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All Journal Jurnal Periodic Jurusan Kimia UNP Sainstek Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Acta Chimica Asiana Indonesian Journal of Chemical Science and Technology MASALIQ: Jurnal Pendidikan dan Sains
Sherly Kasuma Warda Ningsih
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Religion Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology Social Sciences

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PEMBUATAN LAPISAN TIPIS MANGAN OKSIDA DAN LITIUM-MANGAN OKSIDA PADA SUBSTRAT KACA DENGAN METODA DIP-COATING MELALUI PROSES SOL-GEL Warda Ningsih, Sherly Kasuma
Sainstek Vol5, No 1, 2010
Publisher : Jurnal Sainstek

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (46.965 KB)

Abstract

Preparation of manganese oxide and lithium-manganese oxide thin layer on glass substrate by dip-coating method via sol-gel process have been investigated. Manganese (II) nitrate tetrahidrate and lithium chloride were used as precursors, isopropanol as solvent and DEA as additive. Dip-coating process have been done on glass substrate at 6 times with dipping time around 2 minutes for each layer process and dried at 110-120 oC around 15 minutes. Dried samples heated at 400 oC, 500oC and 600oC during 120 minutes. Black thin layer were obtained as products. The products were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The XRD pattern was shown manganese oxide thin layer were obtained Mn2O3 only. Crystal structure of Mn2O3 was orthorombic with crystallite size around 13.0 nm (JCPDS No. 24-0508). SEM image (at 500oC) showed uniform and smooth surfaces with grain size around 0,01 m. The XRD patterns showed that lithium-manganese oxide thin layer were obtained LiMn2O4 and small amount of Mn2O3. Crystal structure of LiMn2O4 was spinnel with crystallite size around 16.86 nm (JCPDS No. 35-0782). SEM images (at 400 and 500oC) showed fiber form were produced generally and spheric form at 600oC. Key words : lithium-manganese oxide, dip-coating, sol-gel, fiber, spheric,
Deteksi Formaldehida Menggunakan Glassy Carbon Electrode (GCE) Modifikasi Lapisan Tipis Emas secara Voltametri Siklik Maharani, Indah Kemala; Sari, Trisna Kumala; Dewata, Indang; Warda Ningsih, Sherly Kasuma; Yamesa Away, Romy Dwipa
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124526

Abstract

The formaldehyde was found as one of the toxic and mutagenic products. Long-term exposure will harm the health of the human body. This study aims to detect formaldehyde developed on an electrochemical sensor using Glassy Carbon Electrode (GCE) modified with a thin layer of gold as the working electrode by cyclic voltammetry. Electrode modification was carried out by electrodeposition of Au potential-sweeping on electrodes known as Au/GCE electrodes. The resulting electrode has high conductivity and excellent catalytic activity because it is able to provide a large peak current response. In this study, the optimum conditions will be determined based on variations in the electrodeposition cycles of gold thin films and variations in the supporting electrolyte. The optimum cycle of gold thin film electrodeposition was obtained, namely one cycle and 0.1 M KOH as the optimum supporting electrolyte. The peak current obtained is sharper, the sensitivity and stability are also better due to the electrocatalytic properties produced by the high gold thin layer.
Effect Type of Desorption Eluent and Concentration in Desorption of Zn2+ Cation from Sulfonate Modified Silica Gel-GPTMS (Glycydoxypropyltrimethoxysilane) Adsorbent Hafis, Muhamad; Oktavia, Budhi; Alizar, Alizar; Warda Ningsih, Sherly Kasuma
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62256

Abstract

Silica has silanol groups contained in it which have low binding ability because it has low acidity, resulting in low absorption effectiveness on silica. In order to improve the properties and to expand the field of utilization, a modification process is carried out on silica gel using GPTMS bridging compounds and sulfonate salts as modifiers. The study explains that CaCl2.2H2O with a desorption percent of 97.25% has a greater ability than NaCl which is only 83.93% in the desorption of Zn2+ cations. The study also explains that the optimum concentration of CaCl2.2H2O eluent in the desorption of Zn2+ cations is at 1mmol/L where the desorption yield is 93.74%.
Effect Type of Desorption Eluent and Concentration in Desorption of Zn2+ Cation from Sulfonate Modified Silica Gel-GPTMS (Glycydoxypropyltrimethoxysilane) Adsorbent Hafis, Muhamad; Oktavia, Budhi; Alizar, Alizar; Warda Ningsih, Sherly Kasuma
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62256

Abstract

Silica has silanol groups contained in it which have low binding ability because it has low acidity, resulting in low absorption effectiveness on silica. In order to improve the properties and to expand the field of utilization, a modification process is carried out on silica gel using GPTMS bridging compounds and sulfonate salts as modifiers. The study explains that CaCl2.2H2O with a desorption percent of 97.25% has a greater ability than NaCl which is only 83.93% in the desorption of Zn2+ cations. The study also explains that the optimum concentration of CaCl2.2H2O eluent in the desorption of Zn2+ cations is at 1mmol/L where the desorption yield is 93.74%.
PENGARUH VARIASI POTENSIAL ANODISASI TERHADAP SIFAT OPTIK TIO2 NANOTUBE ARRAYS (TNAS) MENGGUNAKAN METODE ANODISASI DUA TAHAP Zahara; Sherly Kasuma Warda Ningsih
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 8 No. 1 (2026): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v8i1.7322

Abstract

Advances in science and technology have increased interest in semiconductor materials at the nanoscale, especially titanium dioxide (TiO2) with its characteristic optical properties such as band gap energy and light absorption. The growth of nanotube structures using an anodization method with parameters, namely pH, temperature, electrolyte composition, anodization potential, and time. The anodization potential has a significant influence on nanotube growth, including thickness and pore diameter. However, the higher the potential, the risk of charge recombination can occur. TNAs were prepared using a two-stage anodization method using potential variations of 40 V, 45 V, and 50 V for 1 hour in the first stage and 30 minutes in the second stage. UV-Vis DRS characterization showed that the potential of 40 V (3.22 eV), potential of 45 V (3.32 eV), and potential of 50 V (3.37 eV). The optimum potential is 40 V responsive to UV light.
Development of a Cr(VI) metal ion detection sensor using a modified pencil lead electrode (PLE) with a silver thin layer using the voltammetry method Nella Aulia Putri; Trisna Kumala Sari; Budhi Oktavia; Sherly Kasuma Warda Ningsih
Acta Chimica Asiana Vol. 9 No. 1 (2026)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v9i1.251

Abstract

Chromium(VI) metal ions have harmful effects on the environment and organisms. Chromium(VI) particles can cause chromosomal abnormalities, cross-linking, disruption of the cell cycle, and DNA damage within cells. Therefore, due to its high toxicity, it is crucial to monitor the concentration of chromium(VI) metal ions in the environment. This study aims to detect Cr(VI) metal ions in a simple, rapid, and effective manner. Electrochemical methods are employed to investigate the performance of PLE and Ag/PLE electrodes and to determine the optimal conditions for electrodeposition cycles and supporting electrolyte concentrations in detecting Cr(VI) metal ions. The electrochemical method is based on the specific reaction of the analyte, which generates an electrical signal. The PLE surface is modified with a silver thin layer through electrodeposition using cyclic voltammetry. The silver thin layer used for electrode modification offers several advantages, including improved electron transport and enhanced electrocatalytic response. The results indicate that the performance of Ag/PLE is superior to that of PLE in detecting Cr(VI) metal ions under optimal supporting electrolyte conditions, specifically 0.1 M HNO₃ with one electrodeposition cycle. Calibration curve analysis for Cr(VI) ions yielded the regression equation y = 0.6688x + 0.0085, with a correlation coefficient (R²) of 0.9958 and a limit of detection (LOD) of 0.18 mM.
Pengaruh Massa Sodium Dodecyl Sulfate terhadap Nilai Bandgap Semikonduktor TiO₂-ZnO Valen Febri Adha; Sherly Kasuma Warda Ningsih; 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 Dihan Kurnia Saputra; Sherly Kasuma Warda Ningsih; 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
Preparasi TiO2 Nanotube Arrays (TNAs) Menggunakan Metode Anodisasi Dua Tahap Zahara Ramadani; Sherly Kasuma Warda Ningsih
MASALIQ Vol 6 No 2 (2026): MARET
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.9066

Abstract

Titanium dioxide (TiO₂) is a semiconductor material widely used in various ultraviolet-responsive applications; however, the controlled growth of well-ordered and homogeneous TiO₂ nanotube arrays (TNAs) via two-step anodization still requires further investigation. This study aimed to analyze TNA growth, current density behavior, and optical characteristics using a two-step anodization method. The experimental approach was conducted on Ti foil substrates at a constant potential of 50 V for 60 minutes in the first step and 30 minutes in the second step. Current density was recorded throughout the anodization process, while the optical properties of the TNAs were analyzed using UV-Vis Diffuse Reflectance Spectroscopy (DRS) with Tauc plot analysis. The results revealed three main current density phases in the first step, namely an initial decrease from 14 mA/cm² to 10 mA/cm² within 30 seconds, an increase to 11.5 mA/cm² at 120 seconds, and a relatively constant condition thereafter, whereas the second step exhibited a faster and more stable current decrease. The band gap energy of the TNAs was determined to be 3.37 eV, with dominant absorption in the ultraviolet region at around 367.95 nm. These findings confirm the effectiveness of two-step anodization in producing stable and well-ordered TNAs, which can potentially be optimized for various photon-based applications that exploit ultraviolet response.
Co-Authors Alizar, Alizar Budhi Oktavia Dihan Kurnia Saputra Hafis, Muhamad Hardeli Hardeli Indang Dewata Maharani, Indah Kemala Nella Aulia Putri Romy Dwipa Yamesa Away Sari, Trisna Kumala Trisna Kumala Sari Valen Febri Adha Zahara Zahara Ramadani