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All Journal Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Abu Bakar, Suriani
Faculty of Mathematics and Natural Science, Universitas PGRI Palembang
Agriculture, Biological Sciences & Forestry Chemistry Mathematics Physics

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HYDROTHERMAL GROWTH AND SQUEEGEE METHOD IN THE FABRICATION OF MIXED-PHASE TiO2 NANOSTRUCTURES Muqoyyanah, Muqoyyanah; Abu Bakar, Suriani; Mohamed, Azmi; Hashim, Norhayati; Mamat, Mohamad Hafiz; Malek, Mohamad Firdaus; Ahmad, Mohamad Khairul
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 13 No. 2 Desember 2016
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (866.309 KB) | DOI: 10.31851/sainmatika.v13i2.966

Abstract

In this work, the modification of TiO2 nanostructures based on its morphology and crystallinity phase were fabricated using a simple method. Hydrothermal growth method was used to synthesize nanorods and nanoflowers, while nanoparticles was applied using squeegee method. The average length and diameter of the as-grown nanorods were 3.5 and 46-215 nm, respectively. Meanwhile, the average total thickness and band gap value of mixed-phase TiO2 nanostructures were 15.98-24.54 nm and 2.84 eV, respectively. Based on its structural and electrical properties, the fabricated film has great potential to be applied as photoanode semiconductor layer for dye-sensitized solar cells application. Key words: TiO2, Nanostructures, Mixed-phase, Hydrothermal, Squeegee
TIME EVOLUTION OF THE GROWTH OF VERTICALLY ALIGNED CARBON NANOTUBES USING PALM OIL Abu Bakar, Suriani
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 14 No. 1 Juni 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1008.151 KB) | DOI: 10.31851/sainmatika.v14i1.1105

Abstract

We studied the change in morphology and microstructure of carbon nanotubes (CNT) grown for 5, 10, 15, 20, 25, 30, 35 and 40 mins respectively. The CNT was fabricated from palm oil using thermal chemical vapor deposition method at fixed synthesis temperature of 750°C in argon ambient. The samples were analyzed using field emission scanning electron microscopy and micro-Raman spectroscopy. At 5 min of growing time, a very thin layer of CNT was produced without any vertical growth of CNT. The tube walls were also defective and coated with amorphous carbon. The vertically aligned CNT (VACNT) was initially observed at 10 min synthesis time and the length increases with prolonged synthesis time at various growth rate. It should also be highlighted that as the nanotubes get longer and thickens with time, the development of secondary growth structures was also spotted particularly for synthesis time more than 30 min. From Energy-dispersive X-ray spectroscopy analysis, it is justifiable that the generation of secondary growth came from the raised catalyst. As a conclusion, it can be said that, the optimum synthesis time for higher growth rate VACNT, smaller diameter and mix with single-walled CNT, low ID/IG ratio was identified at 30 min time.Key words: Nanotubes, Chemical synthesis method, Scanning electron microscopy (SEM) and Raman spectra.ABSTRAK Kami mengkaji perubahan morfologi dan struktur mikro tabung nano karbon (CNT) yang ditumbuhkan selama 5, 10, 15, 20, 25, 30, 35 dan 40 menit. CNT difabrikasi dari minyak sawit menggunakan metode deposisi uap kimia termal pada suhu sintesis 750 °C dalam lingkungan argon. Sampel dianalisis menggunakan mikroskop elektron dan spektroskopi mikro-Raman. Pada waktu pertumbuhan 5 menit, diperoleh lapisan CNT yang sangat tipis tanpa pertumbuhan vertikal CNT. Dinding tabung juga rusak dan dilapisi dengan karbon amorf. Pertumbuhan CNT vertikal sejajar (VACNT) pada awalnya teramati pada waktu sintesis 10 menit dan panjangnya bertambah seiring dengan perpanjangan waktu sintesis di berbagai tingkat pertumbuhan. Harus digarisbawahi pula bahwa semakin panjang dan tebal tabung nano seiring bertambahnya waktu, perkembangan struktur pertumbuhan sekunder juga terlihat terutama untuk waktu sintesis lebih dari 30 menit. Dari analisis spektroskopi energi dispersif sinar-X, terlihat bahwa generasi pertumbuhan sekunder berasal dari katalis yang terangkat. Sebagai kesimpulan, dapat dikatakan bahwa waktu sintesis optimal untuk tingkat pertumbuhan VACNT yang lebih tinggi, diameter lebih kecil, bercampur dengan CNT berdinding tunggal, dan rasio ID/IG rendah diidentifikasi pada 30 waktu menit.Kata Kunci: tabung nano karbon, metode sintesis kimiawi, mikroskop electron (SEM), spectrum Raman
PREPARATION OF LAYERED MATERIAL Zn/Al-LAYERED DOUBLE HYDROXIDE-FERULATE NANOCOMPOSITES Muda, Zuhailimuna; Hashim, Norhayati; Md Isa, Illyas; Mohd Ali, Noorshida; Abu Bakar, Suriani; Kamari, Azlan; Mohamed, Azmi
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 13 No. 2 Desember 2016
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (773.31 KB) | DOI: 10.31851/sainmatika.v13i2.1001

Abstract

A new layered material-drug nanocomposite namely, Zn/Al-layered double hydroxide-ferulate (Zn/Al-LDH-FA) has been synthesized using the ion exchange method. PXRD pattern and elemental analysis showed that Zn/Al-LDH-FA nanocomposite yielded high crystalline and pure phase material with a basal spacing of 17.4 Å and anion loading of 35.9 % respectively. The FTIR spectra reveal the presence of FA in the interlayer of Zn/Al-LDH, while the thermal analysis shows that the Zn/Al-LDH has enhanced the thermal stability of FA in the interlayer compared to its pure form. Anionic FA intercalated into the interlayer of Zn/Al-LDH as vertical monolayer with the carboxylate groups pointing towards the Zn/Al-LDHs layers. The intercalation of FA into the interlayer of Zn/Al-LDH is also supported by morphology analysis, FESEM.Keywords: Synthesis, Intercalation, Layered Double Hydroxide, Ferulic AcidABSTRAKSebuah bahan-obat berlapis nanokomposit baru yaitu, Zn/Al-berlapis ganda hidroksida-ferulate (Zn/Al-LDH-FA) telah disintesis dengan menggunakan metode pertukaran ion. Pola PXRD dan analisis unsur menunjukkan bahwa Zn/Al-LDH-FA nanokomposit menghasilkan kristalinitas tinggi dan material fase murni dengan jarak basal dari 17,4 Å dan pemuatan anion 35,9%. Spektrum FTIR mengungkapkan adanya FA di lapisan Zn/Al-LDH, sedangkan analisis termal menunjukkan bahwa Zn/Al-LDH telah meningkatkan stabilitas termal FA di antar lapisan dibandingkan dengan bentuk murninya. Anionik FA diselingi ke dalam interlayer Zn/Al-LDH sebagai monolayer vertikal dengan gugus karboksilat menunjuk ke arah lapisan Zn/Al-LDHs. Interkalasi dari FA ke dalam interlayer Zn/Al-LDH juga didukung oleh analisis morfologi, FESEM.Kata kunci: Sintesis, interkalasi, hidroksida berlapis ganda, asam ferulic
PEMANFAATAN MINYAK PELUMAS BEKAS UNTUK FABRIKASI BOLA KARBON MIKRO MENGGUNAKAN METODE DEPOSISI UAP KIMIA TERMAL Alfarisa, Suhufa; Abu Bakar, Suriani
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 13 No. 1 Juni 2016
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v13i1.961

Abstract

Carbon microspheres (C-mS) were successfully synthesized from used lube oil as the carbon source using thermal chemical vapor deposition method. The nature present of carbon content in used lube oil promoted the growth of C-mS. The oil mixed with 5,33 wt% of ferrocene catalyst was initially heated at 450 °C in the precursor furnace and then transferred into deposition furnace at 900 °C by the flow of argon carrier gas. The collected sample was then analyzed using field emission scanning electron microscope (FESEM) and micro-Raman spectroscopy. The current-voltage (IV) profile of the C-mS was also studied using four-point probe measurement. FESEM and micro-Raman analyses showed the production of high density C-mS with diameter range of 0,57 – 3,14 mm and ID/IG ratio of 0,95. Semiconductor characteristic was observed from IV measurement indicated that the C-mS synthesized from used lube oil has potential to be applied in electronic devices. This study noted that the used lube oil can be used as an economical carbon source to replace the conventional chemical precursor to produce high quality carbon material. On the other hand, it also offered a new utilization of used lube oil which can be harmful to our environment.Keywords: carbon microspheres, used lube oil, chemical vapor depositionABSTRAKBola karbon mikro berhasil disentesis dari minyak pelumas bekas sebagai sebagai sumber karbon menggunakan metode deposisi uap kimia termal. Keberadaan alami dari kandungan karbon di dalam minyak pelumas menyebabkan pertumbuhan bola karbon mikro. Pelumas yang dicampur dengan katalis ferosen dengan konsentrasi 5,33 %b mula-mula dipanaskan pada suhu 450 °C di dalam pemanas prekursor, kemudian ditranfer ke pemanas deposisi ada suhu 900 °C melalui aliran gas argon. Sampel yang terkumpul kemudian dianalisis menggunakan mikroskop elektron emisi medan (FESEM) dan spektroskopi mikro-Raman. Profil arus-tegangan (IV) dari bola karbon mikro juga dipelajari menggunakan pengukuran probe empat titik. Analisis FESEM dan mikro-Raman menunjukkan produksi bola karbon mikro dengan kerapatan tinggi dengan rentang diameter antara 0,57 – 3,14 mm dan rasio ID/IG sebesar 0,95. Karakteristik Schottky teramati dari pengukuran IV yang mengindikasikan bahwa bola karbon mikro yang disintesis dari minyak pelumas bekas memiliki potensi untuk diaplikasikan di dalam piranti elektronik. Kajian ini juga menunjukkan bahwa minyak pelumas bekas bisa dimanfaatkan sebagai sumber karbon ekonomis untuk menggantikan prekursor kimia konvensional untuk menghasilkan material karbon berkualitas tinggi. Di sisi lain, kajian ini juga menawarkan pemanfaatan baru dari minyak pelumas bekas yang bisa berbahaya bagi lingkungan. Kata kunci: bola karbon mikro, minyak pelumas bekas, deposisi uap kimia
THE USE OF TRIPLE-TAILS CUSTOM-MADE SURFACTANT IN THE PRODUCTION OF GRAPHENE OXIDE THIN FILM AS TRANSPARENT CONDUCTIVE ELECTRODE Muqoyyanah, Muqoyyanah; Abu Bakar, Suriani; Mohamed, Azmi; Hashim, Norhayati; Mamat, Mohamad Hafiz; Malek, Mohamad Firdaus; Ahmad, Mohamad Khairul
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 14 No. 1 Juni 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (809.406 KB) | DOI: 10.31851/sainmatika.v14i1.1107

Abstract

In this work, graphene oxide (GO) and reduced GO (rGO) thin films were fabricated from GO and rGO using the custom-made and commercial surfactants, which were sodium 1,4-bis (neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulphonate and sodium dodecyl sulphate, respectively. The GO solution was synthesized using electrochemical exfoliation method followed by reduction process utilizing hydrazine hydrate to produce rGO solution. The GO and rGO transfer process were done using spraying deposition method on fluorine-doped tin oxide substrate. The fabricated GO and rGO thin films consists of several layers resulted in high transparency over 85% with maximum transmittance of 93.69%. Based on several characterizations, the fabricated GO and rGO thin films have potential to be applied as transparent conductive electrode.Key words: Custom-made, Surfactant, Electrochemical, Spraying, Electrode. ABSTRAKDalam penelitian ini, film tipis grafin oksida (GO) dan grafin oksida yang direduksi (rGO) difabrikasi dari GO dan rGO menggunakan surfaktan yang dibuat khusus dan surfaktan komersial yaitu secara berurutan adalah sodium 1,4-bis (neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulphonate dan sodium dodecyl sulphate. Larutan GO disintesis menggunakan metode eksfoliasi elektrokimia diikuti dengan proses reduksi menggunakan hidrazin hidrat untuk menghasilkan larutan rGO. Proses transfer GO dan RGO dilakukan dengan menggunakan metode deposisi penyemprotan diatas substrat oksida timah oksida dengan doping florin. Film tipis GO dan rGO yang difabrikasi terdiri dari beberapa lapis dengan transparansi tinggi mencapai 85% dengan transmitansi maksimum sebesar 93,69%. Berdasarkan beberapa karakterisasi, film tipis GO dan rGO ini memiliki potensi untuk diaplikasikan sebagai elektroda konduktif transparan.Kata Kunci: dibuat khusus, surfaktan, elektrokimia, penyemprotan, elektroda
THE STRUCTURAL PROPERTIES OF GRAPHENE OXIDE AND REDUCED GRAPHENE OXIDE GROWN ON STAINLESS STEEL SUBSTRATE Zaid, Kyairi; Abu Bakar, Suriani; Muqoyyanah, Muqoyyanah
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 14 No. 2 Desember 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (723.834 KB) | DOI: 10.31851/sainmatika.v14i2.1295

Abstract

In this paper, the structural properties of graphene oxide (GO) and reduced graphene oxide (rGO) based on custom-made, sodium 1,4-bis (neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulphonate (TC14) surfactant were investigated. GO was synthesized by electrochemical exfoliation and chemical reduction process utilizing hydrazine hydrate was further done to produce rGO. The obtained GO and rGO solution were then transferred to stainless steel substrate by spraying deposition method. Based on several characterizations, the fabricated film has potential to be used as electrode for water treatment application. Key words: Graphene Oxide, Reduced Graphene Oxide, Stainless Steel, Electrochemical, Spraying. ABSTRAK Dalam artikel ini diteliti sifat struktural dari oksida grafin (GO) dan oksida grafin yang direduksi (rGO) menggunakan surfaktan sodium 1,4-bis (neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulphonate (TC14) yang dibuat khusus. GO disintesis menggunakan eksfoliasi elektrokimia dan proses reduksi kimiawi menggunakan hidrazin hidrat untuk menghasilkan rGO. Larutan GO dan rGO yang dihasilkan kemudian ditransfer ke substrat stainless steel degan metode deposisi penyemprotan. Berdasarkan beberapa karakterisasi, film yang difabrikasi memiliki potensi untuk digunakan sebagai elektroda untuk aplikasi pengolahan air. Kata kunci: Oksida grafin, oksida grafin direduksi, stainless steel, elektrokimia, penyemprotan
FIELD ELECTRON EMISSION PROPERTIES OF VERTICALLY ALIGNED CARBON NANOTUBES SYNTHESIZED FROM PALM OIL PRECURSOR Abu Bakar, Suriani
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 13 No. 2 Desember 2016
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1519.246 KB) | DOI: 10.31851/sainmatika.v13i2.965

Abstract

Vertically aligned carbon nanotubes (VACNT) synthesized at different ferrocene concentration by thermal decomposition of bio-hydrocarbon source namely palm oil were investigated for field electron emission application. The ferrocene concentration ranges from 0.5 to 3.5 wt% and the as-prepared VACNT were characterized using field emission scanning electron microscopy and micro-Raman spectroscopy. It was clearly shown that a controlled increase in the mixture of ferrocene and palm oil was important in improving field emission behaviour. The samples synthesized using 2.5 wt% ferrocene concentration proves to be the optimum concentration as for lowest turn-on (corresponding to the current density of 0.1 mAcm-2) and threshold field (corresponding to the current density of 1 mAcm-2) at 3.17 and 4.07 Vµm-1 respectively in comparison with other concentration. The sample also demonstrates highest peak current of 8.0 mAcm-2 at a field of 5.5 Vµm-1 as well as less degradation during one hour emission stability testing. Key words: Carbon Nanotubes, Palm oil, Chemical vapor deposition, Field electron emission, Scanning electron microscopy, Raman spectra, catalytic methods.
THE STRUCTURAL PROPERTIES OF ZnO/TiO2 BILAYER THIN FILM AS PHOTOANODE Fatiatun, Fatiatun; Abu Bakar, Suriani; Mohamed, Azmi; Hashim, Norhayati; Mamat, Mohamad Hafiz; Malek, Mohamad Firdaus
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Sainmatika Volume 14 No. 1 Juni 2017
Publisher : Faculty of Mathematics and Natural Science, Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (705.43 KB) | DOI: 10.31851/sainmatika.v14i1.1108

Abstract

   The ZnO/TiO2 bilayer was fabricated on the fluorine-doped tin oxide (FTO) substrate. The ZnO nanorods and TiO2 nanoparticles were developed as photoanode material that were fabricated by using sol-gel immersion and squeegee method. The structure of ZnO/TiO2 bilayer showed a good properties for photoanode in DSSCs application. The ZnO/TiO2 bilayer has large surface area that could increase a dye loading and performance of photoanode. Meanwhile, the micro-Raman spectra of ZnO/TiO2 bilayer indicated a good crystallinity. Therefore, the ZnO/TiO2 bilayer showed a good structure for photoanode in DSSCs application.Key words: ZnO nanorods, TiO2 nanoparticles, ZnO/TiO2 bilayer, Photoanode ABSTRAKLapisan ZnO/TiO2 difabrikasi di atas substrat oksida timah yang di doping florin (FTO). Batang nano ZnO dan partikel nano TiO2 dikembangkan sebagai material fotoanoda yang difabrikasi menggunakan metode pencelupan sol-gel dan squeegee. Struktur lapisan ZnO/TiO2menunjukkan sifat fotoanoda yang baik dalam aplikasi DSSCs. Lapisan ZnO/TiO2memiliki luas permukaan yang besar yang bisa meningkatkan muatan dye dan performa fotoanoda. Sedangkan spktrum mikro-Raman lapisan ZnO/TiO2mengindikasikan kristalinitas yang bagus. Oleh karena itu, lapisan ZnO/TiO2menunjukkan struktur yang baik untuk fotoanoda di dalam aplikasi DSSCs.Kata Kunci: batang nano ZnO, partikel nano TiO2, lapisan ZnO/TiO2, fotoanoda
Co-Authors Ahmad, Mohamad Khairul Alfarisa, Suhufa Fatiatun, Fatiatun Hashim, Norhayati Kamari, Azlan Malek, Mohamad Firdaus Mamat, Mohamad Hafiz Md Isa, Illyas Mohamed, Azmi Mohd Ali, Noorshida Muda, Zuhailimuna Muqoyyanah, Muqoyyanah Zaid, Kyairi