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All Journal VALENSI Jurnal Periodic Jurusan Kimia UNP Sainstek Indonesian Journal of Chemical Science Chimica et Natura Acta Pelita Eksakta Makara Journal of Science MASALIQ: Jurnal Pendidikan dan Sains
Sherly Kasuma Warda Ningsih
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padang State University, Kampus Air Tawar, Jl. Prof. Dr. Hamka, West Sumatera 25161
Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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PELATIHAN PENGGUNAAN LIVE WORSHEETS SEBAGAI LKPD INTERAKTIF DENGAN PENEKANAN PADA TIGA LEVEL REPRESENTASI KIMIA BAGI GURU KIMIA DI SMAN 1 LEMBAH GUMANTI DAN SMA DI KABUPATEN SOLOK BAGIAN SELATAN Nizar, Umar Kalmar; Azhar, Minda; Mukhaiyar, Riki; Zulhendra, Zulhendra; Suryelita, Suryelita; Ningsih, Sherly Kasuma Warda
Pelita Eksakta Vol 7 No 2 (2024): Pelita Eksakta, Vol. 7, No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol7-iss2/245

Abstract

SMA Negeri 1 Lembah Gumanti is one of the schools in Southern Solok Regency that’s actively spurring the development of its school by completing the infrastructure and quality of education for both students and teachers. ICT training especially for teachers to support the quality learning process. One of the uses of this facility is to create interactive LKPD on LiveWorksheets. The purpose of the service activity is to increase the knowledge and skills of chemistry teachers using various learning resources on websites on the internet, increase chemistry teachers' knowledge of the three levels of representation and their interconnections, increase chemistry teachers' knowledge and skills in combining learning resources for making interactive LKPD on the LiveWorksheets web with an emphasis on the three levels of chemical representation. The methods used in this activity are lecture, demonstration and practice. Training participants were asked to present the results of their activities.
Pengaruh Massa Sodium Dodecyl Sulfate terhadap Nilai Bandgap Semikonduktor TiO₂-ZnO Adha, Valen Febri; Ningsih, Sherly Kasuma Warda; Hardeli, Hardeli
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6696

Abstract

Modification of the TiO₂-ZnO semiconductor through the addition of Sodium Dodecyl Sulfate (SDS) has been carried out to reduce the bandgap energy using the sol-gel method. The SDS mass variations used in the synthesis process were 0.015, 0.020, 0.025, 0.030, and 0.035 grams. The synthesized samples were characterized using UV-Vis Diffuse Reflectance Spectroscopy (DRS) to determine the bandgap values. The characterization results showed that the addition of 0.025 grams of SDS produced the lowest bandgap value, measured at 3.16 eV. This reduction in bandgap is attributed to changes in the material's physical and chemical surface structure, influenced by the interaction between the surfactant and the TiO₂-ZnO surface, microstructural alterations, and modifications in crystallinity. However, at higher SDS concentrations (≥0.025 grams), the bandgap value increased again, due to particle agglomeration and hindered electron transfer. These findings indicate that the addition of SDS surfactant within an optimal range can enhance the optical properties of semiconductor materials, while excessive addition may degrade performance due to undesirable morphological changes.
Pengaruh Kecepatan Pengadukan ZnO sebagai Lapis Ganda pada Semikonduktor TiO₂-ZnO terhadap Nilai Efisiensi Dye Sensitized Solar Cell Saputra, Dihan Kurnia; Ningsih, Sherly Kasuma Warda; Hardeli, Hardeli
MASALIQ Vol 5 No 5 (2025): SEPTEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i5.6949

Abstract

This study aims to evaluate the efficiency of dye-sensitized solar cells (DSSC) by varying the stirring speed during the synthesis of ZnO as a double layer on the TiO₂-ZnO/SDS (Sodium Dodecyl Sulfate) semiconductor structure. The research is grounded in the importance of optimizing semiconductor structures to enhance solar energy conversion efficiency. The sol-gel method was used to synthesize ZnO at stirring speeds of 300, 600, 900, 1200, and 1500 rpm. DSSC fabrication was conducted using the doctor blade method with poly tannic acid as the dye. The operating principle of DSSC relies on photon absorption by the dye, where excited electrons are injected into the semiconductor. Efficiency measurements were carried out using a multimeter to obtain voltage and resistance values. The results showed that the highest efficiency of 0.174% was achieved at a stirring speed of 1200 rpm. This finding indicates that stirring speed during ZnO synthesis affects the morphology of the semiconductor, thereby influencing the photon-to-energy conversion efficiency of the DSSC. This study contributes to the development of more efficient DSSCs based on double-layer semiconductor structures through the control of synthesis parameters. Keywords: Semiconductor; ZnO; TiO₂-ZnO; SDS; DSSC
Preparation and Characterization of Pt/TiO2 Nanotube Arrays (TNAs) Cathode by Photoreduction Method for Hydrogen Evolution Ningsih, Sherly Kasuma Warda; Wibowo, Rahmat; Gunlazuardi, Jarnuzi
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 11, No. 2, November 2025
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v11i2.46475

Abstract

TiO2 nanotube arrays were fabricated using a two-step anodization method. TNAs have been modified by the photoreduction technique with Pt as the cathode in the photoelectrocatalytic zone for the reduction reaction of H+ to produce hydrogen. TNAs with Pt were modified using H2PtCl6 as the precursor by immersion of this solution on the TNA substrate. Pt/TNAs were characterized using SEM-EDX, UV-Vis DRS, XRD, Raman Spectroscopy, Photoluminescence (PL), and photoelectrochemical analysis. The results show that the morphology of TNAs in the tube forms 2.1mm in height, and Pt nanoparticles are formed on the mouth wall of the tube with a size of approximately 10nm. EDX analysis shows that the composition of Pt/TNAs is approximately 0.15%, Ti 37.09%, and O 62.76%, indicating that Pt has been decorated on the TNAs photoanode. The band gap of Pt/TNAs was 2.82 eV. The diffractogram shows three groups of diffraction peaks, indicating the presence of anatase TiO2, Ti as a substrate, and Pt, which has been modified in the TNAs. The Raman peaks of TNAs are confirmed to appear at Raman shifts of 144.75, 196.51, 395.94, 517.14, and 638.85 cm-1. PEC cathodes for hydrogen production using Pt-decorated TNAs have been successfully prepared using photoreduction.
Processing Used Cooking Oil into Economically Valuable Products as an Effort to Utilize Household Waste for the Istiqomah Majlis Taklim Women in Korong Olo Bangau Nagari Ketaping Batang Anai District Kurniawati, Desy; Dewata, Indang; Fadhilah, Fadhilah; Mulia, Melindra; Ningsih, Sherly Kasuma Warda; Veronita, Silvi; Marlini, Rahmida; Fatmawati, Rani
Pelita Eksakta Vol 8 No 2 (2025): Pelita Eksakta, Vol. 8, No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol8-iss2/315

Abstract

Nagari Ketaping in Batang Anai District has great potential for culinary tourism, especially through traditional fried snack vendors such as sala lauak. However, the extensive use of cooking oil in these activities leads to the generation of used cooking oil (jelantah), which poses serious health and environmental risks. Repeated use of the oil produces free radicals and carcinogenic substances that may cause degenerative diseases, while improper disposal into waterways leads to pollution and ecosystem damage. This community service program aims to educate and raise awareness among members of the majlis taklim in Nagari Ketaping about the dangers of used cooking oil and to demonstrate its potential for conversion into economically valuable products. The main participants are housewives who also operate small fried snack businesses. The outcomes include a scientific publication in Pelita Eksakta Journal (FMIPA UNP), a video documentation, and online media dissemination through Berita Minang.
Co-Authors Adha, Valen Febri Aini, Syamsi Budhi Oktavia Burma, Resna Desy Kurniawati Edi Nasra Erpina, Erpina Fadhilah Fadhilah Fatmawati, Rani Hardeli Hardeli Indang Dewata Jarnuzi Gunlazuardi Marlini, Rahmida Miftahul Khair Minda Azhar Mukhaiyar, Riki Mulia, Melindra Nizar, Umar Kalmar Pernadi, Niza Lian RAHMAT WIBOWO Rizki, Suci Yulia Saputra, Dihan Kurnia Sidiq, Aqil Marsya Suryelita, Suryelita Syauqi, Muhammad Iqbal Utami, Chichi Amne Veronita, Silvi Zulhendra, Zulhendra