Sains Malaysiana 43(11)(2014): 1751–1759

Sintesis Nanozarah Kuprum dalam Larutan Kitosan Menggunakan Kaedah Sinaran Gama

(Synthesis of Copper Nanoparticles in Chitosan Aqueous System via Gamma Irradiation)

SHAHRUL IZWAN B. AHMAD¹*, SHAHIDAN B. RADIMAN² & MD. SOOT B. HJ AHMAD²

¹Pusat Asasi Pertahanan, Universiti Pertahanan Nasional Malaysia, Kem Sg. Besi

57000 Kuala Lumpur, Malaysia

²Pusat Pengajian Fizik Gunaan, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

46300 Bangi, Selangor, Malaysia

Received: 17 January 2013/Accepted 11 March 2014

ABSTRAK

Kesan penggunaan kitosan terhadap nanozarah kuprum (Cu) yang disintesis menggunakan sinaran gama sebagai sumber agen penurunan telah dijalankan dalam sistem akues. Dos sinaran terserap yang digunakan adalah 50 kGy manakala penambahan isopropanol adalah penting sebagai penggarut kepada radikal pengoksidaan serta meningkatkan peranan agen penurun yang terhasil daripada proses radiolisis. Analisis serapan optik-UV telah mencirikan sifat optik larutan nanozarah Cu yang disintesis. Ketulenan fasa kristal nanozarah Cu yang terbentuk dalam matrix kitosan telah dibuktikan dengan pembelauan sinar-X (XRD). Berdasarkan imej mikroskop imbasan elektron (TEM), nanozarah Cu yang terhasil adalah berbentuk sfera dengan julat saiz 6-10 nm kecuali nanozarah Cu yang disintesis dalam kepekatan kitosan 0.3% w/v yang menunjukkan taburan bentuk yang tidak sekata. Analisis spektrofotometer transformasi Fourier inframerah (FTIR) yang dijalankan telah mengesahkan kehadiran sebatian kitosan dalam sampel nanozarah Cu dengan kepekatan kitosan 0.1 dan 0.3% w/v. Kajian ini mendapati penggunaan kitosan dapat melindungi nanozarah Cu daripada pengoksidaan oleh persekitaran. Saiz nanozarah juga didapati meningkat seiring dengan peningkatan kepekatan kitosan yang digunakan.

Kata kunci: Kitosan; nanozarah kuprum; sinar gama; sistem akues

ABSTRACT

The effect of chitosan concentration on the copper (Cu) nanoparticles synthesized using gamma irradiation as the source of reducing agent in aqueous system is studied. The total absorbed dose used was 50 kGy while the addition of isopropanol is crucial as scavenger of oxidation radical and to increase the role of reducing agent produced from the radiolysis process. Optical properties of Cu nanoparticles synthesized were characterized using UV-visible spectroscopy. The pure crystal phase of Cu nanoparticles formed in chitosan matrix was proved using X-ray diffractometer (XRD). According to transmission electron microscope (TEM) images, all Cu nanoparticles produced are in spherical shape and their size are in the range of 6-10 nm except that for Cu nanoparticles synthesized in 0.3% w/v chitosan concentration which showed non-uniform shaped distribution. Fourier transform infrared (FTIR) analysis showed the presence of chitosan compound for sample of 0.1 and 0.3% w/v chitosan concentration. This study showed that the use of chitosan can protect Cu nanoparticles from oxidation of the environment. It is also found that, the size of nanoparticles increase based on concentration of chitosan used.

Keywords: Aqueous system; chitosan; copper nanoparticles; gamma irradiation

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*Corresponding author; email: shahrul_izwan85@yahoo.com