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Effect of In-Situ Post Heating on Repairing STS316L Built by Laser Powder Bed Fusion Using Direct Energy Deposition
레이저로 적층 제조된 STS316L에 대한 직접에너지적층 응용 보수 시 공정 중 후열처리(In-Situ Post Heating) 효과
Wook Jin Oh, Yong Son, Do Sik Shim
오욱진, 손용, 심도식
Korean J. Met. Mater. 2019;57(8):543-553.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.543

The repairing parts were fabricated by PBF (powder bed fusion) using direct energy deposition (DED), interfacial cracks can occur at the interface between the substrate and the area to be repaired. Such interfacial defects are due to the thermal stress induced by the temperature gradient which results from repeated melting..... More

Computational Design of Highly Efficient and Robust Hole Transport Layers in Perovskite Solar Cells
페로브스카이트 태양전지의 최적 정공수송층 물질 및 구조 탐색 시뮬레이션
Jiyoung Jeong, Dongjun Song, Jihye Choe, Choong-Heui Chung, Ki-Ha Hong
정지영, 송동준, 최지혜, 정중희, 홍기하
Korean J. Met. Mater. 2019;57(8):535-542.   Published online 2019 Jul 4
DOI: https://doi.org/10.3365/KJMM.2019.57.8.535

We investigated the effects of materials and the film thickness of hole transport layers (HTLs) on inverted type perovskite solar cells using optics-charge transport coupled simulations. Power conversion efficiencies (PCEs), and the variations in efficiency induced by the film thickness dispersion, were intensively studied, to compare potential HTLs candidates like..... More

Thermal Conductivity of Three-Dimensionally Interconnected Graphene-Networked Cu Composite Fabricated by a Simple Two-Step Process
Xue Li, Terry Arthur Ring, Byung-Sang Choi
Korean J. Met. Mater. 2019;57(8):529-534.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.529

A Cu composite reinforced by a three-dimensionally interconnected graphene network was synthesized in situ by a simple two-step process utilizing compacted Cu powder (99% purity) as a template for the growth of graphene. Cu composites with different graphene contents were obtained by controlling the processing parameters. The composites were approximated..... More

Effect of Anodic Oxidation Process Parameters on TiO2 Nanotube Formation in Ti-6Al-4V Alloys
Ti-6Al-4V합금에서 양극산화 공정변수가 TiO2 나노튜브 형성에 미치는 영향
Seung-Yeon Yoo, Hyun Gyoon Park
유승연, 박현균
Korean J. Met. Mater. 2019;57(8):521-528.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.521

To investigate the effect of anodic oxidation process parameters on TiO2 nanotube formation in Ti-6Al-4V alloys, the composition of NH4F and H2O in the anodic oxidation processes were changed under the conditions of constant DC power ranging from 20 V to 60V and current density ranging from 10 mA to..... More

Photocatalytic Characterization of TiO2 Nanotubes with Pd Particles Synthesized by Photoreduction Process
광환원반응을 통한 TiO2/Pd 복합광촉매 제조와 광촉매 특성
Jong-Ho Lee, Hong-Joo Ahn, Jeong-Il Youn, Young-Jig Kim, Su-Jeong Suh, Han-Jun Oh
이종호, 안홍주, 윤정일, 김영직, 서수정, 오한준
Korean J. Met. Mater. 2019;57(8):510-520.   Published online 2019 Jul 8
DOI: https://doi.org/10.3365/KJMM.2019.57.8.510

To decompose dye in aqueous solution, Pd nanoparticle-decorated TiO2 nanotube photocatalysts were fabricated through electrochemical anodization and photoreduction processes. Morphological and surface characterization of the TiO2/Pd heterojunction photocatalyst, as well as photoelectrochemical behaviors, were investigated by X-ray diffraction, UV/Vis diffuse reflectance and photocurrent response. It was found that the precipitated..... More

Effects of Rapid Thermal Annealing on the Structural, Optical, and Electrical Properties of ZnO/Ag/SnO2 Tri-Layer Films
Su-Hyeon Choe, Yu-Sung Kim, Jin-Young Choi, Yun-Je Park, Byung-Chul Cha, Young-Min Kong, Daeil Kim
Korean J. Met. Mater. 2019;57(8):506-509.   Published online 2019 Aug 5
DOI: https://doi.org/10.3365/KJMM.2019.57.8.506

ZnO 50 nm/Ag 10 nm/SnO2 50 nm (ZAS) tri-layer films were deposited on a glass substrate by RF and DC magnetron sputtering and then underwent rapid thermal annealing in a low vacuum of 1×10-3 Torr to investigate the effects of post-deposition annealing on the optical and electrical properties of the..... More

Separation of Tb(III) and Dy(III) from Chloride Solution by Extraction and Scrubbing with Ionic Liquid Prepared with Cyanex 272 and Aliquat 336
Cyanex 272와 Aliquat 336으로 제조한 이온성액체로 염산용액에서 추출과 세정에 의한 터븀(III) 및 디스프로슘(III)의 분리
Chang Geun Oh, Seong Ho Son, Man Seung Lee
오창근, 손성호, 이만승
Korean J. Met. Mater. 2019;57(8):499-505.   Published online 2019 Jul 8
DOI: https://doi.org/10.3365/KJMM.2019.57.8.499

Terbium and dysprosium are rare earth elements which are employed in the manufacture of advanced materials. Separating Tb(III) and Dy(III) is very complicated because their chemical properties are similar. In order to develop a separation process based on solvent extraction, extraction and scrubbing experiments were conducted using weak hydrochloric solutions..... More

Hydrogen-Induced Cracking of Laser Beam and Gas Metal Arc Welds on API X65 Steel
Junghoon Lee, Myeonghyun Kim, Yeongdo Park, Cheolho Park, Cheolhee Kim, Namhyun Kang
Korean J. Met. Mater. 2019;57(8):491-498.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.491

Hydrogen-induced cracking (HIC) behavior was analyzed for gas metal arc (GMA) and laser beam (LB) welds on American Petroleum Institute (API) X65 steel. The GMA welds consisted of acicular ferrite (AF) with some widmanstatten ferrite (WF), while the LB welds had bainitic ferrite (BF) with some AF. The welds and..... More

Effect of Rolling Temperature on the Microstructural Characteristics of High-Speed-Rolled Mg Alloy with Initial Non-Basal Texture
비기저면 집합조직을 가지는 마그네슘 합금의 고속압연 온도 변화에 따른 압연재 미세조직 변화
Su Jin Lee, Ye Jin Kim, Jeong Hun Lee, Sung Hyuk Park
이수진, 김예진, 이정훈, 박성혁
Korean J. Met. Mater. 2019;57(8):482-490.   Published online 2019 Jul 4
DOI: https://doi.org/10.3365/KJMM.2019.57.8.482

In this study, the effects of rolling temperature on the microstructural characteristics of a highspeed-rolled Mg alloy with a non-basal texture were investigated. To this end, commercial AZ31 alloy samples in which the basal poles of most grains were tilted at an angle of 45° from the normal direction (ND)..... More

Study of Shape and Microstructure Changes of Ta Linear for Building an Explosively Formed Penetrator
탄탈륨 라이너의 폭발성형관통자 형성 시 형상 및 조직 변화 연구
Sung Taek Park, Ju Yeong Kim, Gwang Lyeon Kim, Hyun-Su Kang, Kyeong Won Oh, Hyung-Ki Park, Yi Hwa Song
박성택, 김주영, 김광련, 강현수, 오경원, 박형기, 송이화
Korean J. Met. Mater. 2019;57(8):475-481.   Published online 2019 Aug 5
DOI: https://doi.org/10.3365/KJMM.2019.57.8.475

An explosively formed penetrator (EFP) is a kind of kinetic energy warhead that contains a metal linear structure. After exploding, the linear structure in the EFP is deformed and hits the target as a form of aero-stable long-rod penetrator. To achieve high penetration performance, Ta is commonly used as the..... More

Evolution of Microstructure and Mechanical Characteristics in Rejuvenation of a Hot Gas Pass Component of a Gas Turbine by Heat Treatment and HIP
열처리 및 HIP 공정을 이용한 가스터빈 고온부품 재생시 미세조직 및 기계적 특성 변화
Sung Yong Chang, Ki-Yong Oh
장성용, 오기용
Korean J. Met. Mater. 2019;57(7):468-474.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.468

The evolution of microstructure and mechanical characteristics during the rejuvenation of a hot gas pass component of a gas turbine was investigated with an actual service-exposed bucket in a power plant. Heat treatment and hot isostatic pressing processes were conducted to rejuvenate a hot gas pass component of a F..... More

Effect of Process Parameters on the Angular Distribution of Sputtered Cu Flux in Long-Throw Sputtering System
Hee-Young Shin, Tae-Ho Kim, Jun-Woo Park, Hyun-Chul Sohn
Korean J. Met. Mater. 2019;57(7):462-467.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.462

In this work, the angular distribution of the sputtered Cu flux in a long throw sputtering (LTS) system is extracted from the comparison of experimentally-measured profiles of deposited films with simulated profiles of films in overhang contact structure. And effects of the sputtering process parameters such as Ar pressure during..... More

Properties of Perovskite Solar Cells with GO Addition on TiO2 Layer
TiO2의 GO 혼합 양에 따른 페로브스카이트 태양전지의 물성 연구
Hyeryeong Lee, Kwangbae Kim, Ohsung Song
이혜령, 김광배, 송오성
Korean J. Met. Mater. 2019;57(7):456-461.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.456

The photovoltaic properties of perovskite solar cells (PSCs) were investigated by adding graphene oxide (GO) to the electron transport layer of TiO2. The PSCs were fabricated with a glass/FTO/BL-TiO2/meso-TiO2 + GO/perovskite/HTL/Au electrode structure by adding various contents of GO (0.0, 0.3, 0.5 and 0.7 wt%) to the TiO2 layer. To..... More

Photoelectrochemical Properties of Copper Oxide Photoelectrode with Various Copper Oxide Buffer Layers
CuO 버퍼층 증착 횟수에 따른 CuO 광전극의 광전기화학적 특성 연구
Seung-Hwan Jeon, Yaejin Hong, Hyukhyun Ryu, Won-Jae Lee
전승환, 홍예진, 류혁현, 이원재
Korean J. Met. Mater. 2019;57(7):447-455.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.447

In this study, a CuO buffer layer was deposited on a fluorine-doped tin oxide (FTO) substrate using a spin coating method, and then a CuO photoelectrode was grown on the CuO buffer layer using a modified-chemical bath deposition (M-CBD) method. We investigated the morphological, structural, optical, electrical and photoelectrochemical properties..... More

Effect of Rapid Thermal Annealing Temperature on Oxygen-Deficient TiO2-x-based Thin-Film Transistors Deposited by RF Magnetron Sputtering
RF 마그네트론 스퍼터링으로 증착한 산소 결핍 구조 TiO2-x 박막 트랜지스터에 미치는 급속 열처리 온도의 영향
Han-Sang Kim, Jae-Yun Lee, Sung-Jin Kim
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

We investigated the effect of rapid thermal annealing (RTA) temperature report on oxygendeficient rutile TiO2-x thin-film transistors deposited by RF magnetron sputtering. Amorphous TFTs that use TiO2-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..... More

PWHT Cracking Susceptibility in the HAZ of Martensitic 10Cr Steel for A-USC Power Plant
극초임계압 화력발전소용 마르텐사이트계 10Cr 내열강 열영향부의 용접후열처리 균열 감수성
Minjeong Kim, Yongjoon Kang, Namkyu Kim, Sanghoon Lee, Sangwoo Song, Namhyun Kang
김민정, 강용준, 김남규, 이상훈, 송상우, 강남현
Korean J. Met. Mater. 2019;57(7):430-437.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.430

In this study, the post-weld heat treatment (PWHT) cracking susceptibility in the heat affected zone (HAZ) of martensitic 10Cr steel was evaluated. The specimens taken from the 10Cr steel were thermally cycled using a Gleeble to simulate HAZ 1 (δ-ferrite) and HAZ 2 (single phase, γ). HAZ 2 had martensite..... More

Effect of Carbides Formed in 9Cr-1Mo-V-Nb Weld Metals on Elevated Temperature Tensile Strength
9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
Byungrok Moon, Junghoon Lee, Namhyun Kang, Taeho Lee, Woosang Jung, Chulgyu Park, Kyungmox Cho
문병록, 이정훈, 강남현, 이태호, 정우상, 박철규, 조경목
Korean J. Met. Mater. 2019;57(7):422-429.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.422

Alloy design of 9Cr-1Mo-V-Nb weld metals was carried out through thermodynamic simulation, and elevated temperature tensile testing was performed on the designed alloy. Based on the thermodynamic simulation of the 9Cr-1Mo-V-Nb weld metal, 0.09 to 0.10 wt% C was added to increase Cr-rich M23C6. Nitrogen was reduced from 0.04 to..... More

Characterization of the Laser Surface Nitriding of Ti-6Al-4V Alloys in Nitric Acid Solution and Nitrogen Gas Atmosphere
질산용액 및 질소가스 분위기에서 Ti-6Al-4V 합금의 레이저 표면질화 특성분석
Tae-woo Hwang, Sang-wook Han, Il-yeong Oh, Young-hoon Moon
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

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...... More

Effects of Molybdenum on HIC Susceptibility in Normalized Pressure Vessel Steels for Sour Service Applications
Kijung Park, Dae Hyun Cho, Min-Ho Park, Cheol-Woong Yang
Korean J. Met. Mater. 2019;57(7):405-411.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.405

This paper discusses a molybdenum-added alloy design for normalized pressure vessel steels, to reduce hydrogen induced cracking (HIC) and inhibit crack propagation. The change in microstructure produced by the modified alloy composition was analyzed to determine its effect on HIC characteristics. The microstructural change was observed by optical microscopy, hardness..... More

Effect of Pre-Aging Treatment on Bake-Hardenability of Al-8.0Zn-2.5Mg-2.0Cu Alloy Sheet Fabricated by Twin-Roll Casting Process
박판주조공정으로 제조한 Al-8.0Zn-2.5Mg-2.0Cu 합금 판재의 소부경화특성에 미치는 예비시효의 영향
Ji-Goo Heo, Yun-Soo Lee, Min-Seok Kim, Hyoung-Wook Kim, Yang-Do Kim
허지구, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater. 2019;57(6):396-404.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.396

The effects of natural and pre-aging on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-2.0Cu aluminum alloy sheet fabricated by twin roll casting were investigated. Immediately after solution treatment, the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet had a yield strength of 173 MPa and elongation of 19.5%. The hardness of the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet..... More

Tin Microcrystals Synthesized by Thermal Chemical Vapor Deposition in a Hydrogen-Reducing Atmosphere
Daseul Ham, Won Jeong, Hyon Chol Kang
Korean J. Met. Mater. 2019;57(6):390-395.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.390

We demonstrate a synthetic route to high-quality Sn microcrystals using thermal chemical vapor deposition (CVD) in a hydrogen-reducing atmosphere. During thermal CVD with SnO2 powder, a mixture of Ar and H2 (4%) gases was used as a carrier gas to maintain a hydrogen reduction environment. Hydrogen maintained a reduction environment..... More

Study on Shape Optimization of Automotive Door Impact Beam for Light Weight Design and Improved Crash Performance
자동차 도어보강재의 경량화 및 충돌특성 향상을 위한 형상 최적화 연구
Woochang Jeong
Korean J. Met. Mater. 2019;57(6):381-389.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.381

A study on shape optimization of a hot-stamped automotive door impact beam for lightweight design and improved crash performance was conducted using a static collision analysis based on FMVSS 214. An integral type one-piece door impact beam of bracket parts and pipe was realized using hot stamping technology. The method..... More

Effects of Al, V, Cr, Mn, Ni, Nb, Mo, and W Addition to BCC-Fe on its Elastic Properties and Hardness for a Biomass Boiler: First Principles Approaches
Al, V, Cr, Mn, Ni, Nb, Mo 및 W 첨가에 따른 바이오매스 보일러용 BCC-Fe의 탄성 특성과 경도 변화의 이론적 고찰
Jiwoong Kim, MyungJae Kim, Chang Yul Seo, Jungho Ryu, Taegong Ryu, Hye-Jin Hong, Doyeon Shin, Yong Jae Suh
김지웅, 김명재, 서창열, 류정호, 류태공, 홍혜진, 신도연, 서용재
Korean J. Met. Mater. 2019;57(6):374-380.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.374

During biomass combustion for renewable energy generation, combustion byproducts such as fly ash and metal chlorides cause serious erosion problems in boilers, as well as corrosion. To develop a highly wear-resistant composition of alloy for biomass boilers, we investigated how the addition of various metallic elements to BCC-Fe affected its..... More

Synthesis and Thermoelectric Properties of (La1−zNdz)0.8Fe4−xCoxSb12 Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2019;57(6):366-373.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.366

p-Type (La1−zNdz)0.8Fe4−xCoxSb12 skutterudites were prepared by partial double filling with La/Nd and charge compensation by substituting Co for Fe. The skutterudite phase was successfully synthesized using encapsulated melting, quenching, annealing and hot-pressing processes, but a small amount of the marcasite phase was identified. Partial filling within the filling fraction limit..... More

Study on the Optimum Conditions for Synthesizing a Cathode Active Material Precursor in Li-Ion Batteries Using a Taylor Reactor
테일러 반응기를 이용한 최적의 리튬이차전지용 양극활물질 전구체 합성 조건 선정을 위한 연구
Deokhyun Han, Iljeong Park, Minjun Kim, Daeweon Kim, Hangchul Jung
한덕현, 박일정, 김민준, 김대원, 정항철
Korean J. Met. Mater. 2019;57(6):360-365.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.360

Li(Ni1-x-yCoxMny)O2 (NCM) materials, which are the cathode active material for lithium ion batteries, have been developed and widely used as an alternative to lithium cobalt oxide, because of the high cost of cobalt. To synthesize high quality NCM materials, it is important to control the process manufacturing of the NCM..... More

Visualization of Magnetic Domains in Electrical Steel Using High-Resolution Dark-Field Imaging
Youngju Kim, Jongyul Kim, Daniel Seth Hussey, Oh Youl Kwon, Seung Wook Lee
Korean J. Met. Mater. 2019;57(6):352-359.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.352

Electrical steel is a soft magnetic steel material used in electric devices such as transformers and motors. The performance of these electric devices is primarily related to the magnetic properties of electrical steel, and the assessment of the magnetic properties of electrical steel has been considered an important topic. We..... More

Effect of Ni and Cu Addition on Corrosion Behaviors of Pre-Oxidized Ultra-Strong Steel for Automotive Applications
Ni 및 Cu 첨가가 고온 산화된 자동차용 초고강도 강재의 부식 거동에 미치는 영향
Seung Min Ryu, Hwan Goo Seong, Jeong Kil Kim, Joong-Ki Hwang, Man Jae Lee, Min-Suk Oh, Sung Jin Kim
류승민, 성환구, 김정길, 황중기, 이만재, 오민석, 김성진
Korean J. Met. Mater. 2019;57(6):343-351.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.343

The incomplete elimination of oxide scale formed during the normalizing process can result in severe degradation of the surface and mechanical properties of ultra-strong steels. This study revealed that the formation of oxide scale was highly dependent upon the alloying elements Ni and Cu. Ni-bearing steel showed a much higher..... More

Influence of Carbon Content and Isothermal Heat Treatment Temperature on the Microstructure and Mechanical Properties of Ultra-High Strength Bainitic Steels
초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향
Seung Hwangbo, Hong-Bum Lee, Young-Beum Song, Jinhee Ham, Hong-Kyu Kim, Dong-Woo Suh
황보승, 이홍범, 송영범, 함진희, 김홍규, 서동우
Korean J. Met. Mater. 2019;57(6):335-342.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.335

The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but..... More

Electronic Transport and Thermoelectric Properties of Cu12-xZnxSb4S13 Tetrahedrites Prepared by Mechanical Alloying and Hot Pressing
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2019;57(5):328-333.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.328

Tetrahedrite Cu12Sb4S13 has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. When the Cu atoms of Cu12Sb4S13 are partially substituted with a transition metal, changes in the Cu vibrations can intensify phonon scattering,..... More

Influence of Film Thickness on the Electrical and Optical Properties of ZnO/Ag/SnO2 Tri-Layer Films
ZnO/Ag/SnO2 적층박막의 두께 변화에 따른 전기적, 광학적 특성 연구
Yu-Sung Kim, Jin-Young Choi, Yun-Je Park, Su-Hyeon Choe, Young-Min Kong, Daeil Kim
김유성, 최진영, 박윤제, 최수현, 공영민, 김대일
Korean J. Met. Mater. 2019;57(5):324-327.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.324

ZnO/Ag/SnO2 (ZAS) tri-layer films were prepared on glass substrates via RF and DC magnetron sputtering, and then the influence of the thickness of the ZnO and SnO2 layers on the optical and electrical properties of the ZAS films was investigated. As deposited ZnO 50 nm/Ag 10 nm/SnO2 50 nm films..... More

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