SINTESIS NANOPARTIKEL MAGNETIK CORE/SHELL Fe/ OKSIDA Fe DENGAN METODE REDUKSI KIMIA
DOI:
https://doi.org/10.17146/jsmi.2012.13.3.4669Keywords:
Nanopartikel Magnetik, Struktur Core-Shell, Fe/oksida Fe, Fasa, Sifat Magnetik, Magnetic Nanoparticles, Core-Shell Structure, Fe/Fe Oxide, Phase, Magnetic PropertiesAbstract
SINTESIS NANOPARTIKEL MAGNETIK CORE/SHELL Fe/Oksida Fe DENGAN METODE REDUKSI KIMIA. Makalah ini menyajikan proses sintesis nanopartikel magnetik dengan struktur core/shell, dimana bagian core (inti) berupa fasa Fe dan bagian shell (kulit) berupa fasa oksida Fe yang diharapkan menghasilkan nanopartikel dengan nilai magnetisasi tinggi. Proses sintesis dilakukan dengan proses reduksi FeCl3 oleh NaBH4 untuk membentuk bagian core yang diikuti dengan pembentukan fasa oksida besi dengan pereaksi Trimethylamine N-oxide (TMNO). Morfologi, komposisi fasa dan sifat magnetik struktur core/shell yang terbentuk dioptimalisasi dengan memvariasikan perbandingan komposisi FeCl3 dan NaBH4 pada rentang nilai perbandingan mol 1 hingga 3. Pengamatan morfologi menunjukkan telah terbentuknya struktur core/shell yang cukup sempurna dengan ukuran core maksimal < 40 nm dan shell ~5 nm terutama untuk komposisi 1 : 2. Namun hasil analisis fasa menunjukkan, selain fasa Fe dan oksida Fe, juga hadir fasa pengotor paduan Fe-B dan fasa turunan dari reduktor NaBH4. Kondisi ini mempengaruhi pembentukan sifat magnetik sehingga nilai maksimum mencapai 72 emu/gram untuk komposisi 1: 2.
ABSTRACT
SYNTHESIS OF MAGNETIC NANOPARTICLE OF CORE-SHELL Fe/Fe OXIDE USING CHEMICAL REDUCTION METHOD. This paper describes the synthesis of magnetic nanoparticles having core-shell structure in which Fe phase as a core were surrounded by Fe oxide phase as a shell. This structure is expected to give a magnetic nanoparticle having high magnetization value. Fe/Fe oxide core/shell nanoparticles were synthesis through reduction process of FeCl3 by NaBH4 reductor to produce zero valent Fe followed by surface modification using TMNO reactant to form Fe oxide phase layer around Fe. Morphology, phase composition and magnetic properties were optimized by varying mole ratio of FeCl3
and NaBH4 between 1and 3. TEM observation showed the formation of core/shell structure with core sizes < 40 nm and shell ~ 5 nm especially for 1 : 2 compositions. However, phase analysis result showed, besides the Fe and Fe oxides phase, impurities phase of the Fe-B alloy and NaBH4 derivative phase are also present. This condition affects the magnetic properties formation and result in magnetization maximum value of only 72 emu/gram for the 1 : 2 composition.
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