Department of Chemical Engineering

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Author: search.filters.author.Etika, Krishna ChitanyaSubject: search.filters.subject.Chemical engineering

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    Hydrothermal synthesis of conductive copper nanowires: effect of oleylamine and dextrose concentrations
    (RSC, 2025-11) Etika, Krishna Chitanya
    One-dimensional (1-D) metallic nanoparticles (i.e., nanowires, nanorods) exhibit unique properties and are useful in a variety of applications. 1-D copper nanowires (CuNWs) exhibit excellent electrical conductivity making them an economical alternative in applications that typically employ silver or gold nanowires. In this study, CuNWs were synthesized via an environmentally benign and scalable hydrothermal synthesis method using CuCl2 (CuP) as a copper precursor. Oleylamine (OAm) and dextrose (D) were employed as capping and reducing agents, respectively. The focus of this work was to investigate the influence of varying CuP[thin space (1/6-em)]:[thin space (1/6-em)]OAm and CuP[thin space (1/6-em)]:[thin space (1/6-em)]D molar ratios during synthesis on the nanowire growth, morphology, and electrical conductivity. A series of synthesis trials were conducted by only varying CuP[thin space (1/6-em)]:[thin space (1/6-em)]OAm or CuP[thin space (1/6-em)]:[thin space (1/6-em)]D molar ratios, while keeping all other reaction conditions constant. Morphological analysis of the synthesized products suggests that both OAm and D are essential for the formation of CuNWs. A synthesis conducted at a 1[thin space (1/6-em)]:[thin space (1/6-em)]3.75[thin space (1/6-em)]:[thin space (1/6-em)]1.1 CuP[thin space (1/6-em)]:[thin space (1/6-em)]OAm[thin space (1/6-em)]:[thin space (1/6-em)]D molar ratio produced nanowires with average diameter of 96 nm, while higher OAm concentration resulted in CuNWs with larger diameters. X-ray diffraction analysis confirmed the crystalline nature of the synthesized CuNWs, with diffraction peaks corresponding well to those of FCC copper. The capping of CuNWs with OAm was confirmed through FTIR spectroscopy. Thermogravimetric (TGA) studies on CuNWs show that OAm content in CuNWs increases with increasing CuP[thin space (1/6-em)]:[thin space (1/6-em)]OAm molar ratio during synthesis. The electrical conductivity of CuNW pellets was found to decrease with increasing CuP[thin space (1/6-em)]:[thin space (1/6-em)]OAM molar ratio during synthesis. The highest conductivity of 1.38 × 105 S cm−1 was exhibited in the sample made using 1[thin space (1/6-em)]:[thin space (1/6-em)]3.75[thin space (1/6-em)]:[thin space (1/6-em)]1.1 CuP[thin space (1/6-em)]:[thin space (1/6-em)]OAm[thin space (1/6-em)]:[thin space (1/6-em)]D molar ratio. Furthermore, holding CuNWs pellets under ambient conditions for 60 days did not affect their electrical conductivity.
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    Recent trends in nanotechnology for sustainable living and environment:
    (Springer, 2023) Roy, Banasri; Ghosh, Sarbani; Etika, Krishna Chitanya
    This book presents the select proceedings of International Conference on Nanotechnology for Sustainable Living and Environment (ICON-NSLE 2022). It covers the latest trends in nanotechnology and its applications in various sectors such as energy, environment, food technology, and biomedicine. Various topics covered in this book are nanomaterial preparation and characterization, nanobiotechnology, nanodevices, waste to wealth, pollution abatement, renewable energy, advanced materials, sensors and portable electronics, biomedical applications, food preservation, etc. This book is useful for researchers and professionals working in the area of nanotechnology and environment sustainability.