We have prepared stable ultrafine narrow dispersed copper nanoparticles (Cu-NPs) using a facile chemical reduction technique below room temperature (300 K), without any template. X-ray diffraction and high-resolution transmission electron microscopy studies reveal the growth of highly crystalline Cu-NPs with an average diameter of 2.2 nm. Interestingly, these Cu-NPs demonstrate both interband electronic transitions along with usual surface plasmon resonance, a unique phenomenon previously unobserved in any noble metal nanoparticles. These Cu-NPs do not get oxidized easily and could be suitable candidates for different optical devices, heat transfer liquids, and biological applications.
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M. Pal thanks the Council for Scientificand Industrial Research (CSIR) Govt. of India for the rnfrastructural support. O. Mondal acknowledges University Grants Commission for her fellowship. D.C. thanks Indian National Science Academy, New Delhi, India for an Honorary Scientist’s position.
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Materials, characterization technique, TEM image of S1 (Fig. S1), FTIR spectrum (Fig. S2), and TGA curve (Fig. S3) of sample S3 for chemical analysis of surface, reaction mechanism, Table S1 (Comparison of particle size as calculated from XRD, TEM and Optical study).
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Mondal, O., Datta, A., Chakravorty, D. et al. Ultrafine narrow dispersed copper nanoparticles synthesized by a facile chemical reduction method. MRS Communications 3, 91–95 (2013). https://doi.org/10.1557/mrc.2013.13