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Peptide directed synthesis of silica coated gold nanocables
Kim, Jungok,Myung, Nosang V.,Hur, Hor-Gil Royal Society of Chemistry 2010 Chemical communications Vol.46 No.24
<P>Here we report a peptide directed synthesis of co-shell nanocables by sequential guide formation of silica insulating shells on metallic gold nanoribbons which is significant since it demonstrated the ability to fabricate a functional nano-electronic component using a biomimetic method.</P> <P>Graphic Abstract</P><P>Peptide directed synthesis of co-shell nanocables by sequential guide formation of silica insulating shells on metallic gold nanoribbons is demonstrated here. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc00408a'> </P>
Electrical/Thermoelectric Characterization of Electrodeposited BixSb2-xTe3 Thin Films
In-Joon Yoo,임동찬,Nosang V. Myung,정영근,김양도,이규환,임재홍 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
BixSb2-xTe3 films were electrodeposited potentiostatically from acidic nitric baths at room temperature by controlling the electrodeposition parameters (i.e., the applied potential). Nearly stoichiometric BixSb2-xTe3 thin films were obtained at applied potentials between −0.10 and −0.15 V versus the saturated calomel electrode (SCE). The electrical and thermoelectric properties of the as-deposited films were degraded at more negative deposition potentials; this might be attributed to the greater defect density formed. The post-annealing process in the reducing environment improved the electrical and thermoelectric properties, possibly because of a decrease in antistructure defects.
한요셉,임영우,이규환,김현정,Nosang V. Myung 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Orthorhombic molybdenum trioxide (α-MoO3) nanofibers with controlled morphology and diameter were synthesized by adjusting electrospinning and calcination conditions. Experimental design was utilized to vary several factors including solution properties, electrospinning parameters and environmental conditions to analyze their effects toward nanofiber morphology (i.e., diameter and bead density). Polyvinylpyrrolidone (PVP) content, which effects viscosity, predominated control morphology of nanofibers where low PVP content (i.e., 3.0 wt.%) yielded heavily beaded nanofibers with smaller diameter. The morphology of nanofibers was also tuned by adjusting electrospinning parameters (i.e., applied voltage and feed rate), where smallest nanofibers with minimum bead density was achieved at applied voltage of 8 kV with feed rate of 0.5 mL/h. The as-electrospun ammonium molybdate/polyvinylpyrrolidone nanofibers were calcined to α-MoO3 nanofibers in air. The ramping rate significantly altered the morphology of α-MoO3 nanofibers where rapid thermal annealing with the ramping rate of 15 °C/s yielded smoother nanofibers whereas slower ramping rate yielded platelet-like structures. BET analysis showed an increase in specific surface area with decreasing average diameter (i.e., 6.7 m2/g for 125 nm–86.4 m2/g for 35 nm).
Corrosion behaviors of plasma electrolytic oxidation (PEO) treated highsilicon aluminum alloys
박덕용,장충현,오용준,Nosang V. Myung,유봉영 한국표면공학회 2022 한국표면공학회지 Vol.55 No.3
Ceramic oxide layers successfully were formed on the surface of cast Al alloys with high Si contentsusing plasma electrolytic oxidation (PEO) process in electrolytes containing Na2SiO3, NaOH, andadditives. The microstructure of the oxide layers was systematically analyzed using scanning electronmicroscopy (SEM), cross-sectional transmission electron microscopy (TEM), X-ray diffraction patterns(XRD), and energy X-ray dispersive spectroscopy (EDS). XRD analysis indicated that the PEO untreatedhigh-silicon Al alloys (i.e., 17.1 and 11.7 wt.% Si) consist of Al, Si and Al2Cu phases whereas Al2Cu phaseselectively disappeared after PEO treatment. PEO process yielded an amorphous oxide layer with fewsecond phases including γ-Al2O3 and Fe-rich phases. The corrosion behaviors of high-silicon Al alloystreated by PEO process were investigated using electrochemical impedance spectroscopy (EIS) andother electrochemical techniques (i.e., open circuit potential and polarization curve). Electroanalyticalstudies indicated that high-silicon Al alloys treated by PEO process have greater corrosion resistancethan high-silicon alloys untreated by PEO process.
서호영,Hyunsung Jung,Nosang V. Myung,홍기민 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.11
Bamboo-like Te nanotubes were synthesized via the galvanic displacement reaction of NiFe nanowires with Ni-rich and Fe-rich segments. The thick and thin components of the synthesized Te nanotubes were converted from the Ni-rich and Fe-rich segments in the NiFe nanowires respectively. The dimensions of the Te nanotubes were controlled by employing sacrificial NiFe nanowires with tailored dimensions as the template for the galvanic displacement reaction. The segment lengths of the Te nanotubes were found to be dependent on those of the sacrificial NiFe nanowires. The galvanic displacement reaction was characterized by analyzing the open circuit potential and the corrosion resistance.