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Synthesis and Quality of Cr-doped AlN Thin Films Grown by RF Sputtering
Pham Hong Quang,Tran Quang Hung,Ngo Xuan Dai,Tran Hoai Thanh,Kim CheolGi 한국자기학회 2007 Journal of Magnetics Vol.12 No.4
The AlCrN films were grown by RF reactive sputtering method under the selected conditions. The Cr concentration was varied by the number of Cr pieces placed on the Al target. The sample quality has been studied by XRD, Auger spectroscopy, optical absorption and electrical resistant measurements. The XRD and Auger results show that the samples consist of a major phase with the Al1-xCrxN formula, which has a hexagonal structure, and a few percents at. of oxygen, which may form Al₂O₃. There exist the Cr clusters in the samples with high concentration of Cr. The optical absorption measurement provides the information about the band gap that relates strongly to the quality of samples. The quality of samples is also clearly reflected in electrical measurement, i.e., the temperature dependence of resistance exhibits a semiconductor characteristic only for the samples that have no Cr cluster. In these cases, the values of ionization energies Ea can be derived from R(T) plots by using the function R(T) = Ro exp (Ea/kBT).
Hung, Pham Tien,Hien, Vu Xuan,Hoat, Phung Dinh,Lee, Sangwook,Lee, Joon-Hyung,Kim, Jeong-Joo,Heo, Young-Woo Elsevier 2019 Scripta materialia Vol.172 No.-
<P><B>Abstract</B></P> <P>Herein we report on the growth of layered BiI<SUB>3</SUB> nanoplates materials and their sensing properties of NO<SUB>2</SUB> under violet light illumination. The BiI<SUB>3</SUB> nanoplates were grown on a glass substrate using a chemical vapor deposition (CVD) system, with an average thickness of 30 nm and the lateral dimension of 150–170 nm. Their photo-induced sensing response for 20 ppm NO<SUB>2</SUB> and the response/recovery time are approximately ~11.2% and 18/36 s, respectively. The limit of detection (LOD) of NO<SUB>2</SUB> for the BiI<SUB>3</SUB> sensor is 25 ppb. A possible light-induced gas-sensing mechanism was proposed and investigated for the BiI<SUB>3</SUB> nanoplate.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Pham, Xuan-Hung,Hahm, Eunil,Huynh, Kim-Hung,Son, Byung Sung,Kim, Hyung-Mo,Jeong, Dae Hong,Jun, Bong-Hyun MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.19
<P>In this study, SiO2@Au@4-MBA@Ag (4-mercaptobenzoic acid labeled gold-silver-alloy-embedded silica nanoparticles) nanomaterials were investigated for the detection of thiram, a pesticide. First, the presence of Au@4-MBA@Ag alloys on the surface of SiO2 was confirmed by the broad bands of ultraviolet-visible spectra in the range of 320-800 nm. The effect of the 4-MBA (4-mercaptobenzoic acid) concentration on the Ag shell deposition and its intrinsic SERS (surface-enhanced Raman scattering) signal was also studied. Ag shells were well coated on SiO2@Au@4-MBA in the range of 1-1000 µM. The SERS intensity of thiram-incubated SiO2@Au@4-MBA@Ag achieved the highest value by incubation with 500 µL thiram for 30 min, and SERS was measured at 200 µg/mL SiO2@Au@4-MBA@Ag. Finally, the SERS intensity of thiram at 560 cm−1 increased proportionally with the increase in thiram concentration in the range of 240-2400 ppb, with a limit of detection (LOD) of 72 ppb.</P>
Facile Synthesis of Cubic Magnetic Up-Conversion Nanoparticles
Xuan-Hung Pham,Won-Yeop Rho,김형모,함은일,강은지,Michael M. Murata,전봉현 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.7
Efficient methods for fabricating multifunctional nanoparticles can expand the range of their applications in biomedicine. Therefore, in this study, a mild synthesis method for cubic magnetic up-conversion nanoparticles (MUCNPs) was explored. The MUCNPs were prepared at 160 °C and exhibited fluorescence when irradiated using a 915?nm wavelength laser along with magnetic properties. The MUCNPs exhibited higher intensity of fluorescence than UCNPs without any addition of magnetic nanoparticles. Moreover, MUNCPs exhibiting fluorescence with three different colors, namely green, yellow, and blue were successfully prepared using different Yb:Er ratios and by replacing Er with Tm; these nanoparticles can be useful for biomedical applications such as in therapies involving single nanosystems.
Proposal of Cross-platform Real-time Open Messaging System(ROMS) with Apache Cordova
Xuan-Qui Pham(팜소안쿠이),Pham Phuoc Hung(밤복홍),Ton Thi Kim Loan(톤띠김롼),Nguyen Dao Tan Tri(누엔다우탄틸리),Huu-Quoc Nguyen(누엔훠쿠크),Aymen Abdullah Alsaffar(아이만압둘라알사파르),Yunkon Kim(김윤곤),Eui-Nam Huh(허의남) 한국정보과학회 2015 한국정보과학회 학술발표논문집 Vol.2015 No.6
Degradation of Coatings under Atmospheric Tropical Conditions
Hang, To Thi Xuan,Vu, Pham Gia,Oanh, Vu Ke,Truc, Trinh Anh,Kodama, Toshiaki,Tanabe, Hiroyuki,Taki, Tohru,Nagai, Masanori 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.5
The weather resistance of five coatings systems based on alkyd, chlorinated rubber, epoxy, polyurethane and fluoropolymer were studied by natural exposure test and accelerated test. The coatings were exposed at Hanoi station with urban industry atmosphere and at Baichay stationwith marine atmosphere. The degradation of coatings was evaluated by gloss measurement and surface analysis by scanning clcctronic microscopy. The results obtained show that among coatings tested the gloss of polyurethane and tluoropolymer coatings remained highly and those of alkyd chlorinated rubber and epoxy coatings were very low afler two years of atmospheric exposure. Under accelerating conditions the gloss of fluoropolymer coatings remained highly after 80 cycles of testing. By compxison with accelerating test in UV-condensation chamber the conditions at atmospheric stations are more aggressive.
A self-encapsulated porous Sb-C nanocomposite anode with excellent Na-ion storage performance
Pham, Xuan-Manh,Ngo, Duc Tung,Le, Hang T. T.,Didwal, Pravin N.,Verma, Rakesh,Min, Chan-Woo,Park, Choong-Nyeon,Park, Chan-Jin The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.41
<P>In this study, a self-encapsulated Sb-C nanocomposite as an anode material for sodium-ion batteries (SIBs) was successfully synthesised using an SbCl3-citrate complex precursor, followed by a drying and calcination process under an inert N2 atmosphere. When the molar ratio of SbCl3 to citric acid was varied from 1 : 1 to 1 : 4, the Sb-C nanocomposite with a molar ratio of 1 : 3 (Sb-C3) exhibited the highest specific surface area (265.97 m<SUP>2</SUP> g<SUP>−1</SUP>) and pore volume (0.158 cm<SUP>3</SUP> g<SUP>−1</SUP>). Furthermore, the Sb-C3 electrode showed a high reversible capacity of 559 mA h g<SUP>−1</SUP> at a rate of C/10 and maintained a high reversible capacity of 430 mA h g<SUP>−1</SUP> even after 195 cycles at a rate of 1C. The Sb-C3 electrode exhibited an excellent rate capability of 603, 445, and 357 mA h g<SUP>−1</SUP> at the rates of C/20, 5C, and 10C, respectively. Furthermore, a full cell composed of an Sb-C3 anode and a Na3V2(PO4)3 cathode exhibited good specific capacity and cyclability, making the Sb-C composite a promising anode material for high-performance SIBs.</P>
Facile Method for Preparation of Silica Coated Monodisperse Superparamagnetic Microspheres
Pham, Xuan-Hung,Kyeong, San,Jang, Jaein,Kim, Hyung-Mo,Kim, Jaehi,Jung, Seunho,Lee, Yoon-Sik,Jun, Bong-Hyun,Chung, Woo-Jae Hindawi Limited 2016 Journal of nanomaterials Vol.2016 No.-
<P>This paper presents a facile method for preparation of silica coated monodisperse superparamagnetic microsphere. Herein, monodisperse porous polystyrene-divinylbenzene microbeads were prepared by seeded emulsion polymerization and subsequently sulfonated with acetic acid/H2SO4. The as-prepared sulfonated macroporous beads were magnetized in presence of Fe<SUP>2+</SUP>/Fe<SUP>3+</SUP>under alkaline condition and were subjected to silica coating by sol-gel process, providing water compatibility, easily modifiable surface form, and chemical stability. FE-SEM, TEM, FT-IR, and TGA were employed to characterize the silica coated monodisperse magnetic beads (~7.5 <I>μ</I>m). The proposed monodisperse magnetic beads can be used as mobile solid phase particles candidate for protein and DNA separation.</P>