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Malik Anjelh Baqiya Malik Anjelh Baqiya
Department of Physics, Institut Teknologi Sepuluh Nopember, Kampus ITS-Sukolilo Surabaya
Physics

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A Structural Investigation of T’-Pr2-xCexCuO4 nanocrystals with x = 0.13: Putu Eka Dharma Putra, I Gede Arjana, Budi Haryanto, Resky Irfanita, Malik Anjelh Baqiya, Darminto Darminto Putu Eka Dharma Putra Putu Eka Dharma Putra; I Gede Arjana I Gede Arjana; Budi Hariyanto Budi Hariyanto; Resky Irfanita Resky Irfanita; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 17 No 3 (2021): October 2021 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i3.9720

Abstract

This report is briefly investigating the structural defect information of T’-Pr2-xCexCuO4 (T’-PCCO) nanocrystals with x = 0.13 at three different calcination temperatures. The as-synthesized powder of Pr2-xCexCuO4 (PCCO) nanocrystals with x = 0.13 were synthesized by using the chemically dissolved method within three different calcination temperatures, namely 900oC, 950oC, and 1000oC for 15 h in air. X-ray diffraction (XRD) technique is used to characterize the phase, structural, and crystalline defect information on the nanocrystal powder. It is found that all the indexed peaks are confirmed as PCCO phase with space group of I4/mmm and a minor impurity of Fm-3m space group. The lattice parameters are confirmed to be fluctuated signifying the stability of the Coulomb force at those temperatures. The post-Rietveld analysis using Bond Valance Sum (BVS) calculation shows the Ce-dependent of T’-PCCO nanocrystals while the Fourier difference suggests that the created crystalline defect as a part of the tetravalent doping effect which binds stronger apical oxygen. Moreover, at Pr- and Cu-site, the scattering distribution are fluctuating with the stable structure at 1000oC. This initial structural information is worth complementing the fundamental feature for understanding the T’-type cuprates.
Physical Properties Comparison of rGO-like phase prepared from Coconut Shell and the Commercial Product: Retno Asih, Maya Mahirotul Septya, Erik Bhekti Yutomo, Fahmi Astuti, Malik Anjelh Baqiya, Darminto Darminto Retno Asih Retno Asih; Maya Mahirotul Septya Maya Mahirotul Septya; Erik Bhekti Yutomo Erik Bhekti Yutomo; Fahmi Astuti Fahmi Astuti; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6712

Abstract

Physical properties of reduced graphene oxide (rGO) prepared from two different raw materials, namely coconut shell (rGO-s) and graphite mineral (rGO-c, produced by Graphenea Inc.), have been investigated. While both samples have the same density of about 1.9 g/cm3, rGO-c has more porous of about 1.3 cc/g with diameter of 10.8 nm compared to rGO-s which has 0.2 cc/g porous with diameter of 2.4 nm. Specific surface area in rGO-c was also obtained much larger than that of rGO-s. rGO-c and rGO-s have specific surface area of ~298 m2/g and ~475 m2/g, respectively. Examinations on particle size and surface morphology show that rGO-c has homogenous particles which consist of transparent thin sheets, while rGO-s has rather heterogenous particles that look like dens stacked sheets. The presence of C and O was confirmed at the observed morphology. The difference in physical features were then found to influence the obtained electrical conductivity of the samples. rGO-c has higher conductivity than rGO-s. Estimation on gap energy (Eg) indicates that rGO-c and rGO-s have Eg in the range of semiconducting materials. The study provides a better understanding on physical properties of coconut shell-derived rGO to further revise synthesis method to improve quality of the obtained rGO.
Study of the Formation of Amorphous Carbon and rGO-like Phases from Palmyra Sugar by Variation of Calcination Temperature: Fahmi Astuti, Novita Sari, Vera Laviara Maghfirohtuzzoimah, Retno Asih, Malik Anjelh Baqiya, Darminto Darminto Fahmi Astuti Fahmi Astuti; Novita Sari Novita Sari; Vera Laviara Maghfirohtuzzoimah Vera Laviara Maghfirohtuzzoimah; Retno Asih Retno Asih; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6706

Abstract

We have processed biomass from palmyra sugar to produce allotrope carbon by heating process with the variation of calcination temperature. The formation of amorphous carbon (a-C) was confirmed from the XRD result heated at 400°C with the observation of the peak at the position of ~24o. By increasing the temperature at 700°C, the presence of two peaks at 24o and 43o were observed, indicating the formation of rGO-like phase. The functional groups detected by FTIR spectra consist of C=C, C-O, C=O, C-H and O-H. The result of conductivity measurement exhibits that the material can be classified as semiconducting materials.
Efek Staebler-Wronski dan Pengaruh Waktu Anil pada Lapisan Instrinsik Silikon Amorf Terhidrogenasi (a-Si:H): Yoyok Cahyono, Fuad D. Muttaqin, Umi Maslakah, Malik A. Baqiya, Mochamad Zainuri, Eddy Yahya, Suminar Pratapa, Darminto Darminto Yoyok Cahyono Yoyok Cahyono; Fuad D. Muttaqin Fuad D. Muttaqin; Umi Maslakah Umi Maslakah; Malik Anjelh Baqiya Malik Anjelh Baqiya
Jurnal Fisika dan Aplikasinya Vol 13 No 2 (2017): June 2017 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v13i2.2299

Abstract

Hydrogenated amorphous silicon (a-Si:H) is one of the most promising solar cell materials, as compared to the crystalline silicon (c-Si). This material has a greater absorption with less material requirement (thin). So it is expected to reduce the cost of production and price of solar cells. But until now there are still many unresolved issues, especially with regard to low efficiency, and the Staebler-Wronski effect. This study aims to describe the effect of Staebler-Wronski, which is the effect of long-time exposure to heat on the layer of solar cell material by means of annealing treatment. The results show that the longer annealing time, there is a tendency to decrease transmittance, which is thought to be caused by changes in crystallinity, energy band gap, Urbach energy and particle size. The increasing annealing time can lead to the release of hydrogen bonds that cause an increase in localized state, due to the activation of the dangling bond which is the main cause of the Staebler-Wronski effect.
Structural and Morphological Studies of Lava Rock from Mount Gamalama Ternate for Possible Functional Materials Applications: Malik Anjelh Baqiya, Iqbal Limatahu, Muhammad Nasrun, Darminto Malik Anjelh Baqiya Malik Anjelh Baqiya; Iqbal Limatahu Iqbal Limatahu; Muhammad Nasrun Muhammad Nasrun; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 13 No 1 (2017): January 2017 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v13i1.2134

Abstract

A large eruption of Mount Gamalama happened nearly 350 years ago has left the frozen lava rocks that are now spread in the form of black stone located in the North-East coast of the island of Ternate, called batu angus (Angus stone). This paper reports the basic analysis including the phase content, crystal structure and particle morphology of the frozen lava rock, Angus stone, briefly. Based on the XRD pattern, Angus stone contains up to 20% of magnetic phases. The analysis of XRF and XRD data reveals that there are dominantly non-magnetic phases (silicate phases) in the Angus stone with the combination of Si-Al-K-Ca-O elements. Elemental distribution map from SEM/EDX image shows that there is a clear separation between non-magnetic and magnetic phases in the crushed powders indicating the easiness to obtain both phases separately. This study proves that Angus stone has potential application as a base material for the preparation of magnetic and non-magnetic functional materials.
Co-Authors Budi Hariyanto Budi Hariyanto Darminto Darminto Darminto Darminto Erik Bhekti Yutomo Erik Bhekti Yutomo Fahmi Astuti Fahmi Astuti Fahmi Astuti Fahmi Astuti Fuad D. Muttaqin Fuad D. Muttaqin I Gede Arjana I Gede Arjana Iqbal Limatahu Iqbal Limatahu Maya Mahirotul Septya Maya Mahirotul Septya Muhammad Nasrun Muhammad Nasrun Novita Sari Novita Sari Putu Eka Dharma Putra Putu Eka Dharma Putra Resky Irfanita Resky Irfanita Retno Asih Retno Asih Umi Maslakah Umi Maslakah Vera Laviara Maghfirohtuzzoimah Vera Laviara Maghfirohtuzzoimah Yoyok Cahyono Yoyok Cahyono