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All Journal Bulletin of Electrical Engineering and Informatics Science and Technology Indonesia Bulletin of Chemical Reaction Engineering & Catalysis
Dang, Huu Phuc
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics

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Effect of the Dimethylformamide/Isopropanol Solvent Ratio on the Structure, Optical Properties, and Photodegradation Performance of RhB Using Bi-MOF Bui Bao Long, Pham; Nguyen, Van Cuong; Pham, Hoang Ai Le; Ta, Qui Thanh Hoai; Dang, Huu Phuc
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20345

Abstract

This study investigated the structural characteristics, surface morphology, and photocatalytic activity of bismuth-based metal-organic frameworks (BiBTC-ISOx) synthesized with varying ratios of N, N-dimethylformamide (DMF) and isopropanol (ISO). X-ray diffraction confirmed the crystalline structure of the BiBTC-ISOx (x = 1, 3, 6) compounds, while FTIR spectroscopy verified the successful bonding between the ligand and the Bi3+ complex. UV-Vis spectroscopy revealed strong UV light absorption with tunable bandgaps ranging from 3.28 to 3.68 eV. Nitrogen adsorption/desorption analysis revealed a hierarchical micro/mesoporous structure, with BiBTC-ISO6 exhibiting the highest surface area (24.968 m2/g). SEM imaging revealed a rectangular rod-like morphology, which became more elongated with increasing ISO content. The photocatalytic activity of BiBTC-ISOx was evaluated based on the degradation of Rhodamine B (RhB) under visible light, with BiBTC-ISO6 demonstrating the highest efficiency. Optimal conditions for RhB degradation were determined to be 0.03 g catalyst mass, 10 ppm RhB concentration, and pH of 3. Mechanistic studies revealed that superoxide radicals are the primary active species in the photocatalytic process. The BiBTC-ISO6 catalyst exhibited excellent stability and reusability over three consecutive degradation cycles, highlighting its potential for practical applications in organic dye removal. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Tunable Optical and Photoluminescence Properties of Metal X (Ni, Co, Mn, Ag)-Doped ZnSe Quantum Dots: Structural, Spectroscopic, and Colorimetric Analysis Bui, Thi Diem; Nguyen, Quang Liem; Nguyen, Van Cuong; Nguyen, Trong Tang; Dang, Huu Phuc
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 2 Year 2025 (August 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20372

Abstract

This study explores the impact of Ni, Co, Mn, and Ag doping on the optical and photoluminescence properties of ZnSe quantum dots (QDs). Structural analysis confirms successful dopant incorporation, with XRD revealing lattice strain-induced shifts. Optical studies show that Ni²⁺ and Co²⁺ induce blue shifts, while Mn²⁺ and Ag⁺ create redshifted emissions. Photoluminescence analysis demonstrates that Mn²⁺ doping enhances quantum efficiency to 49.52% via the 4T1 → 6A1 transition. Ag+-doped ZnSe exhibits blue-shifted emissions but suffers from defect-related non-radiative losses. CIE color coordinates validate tunable emissions, confirming potential applications in LEDs, displays, and bioimaging. These findings provide insights into dopant-induced band structure modifications, advancing the design of high-performance luminescent materials for optoelectronics. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Blue-yellow emissive LaAlO3:Dy3+ phosphor for high bright white light-emitting diodes Tung, Ha Thanh; Dang, Huu Phuc
Bulletin of Electrical Engineering and Informatics Vol 12, No 3: June 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v12i3.4949

Abstract

LaAlO3:Dy3+ (LAO:Dy3+) with blue-yellow emission for brilliant white light of light-emitting diodes (LEDs) was prepared using gel-combustion process. The chemical content of the created material was confirmed using energy dispersive X-ray analysis (EDX). The transmission electron microscopy was used to examine the phosphor crystal size and morphology. The luminescence analysis showed that LAO:Dy3+ phosphors exhibited peaks at 482 nm (blue) and 574 nm (yellow), attributed to the transitions 4F 9/2à6H 15/2 and 4F 9/2à6H 13/2, respectively. The investigating of correlated color temperature (CCT) and Commission International de L'Eclairage (CIE) described that the phosphor LAO:Dy3+ helped to attained good CCT coordination and bright cool-white emission under ultraviolet (UV) stimulation. However, when using in white LED fabrication, the concentration of LAO:Dy3+ should be modified to fulfill the need from manufactures. According to results from this work, the white light luminescence intensity and color rendering performance may be reduced if the LAO:Dy3+ is high (10%) because of too much scattering. On the other hand, such scattering improvements offered by LAO:Dy3+ phosphor is beneficial to reduce the color deviance for better color uniformity of light.
Electrochemically Deposited rGO Cu2S Composite as a High-Performance Counter Electrode for Quantum Dot-Sensitized Solar Cells Duyen, Nguyen Thuy Kieu; Hanh, Nguyen Thi My; Hieu, Le Van; Luu, Thi Viet Ha; Dang, Huu Phuc
Science and Technology Indonesia Vol. 11 No. 1 (2026): January
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.2026.11.1.1-9

Abstract

This study reports the development of reduced graphene oxide (rGO), copper sulfide (Cu2S), and their hybrid composite (rGO-Cu2S) as counter electrodes (CEs) for quantum dot-sensitized solar cells (QDSSCs). The electrodes were fabricated on FTO substrates via a simple, low-temperature electrochemical deposition method. Morphological analysis revealed flower-like Cu2S nanostructures and wrinkled rGO sheets, while the composite combined these features into a uniform hybrid layer. Electrochemical measurements demonstrated that the rGO-Cu2S CE exhibited superior catalytic activity and lower charge-transfer resistance compared to the individual materials. When integrated into QDSSCs, the rGO-Cu2S electrode achieved the highest power conversion efficiency (4.65%), outperforming Cu2S (3.77%) and rGO (3.24%). The synergistic interaction between conductive rGO networks and catalytically active Cu2S nanostructures underpin this improvement, highlighting rGO-Cu2S as a cost-effective and efficient alternative to noble-metal-based counter electrodes.
Co-Authors Bui Bao Long, Pham Bui, Thi Diem Duyen, Nguyen Thuy Kieu Hanh, Nguyen Thi My Hieu, Le Van Luu, Thi Viet Ha Nguyen, Quang Liem Nguyen, Trong Tang Nguyen, Van Cuong Pham, Hoang Ai Le Ta, Qui Thanh Hoai Tung, Ha Thanh