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Parajuli D, Kc D, Khattri KB, Adhikari DR, Gaib RA, Shah DK. Numerical assessment of optoelectrical properties of ZnSe-CdSe solar cell-based with ZnO antireflection coating layer. Sci Rep 2023; 13:12193. [PMID: 37500703 PMCID: PMC10374893 DOI: 10.1038/s41598-023-38906-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/17/2023] [Indexed: 07/29/2023] Open
Abstract
In this work, a numerical assessment of the optoelectrical properties of the ZnO-ZnSe-CdSe heterojunction for a thin and cost-effective solar cell was made by using the PC1D simulation software. The photovoltaic (PV) properties have been optimized by varying thicknesses of the absorber layer of the p-CdSe layer, the window layer of n-ZnSe, and the antireflection coating (ARC) layer of ZnO, a transparent conductive oxide with enhanced light trapping, and wide bandgap engineering. There is a positive conduction band offset (CBO) of ΔEc = 0.25 eV and a negative valence band offset (VBO) of ΔEv = 1.2 - 2.16 = - 0.96 eV. The positive CBO prevents the flow of electrons from the CdSe to the ZnSe layer. Further, the impact of doping concentration on the performance of solar cells has been analyzed. The simulation results reveal the increase in the efficiency of solar cells by adding an ARC. The rapid and sharp increase in the efficiency with the thickness of the window layer beyond 80 nm is interesting, unusual, and unconventional due to the combined effect of morphology and electronics on a macro-to-micro scale. The thin-film solar cell with the structure of ZnO/ZnSe/CdSe exhibited a high efficiency of 11.98% with short-circuit current (Isc) = 1.72 A, open-circuit voltage (Voc) = 0.81 V and fill factor (FF) = 90.8% at an optimized thickness of 2 μm absorber layer, 50 nm window layer, and 78 nm ARC layer. The EQE of solar cells has been observed at about 90% at a particular wavelength at 470 nm (visible light range). Around 12% of efficiency from such a thin-layered solar cell is highly applicable.
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Affiliation(s)
- D Parajuli
- Research Center for Applied Science and Technology, Tribhuvan University, Kirtipur, 44613, Nepal.
| | | | - Khim B Khattri
- Department of Mathematics, School of Science, Kathmandu University, Dhulikhel, 45210, Kavre, Nepal
| | - Dipak Raj Adhikari
- Graduate School of Science and Technology, Mid-west University, Birendranagar, 21700, Nepal
| | - Raid Anam Gaib
- Department of Electrical and Electronic Engineering, University of Tromso, 9019, Tromso, Norway
| | - Deb Kumar Shah
- School of Semiconductor and Chemical Engineering, Jeonbuk National University, Jeonju, 54896, Republic of Korea
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Li Z, Wang A, Zhou J, Chen Y, Liu H, Liu Y, Zhang Y, Ding P, Zhu X, Liang C, Qi Y, Liu E, Zhang G. A Universal Fluorescent Immunochromatography Assay Based on Quantum Dot Nanoparticles for the Rapid Detection of Specific Antibodies against SARS-CoV-2 Nucleocapsid Protein. Int J Mol Sci 2022; 23:ijms23116225. [PMID: 35682904 PMCID: PMC9180975 DOI: 10.3390/ijms23116225] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 05/27/2022] [Accepted: 05/30/2022] [Indexed: 11/16/2022] Open
Abstract
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is the pathogenic agent leading to COVID-19. Due to high speed of transmission and mutation rates, universal diagnosis and appropriate prevention are still urgently needed. The nucleocapsid protein of SARS-CoV-2 is considered more conserved than spike proteins and is abundant during the virus’ life cycle, making it suitable for diagnostic applications. Here, we designed and developed a fluorescent immunochromatography assay (FICA) for the rapid detection of SARS-CoV-2-specific antibodies using ZnCdSe/ZnS QDs-conjugated nucleocapsid (N) proteins as probes. The nucleocapsid protein was expressed in E.coli and purified via Ni-NTA affinity chromatography with considerable concentration (0.762 mg/mL) and a purity of more than 90%, which could bind to specific antibodies and the complex could be captured by Staphylococcal protein A (SPA) with fluorescence displayed. After the optimization of coupling and detecting conditions, the limit of detection was determined to be 1:1.024 × 105 with an IgG concentration of 48.84 ng/mL with good specificity shown to antibodies against other zoonotic coronaviruses and respiratory infection-related viruses (n = 5). The universal fluorescent immunochromatography assay simplified operation processes in one step, which could be used for the point of care detection of SARS-CoV-2-specific antibodies. Moreover, it was also considered as an efficient tool for the serological screening of potential susceptible animals and for monitoring the expansion of virus host ranges.
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Affiliation(s)
- Zehui Li
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Aiping Wang
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Jingming Zhou
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Yumei Chen
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Hongliang Liu
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Yankai Liu
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Ying Zhang
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Peiyang Ding
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Xifang Zhu
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Chao Liang
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Yanhua Qi
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Enping Liu
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
| | - Gaiping Zhang
- School of Life Science, Zhengzhou University, Zhengzhou 450001, China; (Z.L.); (A.W.); (J.Z.); (Y.C.); (H.L.); (Y.L.); (Y.Z.); (P.D.); (X.Z.); (C.L.); (Y.Q.); (E.L.)
- School of Advanced Agriculture Sciences, Peking University, Beijing 100871, China
- Longhu Laboratory of Advanced Immunology, Zhengzhou 450000, China
- Correspondence: ; Tel.: +86-371-6355-0369
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Timerbaev AR, Kuznetsova OV, Keppler BK. Current trends and challenges in analysis and characterization of engineered nanoparticles in seawater. Talanta 2021; 226:122201. [PMID: 33676721 DOI: 10.1016/j.talanta.2021.122201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/31/2021] [Accepted: 02/03/2021] [Indexed: 10/22/2022]
Abstract
With the increasingly wide use of engineered nanoparticles (ENPs), their release into the environment makes it important to determine in what quantitates they occur in aquatic systems and to understand their fate therein. In particular, detection and quantification of ENPs in seawater is challenging and often requires analytical methods to perform close to the feasibility confines. This review is aimed at critical analysis of current and emerging capabilities of analytical methods as have been employed for the analysis and characterization of ENPs in seawater in the last decade. An emphasis is given to the most reliable experimental strategies focused on avoiding the high-salt matrix effect and isolation and enrichment of the nanoparticulate fraction prior to analysis. Advanced analytical methodology in use basically relies on the application of elemental mass spectrometry to determine various particle-core metals and its single-particle mode to characterize the seawater-mediated transformation of ENPs, including dissolution, aggregation, etc. On the other hand, common microscopy, light scattering or X-ray based techniques are not sensitive enough to acquire the transformation information from real seawater samples. Finally, attention is pinpointed upon an acute shortcoming of the current research which is in the overwhelming majority of cases restricted to samples spiked with ENPs and often at excessive concentration levels.
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Affiliation(s)
- Andrei R Timerbaev
- Vernadsky Institute of Geochemistry and Analytical Chemistry, 119991, Moscow, Russian Federation.
| | - Olga V Kuznetsova
- Vernadsky Institute of Geochemistry and Analytical Chemistry, 119991, Moscow, Russian Federation
| | - Bernhard K Keppler
- Institute of Inorganic Chemistry, University of Vienna, 1090, Vienna, Austria
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An electrochemiluminescence immunosensor based on ZnSe@ZnS QDs composite for CEA detection in human serum. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.05.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Deng Y, Ok YS, Mohan D, Pittman CU, Dou X. Carbamazepine removal from water by carbon dot-modified magnetic carbon nanotubes. ENVIRONMENTAL RESEARCH 2019; 169:434-444. [PMID: 30530083 DOI: 10.1016/j.envres.2018.11.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/20/2018] [Accepted: 11/21/2018] [Indexed: 06/09/2023]
Abstract
Carbon dot- and magnetite-modified magnetic carbon nanotubes (CMNTs) were synthesized and evaluated for carbamazepine removal from water. The adsorbent was characterized by multiple modern surface and microstructure analyzing techniques. CMNTs were composed of three components including carbon dots (CDs), carbon nanotubes (CNTs) and magnetite. CDs and CNTs introduce abundant carboxyl groups onto CMNTs and magnetite allows rapid magnetic separation of the adsorbent realizable after batch adsorption. This adsorbent has a moderately high adsorption capacity of 65 mg-carbamazepine/g-adsorbent at pH 7.0 ± 0.2, which is superior to many reported adsorbents. Carbamazepine was uptaken well in a wide pH range, regardless of the surface charging of CMNTs. Its adsorption on CMNTs was quite fast and reached 80% of removal during the initial 3 h. The mass transfer within CMNTs and the time-dependent utilization, exhaustion and depletion of the adsorption capacity were successfully described using a simplified homogeneous surface diffusion model (HSDM). The surface diffusion coefficients (Ds) rose with increasing initial carbamazepine concentrations. After six regeneration and recycle experiments, the capacity loss of CMNTs was less than 2.2% at the conditions tested. FTIR spectra showed the characteristics of the components. Raman spectra implied a π-π electron donor-acceptor (EDA) interaction during adsorption. This work proposed a method of combining π-bond-rich materials (CNTs and CDs) and magnetite to make separable composite adsorbents with high affinity interactions between carbamazepine and carbon materials. The prepared adsorbent is attractive for carbamazepine removal due to its good performance, moderate cost, ease of separation, and ability to regenerate.
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Affiliation(s)
- Yanchun Deng
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China
| | - Yong Sik Ok
- Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Dinesh Mohan
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Charles U Pittman
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, United States
| | - Xiaomin Dou
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
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Johnson CA, Chern M, Nguyen TT, Dennis AM, Goldfarb JL. Ligands and media impact interactions between engineered nanomaterials and clay minerals. NANOIMPACT 2019; 13:112-122. [PMID: 31819907 PMCID: PMC6901284 DOI: 10.1016/j.impact.2019.01.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The exponential growth in technologies incorporating engineered nanomaterials (ENMs) requires plans to handle waste ENM disposal and accidental environmental release throughout the material life cycle. These scenarios motivate efforts to quantify and model ENM interactions with diverse background particles and solubilized chemical species in a variety of environmental systems. In this study, quantum dot (QD) nanoparticles and clay minerals were mixed in a range of water chemistries in order to develop simple assays to predict aggregation trends. CdSe QDs were used as a model ENM functionalized with either negatively charged or zwitterionic small molecule ligand coatings, while clays were chosen as an environmentally relevant sorbent given their potential as an economical water treatment technology and ubiquitous presence in nature. In our unbuffered experimental systems, clay type impacted pH, which resulted in a change in zwitterionic ligand speciation that favored aggregation with kaolinite more than with montmorillonite. With kaolinite, the zwitterionic ligand-coated QD exhibited greater than ten times the relative attachment efficiency for QD-clay heteroaggregation compared to the negatively charged ligand coated QD. Under some conditions, particle oxidative dissolution and dynamic sorption of ions and QDs to surfaces complicated the interpretation of the removal kinetics. This work demonstrates that QDs stabilized by small molecule ligands and electrostatic surface charges are highly sensitive to changes in water chemistry in complex media. Natural environments enable rapid dynamic physicochemical changes that will influence the fate and mobility of ENMs, as seen by the differential adsorption of water-soluble QDs to our clay media.
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Affiliation(s)
- Carol A Johnson
- Department of Mechanical Engineering, Boston University, Boston, MA 02215
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215
| | - Margaret Chern
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215
| | - Thuy T Nguyen
- Department of Biomedical Engineering, Boston University, Boston, MA 02215
| | - Allison M Dennis
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215
- Department of Biomedical Engineering, Boston University, Boston, MA 02215
| | - Jillian L Goldfarb
- Department of Mechanical Engineering, Boston University, Boston, MA 02215
- Division of Materials Science and Engineering, Boston University, Boston, MA 02215
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853
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