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Hudaya, Chairul,Jeon, Bup Ju,Verdianto, Ariono,Lee, Joong Kee,Sung, Yung-Eun Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.490 No.-
<P><B>Abstract</B></P> <P>Antiglare and antireflection materials take considerable research attention due to its important role in transparent optical materials for various purposes. In this study, we employed layer-by-layer coating materials consist of SiO<SUB>2</SUB> and TiZrO<SUB>2</SUB> deposited on etched-surface glass substrate using dual electron beam evaporator system. The surface morphology investigated by using scanning electron microscopy (SEM) exhibited the microstructure patterns of glass surface. The cross-sectional image of transmission electron microscopy (TEM) showed uniformly layer-by-layer coating materials with the thickness of ~20–80 nm. The Auger electron spectroscopy (AES) revealed the depth profiles of elemental composition of surface layer-by-layer coating, confirming the presence of elements of SiO<SUB>2</SUB> and TiZrO<SUB>2</SUB> layers. In addition, the layer-by-layer coated glass surface performed the hydrophobic properties with contact angle of 69°. The microstructure surface treatment and layer-by-layer coating have successfully decreased the reflectance (~3%) and increased the transmittance of the treated glass (~91%), opening the possibility for the applications of any optical devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Layer-by-layer deposition of SiO<SUB>2</SUB> and TiZrO<SUB>2</SUB> as antiglare and antireflection </LI> <LI> Multilayer thin film coating with increased transmittance </LI> <LI> Microstructure patterns through surface etching with hydrophobic capability </LI> <LI> Homogeneous coating materials through dual electron beam evaporator </LI> <LI> Potential applications for PV panel, laser, optical lenses and display devices </LI> </UL> </P>
Hudaya, Chairul,Ahn, Minjeh,Oh, Si Hyoung,Jeon, Bup Ju,Sung, Yung-Eun,Lee, Joong Kee Elsevier 2018 Journal of industrial and engineering chemistry Vol.64 No.-
<P><B>Abstract</B></P> <P>Despite the advantage of chemical vapor deposition (CVD) for realization of large area epitaxial growth of graphene on transition metal catalysts, both etching and transfer process of CVD-grown graphene sheets still remain a big challenge. Here we demonstrate the formation of multilayer graphene (MLG) sheets tailored from C<SUB>60</SUB> thin films on the top of Si/Ni substrate without etching and transfer steps based on Ni films. This self-assembled process separates the MLG sheets from the conductive Ni catalyst, embarking a possibility for direct characterizations of MLG sheets. The fine-tuned C<SUB>60</SUB> films (30nm) are transformed into approximately 17 MLG sheets, thus making it large-area MLG sheets for a variety of direct applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hudaya, Chairul,Kang, Bongjo,Jung, Hun-Gi,Choi, Wonchang,Jeon, Bup Ju,Lee, Joong Kee Elsevier 2015 Carbon Vol.81 No.-
<P><B>Abstract</B></P> <P>A unique polymerized C<SUB>60</SUB> thin film was functionalized by radio frequency – plasma-assisted thermal evaporation as a passivation layer for the fluorine-doped tin oxide (SnO<SUB>2</SUB>:F) anode of a lithium-ion battery. The plasma-polymerized C<SUB>60</SUB> coated SnO<SUB>2</SUB>:F anode exhibited a high initial discharge capacity of 1255mAhg<SUP>−1</SUP> at 0.15mAcm<SUP>−2</SUP> and increased coulombic efficiency of 98%. These electrochemical improvements were due to the polymerized C<SUB>60</SUB> coating layer, which enhanced the transport of lithium ions on the surface of the active material and mechanically stabilized the anode material during electrochemical cycling.</P>
Simultaneous etching and transfer — Free multilayer graphene sheets derived from C60 thin films
Chairul Hudaya,안민제,오시형,전법주,성영은,이중기 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Despite the advantage of chemical vapor deposition (CVD) for realization of large area epitaxial growth ofgraphene on transition metal catalysts, both etching and transfer process of CVD-grown graphene sheetsstill remain a big challenge. Here we demonstrate the formation of multilayer graphene (MLG) sheetstailored from C60 thinfilms on the top of Si/Ni substrate without etching and transfer steps based on Nifilms. This self-assembled process separates the MLG sheets from the conductive Ni catalyst, embarking apossibility for direct characterizations of MLG sheets. Thefine-tuned C60 films (30 nm) are transformedinto approximately 17 MLG sheets, thus making it large-area MLG sheets for a variety of directapplications.
Portable Energy Storage System for DC House and Emergency Response in Indinesia
Chairul Hudaya,Dwi Riana Aryani,Yosca Rose Anggita Heatubun,Wahyu Taufiqurahman,Ariono Verdianto,Iwa Garniwa,성영은 적정기술학회 2019 적정기술학회지(Journal of Appropriate Technology) Vol.5 No.1
One of main problems in developing electricity grid for archipelago country like Indonesia is the geographical concerns as it consists of many islands. In some rural areas, electricity has not been available yet due to the limited infrastructure access, leading to high investment cost. In this study, a portable energy storage system based on the lithium-ion batteries called Tabung Listrik or TaLis (DC-based power bank) and DC house system were proposed as the solution for providing electricity for rural areas with relatively lower cost. TaLis is designed to be portable so it is easy to carry around as well as it can be used for many purposes. Since 2017, TaLis prototype has been used as the energy storage in a DC house sys- tem at Sekolah Master Indonesia, where an array of PV rooftop is functioned as the main DC power supply. Besides, some TaLis were also dispatched for emergency response during the disaster situations in Indonesia, such as during the measles outbreak in Asmat-Papua, the earthquake disaster in Lombok and tsunami in Palu.
Portable Energy Storage System for DC House and Emergency Response in Indonesia
Chairul Hudaya,Dwi Riana Aryani,Yosca Rose Anggita Heatubun,Wahyu Taufiqurahman,Ariono Verdianto,Iwa Garniwa,Yung-Eun Sung 적정기술학회 2019 적정기술학회지(Journal of Appropriate Technology) Vol.5 No.1
One of main problems in developing electricity grid for archipelago country like Indonesia is the geographical concerns as it consists of many islands. In some rural areas, electricity has not been available yet due to the limited infrastructure access, leading to high investment cost. In this study, a portable energy storage system based on the lithium-ion batteries called Tabung Listrik or TaLis (DC-based power bank) and DC house system were proposed as the solution for providing electricity for rural areas with relatively lower cost. TaLis is designed to be portable so it is easy to carry around as well as it can be used for many purposes. Since 2017, TaLis prototype has been used as the energy storage in a DC house system at Sekolah Master Indonesia, where an array of PV rooftop is functioned as the main DC power supply. Besides, some TaLis were also dispatched for emergency response during the disaster situations in Indonesia, such as during the measles outbreak in Asmat-Papua, the earthquake disaster in Lombok and tsunami in Palu.
ECR-MOCVD를 이용하여 연료 전지 분리판에 코팅된 FTO막의 특성 연구
박지훈,C. Hudaya,전법주,변동진,이중기 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.3
Polymer electrolyte membrane fuel cells (PEMFCs) use the bipolar plate of various materials between electrolyte and contact electrode for the stable hydrogen ion exchange activation. The bipolar plate of various materials has representatively graphite and stainless steel. Specially, stainless steels have advantage for low cost and high product rate. In this study, SUS 316 was effectively coated with 600 nm thick F-doped tin oxide (SnOx:F) by electron cyclotron resonance-metal organic chemical vapor deposition and investigated in simulated fuel cell bipolar plates. The results showed that an F-doped tin oxide (SnOx:F) coating enhanced the corrosion resistance of the alloys in fuel cell bipolar plates, though the substrate steel has a significant influence on the behavior of the coating. Coating SUS 316 for fuel cell bipolar plates steel further improved the already excellent corrosion resistance of this material. After coating, the increased ICR values of the coated steels compared to those of the fresh steels. The SnOx:F coating seems to add an additional resistance to the native air-formed film on these stainless steels.
Halim, Martin,Hudaya, Chairul,Kim, A-Young,Lee, Joong Kee The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.7
<▼1><P>Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite.</P></▼1><▼2><P>Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite. The kinetic processes at a SiOC anode result in rapid capacity fading even at a relatively low current density, thereby hindering its commercialization. Herein, a distinctive, phenyl-rich silicone oil is used as a precursor for producing SiOC anode materials <I>via</I> simple pyrolysis. We find that only silicone oil with phenyl-rich rings can be converted into SiOC materials. The phenyl group was crucial for carbon incorporation to allow Si–O–C bonding and the formation of a free-carbon phase. The resulting SiOC anode exhibited stable cyclability up to 250 cycles, with a discharge capacity of 800 mA h g<SUP>−1</SUP> at a current density of 200 mA g<SUP>−1</SUP>. The remarkable cycle performance of SiOC was correlated with its low dimensional expansion (7%) during lithiation, which maintains its structure over cycling. Rate capability tests showed a highly stable performance with a maximum discharge capacity of 852 mA h g<SUP>−1</SUP> at a current density of 100 mA g<SUP>−1</SUP>. When the discharge current density was increased 64-fold, the reversible capacity of the SiOC anode was 90% of its maximum capacity, 772 mA h g<SUP>−1</SUP>. The excellent electrochemical performance of SiOC could be attributed to the rapid mobility of Li<SUP>+</SUP> within the SiOC matrix, as indicated by a Li<SUP>+</SUP> diffusion coefficient of 5.1 × 10<SUP>−6</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP>.</P></▼2>
Park, Ji Hun,Hudaya, Chairul,Kim, A-Young,Rhee, Do Kyung,Yeo, Seon Ju,Choi, Wonchang,Yoo, Pil J.,Lee, Joong Kee The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.22
<P>Structurally regulated and hybridized Al–C nanoclusters are prepared from C<SUB>60</SUB> and Al precursors by thermal evaporation-combined plasma-enhanced chemical vapour deposition. The resulting Al–C hybrid nanoclustered anodes for Li-ion batteries exhibit a high reversible capacity of >900 mA h g<SUP>−1</SUP> at an optimized current density of 6 A g<SUP>−1</SUP> for over 100 cycles.</P> <P>Graphic Abstract</P><P>A gas-phase reaction between C<SUB>60</SUB> and Al affords nanoclustered hybrids for high capacity and high stability Li-ion battery anodes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc47900e'> </P>