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Jang, Jum Suk,Ahn, Chang Won,Won, Sung Sik,Kim, Ju Hun,Choi, Wonyong,Lee, Byoung-Seob,Yoon, Jang-Hee,Kim, Hyun Gyu,Lee, Jae Sung American Chemical Society 2017 The Journal of Physical Chemistry Part C Vol.121 No.28
<P>Vertically aligned core-shell PbTiO3@TiO2 heterojunction nanotube arrays are fabricated on F:SnO2 (FTO) glass substrate via a unique three-step process: an electron beam vapor deposition of Ti thin film on FTO, anodic oxidation of the Ti film to TiO2 nanotubes, and finally formation of PbTiO3 perovskite layer at the inner wall of the TiO2 nanotubes. The PbTiO3@TiO2 nanotube array exhibits dramatically improved photoactivity relative to TiO2 nanotubes or PbTiO3/TiO2 composite powders in photoelectrochemical water splitting and photocatalytic isopropyl alcohol decomposition under visible light irradiation (>420 nm). In the core-shell heterojunction electrodes, PbTiO3 serves as a visible light responsive inorganic photosensitizer with its small band gap and forms a heterojunction with TiO2 for effective charge separation.</P>
A Composite Photocatalyst of CdS Nanoparticles Deposited on TiO<sub>2</sub> Nanosheets
Jang, Jum Suk,Choi, Sun Hee,Park, Hyunwoong,Choi, Wonyong,Lee, Jae Sung American Scientific Publishers 2006 Journal of Nanoscience and Nanotechnology Vol.6 No.11
<P>A nanocomposite photocatalyst consisting of deposited CdS nanoparticles on TiO2 nanosheets was fabricated by a simple one-pot method. The contact between two phases was maximized by making a composite structure of TiO2 nanosheet decorated with CdS nanoparticles. The composite photocatalyst showed higher photoactivity for hydrogen production from aqueous Na2S/Na2SO3 solution and decomposition of methylene blue under visible light irradiation (<I>λ</I> ≥ 420 nm) compared with single component CdS nanoparticles or a physical mixture of CdS nanoparticles and TiO2 nanorods. The intentional formation of nanoscale heterojunctions between two phases appears beneficial for inducing an efficient electron-hole separation.</P>
Jang, Jum Suk,Kim, Eun Sun,Kim, Hyun Gyu,Ji, Sang Min,Kim, Youngkwon,Lee, Jae Sung Cambridge University Press (Materials Research Soc 2010 Journal of materials research Vol.25 No.6
<P>Nitrogen-doped titania with a unique two-level hierarchical structure and visible light photocatalytic activity is reported. Thus, nitrogen-doped titanium oxide microrods decorated with N-doped titanium oxide nanosheets were synthesized by a hydrothermal reaction in NH4OH and postcalcination. During the calcination, the in situ incorporation of nitrogen atoms of ammonium ion into titania lattice was accompanied by the structural evolution from titanate to anatase titania. The morphological and structural evolution was monitored by scanning electron microscopy (SEM), x-ray diffraction (XRD), thermogravimetric analysis/differential thermal analysis (TGA/DTA), Raman, Fourier transform infrared (FTIR), x-ray absorption near edge structure (XANES), x-ray photoelectron spectroscopy (XPS), and adsorption isotherms. The N-doping brought visible light absorption, and the material exhibited high photocatalytic activity in the decomposition of Orange II under visible light irradiation (λ ≥ 400 nm), especially when it was loaded with 1 wt% Pt as a cocatalyst.</P>
Jang, Jum-Suk,Borse, Pramod H.,Lee, Jae-Sung,Jung, Ok-Sang,Cho, Chae-Ryong,Jeong, Euh-Duck,Ha, Myoung-Gyu,Won, Mi-Sook,Kim, Hyun-Gyu Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
Nanocrystalline Zn$Fe_2O_4$ oxide-semiconductor with spinel structure was synthesized by the polymerized complex (PC) method and investigated for its photocatalytic and photoelectric properties. The observation of a highly pure phase and a lower crystallization temperature in Zn$Fe_2O_4$ made by PC method is in total contrast to that was observed in Zn$Fe_2O_4$ prepared by the conventional solid-state reaction (SSR) method. The band gap of the nanocrystalline Zn$Fe_2O_4$ determined by UV-DRS was 1.90 eV (653 nm). The photocatalytic activity of Zn$Fe_2O_4$ prepared by PC method as investigated by the photo-decomposition of isopropyl alcohol (IPA) under visible light (${\geq}$ 420 nm) was much higher than that of the Zn$Fe_2O_4$ prepared by SSR as well as Ti$O_{2-x}N_x$. High photocatalytic activity of Zn$Fe_2O_4$ prepared by PC method was mainly due to its surface area, crystallinity and the dispersity of platinum metal over Zn$Fe_2O_4$.
Platinum-free tungsten carbides as an efficient counter electrode for dye sensitized solar cells
Jang, Jum Suk,Ham, Dong Jin,Ramasamy, Easwaramoorthi,Lee, Jinwoo,Lee, Jae Sung Royal Society of Chemistry 2010 Chemical communications Vol.46 No.45
<P>Mesoporous tungsten carbides displayed an excellent solar conversion efficiency (7.01%) as a counter electrode for dye sensitized solar cells under 100 mW cm<SUP>−2</SUP>, AM 1.5G illumination, which corresponded to <I>ca.</I> 85% of the efficiency of the conventional platinum electrode.</P> <P>Graphic Abstract</P><P>In this communication, we report mesoporous tungsten carbide as a Pt-free counter electrode for efficent DSSC. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc02247k'> </P>
Energy Band Structure and Photocatalytic Property of Fe-doped Zn<sub>2</sub>TiO<sub>4</sub> Material
Jang, Jum-Suk,Borse, Pramod H.,Lee, Jae-Sung,Lim, Kwon-Taek,Jung, Ok-Sang,Jeong, Euh-Duck,Bae, Jong-Seong,Won, Mi-Sook,Kim, Hyun-Gyu Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
$Zn_2Ti_{1-x}Fe_xO_4\;(0\;{\leq}\;x\;{\leq}\;0.7)$ photocatalysts were synthesized by polymerized complex (PC) method and investigated for its physico-chemical as well as optical properties. $Zn_2Ti_{1-x}Fe_xO_4$ can absorb not only UV light but also visible light region due to doping of Fe in the Ti site of $Zn_2TiO_4$ lattice because of the band transition from Fe 3d to the Fe 3d + Ti3d hybrid orbital. The photocatalytic activity of Fe doped $Zn_2TiO_4$ samples for hydrogen production under UV light irradiation decreased with an increase in Fe concentration in $Zn_2TiO_4$. Consequently, there exists an optimized concentration of iron for improved photocatalytic activity under visible light (${\lambda}{\leq}$420 nm)
Jang, Jum-Suk,Kwon, Min-Serk,Kim, Hyun-Gyu,Park, Jae-Wook,Lee, Jae-Sung Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
The titanate nanotube (TNT) was hydrothermally synthesized in 10 M NaOH aqueous solution at $150^{\circ}C$ for 72 h. Titanate nanotube with high surface area (292 $m^2$/g) is a good candidate as a support for catalytic reaction or organic synthesis. Palladium nanoparticles with an average size of $ca$. 3 nm were well dispersed onto the surface of TNT nanotubes. Palladium loaded catalyst with high surface area shows a highly efficient ${\alpha}$ alkylation of ketones with primary alcohols.
Jang, Jum Suk,Li, Wei,Oh, Se Hyuk,Lee, Jae Sung Elsevier 2006 Chemical physics letters Vol.425 No.4
<P><B>Graphical abstract</B></P><P>A new configuration model consisting of bulky CdS with high crystallinity decorated with nanosized TiO<SUB>2</SUB> particles. The possible role of TiO<SUB>2</SUB> nanoparticles is to provide sites for collecting the photoelectrons generated from CdS, enabling thereby an efficient electron–hole separation as depicted.</P><ce:figure id='figure.0010'></ce:figure> <P><B>Abstract</B></P><P>CdS/TiO<SUB>2</SUB> nano-bulk composite (NBC) photocatalyst of a new configuration consisting of bulky CdS with high crystallinity decorated with nanosized TiO<SUB>2</SUB> particles exhibited an unprecedented high rate of hydrogen production under visible light irradiation (<I>λ</I>⩾420nm) from water containing sulfide and sulfite ions as hole scavengers. The fabrication method of the composite photocatalysts was critical for their performance. It was demonstrated that this active composite photocatalyst could be applied for practical processes of simultaneous hydrogen production and H<SUB>2</SUB>S removal in the treatment of Claus plant tail gas streams or vents of hydrodesulfurization plants.</P>
Jang, Jum Suk,Choi, Sun Hee,Kim, Eun Sun,Lee, Jae Sung,Shin, Namsoo,Lee, Dong Ryeol Elsevier 2009 Chemical physics letters Vol.468 No.4
<P><B>Graphical abstract</B></P><P>Mn-doped ZnS hybrid crystals with two-dimensional platelet morphology exhibit an optimum photoluminescence at a Mn/Zn atomic ratio of 0.2. The effect of Mn concentration is attributed to change in the local structure around Mn.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>Mn-doped ZnS hybrid crystals with two-dimensional platelet morphology were prepared and their luminescence properties were studied with the variation of Mn concentration. The photoluminescence derived from Mn<SUP>2+</SUP> increased with increasing Mn concentration to <I>x</I>=0.2 in Zn<SUB>1−</SUB><I><SUB>x</SUB></I>Mn<I><SUB>x</SUB></I>S(en)<SUB>0.5</SUB> (en=ethylenediamine), but further increase reduced the photoluminescence. According to structural study by synchrotron X-ray techniques, the bond distances of Mn–N and Mn–S were longer than those of Zn–N and Zn–S in ZnS(en)<SUB>0.5</SUB>, respectively. Manganese atoms were most highly doped into tetrahedral Zn sites without impurities at <I>x</I>=0.2, where the maximum photoluminescence was observed.</P>
Photocatalytic performance of nanocrystalline Bi5Ti3FeO15 layered perovskite under visible light.
Jang, Jum Suk,Borse, Pramod H,Lee, Jae Sung,Lim, Kwon Taek,Cho, Chae Ryong,Jeong, Euh Duck,Ha, Myoung Gyu,Won, Mi Sook,Kim, Hyun Gyu American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.8
<P>Nanocrystalline Bi5Ti3FeO15 layered perovskite exhibiting Aurivillius phase was synthesized by polymerized complex (PC) method and investigated for its physico-chemical as well as optical properties. The crystallization of Bi5Ti3FeO15 synthesized by PC method was found to occur in the temperature range of 800-1050 degress C, whereas the single crystalline Bi5Ti3FeO15 formed at 1030 degrees C by solid state reaction (SSR) method. The observation of highly pure phase and such lower crystallization temperature in Bi5Ti3FeO15 prepared by PC method, is in total contrast to that observed in Bi5Ti3FeO15 prepared by the conventional solid-state reaction (SSR) method. The band gap of nanocrystalline Bi5Ti3FeO15 determined from UV-Vis diffusion reflectance spectrometer was 2.38 eV (525 nm). The photocatalytic activity of Pt/Bi5Ti3FeO15 prepared by PC method was investigated with the photodecomposition of isopropyl alcohol (IPA) and hydrogen production from water-methanol mixed solution under visible light (lambda > or = 420 nm). The respective activities for PC sample were higher than that of Pt/Bi5Ti3FeO15 prepared by SSR as well as Pt/TiO(2-x)N(x).</P>