plate (QWP) and a half-wave [...] Read more.
Here we theoretically and experimentally demonstrated the arbitrary phase modulation of a general transmittance function (GTF) of the first-order optical comb filter based on a polarization-diversity loop structure, which employed two ordered waveplate sets (OWS’s) of a quarter-wave plate (QWP) and a half-wave plate (HWP). The proposed comb filter is composed of a polarization beam splitter (PBS), two equal-length polarization-maintaining fiber (PMF) segments, and two OWS’s of a QWP and an HWP with each set located before each PMF segment. The second PMF segment is butt-coupled to one port of the PBS so that its principal axis should be 22.5° away from the horizontal axis of the PBS. First, we explained a scheme to find four waveplate orientation angles (WOA’s) allowing the phase of a GTF to be arbitrarily modulated, using the way each component of the filter, such as a waveplate or PMF segment, affects its input or output polarization. Then, with the WOA finding method, we derived WOA sets of the four waveplates, which could give arbitrary phase retardations ϕ’s from 0° to 360° to a GTF chosen here arbitrarily. Finally, we showed phase-modulated GTF’s calculated at eight selected WOA sets allowing ϕ’s to be 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°, and then the predicted results were verified by experimentally measured results. It is concluded from the theoretical and experimental demonstrations that the GTF of our filter based on the OWS of a QWP and an HWP can be arbitrarily phase-modulated by properly controlling the WOA’s of the four waveplates. Full article
(This article belongs to the Special Issue NANO KOREA-2020)
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