1
|
Endeshaw S, Tufa LT, Goddati M, Lee J, Silalahi VC, Lee D, Murthy HCA, Sabir FK. Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model. ACS Omega 2024; 9:559-572. [PMID: 38222549 PMCID: PMC10785675 DOI: 10.1021/acsomega.3c06155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 11/19/2023] [Accepted: 11/27/2023] [Indexed: 01/16/2024]
Abstract
The photodegradation of organic pollutants using metal oxide-based catalysts has drawn great attention as an effective method for wastewater treatment. In this study, zinc oxide nanoparticles (ZnO NPs) and zinc oxide/copper oxide nanocomposites (ZnO/CuO NCs) were fabricated using the leaf extract of Croton macrostachyus as a nontoxic, natural reducing and stabilizing agent. The synthesized samples were characterized by employing X-ray diffraction, microscopic, spectroscopic, and electrochemical methods. The results confirmed the successful synthesis of ZnO NPs and ZnO/CuO NCs with well-defined crystalline structures and morphologies. The prepared samples were tested for the photodegradation of methylene blue (MB) dye under visible light irradiation. Compared to ZnO NPs, ZnO/CuO NCs showed greatly improved photocatalytic performances, particularly with the sample prepared with the 20 mol % Cu precursor (97.02%). The enhancement could be related to the formed p-n heterojunction, which can suppress the recombination of charge carriers and extend the photoresponsive range. A theoretical study of the photocatalytic activity of ZnO/CuO NCs against MB dye degradation was also conducted by using COMSOL Multiphysics software. The results of the simulation are in reasonable agreement with those of the experiment. This study contributes to the development of sustainable and effective photocatalytic materials that are suitable for application in environmental remediation, particularly in the treatment of wastewater.
Collapse
Affiliation(s)
- Solomon
Bekele Endeshaw
- Department
of Applied Chemistry, School of Natural Science, Adama Science and Technology University, P.O. Box:1888, Adama, Ethiopia
| | - Lemma Teshome Tufa
- Department
of Applied Chemistry, School of Natural Science, Adama Science and Technology University, P.O. Box:1888, Adama, Ethiopia
- Research
Institute of Materials Chemistry, Chungnam
National University, Daejeon 34134, Republic
of Korea
| | - Mahendra Goddati
- Department
of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Jaebeom Lee
- Department
of Chemistry, Chemistry Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | | | - Donghan Lee
- Department
of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | - H. C. Ananda Murthy
- Department
of Applied Chemistry, School of Natural Science, Adama Science and Technology University, P.O. Box:1888, Adama, Ethiopia
- Department
of Prosthodontics, Saveetha Dental College & Hospital, Saveetha
Institute of Medical and Technical Science (SIMATS), Saveetha University, Chennai 600077, Tamil Nadu, India
| | - Fedlu Kedir Sabir
- Department
of Applied Chemistry, School of Natural Science, Adama Science and Technology University, P.O. Box:1888, Adama, Ethiopia
| |
Collapse
|
2
|
Kim M, Ahn HJ, Silalahi VC, Heo D, Adhikari S, Jang Y, Lee J, Lee D. Dual-Dewetting Process for Self-Assembled Nanoparticle Clusters in Wafer Scale. Int J Mol Sci 2023; 24:13102. [PMID: 37685909 PMCID: PMC10488070 DOI: 10.3390/ijms241713102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 08/08/2023] [Accepted: 08/18/2023] [Indexed: 09/10/2023] Open
Abstract
Plasmonic molecules, which are geometrically well-defined plasmonic metal nanoparticle clusters, have attracted significant attention due to their enhancement of light-matter interactions owing to a stronger electric field enhancement than that by single particles. High-resolution lithography techniques provide precise positioning of plasmonic nanoparticles, but their fabrication costs are excessively high. In this study, we propose a lithography-free, self-assembly fabrication method, termed the dual-dewetting process, which allows the control of the size and density of gold nanoparticles. This process involves depositing a gold thin film on a substrate and inducing dewetting through thermal annealing, followed by a second deposition and annealing. The method achieves a uniform distribution of particle size and density, along with increased particle density, across a 6-inch wafer. The superiority of the method is confirmed by a 30-fold increase in the signal intensity of surface-enhanced Raman scattering following the additional dewetting with an 8 nm film, compared to single dewetting alone. Our findings indicate that the dual-dewetting method provides a simple and efficient approach to enable a variety of plasmonic applications through efficient plasmonic molecule large-area fabrication.
Collapse
Affiliation(s)
- Minjun Kim
- Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Hyun-Ju Ahn
- Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | | | - Damun Heo
- School of Semiconductor Display Technology, Hallym University, Chuncheon 24252, Republic of Korea
| | - Samir Adhikari
- Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Yudong Jang
- Institute of Quantum Systems (IQS), Chungnam National University, Daejeon 34134, Republic of Korea
| | - Jongmin Lee
- School of Semiconductor Display Technology, Hallym University, Chuncheon 24252, Republic of Korea
- Nano Convergence Technology Center, Hallym University, Chuncheon 24252, Republic of Korea
| | - Donghan Lee
- Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea
- Institute of Quantum Systems (IQS), Chungnam National University, Daejeon 34134, Republic of Korea
| |
Collapse
|
3
|
Chang YH, Silalahi VC, Yang YT, Wen YS, Kuo W. Full analysis on coupling strengths between split ring resonators for double negative microwave tight-binding models. Opt Express 2023; 31:24492-24504. [PMID: 37475275 DOI: 10.1364/oe.493283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 06/23/2023] [Indexed: 07/22/2023]
Abstract
Previous studies have shown that split-ring resonators (SRRs) can be utilized to achieve finely tuned nearest-neighbor coupling strengths in various one-dimensional hopping models. In our study, we present a systematic investigation of resonator coupling, providing a comprehensive quantitative description of the interaction between SRRs and complementary split-ring resonators (CSRRs) for any orientation combination. Our method includes an estimation of the coupling strength through a linear combination of periodic functions based on two orientation angles, with a sinusoidal expansion of up to the 3rd order, allowing for efficient and streamlined microwave structure design. Through our approach, we offer a satisfactory explanation of the band structure of SRR chains using a microwave-hopping model, which facilitates the exploration of exotic photonic band structures based on tight-binding theory.
Collapse
|