NDLI: Fabrication of Cu nanoparticles by high-intensity femtosecond laser irradiation of solution

Content Provider	IEEE Xplore Digital Library
Author	Nakamura, T. Herbani, Y. Sato, S.
Copyright Year	2011
Description	Author affiliation: Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan (Nakamura, T.; Herbani, Y.; Sato, S.)
Abstract	We have recently demonstrated a method for the preparation of gold [1], platinum [2], and gold-silver alloy nanoparticles [3] by high intensity laser irradiation of metallic salts solution. The formation of metal nanoparticles in the absence of any reducing agent can be attributed to the active species generated by high-intensity laser irradiation of water molecules (i.e., H2O → $ℯ^{−},$ $H^{⋅},$ $OH^{⋅},$ etc.). Solvated electrons $(ℯ^{−})$ and hydrogen radicals $(H^{⋅})$ are known to act as strong reducing agents in the solution. Accordingly, metal ions in the solution are readily reduced to rezo-valent metal. This technique enables us to produce metal nanoparticles with a narrow size distribution as well as small particle size down to single nanometer and is applicable to a large number of metal solutions. However, for a copper solution, $Cu^{2+}$ ion has an absorption peak around 800 nm, which corresponds to the wavelength of a Ti:sapphire laser beam. Therefore, photo-induced reduction can hardly occur at the focal point because the laser beam is absorbed by the solution and then the laser intensity is attenuated before reaching the focal point. When ammonia is added to a solution of $Cu^{2+}$ ion, complex tetraammine copper (II) is formed and the absorption peak of Cu ion moves to 600 nm. (e.g., CuSO4 + 4NH3 → $[Cu(NH]^{2+}$ + $SO^{2−}).$ In this study, we fabricate Cu nanoparticles by high-intensity laser irradiation using tetraammine copper (II) ions as precursors. Complex ion solution was prepared by dissolving the copper (II) sulfate pentahydrate (CuSO4·5H2O) in 1.0 wt% NH3 solution with the concentration of 0.05 wt%. 2-propanol ((CH3)2CHOH) was added to the solution as a scavenger of hydroxyl radical $(OH^{.})$ to promote the reduction process. A quartz glass cuvette was filled with the solution of 3 ml. Femtosecond laser beam (wavelength: 800 nm; pulse energy: 5 mJ; pulse width: 100 fs; repetition rate: 100 Hz) was tightly focused in the solution by an aspheric lens (focal length: 8 mm; numerical aperture: 0.5). The laser intensity was estimated to be $2.1×10^{14}$ $W/cm^{2}.$ The irradiation time was 1 hour in the experiment.
Starting Page	1
Ending Page	1
File Size	246360
Page Count	1
File Format	PDF
ISBN	9781457705335
e-ISBN	9781457705328
DOI	10.1109/CLEOE.2011.5943342
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-22
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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