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A low-cure-temperature copper nano ink for highly conductive printed electrodes
Byoungyoon Lee,Yoonhyun Kim,Seungnam Yang,Inbum Jeong,문주호 한국물리학회 2009 Current Applied Physics Vol.9 No.2
We have developed a copper metal-organic-based conductive ink which can be applied to printing and roll-to-roll processes. Metal-organics printed on flexible substrates decompose into highly conductive copper metal when annealed at above 250 ℃. The new nano ink was prepared by mixing copper carboxylate with copper complex nano particles of a mean size below 100 nm. The viscosity of the copper ink was in the range of 104–105 mPa s (at 50 rpm). The resistivity of the conductive film, after annealing under the condition of 3% H2 above 250 ℃ for 20 min, was below 10 μΩ cm and it could be further reduced to 4.4 μΩ cm when annealed at 320 ℃ for 20 min. We successfully demonstrated a printable copper nano ink that proceeds to form highly conductive metal film when annealed at low temperature on flexible substrates. We have developed a copper metal-organic-based conductive ink which can be applied to printing and roll-to-roll processes. Metal-organics printed on flexible substrates decompose into highly conductive copper metal when annealed at above 250 ℃. The new nano ink was prepared by mixing copper carboxylate with copper complex nano particles of a mean size below 100 nm. The viscosity of the copper ink was in the range of 104–105 mPa s (at 50 rpm). The resistivity of the conductive film, after annealing under the condition of 3% H2 above 250 ℃ for 20 min, was below 10 μΩ cm and it could be further reduced to 4.4 μΩ cm when annealed at 320 ℃ for 20 min. We successfully demonstrated a printable copper nano ink that proceeds to form highly conductive metal film when annealed at low temperature on flexible substrates.
Hybrid Copper Complex-Derived Conductive Patterns Printed on Polyimide Substrates
Byoungyoon Lee,Sooncheol Jeong,Yoonhyun Kim,Inbum Jeong,Kyoohee Woo,문주호 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.3
We synthesized new copper complexes that can be readily converted into highly conductive Cu film. Mechano-chemical milling of copper (I) oxide suspended in formic acid resulted in the submicron-sized Cu formate together Cu nanoparticles. The submicrometer-sized Cu formates are reactive toward inter-particle sinter-ing and metallic Cu seeds present in the Cu complexes assist their decomposition and the nucleation of Cu. The hybrid copper complex film printed on polyimide substrate is decomposed into dense and uni-form Cu layer after annealing at 250°C for 30 min under nitrogen atmosphere. The resulting Cu film exhibited a low resistivity of 8.2 µΩ·cm and good adhesion characteristics.
Vascular plants of Poaceae (II) new to Korea: Holcus mollis L. and Aira elegantissima Schur
Cho, Yanghoon,Kim, Jonghwan,Lee, Byoungyoon The National Institute of Biological Resources 2017 Journal of species research Vol.6 No.2
Recent herbarium reexamination and field studies yielded two monocotyledonous plant taxa of the family Poaceae that could be documented in the national inventory list of species of Korea. These species, collected from Jeollabuk-do and Gyeongsangnam-do, were introduced and naturalized in Korea. Two species were identified as Holcus mollis L. and Aira elegantissima Schur. We provided the descriptions and descriptive photos of these species. Keys to the newly recorded species and related taxa were also provided.
Jang, Daehwan,Kim, Dongjo,Lee, Byoungyoon,Kim, Sungsoo,Kang, Minsoo,Min, Dongki,Moon, Jooho WILEY-VCH Verlag 2008 Advanced functional materials Vol.18 No.19
<P>Ink-jet printed metal nanoparticle films have been shown to anneal at high temperatures (above 500 °C) to highly conductive metal films on glass or ceramic substrates, but they suffer from cracking and inadequate substrate adhesion. Here, we report printable conductive materials, with added nanosized glass frit that can be annealed at 500 °C to form a crack-free dense microstructure that adheres well to glass substrates. This overcomes the previous challenges while still retaining the desired high film conductivity. Controlling the particle characteristics and dispersion behavior plays an important role in successfully incorporating the glass frit into the conductive inks.</P> <B>Graphic Abstract</B> <P>Silver nanoparticle-based printable ink suitable for high-temperature annealing is described. Incorporation of well-controlled nanosized glass frit leads to crack-free, dense, yet highly conductive patterns annealed at above 500 °C. The liquid phase of the glass forms when annealed above its glass transition temperature, promoting adhesion of the film to the substrate and reducing the volume shrinkage by filling the interstices between Ag nanoparticles. <img src='wiley_img/1616301X-2008-18-19-ADFM200800238-content.gif' alt='wiley_img/1616301X-2008-18-19-ADFM200800238-content'> </P>
Kang, Jong‐,Soo,Lee, Byoungyoon,Kwak, Myounghai John Wiley Sons Australia, Ltd 2017 Plant species biology Vol.32 No.4
<P>We isolated and characterized microsatellite loci in <I>Viola mirabilis</I> (Violaceae), an endangered species from South Korea. Twenty‐three polymorphic microsatellite loci were developed and tested in Korean, Chinese and Japanese populations. The number of alleles per locus varied from two to eight. The observed and expected heterozygosities within the three populations were 0.000–0.625 and 0.469–0.695, respectively. A total of six loci in the Korean population, one locus in the Chinese population and seven loci in the Japanese population deviated from Hardy–Weinberg equilibrium. We expect that these newly developed microsatellite markers will contribute to understanding the phylogeography and population genetics of <I>V. mirabilis</I>, which will aid in developing conservation strategies for this species.</P>
Cho, Yanghoon,Kim, Jonghwan,Han, Jeong Eun,Lee, Byoungyoon The National Institute of Biological Resources 2016 Journal of species research Vol.5 No.1
Recent field and herbarium studies have yielded three vascular plant taxa of the family Poaceae that have been documented in Korea. All of the three species, collected from Jeolla-do and adjacent areas, were introduced and naturalized. Three species are identified as Vulpia bromoides (L.) Gray, Agrostis capillaris L. and Eragrostis pectinacea (Michx.) Nees. We provide the descriptions and descriptive photos of these species. Keys to the newly recorded species and related taxa are also provided.
Jumin Jun,Sang Hoon Han,Tae-Jin Jeong,Hyun Chul Park,Byoungyoon Lee,Myounghai Kwak 한국유전학회 2011 Genes & Genomics Vol.33 No.6
To identify species based on samples without recognizable morphological characteristics, DNA-based approaches are the best option. Here, we describe two cases of the determination of species and geographical origin of wildlife specimens under the regulation of international treaties and domestic laws related to wildlife management in South Korea. First, hairs of suspected wild or reared endangered Asiatic black bears were analyzed using cytochrome oxidase I and the control region. Confiscated Felidae leathers were also investigated using cytochrome b, but they were proven to be fabricated canine leathers. These results were used as scientific evidence for wildlife-related law enforcement. Our results suggest that unrecognizable wildlife specimens can be identified efficiently using DNA sequence-based analysis. Finally, this study shows that conservation genetics research and its applications can be incorporated into wildlife forensic studies.
Grabovskaya-Borodina, Alisa E.,Illarionova, Irina D.,Jang, Hyun-Do,Lee, Byoungyoon,Suh, Min Hwan,Park, Jeong Mi The National Institute of Biological Resources 2018 Journal of species research Vol.7 No.1
The review provides the information about 46 type specimens on 35 taxa of vascular plants from Korea (Fig. 1), kept in the Herbarium of the Komarov Botanical Institute of the Russian Academy of Sciences in addition to 150 taxa published before. Lectotype of Ligustrum patulum Palib is designated here.