Continuous supercritical hydrothermal synthesis of dispersible zero-valent copper nanoparticles for ink applications in printed electronics |
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| Affiliation: | 1. Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan;2. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan;3. Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology, 4-2-1, Nigatake, Miyagino-ku, Sendai 983-8551, Japan;1. Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;2. School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;1. Department of Physics, Sri Venkateswara University, Tirupati 517502, India;2. Department of Nano-Structured Materials Research, National NanoFab Center at KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea;3. Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea;4. Department of Zoology, Sri Venkateswara University, Tirupati 517502, India;1. Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt;2. Military Technical Research Center, Cairo, Egypt;3. Chemistry Department, Faculty of Science, Benha University, Benha, 13518, Egypt;1. Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory, Homi Bhabha Road, Pashan, Pune 411008, India;2. Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Homi Bhabha Road, Pashan, Pune 411008, India |
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| Abstract: | Surface-modified zero-valent copper nanoparticles (CuNPs) are of interest as conductive inks for applications in printed electronics. In this work, we report on the synthesis, stability and characterization of CuNPs formed with a continuous supercritical hydrothermal synthesis method. The precursor, copper formate, was fed as an aqueous solution with polyvinylpyrrolidone (PVP) surface modifier and mixed with an aqueous water and formic acid stream to have reaction conditions of 400 °C, 30 MPa and 1.1 s mean residence time. The reaction pathway seemed to proceed step-wise as the hydrolysis of copper formate, followed by dehydration to oxide products and subsequent reduction by hydrogen derived from precursor and formic acid decomposition. The formed surface-modified zero-valent CuNPs had particle sizes of ca. 18 nm, were spherical in shape and contained no oxide contaminants. The formed CuNPs were found to exhibit long-term (>1 year) stability in ethanol as evaluated by shifts in the surface plasmon resonance band of product solutions. Conductive films (0.33 μm thickness) prepared with the CuNPs had a resistivity of 16 μΩ cm. The methods reported in this work show promise for producing conductive inks for use in practical printed electronics. |
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| Keywords: | Nanoparticles Supercritical water Surface modification Polyvinylpyrrolidone Formic acid |
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