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A Systematic Study on Preparing the CdS Quantum Dots
Buithehuy,Min-Ho Seo,임재민,신동수,이용일,김상수,Ki-wan Jang,송태권 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
Quantum dots (QDs) have been attracting researchers?attention because of their potentials to be used as nanotechnology key components. In this work, we report the systematic study of synthesis process for making compound semiconductor QDs in 1-octadecene. The synthetic QDs were characterized by the photoluminescence and absorption spectra and TEM, XRD analysis. The average size of the nanocrystals is 3.7 - 4.5 nm by the investigation from their absorption spectra and TEM images. 1-Octadecene facilitates nucleation by providing an available source of sulfite and the excess of oleic acid may lead to cationic monomer excess. The samples show excitonic luminescence and brightness in the range 420 ?460 nm. These results indicate that we can control the diameter of CdS QDs, which were synthesized in the ODE. The synthesized semiconductor QDs will be used as fluorescence marker.
이성수,Buithehuy,Nguyen Thi Kim Phuong,Do Khanh Tung,이용일 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
In order to make long-lived photoexcited charges for efficient catalytic photodegradation, rare earth elements are often incorporated into semiconductors. We studied the doping effect on photodegradation efficiency of Bi2WO6 samples with europium ions which were successfully synthesized by a simple one-step. The prepared catalyst was characterized by multiple techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic activities of pristine Bi2WO6 and xEu-Bi2WO6 (x=1, 2, 3, and 4) were investigated in the presence of H2O2 for 2,4,5-Trichlorophenoxyacetic acid (2,4,5-T) as a target contaminant under visible light irradiation. The incorporation of Eu3+ into Bi2WO6 where Eu3+ ion played the role of an electron acceptor was favorable for transferring photoinduced electrons from Bi2WO6 to Eu3+, thereby increasing separation efficiency of photoinduced electron-hole, leading to enhanced photocatalytic activity of xEu-Bi2WO6. Under optimized condition, the photodegradation efficiency of 2,4,5-T by 2Eu-Bi2WO6 samples was 1.7-fold higher than that of pristine Bi2WO6 sample. We demonstrate that Eu3+ ion is a promising candidate for the development of a visible-light active semiconductor catalyst for environmental remediation.
Nguyen Ngoc Nghia,Buithehuy,Yong-Ill Lee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
A simple colorimetric method was proposed for the determination of folic acid (FA) using a paper-basedsubstrate. The mechanism of the folic acid probe is based on the improvement of electron transfer fromthe rhodamine B derivative to Cu2+ in the presence of folic acid. Upon the addition of folic acid, thestructural conversion of the rhodamine B derivative, in which the spirolactam ring (colorless) was openedlittle to the open-ring form (pink color) by Cu2+, was amplified clearly. The change of color intensity canbe observed by either UV–vis spectrophotometer or naked eye. The color of the paper-based substratewas analyzed using the red, green, blue (RGB) values, which were collected from images captured witha smartphone application. The folic acid paper-based probe exhibited good linearity in the range of40–260 nM with a limit of detection (LOD) of 22 nM. The proposed probe exhibits a high potential fordetecting folic acid in real samples including drug tablets, human serum, and urine.
쭈옹 티 투이,Buithehuy,Avvaru Praveen Kumar,이용일 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
The overuse of antibiotics increases resistant bacteria, and their accumulation in the human body resultingin a pernicious influence or allergic effect on human health. As antibiotics have been used in livestock,their residue in food products is a serious problem. Therefore, the determination of tetracycline (TC) – anantibiotic in food samples by a simple, highly sensitive technique is necessary. This report presents a fluorescencesensor to detect TC based on fluorescence quenching by inner filter effect (IFE) between TC andCs4PbBr6/CsPbBr3 perovskite material. Cs4PbBr6/CsPbBr3 acts as a fluorescence source with high luminescencequantum yield, narrow emission peak, and short radiative lifetime. It is also protected byperofluorooctyltriethyloxylsilane fluorocarbons assembled on the particle surface to form a waterresistancelayer due to the high hydrophobic groups, –CF2– and –CF3, resulting in high aqueous dispersion. Under optimized conditions, the proposed sensor showed high sensitivity and selectivity to detectTC in food samples. The limit of detection is calculated as 76 nM with a linear range of 0.4 – 10 mM. Thefluorescence quenching mechanism is assigned to IFE based on the excitation spectrum of Cs4PbBr6/CsPbBr3 and the absorption spectrum of TC, as well as the compensatory fluorescence intensity ofCs4PbBr6/CsPbBr3 with the energy absorbed by TC concentration.
Salah M. Tawfik,Mirkomil Sharipov,Buithehuy,Zayakhuu Gerelkhuu,Dana Biechele-Speziale,이용일 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Naturally modified nonionic alginate-based polymers were synthesized to act as functionalizing agentsfor upconversion nanoparticles (UCNPs). The synthesized polymer-UCNPs hybrid nanoparticles showhigh stability, excellent biocompatibility and enhanced luminescence intensity for NIR imaging. Additionally, our results show that due to the large cavities of the materials and amphiphilic polymershell, these nonionic alginate-functionalized UCNPs were able to load the anticancer drug doxorubicin(DOX) with the exceptional efficiency as well as release it in a highly controlled and selectivepH-responsive manner via folate receptor-mediated endocytosis. Targeting using this multifunctionpolymer significantly improved the capability of DOX-loaded UCNPs to inhibit the growth of KB cancercells than free DOX. These biocompatible nonionic alginate-functionalized UCNPs hold substantialpotential as effective anticancer drug-delivery carriers and NIR imaging agents.