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All Journal Alotrop Jurnal Pendidikan dan Ilmu Kimia Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya
Bambang Ari Wahjoedi Bambang Ari Wahjoedi
University Teknologi PETRONAS, Banda Seri Iskandar, Tronash 32610 Perak Darul Ridzuan
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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SINTESIS NANOPARTIKEL ZnO MENGGUNAKAN EKSTRAK DAUN MANGGA (Mangifera sp.) DAN STUDI APLIKASINYA SEBAGAI FOTODEGRADASI CONGO RED Hasiah; Demi Dama Yanti; Bambang Ari Wahjoedi
ALOTROP Vol. 9 No. 1 (2025): Jurnal Pendidikan dan Ilmu Kimia
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/alo.v9i1.40396

Abstract

Zinc oxide (ZnO) is a widely studied semiconductor material due to its broad range of applications. ZnO is known for its stability and can be synthesized using various methods. One of the approaches employed in this study is the co-precipitation method with a green synthesis approach. The green synthesis principle applied in this research involves minimizing the use of synthetic chemicals by substituting them with natural materials. Mango leaves (Mangifera sp.), which are readily available in the environment, contain secondary metabolites which can act as the capping agents in synthesis ZnO nanoparticle. The role of the capping agent is to limit particle interactions, thereby reducing agglomeration. ZnO synthesis was carried out at a low temperature by mixing Zn²⁺ precursor, NaOH, and mangifera sp. leaf extract, followed by stirring. The heating process was conducted at 130°C for 4 hours. The synthesized material was characterized using X-ray diffraction (XRD), UV-DRS, and scanning electron microscopy (SEM). The characterization results confirmed that the ZnO sample exhibited a hexagonal wurtzite crystal structure, a nanoflower morphology, and a band gap energy of 3.26 eV. Keywords: ZnO; nanoparticles; photocatalyst; congo red; co-precipitation.
STEPPING COLORATION OF Co(OH)2/Ni(OH)2 ELECTROCHROMIC FILM PREPARED BY A SIMPLE CHEMICAL BATH DEPOSITION METHOD Ghifari, M Alvien; Desti Riandiani; Juwita Sari; Bambang Ari Wahjoedi
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): 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.v7i2.5707

Abstract

Electrochromic smart windows enable dynamic regulation of solar irradiation, thereby contributing to improved energy efficiency in building environments. In this work, Co(OH)₂/Ni(OH)₂ composite films were successfully deposited onto ITO-coated glass substrates via a facile chemical bath deposition method. Two configurations were explored: a homogeneously mixed composite and a double-layer architecture. The structural, morphological, and optical properties of the films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–Vis spectroscopy. Both film types exhibited voltage-dependent, stepwise color modulation under applied potentials, confirming their electrochromic behavior. Notably, the mixed Co(OH)2/Ni(OH)2 film demonstrated enhanced optical modulation, with a transmittance change (ΔT) of 11.10% and an optical density change (ΔOD) of 0.09 at 0.15 V, increasing to 50.14% and 0.91 at 0.75 V. In contrast, the bilayer configuration showed significantly lower ΔT and ΔOD values of 1.36% and 0.13 at 0.15 V, and 9.64% and 0.31 at 0.75 V. These results highlight the synergistic role of Co(OH)2 in tuning the optical response of Ni(OH)₂-based electrochromic films and suggest that compositional mixing is more effective than stratified layering for optimizing optical contrast in electrochromic devices.
Co-Authors Demi Dama Yanti Desti Riandiani Ghifari, M Alvien Hasiah juwita sari