• Title/Summary/Keyword: Copper nanoparticles

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Cytotoxicity of Copper Nanoparticles in Cultured Human Bronchial Epithelial Cells (BEAS-2B) (구리로 만든 나노입자의 기관지상피세포에 미치는 독성)

  • Park Eun-Jung;Park Kwangsik
    • Toxicological Research
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    • v.21 no.4
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    • pp.303-307
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    • 2005
  • Nanomaterials, which ranges in size from 1 to 100 nm, have been used to create uqnique devices at the nanoscale level possessing novel physical and chemical functional properties. However, the toxicities of nanomaterials have not been fully tested and the risk of nanomaterials is emerging issues in these days. In this study, the cytotoxicity of copper nanoparticles was tested in cultured human bronchial epithelial cells. As a results, copper nanoparticles showed cytotoxicity similar with cupric ion and the apoptotic mechanisms of DNA fragmentation and caspase-3 activation were involved. Induction of heme oxygenase-1 and thioredoxin reductase by copper nanoparticles indicated that cytotoxicity of copper nanoparticles is likely to be mediated through oxidative stress.

Synthesis of Copper Nanoparticles by a Chemical Reduction Method (화학적 환원법에 의한 구리 나노분말 합성)

  • Choi, Min Woo;Bae, Min Hwan;Ahn, Jung-Ho
    • Journal of Powder Materials
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    • v.23 no.3
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    • pp.228-234
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    • 2016
  • Copper nanoparticles attract much attention as substitutes of noble metals such as silver and can help reduce the manufacturing cost of electronic products due to their lower cost and good conductivity. In the present work, the chemical reduction is examined to optimize the synthesis of nano-sized copper particles from copper sulfate. Sodium borohydride and ascorbic acid are used as reducing and antioxidant agents, respectively. Polyethylene glycol (PEG) is used as a size-control and capping agent. An appropriate dose of PEG inhibits the abnormal growth of copper nanoparticles, maintaining chemical stability. The addition of ascorbic acid prevents the oxidation of nanoparticles during synthesis and storage. Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) are used to investigate the size of the synthesized nanoparticles and the coordination between copper nanoparticles and PEG. For chemical reduction, copper nanoparticles less than 100 nm in size without oxidized layers are successfully obtained by the present method.

Preparation of Copper Nanoparticles and Catalytic Properties for the Reduction of Aromatic Nitro Compounds

  • Duan, Zhongyu;Ma, Guoli;Zhang, Wenjun
    • Bulletin of the Korean Chemical Society
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    • v.33 no.12
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    • pp.4003-4006
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    • 2012
  • A novel copper nanoparticles were synthesized from cupric sulfate using hydrazine as reducing reagents. A series of aromatic nitro compounds were reacted with sodium borohydride in the presence of the copper nanoparticles catalysts to afford the aromatic amino compounds in high yields. Additionally, the catalysts system can be recycled and maintain a high catalytic effect in the reduction of aromatic nitro compounds.

Study of Thermal Behaviors on sub-50 nm Copper Nanoparticles by Selective Laser Sintering Process for Flexible Applications (선택적 레이저 공정을 이용한 구리 나노 입자의 소결 특징 분석 및 플렉서블 전자 소자 제작 기술 개발에 관한 연구)

  • Gwon, Jin-Hyeong;Jo, Hyeon-Min;Lee, Ha-Beom;Eom, Hyeon-Jin;Go, Seung-Hwan
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2016.11a
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    • pp.134-134
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    • 2016
  • The effect of different thermal treatments on the sub-50 nm copper nanoparticles is examined in the aspects of chemical, electrical and surface morphology. The copper nanoparticles are chemically synthesized and fabricated for paste-type solution. Simple bar coating method is practiced as a deposition process to form copper thin film on a typical slide glass. Deposited copper thin films are annealed by two different routes: general tube furnace with 99.99 % Ar atmosphere and selective laser sintering process. The thermal behavior of the different thermal-treated copper thin films is compared by SEM, XRD, FT-IR and XPS analysis. In this study, the laser sintering process ensures low annealing temperature, fast working speed and ambient-accessible route. Moreover, the laser-sintered copper thin film shows good electrical property and enhanced chemical stability than conventional thermal annealing process. Consequently, the proposed laser sintering process can be compatible with plastic substrate for flexible applications.

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Antimicrobial Evaluation and Characterization of Copper Nanoparticles Synthesized by the Simple Chemical Method

  • Wazir, Arshad Hussain;Khan, Qudratullah;Ahmad, Nisar;Ullah, Faizan;Quereshi, Imdadullah;Ali, Hazrat
    • Korean Journal of Materials Research
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    • v.32 no.2
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    • pp.80-84
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    • 2022
  • Copper nanoparticles (CuNPs) are considered of great importance due to their high catalytic and antimicrobial activities. This study focuses on the preparation and characterization of CuNPs, and on their antibacterial/antifungal activities. A copper salt (copper sulfate pentahydrate) as precursor, starch as stabilizing agent, and ascorbic acid as reducing agent were used to fabricate CuNPs. The resulting product was characterized via different techniques such as X-ray diffractrometry (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and Scanning electron microscopy (SEM) to confirm its characteristic properties. Employing the Scherrer formula, the mean crystallite sizes of copper (Cu) and cuprous oxide (Cu2O) nanocrystals were found to be 29.21 and 25.33 nm, respectively, as measured from the main X-ray diffraction peaks. The functional groups present in the resulting CuNPs were confirmed by FTIR. In addition, the engineered CuNPs showed antibacterial and antifungal activity against tested pathogenic bacterial and fungal strains.

Evolutional Transformations of Copper Nanoparticles to Copper Oxide Nanowires

  • Gang, Min-Gyu;Yun, Ho-Gyu;Kim, Yeong-Seok
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2011.10a
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    • pp.18.2-18.2
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    • 2011
  • We study and analyze here a novel and simple approach to produce copper oxide nanowires in a methanol as an alternative to chemical synthesis routs and VLS-growth method. First, copper oxide nanowires are grown from copper nanoparticles in methanol at $60^{\circ}C$. Nanoparticles are synthesized via inert gas condensation, one of the dry processes. Synthesized nanowires were confirmed via XRD, FESEM and TEM. As a result, all particles have grown to Cu2O nanowires (20~30 nm in diameter, 5~10 um in length; aspect ratio >160~500). Next, these synthesized oxide nanowires are reduced copper nanowires in the furnace under hydrogen flow at $200{\sim}450^{\circ}C$. The evolution of oxide nanowires and their transformation to copper nanowires is studied as a function of time.

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Interconnecting Nanomaterials for Flexible Substrate and Direct Writing Process

  • Jwa, Yong-Ho
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2012.05a
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    • pp.58.1-58.1
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    • 2012
  • Direct write technologies provide flexible and economic means to manufacture low-cost large-area electronics. In this regard inkjet printing has frequently been used for the fabrication of electronic devices. Full advantage of this method, which is capable of reliable direct patterning with line and space dimensions in the 10 to 100 um regime, is only made with all-solution based processing. Among these printable electronic materials, silver and copper nanoparticles have been used as interconnecting materials. Specially, solutions of organic-encapsulated silver and copper nanoparticles may be printed and subsequently annealed to form low-resistance conductor patterns. In this talk, we describe novel processes for forming silver nanoplates and copper ion complex which have unique properties, and discuss the optimization of the printing/annealing processes to demonstrate plastic-compatible low-resistance conductors. By optimizing both the interconnecting materials and the surface treatments of substrate, it is possible to produce particles that anneal at low-temperatures (< $200^{\circ}C$) to form continuous films having low resistivity and appropriate work function for formation of rectifying contacts.

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Trends on Synthesis of Cu Nanoparticles by a Wet Reduction Method (습식 환원법에 의한 Cu 나노입자의 합성 동향)

  • Shin, Yong Moo;Chee, Sang-Soo;Lee, Jong-Hyun
    • Journal of the Microelectronics and Packaging Society
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    • v.20 no.3
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    • pp.11-18
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    • 2013
  • Interest in copper nanoparticles has increased as an alternative for substituting silver nanoparticles because of its lower cost and less electromigration effect than silver. In this paper, the recent research trends and main results in wet-chemical synthesis of sub-100 nm Cu nanoparticles were summarized. The characteristics of synthesis were discussed with a classification such as modified polyol synthesis, modified hydrothermal synthesis, solvothermal synthesis, and the others, focussing on effects of capping agents, reductants, and pH. Information on the oxidation of synthesized copper nanoparticles were additionally commented.

Synthesis and Characterization of Water Soluble Fluorescent Copper Nanoparticles

  • Yu, Ji Soo;Kim, Sung Hun;Man, Minh Tan;Lee, Hong Seok
    • Applied Science and Convergence Technology
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    • v.27 no.4
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    • pp.75-77
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    • 2018
  • The electrostatic interaction between emerging quantum-confined nanostructures with plasmonic structures is crucial for future biological applications. Water-soluble green fluorescent copper nanoparticles (Cu-NPs) were fabricated. We demonstrate that L-ascorbic acid is considered as a key to precisely control small Cu-NPs and the capability of the surface ligands, while cetyltrimethylammonium bromide is used as a stabilizing agent controls the particle growth, and stabilizes the nanoparticles. Water-soluble green fluorescent Cu-NPs are tunable through modification of the reaction periods.