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Nwaji N, Gwak J, Nguyen MC, Nguyen HQ, Kang H, Choi Y, Kim Y, Chen H, Lee J. Emerging potentials of Fe-based nanomaterials for chiral sensing and imaging. Med Res Rev 2024; 44:897-918. [PMID: 38084636 DOI: 10.1002/med.22003] [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: 07/07/2022] [Revised: 04/11/2023] [Accepted: 11/26/2023] [Indexed: 04/06/2024]
Abstract
Fe-based nanostructures have possessed promising properties that make it suitable for chiral sensing and imaging applications owing to their ultra-small size, non-toxicity, biocompatibility, excellent photostability, tunable fluorescence, and water solubility. This review summarizes the recent research progress in the field of Fe-based nanostructures and places special emphases on their applications in chiral sensing and imaging. The synthetic strategies to prepare the targeted Fe-based structures were also introduced. The chiral sensing and imaging applications of the nanostructures are discussed in details.
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Affiliation(s)
- Njemuwa Nwaji
- Institute of Materials Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - Juyong Gwak
- Department of Chemistry, Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - My-Chi Nguyen
- Institute of Materials Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - Huu-Quang Nguyen
- Institute of Materials Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - Hyojin Kang
- Department of Chemistry, Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - Youngeun Choi
- Department of Chemistry, Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - Youngmi Kim
- Department of Chemistry, Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, Republic of Korea
| | - Hongxia Chen
- Center for Molecular Recognition and Biosensing, School of Life Sciences, Shanghai University, Shanghai, PR China
| | - Jaebeom Lee
- Institute of Materials Chemistry, Chungnam National University, Daejeon, Republic of Korea
- Department of Chemistry, Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, Republic of Korea
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2
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Gicha BB, Tufa LT, Nwaji N, Hu X, Lee J. Advances in All-Solid-State Lithium-Sulfur Batteries for Commercialization. Nanomicro Lett 2024; 16:172. [PMID: 38619762 PMCID: PMC11018734 DOI: 10.1007/s40820-024-01385-6] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 02/24/2024] [Indexed: 04/16/2024]
Abstract
Solid-state batteries are commonly acknowledged as the forthcoming evolution in energy storage technologies. Recent development progress for these rechargeable batteries has notably accelerated their trajectory toward achieving commercial feasibility. In particular, all-solid-state lithium-sulfur batteries (ASSLSBs) that rely on lithium-sulfur reversible redox processes exhibit immense potential as an energy storage system, surpassing conventional lithium-ion batteries. This can be attributed predominantly to their exceptional energy density, extended operational lifespan, and heightened safety attributes. Despite these advantages, the adoption of ASSLSBs in the commercial sector has been sluggish. To expedite research and development in this particular area, this article provides a thorough review of the current state of ASSLSBs. We delve into an in-depth analysis of the rationale behind transitioning to ASSLSBs, explore the fundamental scientific principles involved, and provide a comprehensive evaluation of the main challenges faced by ASSLSBs. We suggest that future research in this field should prioritize plummeting the presence of inactive substances, adopting electrodes with optimum performance, minimizing interfacial resistance, and designing a scalable fabrication approach to facilitate the commercialization of ASSLSBs.
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Affiliation(s)
- Birhanu Bayissa Gicha
- Research Institute of Materials Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Lemma Teshome Tufa
- Research Institute of Materials Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Njemuwa Nwaji
- Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106, Warsaw, Poland
| | - Xiaojun Hu
- School of Life Sciences, Shanghai University, 200444, Shanghai, People's Republic of China
| | - Jaebeom Lee
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea.
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Yonas S, Gicha BB, Adhikari S, Sabir FK, Tran VT, Nwaji N, Gonfa BA, Tufa LT. Electric-Field-Assisted Synthesis of Cu/MoS 2 Nanostructures for Efficient Hydrogen Evolution Reaction. Micromachines (Basel) 2024; 15:495. [PMID: 38675306 PMCID: PMC11052344 DOI: 10.3390/mi15040495] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Revised: 03/23/2024] [Accepted: 03/28/2024] [Indexed: 04/28/2024]
Abstract
Molybdenum sulfide-oxide (MoS2, MS) emerges as the prime electrocatalyst candidate demonstrating hydrogen evolution reaction (HER) activity comparable to platinum (Pt). This study presents a facile electrochemical approach for fabricating a hybrid copper (Cu)/MoS2 (CMS) nanostructure thin-film electrocatalyst directly onto nickel foam (NF) without a binder or template. The synthesized CMS nanostructures were characterized utilizing energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical methods. The XRD result revealed that the Cu metal coating on MS results in the creation of an extremely crystalline CMS nanostructure with a well-defined interface. The hybrid nanostructures demonstrated higher hydrogen production, attributed to the synergistic interplay of morphology and electron distribution at the interface. The nanostructures displayed a significantly low overpotential of -149 mV at 10 mA cm-2 and a Tafel slope of 117 mV dec-1, indicating enhanced catalytic activity compared to pristine MoS2.This research underscores the significant enhancement of the HER performance and conductivity achieved by CMS, showcasing its potential applications in renewable energy.
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Affiliation(s)
- Surra Yonas
- Department of Applied Chemistry, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia (F.K.S.)
| | - Birhanu Bayissa Gicha
- Research Institute of Materials Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea;
| | - Samir Adhikari
- Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea;
| | - Fedlu Kedir Sabir
- Department of Applied Chemistry, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia (F.K.S.)
| | - Van Tan Tran
- Faculty of Biotechnology, Chemistry and Environmental Engineering, Phenikaa University, Hanoi 10000, Vietnam;
| | - Njemuwa Nwaji
- Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland;
| | - Bedasa Abdisa Gonfa
- Department of Applied Chemistry, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia (F.K.S.)
| | - Lemma Teshome Tufa
- Department of Applied Chemistry, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia (F.K.S.)
- Research Institute of Materials Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea;
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Goddati M, Nguyen HQ, Kang S, Gicha BB, Tufa LT, Nwaji N, Nguyen MCT, Gwak J, Lee J. Rugged Forest Morphology of Magnetoplasmonic Nanorods that Collect Maximum Light for Photoelectrochemical Water Splitting. Small 2023; 19:e2302980. [PMID: 37376838 DOI: 10.1002/smll.202302980] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/22/2023] [Indexed: 06/29/2023]
Abstract
A feasible nanoscale framework of heterogeneous plasmonic materials and proper surface engineering can enhance photoelectrochemical (PEC) water-splitting performance owing to increased light absorbance, efficient bulk carrier transport, and interfacial charge transfer. This article introduces a new magnetoplasmonic (MagPlas) Ni-doped Au@Fex Oy nanorods (NRs) based material as a novel photoanode for PEC water-splitting. A two stage procedure produces core-shell Ni/Au@Fex Oy MagPlas NRs. The first-step is a one-pot solvothermal synthesis of Au@Fex Oy . The hollow Fex Oy nanotubes (NTs) are a hybrid of Fe2 O3 and Fe3 O4 , and the second-step is a sequential hydrothermal treatment for Ni doping. Then, a transverse magnetic field-induced assembly is adopted to decorate Ni/Au@Fex Oy on FTO glass to be an artificially roughened morphologic surface called a rugged forest, allowing more light absorption and active electrochemical sites. Then, to characterize its optical and surface properties, COMSOL Multiphysics simulations are carried out. The core-shell Ni/Au@Fex Oy MagPlas NRs increase photoanode interface charge transfer to 2.73 mAcm-2 at 1.23 V RHE. This improvement is made possible by the rugged morphology of the NRs, which provide more active sites and oxygen vacancies as the hole transfer medium. The recent finding may provide light on plasmonic photocatalytic hybrids and surface morphology for effective PEC photoanodes.
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Affiliation(s)
- Mahendra Goddati
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Huu-Quang Nguyen
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Sohyun Kang
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Birhanu Bayissa Gicha
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
- Environmental Science Program, Haramaya University, Dire Dawa, P.O. Box 138, Ethiopia
| | - Lemma Teshome Tufa
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
- Institute of Materials Chemistry, Chungnam National University, Daejeon, 34134, South Korea
- Department of Chemistry, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia
| | - Njemuwa Nwaji
- Institute of Materials Chemistry, Chungnam National University, Daejeon, 34134, South Korea
| | - My-Chi Thi Nguyen
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Juyong Gwak
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Jaebeom Lee
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
- Department of Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
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Nwaji N, Gwak J, Goddati M, Kang H, Hammed Pasanaje A, Sharan A, Singh N, Lee J. Defect-Engineered Fe 3C@NiCo 2S 4 Nanospike Derived from Metal-Organic Frameworks as an Advanced Electrode Material for Hybrid Supercapacitors. ACS Appl Mater Interfaces 2023. [PMID: 37431988 DOI: 10.1021/acsami.3c04635] [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] [Subscribe] [Scholar Register] [Indexed: 07/12/2023]
Abstract
The rational synthesis and tailoring of metal-organic frameworks (MOFs) with multifunctional micro/nanoarchitectures have emerged as a subject of significant academic interest owing to their promising potential for utilization in advanced energy storage devices. Herein, we explored a category of three-dimensional (3D) NiCo2S4 nanospikes that have been integrated into a 1D Fe3C microarchitecture using a chemical surface transformation process. The resulting electrode materials, i.e., Fe3C@NiCo2S4 nanospikes, exhibit immense potential for utilization in high-performance hybrid supercapacitors. The nanospikes exhibit an elevated specific capacity (1894.2 F g-1 at 1 A g-1), enhanced rate capability (59%), and exceptional cycling stability (92.5% with 98.7% Coulombic efficiency) via a charge storage mechanism reminiscent of a battery. The augmented charge storage characteristics are attributed to the collaborative features of the active constituents, amplified availability of active sites inherent in the nanospikes, and the proficient redox chemical reactions of multi-metallic guest species. When using nitrogen-doped carbon nanofibers as the anode to fabricate hybrid supercapacitors, the device exhibits high energy and power densities of 62.98 Wh kg-1 and 6834 W kg-1, respectively, and shows excellent long-term cycling stability (95.4% after 5000 cycles), which affirms the significant potential of the proposed design for applications in hybrid supercapacitors. The DFT study showed the strong coupling of the oxygen from the electrolyte OH- with the metal atom of the nanostructures, resulting in high adsorption properties that facilitate the redox reaction kinetics.
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Affiliation(s)
- Njemuwa Nwaji
- Institute of Materials Chemistry, Chungnam National University, Daejeon 34134, South Korea
| | - Juyong Gwak
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, South Korea
| | - Mahendra Goddati
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, South Korea
| | - Hyojin Kang
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, South Korea
| | - Adewale Hammed Pasanaje
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Abhishek Sharan
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Nirpendra Singh
- Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Center for Catalysis and Separations (CeCaS), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Jaebeom Lee
- Institute of Materials Chemistry, Chungnam National University, Daejeon 34134, South Korea
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, South Korea
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Achadu OJ, Nwaji N, Lee D, Lee J, Akinoglu EM, Giersig M, Park EY. 3D hierarchically porous magnetic molybdenum trioxide@gold nanospheres as a nanogap-enhanced Raman scattering biosensor for SARS-CoV-2. Nanoscale Adv 2022; 4:871-883. [PMID: 36131829 PMCID: PMC9419194 DOI: 10.1039/d1na00746g] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 01/04/2022] [Indexed: 05/03/2023]
Abstract
The global pandemic of COVID-19 is an example of how quickly a disease-causing virus can take root and threaten our civilization. Nowadays, ultrasensitive and rapid detection of contagious pathogens is in high demand. Here, we present a novel hierarchically porous 3-dimensional magnetic molybdenum trioxide-polydopamine-gold functionalized nanosphere (3D mag-MoO3-PDA@Au NS) composed of plasmonic, semiconductor, and magnetic nanoparticles as a multifunctional nanosculptured hybrid. Based on the synthesized 3D mag-MoO3-PDA@Au NS, a universal "plug and play" biosensor for pathogens is proposed. Specifically, a magnetically-induced nanogap-enhanced Raman scattering (MINERS) detection platform was developed using the 3D nanostructure. Through a magnetic actuation process, the MINERS system overcomes Raman signal stability and reproducibility challenges for the ultrasensitive detection of SARS-CoV-2 spike protein over a wide dynamic range up to a detection limit of 10-15 g mL-1. The proposed MINERS platform will facilitate the broader use of Raman spectroscopy as a powerful analytical detection tool in diverse fields.
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Affiliation(s)
- Ojodomo J Achadu
- Research Institute of Green Science and Technology, Shizuoka University 836 Ohya, Suruga-ku Shizuoka 422-8529 Japan +81-54-238-4887 +81-54-238-3306
- International Institute for Nanocomposites Manufacturing, WMG, University of Warwick CV4 7AL Coventry UK
| | - Njemuwa Nwaji
- International Academy of Optoelectronics at Zhaoqing, South China Normal University Liyuan Street 526238 Guangdong China
| | - Dongkyu Lee
- Dept. of Chemistry, College of Natural Science, Chungnam National University 99 Daehak-ro, Yuseong-gu Daejeon 34134 Korea
| | - Jaebeom Lee
- Dept. of Chemistry, College of Natural Science, Chungnam National University 99 Daehak-ro, Yuseong-gu Daejeon 34134 Korea
| | - Eser M Akinoglu
- International Academy of Optoelectronics at Zhaoqing, South China Normal University Liyuan Street 526238 Guangdong China
| | - Michael Giersig
- International Academy of Optoelectronics at Zhaoqing, South China Normal University Liyuan Street 526238 Guangdong China
- Institute of Fundamental Technological Research, Polish Academy of Sciences 02-106 Warsaw Poland
| | - Enoch Y Park
- Research Institute of Green Science and Technology, Shizuoka University 836 Ohya, Suruga-ku Shizuoka 422-8529 Japan +81-54-238-4887 +81-54-238-3306
- Laboratory of Biotechnology, Department of Bioscience, Graduate School of Science and Technology, Shizuoka University 836 Ohya, Suruga-ku Shizuoka 422-8529 Japan
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Matshitse R, Nwaji N, Managa M, Chen ZL, Nyokong T. Photodynamic therapy characteristics of phthalocyanines in the presence of boron doped detonation nanodiamonds: Effect of symmetry and charge. Photodiagnosis Photodyn Ther 2021; 37:102705. [PMID: 34954389 DOI: 10.1016/j.pdpdt.2021.102705] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 12/18/2021] [Accepted: 12/20/2021] [Indexed: 11/30/2022]
Abstract
The synthesis, photophysicochemical and photodynamic therapy (PDT) activity of benzothiazole substituted zinc phthalocyanine: 1 (asymmetrically substituted and composed of no charges), 2 (asymmetrically substituted and composed of three positive charges), and 3 (symmetrically substituted and composed of four positive charges), are presented. The triplet and singlet oxygen quantum yields were highest for complex 2 showing the importance of asymmetry and charge. The complexes are covalently and non-covalently linked to B doped detonation nanodiamonds (B@DNDs) to yield nanohybrids (B@DNDs-1, B@DNDs-2, B@DNDs-3). The presence of B@DNDs, asymmetry and positive charge resulted in improved PDT with the lowest cell viability being observed for B@DNDs-2 at 5%. The cell viability ranged from 5 to 7% for the nanohybrids compared to 19 to 26% for Pcs alone.
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Affiliation(s)
- Refilwe Matshitse
- Institute for Nanotechnology Innovation, Rhodes University, Makhanda, 6140, South Africa
| | - Njemuwa Nwaji
- Institute for Nanotechnology Innovation, Rhodes University, Makhanda, 6140, South Africa
| | - Muthumuni Managa
- Institute for Nanotechnology Innovation, Rhodes University, Makhanda, 6140, South Africa
| | - Zhi-Long Chen
- Department of Pharmaceutical Science & Technology, College of Chemistry and Biology, Donghua University, Shanghai, 201620, China
| | - Tebello Nyokong
- Institute for Nanotechnology Innovation, Rhodes University, Makhanda, 6140, South Africa.
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Nwaji N, Akinoglu EM, Lin B, Wang X, Giersig M. One-Pot Synthesis of One-Dimensional Multijunction Semiconductor Nanochains from Cu 1.94S, CdS, and ZnS for Photocatalytic Hydrogen Generation. ACS Appl Mater Interfaces 2021; 13:58630-58639. [PMID: 34866382 DOI: 10.1021/acsami.1c18020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Chains of alternating semiconductor nanocrystals are complex nanostructures that can offer control over photogenerated charge carriers dynamics and quantized electronic states. We develop a simple one-pot colloidal synthesis of complex Cu1.94S-CdS and Cu1.94S-ZnS nanochains exploiting an equilibrium driving ion exchange mechanism. The chain length of the heterostructures can be tuned using a concentration dependent cation exchange mechanism controlled by the precursor concentrations, which enables the synthesis of monodisperse and uniform Cu1.94S-CdS-Cu1.94S nanochains featuring three epitaxial junctions. These seamless junctions enable efficient separation of photogenerated charge carriers, which can be harvested for photocatalytic applications. We demonstrate the superior photocatalytic activity of these noble metal free materials through solar hydrogen generation at a hydrogen evolution rate of 22.01 mmol g-1 h-1, which is 1.5-fold that of Pt/CdS heterostructure photocatalyst particles.
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Affiliation(s)
- Njemuwa Nwaji
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, 526238 Guangdong, China
| | - Eser Metin Akinoglu
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, 526238 Guangdong, China
- ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Biyun Lin
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, 526238 Guangdong, China
- National Center for International Research on Green Optoelectronics, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Xin Wang
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, 526238 Guangdong, China
- National Center for International Research on Green Optoelectronics, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Michael Giersig
- International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, 526238 Guangdong, China
- Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland
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Nnaji N, Nwaji N, Fomo G, Mack J, Nyokong T. Inhibition of Aluminium Corrosion Using Benzothiazole and Its Phthalocyanine Derivative. Electrocatalysis (N Y) 2019. [DOI: 10.1007/s12678-019-00538-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Soy RC, Babu B, Oluwole DO, Nwaji N, Oyim J, Amuhaya E, Prinsloo E, Mack J, Nyokong T. Photophysicochemical properties and photodynamic therapy activity of chloroindium(III) tetraarylporphyrins and their gold nanoparticle conjugates. J PORPHYR PHTHALOCYA 2019. [DOI: 10.1142/s1088424618501146] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Novel chloroindium(III) complexes of tetra(4-methylthiophenyl)porphyrin (2a) and tetra-2-thienylporphyrin (2b) dyes have been synthesized and characterized. The main goal of the project was to identify fully symmetric porphyrin dyes with Q-band regions that lie partially in the therapeutic window that are suitable for use in photodynamic therapy (PDT). 2a and 2b were found to have fluorescence quantum yield values [Formula: see text] 0.01 and moderately high singlet oxygen quantum yields (0.54−0.73) due to heavy atom effects associated with the sulfur and indium atoms. The dark toxicity and PDT activity against epithelial breast cancer cells (MCF-7) were investigated over a dose range of 3.0−40 [Formula: see text]g [Formula: see text] mL[Formula: see text]. The in vitro dark cytotoxicity of 2a is significantly lower than that of 2b at [Formula: see text] 40 [Formula: see text]g [Formula: see text] mL[Formula: see text]. 2a was conjugated with gold nanoparticles (AuNPs) to form a nanoconjugate (2a-AuNPs), which exhibited a higher singlet oxygen quantum yield ([Formula: see text] value and PDT activity than was observed for 2a alone. The results suggest that the AuNPs nanoconjugates of readily synthesized fully symmetric porphyrin dyes are potentially suitable for PDT applications, if meso-aryl substituents that provide scope for nanoparticle conjugation can be introduced that shift the Q bands into the therapeutic window.
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Affiliation(s)
- Rodah C. Soy
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
| | - Balaji Babu
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
| | - David O. Oluwole
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
| | - Njemuwa Nwaji
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
| | - James Oyim
- School of Pharmacy and Healthy Sciences, USIU-Africa, Nairobi, Kenya
| | - Edith Amuhaya
- School of Pharmacy and Healthy Sciences, USIU-Africa, Nairobi, Kenya
| | - Earl Prinsloo
- Biotechnology Innovation Centre, Rhodes University, Makhanda 6140, South Africa
| | - John Mack
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
| | - Tebello Nyokong
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Makhanda 6140, South Africa
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Nnaji N, Nwaji N, Mack J, Nyokong T. Corrosion Resistance of Aluminum against Acid Activation: Impact of Benzothiazole-Substituted Gallium Phthalocyanine. Molecules 2019; 24:molecules24010207. [PMID: 30626054 PMCID: PMC6337598 DOI: 10.3390/molecules24010207] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/03/2019] [Accepted: 01/04/2019] [Indexed: 11/27/2022] Open
Abstract
This study describes the adsorption behavior of organic inhibitors at the aluminum-HCl solution interface and their corrosion inhibition performance. The organic inhibitors employed are: 4-(benzo [d]thiazol-2ylthio)phthalonitrile (BTThio) and tetrakis[(benzo[d]thiazol-2-yl-thio)phthalo- cyaninato]gallium(III) chloride (ClGaBTThioPc). The corrosion behavior of these inhibitors is investigated using electrochemical and computational techniques. Open circuit potential results reveal predominant cathodic character for the mechanism of aluminum corrosion inhibition by the inhibitors. Inhibition efficiency values from potentiodynamic polarization measurements increase from 46.9 to 70.8% for BTThio and 59.7 to 81.0% for ClGaBTThioPc within the concentration range of 2 to 10 μM. Scanning electron microscopy (SEM) measurements reveal protection of the metal surface from acid attack, in the presence of the inhibitors and energy dispersive X-ray (EDX) measurements show that the most probable way by which the inhibitors protect the metal surface would be by shielding it from the corrosion attacks of Cl− from the acid. Quantum chemical parameters corroborate well with experimental findings.
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Affiliation(s)
- Nnaemeka Nnaji
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
| | - Njemuwa Nwaji
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
| | - John Mack
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
| | - Tebello Nyokong
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
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Matshitse R, Nwaji N, Mananga M, Prinsloo E, Nyokong T. Effect of number of positive charges on the photophysical and photodynamic therapy activities of quarternary benzothiazole substituted zinc phthalocyanine. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.08.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Nwaji N, Dingiswayo S, Mack J, Nyokong T. Photophysical and enhanced nonlinear optical response in asymmetric benzothiazole substituted phthalocyanine covalently linked to semiconductor quantum dots. Spectrochim Acta A Mol Biomol Spectrosc 2018; 204:629-639. [PMID: 29980065 DOI: 10.1016/j.saa.2018.06.098] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Revised: 06/25/2018] [Accepted: 06/26/2018] [Indexed: 06/08/2023]
Abstract
The synthesis of asymmetric benzothiazole substituted phthalocyanines (complexes 3 to 5) and their covalent attachment to glutathione (GSH) functionalized quantum dots (QDs) are reported in this work. Additionally, their photophysical and nonlinear optical properties were investigated. A decrease in the fluorescence quantum yield with corresponding increase in the triplet quantum yield was observed when the complexes were covalently linked to glutathione (GSH) functionalized cadmium telluride (CdTe) quantum dots. Reverse saturable absorption was found to be predominantly dominated by excited state absorption. The observed limiting threshold values range from 0.29-0.75 J/cm2.
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Affiliation(s)
- Njemuwa Nwaji
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Somila Dingiswayo
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - John Mack
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Tebello Nyokong
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
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14
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Dube E, Oluwole DO, Nwaji N, Nyokong T. Glycosylated zinc phthalocyanine-gold nanoparticle conjugates for photodynamic therapy: Effect of nanoparticle shape. Spectrochim Acta A Mol Biomol Spectrosc 2018; 203:85-95. [PMID: 29860172 DOI: 10.1016/j.saa.2018.05.081] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 05/25/2018] [Accepted: 05/26/2018] [Indexed: 06/08/2023]
Abstract
In this work, we report on the synthesis of tris-[(2,2,7,7-tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4',5'-d]pyran-5-yl)methoxy)-2-(4-benzo[d]thiazol-2-ylphenoxyphthalocyaninato] zinc(II) (complex 3) and its linkage to gold nanoparticles (AuNPs) of different shapes through S-Au/N-Au self-assembly. The conjugates of complex 3 (with both gold nanorods (AuNR) and nanospheres (AuNS)), displayed decreased fluorescence quantum yield with corresponding improved triplet and singlet quantum yields compared to complex 3 alone, however 3-AuNR showed improved properties than 3-AuNS. Complex 3 showed relatively low in vitro dark cytotoxicity against the epithelial breast cancer cells with cell survival ≥ 85% at concentration ≤ 160 μg/mL but afforded reduced photodynamic therapy activity which may be due to aggregation. 3-AuNR afforded superior PDT activity with <50% viable cells at concentration ≥ 40 μg/mL in comparison to 3-AuNS with <50% viable cells at concentration ≥ 80 μg/mL. The superior activity of 3-AuNR is attributed to the photothermal therapy effect since nanorods absorb more light at 680 nm than nanospheres.
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Affiliation(s)
- Edith Dube
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - David O Oluwole
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Njemuwa Nwaji
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Tebello Nyokong
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
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15
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Ngoy BP, Hlatshwayo Z, Nwaji N, Fomo G, Mack J, Nyokong T. Photophysical and optical limiting properties at 532 nm of BODIPY dyes with p-benzyloxystyryl groups at the 3,5-positions. J PORPHYR PHTHALOCYA 2018. [DOI: 10.1142/s1088424617500857] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The synthesis and characterization of a series of 3,5-di-[Formula: see text]-benzyloxystyrylBODIPY dyes with different substituents at the meso-aryl position is reported. The photophysical and nonlinear optical properties are described. BODIPYs of this type are found to be suitable for optical limiting at 532 nm on the nanosecond timescale. An enhancement of the population of the T[Formula: see text] state through the incorporation of bromine atoms at the 2,6-positions does not result in an enhancement of the optical limiting properties on a nanosecond timescale. This suggests that, in contrast with phthalocyanines, access to excited state absorption (ESA) from the T[Formula: see text] state through the introduction of a heavy atom effect does not provide a significantly improved reverse saturable absorbance response compared to ESA from the S[Formula: see text] state.
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Affiliation(s)
- Bokolombe P. Ngoy
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Zweli Hlatshwayo
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Njemuwa Nwaji
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Gertrude Fomo
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - John Mack
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Tebello Nyokong
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
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16
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Nwaji N, Mack J, Nyokong T. Photophysical and strong optical limiting properties of ball-type phthalocyanines dimers and their monomeric analogues. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.10.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Dube E, Nwaji N, Mack J, Nyokong T. The photophysicochemical behavior of symmetric and asymmetric zinc phthalocyanines, surface assembled onto gold nanotriangles. NEW J CHEM 2018. [DOI: 10.1039/c8nj02746c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The synthesis of a novel asymmetric ZnPc, (4-(4-(benzo[d]thiazol-2-yl)phenoxy)-2,10,17-tris(4-(2-carboxyethyl)phenoxy)phthalocyaninatol)zinc(ii), complex3, is reported.
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Affiliation(s)
- Edith Dube
- Centre for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Njemuwa Nwaji
- Centre for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - John Mack
- Centre for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Tebello Nyokong
- Centre for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
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18
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Oluwole DO, Nwaji N, Nene LC, Mokone L, Dube E, Nyokong T. Novel nano-dyad of homoleptic sandwich-type phthalocyanines with nitrogen doped graphene quantum dots for nonlinear optics. NEW J CHEM 2018. [DOI: 10.1039/c8nj01707g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and nonlinear optical (NLO) behaviour of three novel double decker sandwich-type phthalocyanine complexes and their conjugates with nitrogen doped graphene dots (NGQDs) were reported herein. The conjugates afforded the most efficient NLO behaviour.
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Affiliation(s)
- David O. Oluwole
- Center for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Njemuwa Nwaji
- Center for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Lindokhuhle C. Nene
- Center for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Lesedi Mokone
- Center for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Edith Dube
- Center for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Tebello Nyokong
- Center for Nanotechnology Innovation
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
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19
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Nwaji N, Achadu OJ, Nyokong T. Photo-induced resonance energy transfer and nonlinear optical response in ball-type phthalocyanine conjugated to semiconductor and graphene quantum dots. NEW J CHEM 2018. [DOI: 10.1039/c7nj05196d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ball-type zinc and gallium phthalocyanines were covalently linked to graphene and semiconductor quantum dots resulting in enhanced triplet parameters and nonlinear optical performance.
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Affiliation(s)
- Njemuwa Nwaji
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Ojodomo J. Achadu
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Tebello Nyokong
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
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20
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Dube E, Nwaji N, Oluwole DO, Mack J, Nyokong T. Investigation of photophysicochemical properties of zinc phthalocyanines conjugated to metallic nanoparticles. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.09.020] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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21
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Nwaji N, Jones B, Mack J, Oluwole DO, Nyokong T. Nonlinear optical dynamics of benzothiazole derivatized phthalocyanines in solution, thin films and when conjugated to nanoparticles. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.042] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Nwaji N, Bankole OM, Britton J, Nyokong T. Photophysical and nonlinear optical study of benzothiazole substituted phthalocyanines in solution and thin films. J PORPHYR PHTHALOCYA 2017. [DOI: 10.1142/s1088424617500079] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this study, the photophysical, nonlinear absorption and nonlinear optical limiting properties of zinc and gallium phthalocyanine complexes: tetrakis[(benzo[d]thiazol-2-yl phenoxy)phthalocyaninato]zinc(II) (3), tetrakis[(benzo[d]thiazol-2-yl phenoxy)phthalocyaninato] gallium(III) chloride (4), tetrakis[(benzo[d]thiazol-2-ylthio)phthalocyaninato] zinc(II) (5), tetrakis[(benzo[d]thiazol-2-ylthio)phthalocyaninato] gallium(III) chloride (6), were investigated both in solution and when embedded in polystyrene thin films using 532 nm laser excitation at 10 ns pulses. It was also observed that complexes that have higher triplet state absorption also possessed enhanced nonlinear and optical limiting behavior. Superior optical performance was observed when the complexes were embedded in thin films compared to when they are in solution. Complex 6 in thin films gave the highest imaginary third-order susceptibility (I[Formula: see text][X[Formula: see text]]) and hyperpolarizability ([Formula: see text] at 4.61 × 10[Formula: see text] esu and 3.44 × 10[Formula: see text] esu, respectively, with a low I[Formula: see text] value of 0.06 J.cm[Formula: see text]
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Affiliation(s)
- Njemuwa Nwaji
- Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Owolabi M. Bankole
- Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Jonathan Britton
- Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Tebello Nyokong
- Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
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23
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Nwaji N, Mack J, Britton J, Nyokong T. Synthesis, photophysical and nonlinear optical properties of a series of ball-type phthalocyanines in solution and thin films. NEW J CHEM 2017. [DOI: 10.1039/c6nj03662g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Ball-type phthalocyanines containing heavy central metals show enhanced nonlinear optical behaviour in solution or when embedded in polymer thin films. Time dependent density functional theory (TD-DFT) calculations were used to explain the spectra.
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Affiliation(s)
- Njemuwa Nwaji
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - John Mack
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Jonathan Britton
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Tebello Nyokong
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
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24
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Nwaji N, Mack J, Nyokong T. 4-Bis(4-aminophenoxy)phenoxy derivitized phthalocyanine conjugated to metallic nanoparticles: searching for enhanced optical limiting materials. NEW J CHEM 2017. [DOI: 10.1039/c7nj02718d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Amino derivative phthalocyanine linked to metallic nanoparticles showed enhanced photophysical and nonlinear optical response.
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Affiliation(s)
- Njemuwa Nwaji
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - John Mack
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
| | - Tebello Nyokong
- Department of Chemistry
- Rhodes University
- Grahamstown 6140
- South Africa
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