Sintesis dan Karakterisasi Microwave Absorbing Material Berbasis Ni-SiO2 dengan Metode Sol-Gel

Siti Wardiyati, Wisnu Ari Adi, Didin Sahidin Winatapura

Abstract


Sintesis dan karakterisasi material Ni-SiO2 telah dilakukan secara sol-gel meggunakan prekursor Tri ethyl orthosilicate (TEOS), asam citrat dan nikel (II) nitrat. Penelitian ini bertujuan untuk mendapatkan bahan microwave absorber magnetik  yang mempunyai fasa tunggal, berukuran nano, bersifat magnetik dan menyerap gelombang elektro magnetik pada kisaran 8 -12 GHz. Untuk mencapai tujuan tersebut dilakukan sintesis  Ni-SiO2 secara sol-gel dengan variasi jumlah  ion Ni dari  0,5 - 1,25 g/25 mL TEOS. Karakterisasi Ni-SiO2 hasil sintesis dilakukan  dengan menggunakan alat X-raydiffraction (XRD) untuk analisis fasa, Fourier Transmission Infra Red (FTIR) untuk mengetahui jenis ikatan yang terjadi,  Vibrating Sample Magnetometer (VSM) untuk mengetahui sifat magnetik bahan yaitu koersivitas dan saturasi magnetik, Transmission Electron Microscope (TEM) untuk mengetahui struktur dan ukuran partikel, dan Vektor Network Analyzer (VNA) untuk mengetahui serapan gelombang suatu bahan. Dari hasil percobaan diperoleh  microwave absorbing material berbasis Ni-SiO2 dengan ukuran partikel < 10 nm, saturasi magnetik 0,0455 emu/g, koersivitas magnetik sebesar  0, 0738T, dan besarnya reflextion loss (RL) – 29,4 dB  pada 10,68 GHz. Nilai  reflextion loss (RL) – 29,4 dB  pada 10,68 GHz ini menunjukkan bahwa microwave absorbing material berbasis  Ni-SiO2 hasil sintesis mempunyai kemapuan menyerap gelombang hingga  97 %  pada frekuensi 10,68 GHz. Hasil tersebut dicapai  pada penambahan ion Ni sebesar 1,0 g/25 mL TEOS.

Keywords


Microwave absorbing materials, SiO2, nickel, sol-gel

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DOI: https://doi.org/10.15294/jf.v8i2.16975

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