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Yifu Zhang,Chongxue Chen,Juecheng Zhang,Ling Hu,Weibing Wu,Yalan Zhong,Yuliang Cao,Xinghai Liu,Chi Huang 한국물리학회 2013 Current Applied Physics Vol.13 No.1
VO2(M) nanobelts encapsulated into carbon coreeshell structured composite (VO2(M)@C) was successfully synthesized by the thermal treatment with the precursor V3O7$H2O@C composite under the inert atmosphere. The as-obtained sample was characterized by XRD, EDS, EA, FT-IR, Raman, SEM and TEM measurements. The core exhibited monoclinic phase VO2(M) and the carbon coated on the surface of VO2(M) was amorphous. The average thickness of carbon was about 18.5 nm. The possible formation mechanism of VO2(M)@C was proposed as that the reaction underwent the solid state reaction by the interface reaction between V3O7 core and carbon shell. Furthermore, VO2(M) and VO2(M)@C composite were explored as the cathode materials to apply in lithium-ion batteries, indicating that the VO2(M)@C composite electrode exhibited the better electrochemical properties than that of pure VO2(M), achieving the aim of improving the electrochemical properties of VO2(M).
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Yalan Chen,Jingtong Zhang,Haijun Liu,Zhaojie Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.12
Sodium ion batteries based on the more sodium source reserve than that of lithium have been designed as promising alternatives to lithium ion batteries. However, several problems including unsatisfied specific capacity and serious cyclic stability must be solved before the reality. One of the effective approaches to solve the abovementioned problems is to search for suitable anode materials. In this work, we designed and prepared FeSe2 nanoflakes via a simple hydrothermal method which can be adjusted in composition by Fe precursor. As a potential anode for sodium storage, the optimized FeSe2 electrode was further evaluated in different electrolytes of NaClO4 in propylene carbonate/fluoroethylene carbonate and NaCF3SO3 in diethylene glycol dimethyl ether. The capacity was about 470 mA h g-1 and 535 mA h g -1 at 0.5 Ag-1, respectively, in the voltage between 0.5V and 2.9V in the cycle of stabilization phase. Superior performance both in capacity and in stability was obtained in ether-based electrolyte, which affords the property without plugging the intermediates of transition metal dichalcogenides during charge/discharge processes.
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의인화된 브랜드 이미지가 모호성, 자아이미지 일치성 및 브랜드 태도에 미치는 영향에 관한 연구
장녕녕(Zhang, Ningning),나아람(Luo, Yalan),전기흥(Jeon, Ki-Heung) 한국상품학회 2021 商品學硏究 Vol.39 No.4
최근 의인화된 커뮤니케이션의 발달로 의인화된 마케팅 전략이 더욱 중요해졌다. 이와 관련하여 본 연구는 의인화된 브랜드 이미지와 모호성, 자아 이미지 일관성, 지각력 및 브랜드 태도에 대한 기존 연구를 검토하고 이를 종합하고 체계화하였다. 분석결과에 의하면 첫째, 의인화된 브랜드 이미지(따뜻함, 친밀성, 능력, 유용성)는 모호성에 부(-)의 영향을 미치는 것으로 확인되어 가설 1은 채택되었다. 둘째, 의인화된 브랜드의 이미지(따뜻함, 능력, 유용성)는 자아 이미지 일치성에 정(+)의 영향을 미치는 것으로 확인되었으나, 친밀성은 그렇지 않은 것으로 나타나 가설 2는 부분 채택되었다. 셋째, 의인화된 브랜드의 이미지(따뜻함, 친밀성, 능력, 유용성)는 브랜드 태도에 정(+)의 영향을 미치는 것을 밝혀져 가설 3은 채택되었다. 넷째, 모호성은 자아 이미지 일치성에 부(-)의 영향을 미치는 것으로 나타났다. 이는 의인화된 브랜드에 대한 정보가 부족하거나 명확하지 않을 경우에는 자아이미지와의 일치성을 낮게 인식한다는 것을 의미하는 것으로 가설 4는 채택되었다. 다섯째, 모호성은 부정적인 브랜드 태도 형성에 유의미한 영향이 확인되지 않아 가설 5는 기각되었다. 여섯째, 자아 이미지 일치성은 브랜드 태도에 정(+)에 영향 미치는 것으로 나타나 가설 6은 채택되었다. 일곱째, 모호성은 의인화된 브랜드 이미지가 자아 이미지 일치성에, 그리고 자아이미지 일치성은 의인화된 브랜드 이미지와 브랜드 태도에 미치는 영향을 매개한 것으로 나타나 가설 8과 가설 9는 지지되었다. 하지만 모호성은 의인화된 브랜드 이미지가 브랜드 태도에 미치는 영향을 매개하지 않는 것으로 나타나 가설 7은 기각되었다. With the recent development of anthropomorphic communication, anthropomorphic marketing strategies become more important. In this regard, this study examines existing research on anthropomorphic brand image and ambiguity, self-image consistency, Perceptual, and brand attitude, and synthesizes and systematizes them. First, it was confirmed that anthropomorphic brand images (warmth, intimacy, competence, and usefulness) have a negative (-) effect on ambiguity. H 1 was significant. Second, the anthropomorphic brand image (warmth, intimacy, competence, and utility) confirms the impact of self-image consistency on affect (+). But intimacy among the image characteristics of anthropomorphic brands did not have an effect on self-image. Anthropomorphic brand images have a positive (+) effect on self-image congruence. H 2 was partially adopted. Third, anthropomorphic brand images (warmth, intimacy, competence, and utility) confirm a positive (+) effect on brand attitudes. H 3 was significant. Fourth, a negative (-) effect of ambiguity on self-image congruence was identified. H 4 was significant. However, ambiguity did not have a negative effect on brand attitudes. H 5 was rejected. Fifth, self-image consistency has an impact on brand attitude. Sixth, although fuzziness has no media effect between anthropomorphic brand image and brand attitude, it has no media effect between anthropomorphic brand image and self-image consistency. In addition, the consistency of self-image is the influence of anthropomorphic brand image and brand attitude.
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Positively Charged and pH-sensitive Carbon Dots for Fluorescence Detection of Copper Ion
Feng Feng,Chenfang Miao,Yalan Zhang,Zhengjun Huang,Shaohuang Weng 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.2
As an essential trace element in the human body, copper ion (Cu2+) performs an important role in many fundamental physiological processes that need a facile and effective method for the monitoring of Cu2+ in organisms. Herein, a turn-off, facile fluorescent strategy for sensing Cu2+ was proposed using positively charged carbon dots (P-CDs) as probe. The P-CDs prepared from melting strategy exhibited stable, biocompatible, and pH-sensitive luminescent properties. P-CDs can be selectively quenched by Cu2+ for the direct detection of Cu2+. The reaction mechanism between Cu2+ and P-CDs was systematically investigated, illustrating that Cu2+ coordinated with the surface functional groups in P-CDs. The binding effect of Cu2+ and P-CDs caused the constant morphology and static quenching behavior of P-CDs. The promising accuracy of the testing results of the addition of Cu2+ in diluted serum using P-CDs implied their extended application in the biological field.
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Highly Efficient Photocatalysts Based on Lamellar-Shaped Bi2S3 Grown on TiO2 Monolith
Kaidi Li,Fangfang Zhang,Huiming Wang,Yalan Zhou,Lixin Zhao,Jimin Du,Yating Gao,Weimin Wang,강대준 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.09
Here, the lamellar-shaped Bi2S3 grown on a porous TiO2 monolith was obtained by a two-step method including a sol–gel route and hydrothermal treatment. The photocatalytic activity of the as-synthesized Bi2S3/TiO2 composites was evaluated for photodegradation of methylene blue (MB) dye in aqueous solution under the visible-light irradiation. Based on our experimental results, 5% (molar ratio of Bi2S3 to TiO2) Bi2S3/TiO2 photocatalysts exhibited a maximum photodegradation rate of MB up to 96.9% under visible-light irradiation for 120 min. Our findings indicated that the lamellar-shaped Bi2S3 can extend the light absorption up to visible areas, and porous TiO2 can provide enhanced specific surface area and more mass transfer pathway to enhance the photodegradation efficiency. Furthermore, porous TiO2 can accept the electrons from the Bi2S3 conduction band due to the relatively positive electrode potential to impede the photoproduced electron and hole combination to result in advanced photocatalytic performance.
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