http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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>
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.
Hydrazine detection by shape-controlled palladium nanostructures on carbon nanotube thin films
Xuan-Hung Pham,Minh-Phuong Ngoc Bui,Cheng Ai Li,한귀남,Muhammad Irfan,홍명효,성기훈 한국바이오칩학회 2013 BioChip Journal Vol.7 No.2
In this article, the electrodeposition of palladium (Pd) nanostructures on flexible and transparent single-walled carbon nanotube (SWCNT) thin films was described. Four different morphologies of Pd nanostructures were synthesized by controlling the potentials. Octahedral-like and flower-like nanostructures were observed at +0.3V and -0.1V, respectively. With a further driving potential decrease, cubic and spherical nanostructures were obtained in turn at 0.0V and -0.5V. The Pd nanostructures were confirmed by XRD data. Subsequently, the fabricated Pd nanostructures on SWCNT thin films were employed as electrodes for hydrazine detection. The electrochemical oxidation of hydrazine by Pd nanostructures was investigated by cyclic voltammetry and amperometry. As results, the specific sensitivities of four Pd nanostructures were 1123 μA mM cm-2 (octahedron), 899 μA mM cm-2 (flower), 827 μA mM cm-2 (cube), and 275μA mM cm-2 (sphere). The detection limits were 5.90μM (octahedron), 2.56 μM (flower), 2.85 μM (cube),and 4.83 μM (sphere).The morphology effect of Pd nanostructures on hydrazine oxidation is dependent on the relative fraction of (100), (110), and (111) facets which are associated with the shape. The (111) facet dominant Pd nanostructures exhibited the higher catalytic activities than Pd nanostructures with (100) and (110) facets.
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>
Xuan-Hung Pham,함은일,Kim-Hung Huynh,Byung Sung Son,김형모,전봉현 한국바이오칩학회 2020 BioChip Journal Vol.14 No.2
The use of colorimetric bioassays for protein detection is one of the most promising diagnostic approaches, but their relatively poor detection limits have been a critical issue. In this study, we developed an efficient colorimetric bioassay based on antibody-coated peroxidase-mimicking Au nanoparticles (Au NPs) for the detection of prostate-specific antigen (PSA), which is one of the most widely used protein biomarkers for the diagnosis of prostate and breast cancers. Anti-PSA antibody adsorption on the Au NP surface result in 65% of the peroxidasemimicking properties of Au NPs was suppressed to maximize sensitivity of the assay. Anti-PSA antibody adsorption on the Au NP was optimized at 150 µg/mL anti-PSA4 antibody for 1 h incubation, and their surface was blocked with 2% BSA. The experimental conditions of the immunoassay detection were also investigated. A highest assay value was obtained at 10 µg/mL anti-PSA1 capture antibody using 3% BSA for surface blocking and at 2.5 pM anti- PSA4-Ab coated Au NPs for 1 h incubation with PSA antigen. As a result, PSA was detected at a wide range of 0.25 to 2,500 ng/mL with a detection limit of 0.23 ng/mL. The anti-PSA-Ab coated Au NP- based assay was simple, easy to operate, and sensitive. The proposed peroxidase-mimicking anti-PSA Ab-coated Au NPbased assay could be further developed to detect other protein biomarkers.
Graphene Oxide Conjugated Magnetic Beads for RNA Extraction
Pham, Xuan-Hung,Baek, Ahruem,Kim, Tae Han,Lee, Sang Hun,Rho, Won-Yeop,Chung, Woo-Jae,Kim, Dong-Eun,Jun, Bong-Hyun Wiley (John WileySons) 2017 Chemistry - An Asian Journal Vol.12 No.15
<P>A magnetic material that consists of silicacoated magnetic beads conjugated with graphene oxide (GO) was successfully prepared for facile ribonucleic acid (RNA) extraction. When the GO-modified magnetic beads were applied to separate the RNA from the lysed cell, the cellular RNAs were readily adsorbed to and readily desorbed from the surface of the GO-modified magnetic beads by urea. The amount of RNA extracted by the GO-modified magnetic beads was approximate to 170% as much as those of the control extracted by a conventional phenol-based chaotropic solution. These results demonstrate that the facile method of RNA separation by using GO-modified magnetic beads as an adsorbent is an efficient and simple way to purify intact cellular RNAs and/or microRNA from cell lysates.</P>
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).
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