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Hongyi Qin,Yinhua Jin,Tao Gong,조유진,안치성,신철민,이창구,김태성 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.4
A novel conducting copolymer based on amidoxime groups, polypyrrole and graphene oxide was synthesized by in situ copolymerization by usin g two monomers. The monomer, amidoxime-pyrrole, was synthesized by amidoximation of 1-(2-cyanoethyl) pyrrole. The other monomer, GO-pyrrole, was prepared via esterification between –COOH of GO and –NH2 of 1-(3-aminopropyl) pyrrole. The conductive ability of the copolymer was based on conductive π-conjugated system of polypyrrole backbone. The copolymer was able to be used as an effective sorption material for the preconcentration and recovery of uranium. The maximum of adsorption capacity for uranyl ion is as high as 149.57 mg/g.
A novel optical aerosol detector utilizing an optic fiber with conductive polymer coating
Qin, Hongyi,Kulkarni, Atul,Zhang, Hang,Jiang, Dong,Kim, Taesung Elsevier 2012 Journal of aerosol science Vol.45 No.-
<P><B>Abstract</B></P><P>The detection of atmospheric aerosol particles is becoming an important issue in many fields such as environmental science, occupational medicine, semiconductor industry and material science. In the present paper, we utilized the conductive polymer, polypyrrole (PPy), as a sensitive membrane for detecting aerosol particles optically. A polymer optical fiber reflectance probe is constructed by depositing the PPy nanofilm at the end face of the fiber. The sensor principle relies on the change in the refractive index of the PPy nanofilm upon its interaction with aerosol nanoparticles and on the electrostatic induction between aerosol particles and the PPy nanofilm, which leads to a change in the reflected intensity. For preliminary evaluation of optical aerosol detector, three types of aerosol particles, NaCl, black carbon (BC) and polystyrene latex (PSL), are selected. The fabricated fiber optic reflectance probe using the PPy nanofilm shows distinct variations in the reflected light intensity depending on the type of aerosol particle and its properties. The proposed sensing approach may promote the use of conductive polymers in optical techniques for the detection of atmospheric aerosols.</P> <P><B>Highlights</B></P><P>► A novel optical fiber sensor based on the polypyrrole nanofilm for aerosol detection. ► The electrostatic induction between aerosol particles and polypyrrole nanofilm is utilized as the detection mechanism. ► This novel optical detection approach shows a good sensitivity for the aerosol detection.</P>
Chemical Amination via Cycloaddition of Graphene for Use in a Glucose Sensor
Qin, Hongyi,Hwang, Taehyun,Ahn, Chisung,Kim, Jang Ah,Jin, Yinhua,Cho, Yujin,Shin, Cheolmin,Kim, Taesung American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Graphene was chemically aminated via cycloaddition. Aziridine-ring linkages were formed by covalently modifying the C-C double bonds in graphene. The aminated graphene presents an enhanced hydrophilicity, the contact angle with water decreases from 80.5 degrees to 58.5 degrees. And the conductivity of aminated graphene exhibits exponential decay as the reaction time increase. If the reaction time is 90 min, the resistance of aminated graphene was increased from similar to 32 Omega to similar to 2744 Omega. Because the amino group has good biocompatibility, the aminated graphene is designed for use as an enzyme sensor platform, such as glucose sensor based on glucose oxidase. The aminated graphene exhibited a good detection response for glucose. The increase in device current is about 12% in 1.2 mg/mL glucose solution.</P>
Hongyi Li,Hong Qin 한국통계학회 2021 Journal of the Korean Statistical Society Vol.50 No.2
Level permutations of factors can improve space-filling properties of designs, and the properties of the three-level Triple designs constructed by tripling method are related to original designs. In this paper, a new strategy for tripling is provided for constructing three-level uniform designs. By considering all possible level permutations of factors, the relationship is built between the average squared centered L 2 -discrepancy value of the Triple design and the wordlength pattern of the original design, which provides a theoretical basis for selecting a uniform design from an original design with minimum aberration by the level permutations. Moreover, the projection uniformity of the Triple design and its original design is considered, and the relationship of the uniformity pattern between the Triple design and its original design is built. Finally, some numerical results are used to support our theoretical results.
신철민,Hongyi Qin,Seokjun Hong,Sanghyuk Jeon,Atul Kulkarni,Taesung Kim 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12
During the Chemical mechanical planarization (CMP), the pad conditioning process can affect the pad surface characteristics. Among many CMP process parameters, the improper applied load on the conditioner arm may have adverse effects on the polyurethane pad. In this work, we evaluated the pad surface properties under the various conditioner arm applied during pad conditioning process. The conditioning pads were evaluated for surface topography, surface roughness parameters such as Rt and Rvk and Material removal rate (MRR) and within-wafer non-uniformity after wafer polishing. We observed that, the pad asperities were collapsed in the direction of conditioner rotation and blocks the pad pores applied conditioner load. The Rvk value and MRR were founded to be in relation with 4 > 1 > 7 kgF conditioner load. Hence, this study shows that, 4 kgF applied load by conditioner is most suitable for the pad conditioning during CMP.
High-Purity Amino-Functionalized Graphene Quantum Dots Derived from Graphene Hydrogel
Yinhua Jin,Hongyi Qin,김장아,김선영,김형우,임용택,김태성,Atul Kulkarni,김동빈 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.12
The unique properties of graphene quantum dots (GQDs) make them interesting candidate materials for innovative applications. Herein, we report a facile method to synthesize aminofunctionalized graphene quantum dots (AF-GQDs) by a hydrothermal reaction. Graphene oxide (GO) was synthesized by Hummer's method where ultra-small GO sheets were obtained by a prolonged oxidation process followed by sonication using an ultrasonic probe. Subsequently, graphene hydrogel (GH) was also obtained by a hydrothermal synthesis method. Proper care was taken during synthesis to avoid contamination from water soluble impurities, which are present in the precursor, GO solution. Following the treatment of GH in ammonia, ultra-small aminofunctionalized graphene fragments (AF-GQDs) were formed, which detached from the GH to eventually disperse evenly in the water without agglomerating. This modified synthesis process enables the formation of high-purity AF-GQDs (99.14%) while avoiding time-consuming synthesis procedures. Our finding shows that AF-GQDs with sizes less than 5 nm were well dispersed. A strong photoluminescence (PL) emission at ~410 nm with 10% PL quantum yield was also observed. These AF-GQDs can be used in many bio applications in view of their low cytotoxicity and strong fluorescence that can be applied to cell imaging.