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All Journal Journal of Natural Sciences and Mathematics Research Makara Journal of Science
Mohamad Rusop Mahmood, Mohamad Rusop
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology Physics

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Effect of Growth Pressure on Structural Properties of SiC Film Grown on Insulator by Utilizing Graphene as a Buffer Layer Astuti, Budi; Abd Rahman, Shaharin Fadzli; Tanikawa, Masahiro; Mahmood, Mohamad Rusop; Yasui, Kanji; Manaf Hashim, Abdul
Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015
Publisher : Faculty of Science and Technology, State Islamic University Walisongo Central Java

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (72.184 KB) | DOI: 10.21580/jnsmr.2015.1.1.476

Abstract

Heteroepitaxial growth of silicon carbide (SiC) on graphene/SiO2/Si substrates was carried out using a home-made hot-mesh chemical vapor deposition (HM-CVD) apparatus. Monomethylsilane (MMS) was used as single source gas while hydrogen (H2) as carrier gas. The substrate temperature, tungsten mesh temperature, H2 flow rate and distance between mesh and substrate were fixed at 750 °C, 1700 °C, 100 sccm and 30 mm, respectively. The growth pressures were set to 1.2, 1.8 and 2.4 Torr. The growth of 3C-SiC (111) on graphene/SiO2/Si were confirmed by the observation of θ-2θ diffraction peak at 35.68°. The diffraction peak of thin film on graphene/SiO2/Si substrate at pressure growth is 1.8 Torr is relatively more intense and sharper than thin film grown at pressure growth 1.2 and 2.4 Torr, thus indicates that the quality of grown film at 1.8 Torr is better. The sharp and strong peak at 33° was observed on the all film grown, that peak was attributed Si(200) nanocrystal. The reason why Si (200) nanocrystal layer is formed is not understood. In principle, it can’t be denied that the low quality of the grown thin film is influenced by the capability of our home-made apparatus. However, we believe that the quality can be further increased by the improvement of apparatus design. As a conclusion, the growth pressures around 1.8 Torr seems to be the best pressures for the growth of heteroepitaxial 3C-SiC thin film.
Effect of Niobium Dopant on ZnO Thin Films Prepared via the Sol–gel Spin Coating Method Eswar, Kevin Alvin; Rostan, Nur Fairuz; Mohamad, Maryam; Md Akhir, Rabiatuladawiyah; Rasmidi, Rosfayanti; Guliling, Muliyadi; Azhar, Najwa Ezira; Buniyamin, Irmaizatussyehdany; Malek, Mohd Firdaus; Mahmood, Mohamad Rusop; Suhaimi, Husairi Fadzilah; Abdullah, Saifollah
Makara Journal of Science Vol. 29, No. 1
Publisher : UI Scholars Hub

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Abstract

Thin films of zinc oxide (ZnO) and niobium (Nb)-doped ZnO were deposited on a glass substrate using the sol–gel spin coating method. Diethanolamine, isopropyl alcohol, and zinc acetate served as the stabilizers, solvent, and starting ma-terial, respectively. Niobium pentachloride was employed as the dopant source. Energy-dispersive X-ray analysis con-firmed Nb incorporation. Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and ultravio-let–visible spectroscopy (UV–Vis) analyses characterized the morphology, structure, and optics of the films, respective-ly. Both films, comprising nanoparticles, were visible in FESEM. Nb doping reduced the particle size from 44.2 nm to 35.8 nm. The XRD peaks at 31.23°, 33.48°, and 35.7° indicate the (100), (002), and (101) orientations, respectively. Nb-doped ZnO exhibited enhanced visible-range transmission in UV–Vis analysis. However, UV spectrum transmission significantly decreased. Nb doping reduced the optical bandgap of ZnO from 3.30 eV to 3.27 eV.
Co-Authors Abdul Manaf Hashim, Abdul Abdullah, Saifollah Azhar, Najwa Ezira Budi Astuti Buniyamin, Irmaizatussyehdany Eswar, Kevin Alvin Guliling, Muliyadi Kanji Yasui, Kanji Malek, Mohd Firdaus Masahiro Tanikawa, Masahiro Md Akhir, Rabiatuladawiyah Mohamad, Maryam Rasmidi, Rosfayanti Rostan, Nur Fairuz Shaharin Fadzli Abd Rahman, Shaharin Fadzli Suhaimi, Husairi Fadzilah