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All Journal JPSE (Journal of Physical Science and Engineering) Science and Technology Indonesia Indonesian Physical Review Dedikasi: Jurnal Pengabdian Masyarakat Newton-Maxwell Journal of Physics Jurnal Pengabdian Inovasi Masyarakat Indonesia Narra X Classroom Experiences Socio-Economic and Humanistic Aspects for Township and Industry Asskruie Frontier Advances in Applied Science and Engineering Education Specialist Media for Empowerment, Mobilization, and Innovation in Research & Community
Kormil Saputra
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Journal : Science and Technology Indonesia

 1 
Tapping into the Power of Sol-Gel Method for Enhanced Antimicrobial Activity of Titania Nanoparticles Saputra, Kormil; Masruroh, Masruroh; Susanto, Hendra; Apsari, Retna
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.546-555

Abstract

Increasing bacterial resistance to antibiotics has become a serious threat to global public health. In this context, this study aims to evaluate the antimicrobial activity of titanium dioxide nanoparticles (TiO2 NPS) synthesized using the sol-gel method. TiO2 NPS samples were prepared and characterized for morphology via field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) analysis. Kirby-Bauer disc diffusion method was used to test the antimicrobial activity of TiO2 NPS against Gram positive bacteria Staphylococcus aureus, Gram negative bacteria Escherichia coli, and pathogenic fungus Aspergillus penicillioides. The results showed that TiO2 NPS effectively inhibited the growth of microorganisms, with significant inhibition zones especially against fungi. The antimicrobial mechanism of TiO2 NPS involves the formation of hydroxyl radicals and superoxide ions that damage the cell membrane of microorganisms. The implications of this study are the development of potential antimicrobial nanomaterials for biomedical and environmental applications, as well as the importance of considering the physical and chemical properties of TiO2 NPS in designing effective infection treatment strategies.
Corn-Cob-Waste-Based Fe2.75Mn0.25O4/rGO Nanocomposite Application as Anti-Radar Coatings Saefullah, Lalu; Kormil Saputra; Wida Puteri Agista; Masruroh; Dionysius J. D. H. Santjojo; Istiroyah
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.798-805

Abstract

Radar-absorbent materials (RAMs) have become essential technologies in fields that require them, such as the military. Their working principle is that they absorb electromagnetic waves and prevent their reflection. In developing the manufacturing of RAMs, high-performance materials are needed for effective use as RAMs. In general, RAMs possess two essential properties: magnetic and dielectric. This research reports the author’s successful synthesis of an Fe2.75Mn0.25O4/rGO nanocomposite as an anti-radar material using the coprecipitation method. Interestingly, the main precursors used were natural materials, namely iron sand and corn cob waste. XRD, FTIR, and SEM-EDX characterized the research samples to determine the nanocomposite’s structure and phase, functional groups, and morphology after doping. XRD characterization results showed that Fe2.75Mn0.25O4/rGO nanoparticles had a cubic crystal structure and that there were no new peaks, which indicates that Mn had been successfully substituted into Fe. FTIR test results showed that the Fe2.75Mn0.25O4/rGO nanocomposite had Mn and Fe-O functional groups in octahedral and tetrahedral positions at wave numbers of 418 480 cm-1 and that there were C=C functional groups at the wave number of 1629 cm-1. SEM results showed that the nanocomposite comprised Fe2.75Mn0.25O4/rGO particles in agglomerated spheres and corn-cob-based rGO in sheet form, with a grain size of around 26–31 nm. EDX test results showed the appearance of Fe, Mn, O, and C elements. It was also found that the 3-mm-thick Fe2.75Mn0.25O4/rGO nanocomposite sample achieved the highest reflection loss (RL) value of -43.6 dB at a frequency of 8.5 GHz, indicating a significant radar wave absorption capability.
Synthesis and Characterization of TiO2/CaTiO3 Perovskite Composite Derived from Pinctada maxima Shell Waste Kurniawidi, Dian W.; Rahayu, Susi; Budianto, Arif; Saputra, Kormil; Agista, Wida Puteri; Suprayogi, Thatit; Marlina, Resti
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.3.924-942

Abstract

This study has succeeded in synthesizing and characterizing TiO2/CaTiO3 perovskite composites using calcium carbonate (CaCO3) from shellfish waste (Pinctada maxima). Synthesis was carried out through the coprecipitation method with variations in the molar ratio of CaCO3:TiO2 and calcination temperatures (700oC, 800oC, and 900oC). Characterization was carried out using FTIR, DTA-TG, XRD, SEM-EDS, BET and UV-Vis. The results of the analysis showed that the calcination temperature affected the powder color, crystal structure, thermal properties and particle size. The DTA-TG analysis shows that increasing the calcination temperature up to 900oC significantly reduces mass loss to 51.88%, with minimal thermal events, indicating the formation of a thermally stable and well-crystallized TiO2/CaTiO3 structure. At a temperature of 900oC, a more perfect CaTiO3 was formed with the whitest powder color, the anatase and brookite phases of TiO2 were still detected, while the calcite phase was still found at a temperature of 700oC. The morphology of the samples showed agglomeration with increasingly uniform particle sizes at higher calcination temperatures. Complementary BET analysis confirms that the composite possesses a mesoporous structure with a specific surface area of 11.42 m2/g and a pore size distribution of 3-5 nm, making it suitable for adsorption and photocatalytic applications. UV-Vis analysis showed an increase in the band gap value along with the increase in the TiO2 ratio. This is also confirmed by the presence of Urbach energy which tends to increase with increasing TiO2 ratio.
Co-Authors Adella Ulyandana Jayarti Adella Ulyandana Jayatri Aditya Yoga Purnama Agista, Wida Puteri Agness Claundya NT Ahmad Rifaldi Arahman Ahmad Taufiq Ahmad Zarkasi Ainiyah Fatin Alfina Taurida Alaydrus Alifni Aulia Amirin Kusmiran Anggun Almadani Anisa Anisa Apriani Apriani Arif Budianto Arif Hidayat Arin Artha Callista Ariyanthi, Gita Putri Ayu Mona Erisa Marpaung Baiq Adilya Putri Humaira Fatarani Baiq Laelatin Diniati Baiq Nabila Nasywa Baiq Revalina Restu Khaunifar Bakti Sukrisna Cahaya Rizkika Imanda Chanakan Sojayapan Chusna, Nadiya Miftachul Deatun Zahra Dewi Kgajar Fitriana Dian W. Kurniawidi Dian Wijaya Kurniawidi Dimas Mahendra Dionysius J. D. H. Santjojo Dwi Septia Kari Elen Renata Putra Fajariman, Ilham Dias Fatima Naimi Fauziana Hidayat Fina Nahdia Fitri Gina Fadilla Gusti Ayu Niatri Halia Safitri Handriani, Handriani Hendra Susanto I Wayan Sudiarta Ika Umratul Asni Aminy Indah Nur Gusfiana Indrawan Eka Badri Istiroyah Kholis Nurhanafi Khuzaima, Nabila D. Kurniawan, Bakhrul Rizky Kurniawidi, Dian W. Laili Hidayati Laksono, Yoyok Adi Setio Luluk Tsaroya Zarkasyi Madani, Awanda OP. Maratus Soleha Markus Diantoro Marlina, Resti Marzuki Marzuki Masruroh Masruroh MASRUROH Melani Melani Mira Suhada Mislan Mohammad Asrul Muhammad Hardiansyah Muhammad Ihzan Muhammad Jarul Rozki Muhammad Zuhdi Munir, Rahmawati Nabila Dwi Septia Nahdatul Wesi Najma Aldina Roshin Nandang Mufti Nela Ranita Amanda Nur Azzahra Al Radiyah Nurhasmi Wahyuni Nurjannah Nurjannah Nurmutyah Naylah Nurwijayanti Rahadi Wirawan Rahmatun Inayah Ramadian Ridho Illahi Retna Apsari Saefullah, Lalu Sayida Magfirah Sembiring, Rinawati Shamim Mahabubul Haque Siti Azizah Sofiana Aprilia Suhayat Minardi Sunaryono Sunaryono Sunaryono, Sunaryono Susi Rahayu Syahrial A Syamsuddin Syamsuddin Syamsuddin Teguh Ardianto, Teguh Thathit Suprayogi Umratun Hasanah Wahyu Lina Ramadani Wahyudin Wahyudin Wida Puteri Agista Wulandari, Nurul Putri Yuliana, Futri Yunan Amza Muhammad Yunitun Tamara Ziyadatun Adawiyah Zyiadatun Adawiah