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EBSD를 활용한 고주파 열처리 저합금강 미세구조 정량 분석
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김은아, 정수진, 강신곤
Korean J. Met. Mater.
2024;62(9):685-695. Published online 2024 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.9.685
Abstract
This study aimed to evaluate microstructural changes in various locations of an induction heat treated low-alloy steel in a quantitative manner. A commercially produced ring gear sample of a SNCM 439 steel was prepared. The specimens for experiments were obtained from the gear sample after a surface induction hardening heat.....
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Korean J. Met. Mater.
2024;62(8):624-630. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.624
Abstract
We employed electrophoretic deposition (EPD) using AC voltage to prepare lithium iron phosphate (LFP) Li-ion battery electrodes with varying the LFP thickness, to compare bulk-limited electro chemical reaction with the surface-limited electrochemical reactions. We analyzed the electrochemical performances of the thin and thick LFP electrodes at various scan rates. They.....
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Web of Science 1
Crossref 1
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다중물질의 초소수성 원통 위 거동: 액적 크기 및 계면각도의 영향
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최우락, 윤성찬
Korean J. Met. Mater.
2024;62(3):222-228. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.222
Abstract
Compound droplets can consist of two or more immiscible substances sharing an interface. Among such droplets, the low-viscosity component of Janus droplets can exhibit peculiar bouncing behavior on nonwettable surfaces. There have been recent advances in droplet control technologies, however the impact dynamics of droplets on complex surfaces, and strategies.....
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일방향 응고 CM247LC 초내열합금 크리프 시편 게이지에서 고온 산화가 표면 피트 및 재결정 형성에 미치는 영향
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최병학, 최광수, 한성희, 김대현, 안종기, 강동수, 서성문
Korean J. Met. Mater.
2023;61(12):951-957. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.951
Abstract
This study analyzed a recrystallization phenomenon that occurred simultaneously with hightemperature oxidation on the surface of a directionally solidified CM247LC creep specimen, using optical and scanning electron microscopy. After heat treatment, the surface of the specimen subjected to the creep test at 982oC was oxidized by exposure to high temperature.....
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Web of Science 2
Crossref 2
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브레이크 마찰재의 마찰특성에 미치는 부식 환경의 영향
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신희섭, 김율구, 이상목
Korean J. Met. Mater.
2023;61(12):943-950. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.943
Abstract
The friction properties of brake friction materials are investigated utilizing the different car cleaners. Water, wheel cleaner and tire dressing were used to designate driving conditions in the field. The friction materials were soaked in each solution before friction test. The Coefficient of friction (COF) was similar in the case.....
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초소수성 표면 위 다중물질의 동역학 연구: 액적 크기 및 형상의 영향
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김재웅, 윤성찬
Korean J. Met. Mater.
2023;61(5):371-378. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.371
Abstract
Compound materials have two or more unmixable parts that retain a shared surface with one another for engineering purposes. Such compound materials, like the Janus or core–shell configurations, create opportunities for relevant applications because they offer diverse combinations of complex impinging materials and complex surfaces. However, previous studies have only.....
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Web of Science 1
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고전류밀도에서의 탄산칼륨 첨가제의 전해동박 특성에 미치는 영향
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우태규, 박일송
Korean J. Met. Mater.
2023;61(5):347-354. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.347
Abstract
The amount and kind of additives in electrolytes play a very important role on the electroplating of Cu foil, which is used as a cathode materials for secondary batteries. As the use of Cu foil increased, various studies on the electroplated Cu foil are urgently needed. We studied surface characteristics.....
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Crossref 1
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레이저 급속 표면용융에 따른 일방향응고 247LC 초내열합금의 에피택셜 성장 및 응고균열 억제 방안
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김경민, 천은준
Korean J. Met. Mater.
2023;61(4):252-260. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.252
Abstract
In this study, the relationship between solidification cracking and epitaxial growth behavior with the high-speed laser surface melting of a directionally solidified 247LC superalloys was fundamentally and metallurgically investigated, to develop a successful welding procedure for the next generation of gas turbine blades. Under typical laser surface melting conditions (scan.....
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Web of Science 2
Crossref 3
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표면적이 발달된 1.5 μm Ag 입자 기반 페이스트의 초고속 열압착 소결접합 및 열처리 효과
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김영중, 한병조, 이종현
Korean J. Met. Mater.
2022;60(11):827-836. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.827
Abstract
To rapidly sinter a bondline and obtain mechanical stability at high temperature and high thermal conductivity, 1.5 μm Ag particles with enhanced surface area were synthesized by a wet-chemical method, and a sinter-bonding paste containing these Ag particles was obtained. Some particles were present in the form of agglomerates of.....
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Web of Science 3
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초음파 미세 표면 냉간단조법(UNSM)을 적용한 AZ31 마그네슘 판재의 단면 미세조직 및 강도 향상 효과 분석
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강명성, 강주희, 박현욱, 김준형, 편영식, 백민재, 이동준, 이승진, 박상후, 김홍물, 박성혁, 최윤석
Korean J. Met. Mater.
2022;60(3):169-179. Published online 2022 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2022.60.3.169
Abstract
An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a 1-mm thick AZ31 magnesium sheet. UNSM is a relatively new surface modification technique in which a hard, hemispherical tip (2.38 mm in diameter) strikes the surface at an ultrasonic frequency to induce plastically deformed gradient microstructures and deep compressive.....
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Web of Science 4
Crossref 4
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열보조 나노 전사 프린팅을 통한 금속 박막의 표면 주름 나노패턴 형성 방법
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박태완, 박운익
Korean J. Met. Mater.
2021;59(12):880-885. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.880
Abstract
Nanopatterning methods for pattern formation of high-resolution nanostructures are essential for the fabrication of various electronic devices, including wearable displays, high-performance semiconductor devices, and smart biosensor systems. Among advanced nanopatterning methods, nanotransfer printing (nTP) has attracted considerable attention due to its process simplicity, low cost, and great pattern resolution. However,.....
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Korean J. Met. Mater.
2021;59(8):567-574. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.567
Abstract
The bonding properties of adhesives are mainly affected by surface roughness, topography and chemical adsorption. In this paper, we studied the effects of surface pretreatment of Al 2024-T3 (bare) in terms of surface roughness, topography and surface free energy. Surface pre-treatment included solvent cleaning, FPL etching, PAA and CAA treatment......
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Web of Science 1
Crossref 2
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JGB 첨가제에 의한 동박의 미세구조변화와 전기적 특성
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우태규, 박일송
Korean J. Met. Mater.
2021;59(6):404-411. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.404
Abstract
Extremely thin film high quality copper foil is required to ensure high performance in electronics and slimness in secondary batteries. During the electroplating of copper foil, Janus Green B(JGB) and Collagen were introduced as additives to the electrolytes to study their effects. The structural and electrical properties of the electroplated.....
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Web of Science 5
Crossref 5
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고전류밀도에서의 첨가제 초기 거동 및 동박의 기계적 특성
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우태규, 박종재, 박일송
Korean J. Met. Mater.
2021;59(5):304-313. Published online 2021 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.5.304
Abstract
In this study, we studied the surface and mechanical properties of multiple additives as well as the initial plating properties of individual additives. With the individual additive groups, copper crystals tended to converge at a stage above the critical amount of additive. When chloride ions were added, large crystals formed.....
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Web of Science 4
Crossref 4
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Korean J. Met. Mater.
;59(2):135-141. Published online 2021 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2021.59.2.135
Abstract
The formation of porous material structures has been widely investigated for the development of high-performance energy materials, catalysts, and chemical sensing devices. Various nanoporous structure fabrication methods are based on wet-chemical processes, which require precise control of the process parameters. Physical vapor deposition such as thermal evaporation utilizes high vacuum.....
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Web of Science 5
Crossref 4
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A6014-T4 합금 소재의 저항 점 용접 시 용융 거동 및 전극 열화에 미치는 전극 패터닝 효과
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전현욱, 김재훈, 김재원, 이은경, 김양도, 지창욱
Korean J. Met. Mater.
2020;58(12):863-874. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.863
Abstract
In this study, the effects of electrode surface design on the resistance spot weldability and degradation of the electrode following resistance spot welding (RSW) of aluminum 6014-T4 alloy were investigated. A new patterning method that can be produced through repetitive pressurization was applied to the electrode, producing a lattice-like pattern.....
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Web of Science 6
Crossref 7
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Korean J. Met. Mater.
2020;58(9):645-652. Published online 2020 Aug 13
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.645
Abstract
Because of their simplicity and low equipment costs, various oxidation methods can be used to create metal oxides, but they still require long processing times and/or high temperatures. In this study, a new electrochemical oxidation (ECO) method, which oxidizes metal in DI water with a constant flowing current to both.....
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Web of Science 2
Crossref 1
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AISI 4115 강의 진공 침탄 시 아세틸렌 유량에 따른 침탄 거동
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권기훈, 문경일, 이영국, 정민수
Korean J. Met. Mater.
2020;58(9):617-625. Published online 2020 Aug 13
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.617
Abstract
The vacuum carburizing behavior of AISI 4115 steel according to acetylene flow rates (1, 5, 10, 20, 30, 40, and 50 sccm) and temperatures (900, 950, and 1000
o
C) was quantitatively investigated through microstructure, carbon concentration and hardness analyses. As the acetylene flow rate increased, the penetration rate of carbon.....
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Korean J. Met. Mater.
2020;58(8):560-565. Published online 2020 Jul 27
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.560
Abstract
This study investigated the influence of laser shock peening without coating (LSPw/oC) on the degradation of copper electrical contacts. A theoretical calculation of the plastic-affected depth (PAD) induced by LSPw/oC was performed, based on the laser-induced plasma pressure along with the Hugoniot elastic limit of our LSPw/oC experimental conditions. The.....
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Web of Science 4
Crossref 3
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Korean J. Met. Mater.
2020;58(5):326-333. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.326
Abstract
A reliable and efficient numerical method is presented for the design of broadband absorbers, fabricated by layering two square patch-frequency selective surfaces (SP-FSS) with different geometries on a grounded dielectric substrate. The circuit parameters of the inductance and capacitance of the SP-FSS were retrieved using the strip wire conductor model......
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Web of Science 2
Crossref 2
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나노인덴테이션 방법으로 크롬 박막의 고유경도를 측정하는 방법과 영향 인자
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강영준, 백주환, 박현, 조영래
Korean J. Met. Mater.
2020;58(3):207-215. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.207
Abstract
Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer.....
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Web of Science 4
Crossref 3
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Zn계 합금도금재의 미세구조 및 내식성에 미치는 합금 조성 변화 영향
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이재원, 김성진, 오민석
Korean J. Met. Mater.
2020;58(3):169-174. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.169
Abstract
The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn
2
binary eutectic, Zn/Al binary eutectoid and.....
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Web of Science 7
Crossref 5
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레이저 가공 기반 사출 금형강의 선택적 표면 개질 연구: 레이저 나이트라이딩에 따른 AlN 형성 및 경화 거동
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천은준, 박창규, 박원아
Korean J. Met. Mater.
2020;58(1):32-40. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.32
Abstract
Laser surface heat treatment and laser nitriding processes were applied using selective surface modification techniques to investigate phase transformation, microstructural evolution, and surface hardening behaviors for two types of plastic injection mold steels, AISI 1045 and P21. During laser surface heat treatment, a 245% hardness increase compared to that of.....
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Web of Science 5
Crossref 5
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나노-마이크로 패턴의 형성에 미치는 기판의 표면 거칠기 영향
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박태완, 변명환, 정현성, 박운익
Korean J. Met. Mater.
2020;58(1):26-31. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.26
Abstract
The ability to form high quality nano-/micro- patterns is very important for the nanofabrication of high-density electronic devices. However, remaining challenges have yet to be resolved, including low quality roughness, low pattern resolution, and the highly complex process. In this study, we suggest a novel and simple method for creating.....
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Web of Science 1
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주파수 선택 표면이 부착된 카보닐 철 분말 복합재의 전파흡수특성
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조한신, 김성수
Korean J. Met. Mater.
2019;57(11):741-746. Published online 2019 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.741
Abstract
With the increased use of diverse electronics in the high frequency spectrum, high-performance absorbing and shielding materials are needed to ensure electromagnetic compatibility. Microwave absorbance of polymer composites of carbonyl iron powders with frequency selective surface (FSS) is investigated, focusing on the frequency of 5.8 GHz. Composite sheets were prepared.....
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Crossref 3
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Korean J. Met. Mater.
2019;57(9):582-588. Published online 2019 Aug 21
DOI:
https://doi.org/10.3365/KJMM.2019.57.9.582
Abstract
Chemical mechanical polishing (CMP) of bulk AlN was performed with colloidal silica slurry at pH 9 for different times. The result shows that colloidal silica slurry at pH 9, which has the relatively high surface charge of -50.7 mV is most stable, and it was selected as chemically optimum condition.....
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Web of Science 4
Crossref 3
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RF 마그네트론 스퍼터링으로 증착한 산소 결핍 구조 TiO
2-x
박막 트랜지스터에 미치는 급속 열처리 온도의 영향
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김한상, 이재윤, 김성진
Korean J. Met. Mater.
2019;57(7):438-446. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.438
Abstract
We investigated the effect of rapid thermal annealing (RTA) temperature report on oxygendeficient rutile TiO
2-x
thin-film transistors deposited by RF magnetron sputtering. Amorphous TFTs that use TiO
2-x
semiconductors as an active layer can be fabricated by low-temperature process and show remarkable electrical performance. The RTA post-annealing process provides greater production.....
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Web of Science 1
Crossref 1
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질산용액 및 질소가스 분위기에서 Ti-6Al-4V 합금의 레이저 표면질화 특성분석
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황태우, 한상욱, 오일영, 문영훈
Korean J. Met. Mater.
2019;57(7):412-421. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.412
Abstract
Laser nitriding is a surface engineering technique that is being used on titanium alloys to improve their surface hardness and wear resistance. It is an attractive process because of its simplicity and the possibility of producing hard layers of substantial depth with minimum effect to the bulk of the material......
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Web of Science 4
Crossref 4
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TiO
2
/TiO
2-x
박막층의 두께가 멤리스터 소자의 특성에 미치는 영향
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김한상, 김성진
Korean J. Met. Mater.
2019;57(2):84-90. Published online 2019 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.84
Abstract
Memristors have been extensively investigated as the fourth fundamental circuit element. Titanium oxide is a common material used to fabricate memristors. In this paper, we investigated the influence of the thickness of the oxide active layer on the Al/TiO2-x/TiO2/heavily doped electrode memristor architecture. An insulating TiO2 thin-film was deposited using.....
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Web of Science 6
Crossref 6
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교번스퍼터링법에 의해 다양한 기지상 재료위에 형성된 Au 나노입자의 성장거동에 대한 전기, 광학적 분석
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김범준, 김현철, 박종건, 이경석
Korean J. Met. Mater.
2017;55(10):739-744. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.739
Abstract
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface plasmons. In this study, we employed an alternating sputtering method to fabricate such nanocomposite films......
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