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Sains Malaysiana 45(12)(2016): 1787–1794 http://dx.doi.org/10.17576/jsm-2016-4512-02 Pembentukan Cekung Berkualiti Tinggi
Menggunakan Tempoh Penganodan yang Singkat bagi Penghasilan AAO (Formation of High Quality Concave using
Short Anodization Duration for Fabrication of AAO) N.U. SAIDIN1,2,
M.H.H.
JUMALI2*,
K.Y.
KOK1
& I.K. NG1 1Agensi Nuklear
Malaysia, Bangi, 43000 Kajang, Selangor Darul Ehsan, Malaysia 2Pusat Pengajian
Fizik Gunaan, Fakulti Sains dan Teknologi, Universiti Kebangsaan
Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia Diserahkan: 31
Disember 2015/Diterima: 25 Mac 2016 ABSTRAK Kualiti membran AAO
yang disediakan melalui teknik penganodan dua peringkat
adalah sangat dipengaruhi oleh pra-pembentukan cekung yang dihasilkan
semasa penganodan pertama. Kajian ini dijalankan untuk menentukan
tempoh penganodan yang optimum bagi menghasilkan cekung yang berkualiti.
Penganodan dilakukan menggunakan larutan 0.3 M H2C2O4 sebagai
elektrolit dengan beza keupayaan dan suhu masing-masing ditetapkan
pada 40 V dan 18°C. Proses penganodan dilakukan sehingga 6 jam.
Perubahan nilai arus sepanjang tempoh penganodan direkodkan. Selepas
penyingkiran lapisan oksida, kualiti cekung yang terbentuk dikaji
menggunakan FESEM.
Mikrograf FESEM mengesahkan pembentukan cekung berstruktur heksagon
adalah seragam. Selain memperbaiki keseragaman, pertambahan tempoh
penganodan telah membentuk cekung yang lebih jelas, tersusun serta
kecacatan yang minimum. Keputusan kajian mendapati bahawa tempoh
optimum bagi mendapatkan cekung yang seragam dan sempurna adalah
antara 4 dan 6 jam. Ini kerana pertambahan tempoh penganodan seterusnya
akan menyebabkan keruntuhan dinding cekung yang akhirnya menjadi
punca kepada pembentukan liang yang bersentuhan antara satu sama
lain. Selain itu, mekanisma penghasilan bentuk cekung turut dibincangkan. Kata kunci: AAO;
cekung; heksagon; pra-pembentukan; seragam ABSTRACT The quality of the AAO
membrane prepared using two-step anodization technique
is strongly influenced by the pre-textured concave indented during
the first-step of anodization. This work was conducted to determine
the optimum duration of anodization to produce a high quality
of concaves. The anodization process was conducted using 0.3 M
H2C2O4 solution
as an electrolyte at 40 V and 18°C applied voltage and temperature,
respectively. Anodizing process was performed up to 6 h. The changes
of the current during anodization process was recorded. After
removal of the resulting oxide layer, the concaves formed were
studied using FESEM.
FESEM
micrograph confirmed the formation of a uniform
hexagonal concaves. Beside improving the uniformity, the extension
of anodizing duration formed a well-defined arrangement of concaves
with minimum defects. This work found that the optimum period
to obtain a uniform and perfect concaves is between 4 and 6 h.
This is because the extension of anodizing period caused the wall
to collapse and creating larger, irregular pores. In addition,
the underlying mechanism for concave formation was described in
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