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Adhesion Properties of Transparent DLC Films on Polymer Substrates
Chiaki Terashima,Sang-min Baek,Tatsuru Shirafuji,Nagahiro Saito,Osamu Takai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
Transparent diamond-like carbon thin films were synthesized by doping of silicon-oxide using pulse-biased inductively coupled plasma chemical vapor deposition. Optical properties, mechanical properties, and adhesion properties of these films on polymer substrates such as polycarbonate were investigated on the effects of the gas composition and plasma pre-treatment. Silicon-oxide incorporated diamond-like carbon films on polycarbonate had favorable properties of higher deposition rate and wider optical band gap, although too much oxygen incorporation (O/C ratio > 0.15) brought about poor adhesion strength.
Synthesis of cerium and nickel doped titanium nanofibers for hydrolysis of sodium borohydride
Tamboli, Ashif H.,Gosavi, S.W.,Terashima, Chiaki,Fujishima, Akira,Pawar, Atul A.,Kim, Hern Elsevier 2018 CHEMOSPHERE - Vol.202 No.-
<P><B>Abstract</B></P> <P>A recyclable titanium nanofibers, doped with cerium and nickel doped was successfully synthesized by using sol-gel and electrospinning method for hydrogen generation from alkali free hydrolysis of NaBH<SUB>4</SUB>. The resultant nanocomposite was characterized to find out the structural and physical-chemical properties by a series of analytical techniques such as FT-IR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscope), EDX (energy-dispersive X-ray spectroscopy),N<SUB>2</SUB> adsorption-desorption and BET (Brunauer–Emmett–Teller), etc. The results revealed that cerium and nickel nanoparticles were homogeneously distributed on the surface of the TiO<SUB>2</SUB> nanofibers due to having similar oxidation state and atomic radium of TiO<SUB>2</SUB>nanofibers with CeO<SUB>2</SUB> and NiO for the effective immobilization of metal ions. The NiO doped catalyst showed superior catalytic performance towards the hydrolysis reaction of NaBH<SUB>4</SUB> at room temperature. These catalysts have ability to produce 305 mL of H<SUB>2</SUB> within the time of 160 min at room temperature. Additionally, reusability test revealed that the catalyst is active even after five runs of hydrolytic reaction, implying the as-prepared NiO doped TiO<SUB>2</SUB> nanofibers could be considered as a potential candidate catalyst for portable hydrogen fuel system such as PEMFC (proton exchange membrane fuel cells).</P> <P><B>Highlights</B></P> <P> <UL> <LI> A recyclable metal doped TiO<SUB>2</SUB> electrospun nanofibers was successfully synthesized. </LI> <LI> Beadles nanofibers and uniform distribution of doped metal facilitate stability to catalyst. </LI> <LI> The metal doped catalyst showed superior activity for hydrolysis of NaBH<SUB>4</SUB>. </LI> <LI> The metal doped TiO<SUB>2</SUB> catalyst could be used repeatedly without significant loss in activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Choi, Junghyun,Song, Taeseup,Kwon, Jiseok,Lee, Sangkyu,Han, Hyungkyu,Roy, Nitish,Terashima, Chiaki,Fujishima, Akira,Paik, Ungyu,Pitchaimuthu, Sudhagar Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.447 No.-
<P><B>Abstract</B></P> <P>Producing clean fuel (O<SUB>2</SUB> and H<SUB>2</SUB>) using semiconductors through solar driven water splitting process has been considered as a promising technology to mitigate the existing environmental issues. Unlike the conventional single photoabsorbers, heterostructured semiconductors exhibit the merits of improved solar light photon harvesting and rapid charge separation, which are anticipated to result in high quantum yield of solar fuel generation in photoelectrochemical (PEC) cells. In this report, we demonstrate the electrospun derived WO<SUB>3</SUB> backbone fibrous channel as heteropartner to the primary photoabsorber (Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB>) for promoting the electron transport from charge injection point to charge collector as well as photoholes to the electrolyte. We examine structure, optical, photoelectrochemical and charge transfer property of Fe<SUB>2</SUB>O<SUB>3</SUB>/WO<SUB>3</SUB> and BiVO<SUB>4</SUB>/WO<SUB>3</SUB> electrodes. These results were compared with directly coated Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB> photoabsorber onto conducting substrate without WO<SUB>3</SUB> backbone. The optical results showed that the absorbance and visible light activity of Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB> is significantly improved by WO<SUB>3</SUB> backbone fibers due to high amount of photo absorber loading. In addition, one dimensional (1-D) WO<SUB>3</SUB> fibers beneficially enhance the optical path length to the photoanode through light scattering mechanism. The electrochemical impedance analysis exhibits WO<SUB>3</SUB> nanofiber backbone reduces charge transfer resistance at Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB> by rapid charge collection and charge separation compare to backbone-free Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB>. As a result, Fe<SUB>2</SUB>O<SUB>3</SUB>/WO<SUB>3</SUB> and BiVO<SUB>4</SUB>/WO<SUB>3</SUB> fibrous hetero interface structures showed fourfold higher photocurrent generation from PEC cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sol-gel spin coated Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB> thin films onto WO<SUB>3</SUB> fiber is demonstrated. </LI> <LI> Light absorbance promoted at Fe<SUB>2</SUB>O<SUB>3</SUB> and BiVO<SUB>4</SUB> by introducing WO<SUB>3</SUB> nanofibrous. </LI> <LI> Charge transfer at Fe<SUB>2</SUB>O<SUB>3</SUB>, BiVO<SUB>4</SUB> photoanode/electrolyte interfaces is examined. </LI> <LI> Role of 1-D WO<SUB>3</SUB> fibrous backbone scaffold in solar fuel generation is explored. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yang, Yongtak,Oh, Jeong-Wook,Kim, Yang-Rae,Terashima, Chiaki,Fujishima, Akira,Kim, Jong Seung,Kim, Hasuck Royal Society of Chemistry 2010 Chemical communications Vol.46 No.31
<P>Significant enhancement of the ECL signals from the Ru(bpy)<SUB>3</SUB><SUP>2+</SUP>/TPA system was achieved when using a BDD nanograss array, mainly because of the highly facile oxidation of TPA. The facile oxidation of TPA is due to the superior properties of the BDD nanograss array, such as improved electrocatalytic activity and accelerated electron transfer.</P> <P>Graphic Abstract</P><P>Significant enhancement of the ECL signals from the Ru(bpy)<SUB>3</SUB><SUP>2+</SUP>/TPA system was achieved when using a BDD nanograss array, mainly because of the highly facile oxidation of TPA. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc00773k'> </P>