Sintesis Nanopartikel Cobalt Ferrite (CoFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya
| Main Authors: | Arief Setiadi, Eko, Shabrina, Nanda, Retno Budi Utami, Hesti, Fadhilah Fahmi, Nur, Kato, Takeshi, Iwata, Satoshi, Suharyadi, Edi |
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| Format: | Article PeerReviewed application/pdf |
| Terbitan: |
, 2013
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| Subjects: | |
| Online Access: |
http://eprints.uns.ac.id/1434/1/10%2DEko%2DArief%2DSetiadi%2Dhal%2D55.pdf http://eprints.uns.ac.id/1434/ |
Daftar Isi:
- Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperature and concentration of NaOH. The structural characteristics and particle size of CoFe2O4 were determined by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), its showed that nanoparticles well crystallized with various grain size which depend on synthesis parameters. The grain sizes estimated using the Scherrer formula were found that the grain size increased with increasing temperature synthesis and decreasing concentration of NaOH. Magnetic characterization of CoFe2O4 nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample with various concentration of NaOH showed that coercivity was decrease with the decrease of particle size. In other hand, samples with various synthesis temperature found that sample with smallest grain size have high coersivity. The saturation magnetization increase when crystallinity increase. Based on the results, it can be concluded that magnetic characterization of CoFe2O4 was influenced by grain size and crystallinity. Keywords: nanoparticles, CoFe2O4, co-presipitation Nanopartikel magnetik Cobalt Ferrite (CoFe2O4) telah berhasil disintesis dengan metode ko- presipitasi dengan memvariasi parameter suhu dan konsentrasi NaOH. Struktur dan ukuran par- tikel hasil analisa X-Ray Diffraction (XRD) dan Transmission Electron Microscopy (TEM) menunjukkan bahwa nanopartikel mengkristal dengan baik dan ada ketergantungan ukuran bu- tir nanopartikel terhadap dua variasi parameter sintesis tersebut. Ukuran butir yang dihitung menggunakan persamaan Scherrer menunjukkan bahwa ukuran butir meningkat seiring pen- inggkatan suhu dan berkurangnya konsentrasi NaOH. Sifat kemagnetan CoFe2O4 hasil analisa Vibrating Sample Magnetometer (VSM). Sampel dengan variasi konsentrasi NaOH, semakin kecil ukuran butir nanopartikel, medan koersivitasnya semakin rendah. Sementara untuk sam- pel dengan variasi suhu, semakin kecil ukuran butir, medan koersivitasnya semakin tinggi. Ha- sil VSM juga menunjukkan bahwa semakin tinggi kristalinitas sampel, nilai magnetisasi satu- rasinya semakin tinggi. Dengan demikian dapat disimpulkan bahwa ukuran butir dan kristalini- tas mempengaruhi sifat kemagnetan nanopartikel CoFe2O4. Kata kunci: nanopartikel, CoFe2O4, kopresipitasi