Sains Malaysiana 40(9)(2011): 1019–1022

Kesan Kepekatan Glukopon 215 Csup Terhadap Saiz dan Sifat Magnet Nanozarah Co-Ni-Cu yang Disediakan dengan Kaedah Elektropengendapan

(Effects of Glucopone 215 Csup Concentration on Size and Magnetic Property of Co-Ni-Cu

Nanoparticles Prepared by Electrodeposition Method)

Abdul Razak Daud*, Setia Budi & Shahidan Radiman

Pusat Pengajian Fizik Gunaan, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor, Malaysia

Received: 16 June 2010 / Accepted: 7 January 2011

ABSTRAK

Nanozarah Co-Ni-Cu telah disediakan dengan kaedah elektropengendapan pada keupayaan pengendapan -925 mV (SCE) menggunakan larutan sulfat (0.018M Co2++ 0.180M Ni2+ + 0.002M Cu2+) yang mengandungi surfaktan Glukopon 215 CSUP dan juga tanpa surfaktan. Kesan kepekatan surfaktan terhadap saiz dan sifat magnet nanozarah Co-Ni-Cu yang terhasil telah dikaji. Analisis morfologi permukaan endapan yang diperoleh dilakukan dengan menggunakan mikroskop elektron imbasan pancaran medan (FESEM) manakala sifat magnetnya diselidiki dengan menggunakan magnetometer getaran sampel (VSM). Nanozarah Co-Ni-Cu yang disediakan daripada larutan yang mengandungi Glukopon 215 CSUP didapati berbentuk sfera dengan saiz berskala nanometer. Saiz zarah paling kecil ialah lebih kurang 50 nm, diperoleh pada kepekatan surfaktan 5 %v, iaitu kepekatan paling tinggi yang dikaji dalam kajian ini. Kepaksaan (Hc) didapati lebih tinggi pada sampel yang disediakan daripada elektrolit yang mengandungi surfaktan berbanding tanpa surfaktan.

Kata kunci: Elektropengendapan; nanozarah Co-Ni-Cu; sifat magnet; surfaktan

ABSTRACT

Co-Ni-Cu nanoparticles were prepared by electrodeposition method at co-deposition potential of -925 mV (SCE) from sulphate solution (0.018M Co2++ 0.180M Ni2+ + 0.002M Cu2+), both in the presence and in the absence of surfactant, Glucopone 215 CSUP. The effect of surfactant concentration on size and magnetic properties of Co-Ni-Cu nanoparticles produced was investigated. Surface morphology was analyzed using a field emission scanning electron microscope (FESEM) while its magnetic properties were investigated by a vibrating sampel magnetometer (VSM). Co-Ni-Cu nanoparticles prepared from the Glucopone 215 CSUP- containing solution were spherical with nanometer size. The finest particles were about 50 nm obtanied when 5 v% of surfactant was used which was the highest surfactant concentration studied in this work. Coercivity (Hc) of the samples prepared from electrolytes containing surfactant was higher than those of prepared without surfactant.

Keywords: Co-Ni-Cu nanoparticles; electrodeposition; magnetic properties; surfactant

REFERENCES

Chipara, M., Skomski, R. & Sellmyer, D.J. 2007. Electrodeposition and magnetic properties of polypyrrole-Fe nanocomposites. Materials Letters 61: 2412-2445.

Gomez, A. & da Silva Pereira, M.I. 2006. Pulsed electrodeposition of Zn in the presence of surfactants. Electrochimica Acta. 51: 1342-1350.

Gopalan, R., Hono, K., Yan, A. & Gutfleisch, O. 2006. Direct evidence for Cu concentration variation and its correlation to coercivity in Sm(Co0.74Fe0.1Cu0.12Zr.04)7.4 ribbons. Scripta Materilia 60: 764-767.

Inamdar, A.I., Mujawar, S.H., Ganesan, V. & Patil, P.S. 2008. Surfactant-mediated growth of nanostructured zinc oxide thin films via electrodeposition and their photoelectrochemical performance. Nanotechnology 19: 1-7.

Jiles, D.C. 2003. Recent advances and future directions in magnetic materials. Acta Materialia 51: 5907-5939.

Kaewrawang, A., Ghasemi, A., Liu, X. & Morisako, A. 2009. Crystallographic and magnetic properties of SrM thin films on Pt underlayer prepared at various substrate temperatures. Journal Magnetism and Magnetic Materials 321: 1939-1942.

Mondal, B.N., Basumallick, A. & Chattopadhyay, P.P. 2008. Magnetic behavior of nanocrystalline Cu-Ni-Co alloys prepared by mechanical alloying and isothermal annealing. Journal of Alloys and Compounds 457: 10-14.

Rusling, J.F. 1997. Molecular aspects of electron transfer at electrodes in micellar solutions. Colloids Surfaces A 123-124: 81-88.

Sasikala, G., Dhanasekaran, R. & Subramanian, C. 1997. Electrodeposition and optical characterisation of CdS thin films on ITO-coated glass. Thin solid films 302: 71-76.

Siddig, M.A., Radiman, S., Jan, L.S. & Muniandy, S.V. 2006. Rheological behaviours of the hexagonal and lamellar phases of glucopone (APG) surfactant. Colloids surface A 276: 15-21.

Zhang, Y., Gabay, A., Wang, Y. & Hadjipanayis, G.C. 2004. Microstructure, microchemistry, and coercivity in Sm-Co-Cu and Pr-Co-Cu 1:5 Alloys. Journal of Magnetism and Magnetic Materials 272-276: E1899-E1900.

*Corresponding author; email: ard@ukm.my