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Zulkepli N, Yunas J, Mohammad Haniff MAS, Dedi, Sirat MS, Johari MH, Mohd Maidin NN, Mohd Raub AA, Hamzah AA. Synthesis and Characterization of SiO 2-Based Graphene Nanoballs Using Copper-Vapor-Assisted APCVD for Thermoelectric Application. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:618. [PMID: 38607152 PMCID: PMC11013761 DOI: 10.3390/nano14070618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/23/2023] [Accepted: 07/10/2023] [Indexed: 04/13/2024]
Abstract
This study describes a method by which to synthesize SiO2-based graphene nanoballs (SGB) using atmospheric pressure chemical vapor deposition (APCVD) with copper vapor assistance. This method should solve the contamination, damage, and high costs associated with silica-based indirect graphene synthesis. The SGB was synthesized using APCVD, which was optimized using the Taguchi method. Multiple synthesis factors were optimized and investigated to find the ideal synthesis condition to grow SGB for thermoelectric (TE) applications. Raman spectra and FESEM-EDX reveal that the graphene formed on the silicon nanoparticles (SNP) is free from copper. The prepared SGB has excellent electrical conductivity (75.0 S/cm), which shows better results than the previous report. Furthermore, the SGB nanofillers in bismuth telluride (Bi2Te3) nanocomposites as TE materials exhibit a significant increment in Seebeck coefficients (S) compared to the pure Bi2Te3 sample from 109 to 170 μV/K at 400 K, as well as electrical resistivity decrement. This approach would offer a simple strategy to improve the TE performance of commercially available TE materials, which is critical for large-scale industrial applications.
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Affiliation(s)
- Nurkhaizan Zulkepli
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
- Centre of Foundation Studies, Universiti Teknologi MARA, Cawangan Selangor, Kampus Dengkil, Dengkil 43800, Selangor, Malaysia
| | - Jumril Yunas
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
| | - Muhammad Aniq Shazni Mohammad Haniff
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
| | - Dedi
- Research Center for Advanced Materials, National Research and Innovation Agency (BRIN), South Tangerang 15314, Banten, Indonesia;
| | - Mohamad Shukri Sirat
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
| | - Muhammad Hilmi Johari
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
| | - Nur Nasyifa Mohd Maidin
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
| | - Aini Ayunni Mohd Raub
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
| | - Azrul Azlan Hamzah
- Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi 46300, Selangor, Malaysia; (N.Z.); (M.A.S.M.H.); (M.S.S.); (M.H.J.); (N.N.M.M.); (A.A.M.R.)
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Pei W, Wang Z, Xia W, Huang Z, Wang P, Liu Y, Zhou S, Tu Y, Zhao J. Rational Design of Full-Color Fluorescent C 3N Quantum Dots. J Phys Chem Lett 2024; 15:1161-1171. [PMID: 38270087 DOI: 10.1021/acs.jpclett.3c03491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
Carbon-based quantum dots (QDs) exhibit unique photoluminescence due to size-dependent quantum confinement, giving rise to fascinating full-color emission properties. Accurate emission calculations using time-dependent density functional theory are a time-costing and expensive process. Herein, we employed an artificial neural network (ANN) combined with statistical learning to establish the relationship between geometrical/electronic structures of ground states and emission wavelength for C3N QDs. The emission energy of these QDs can be doubly modulated by size and edge effects, which are governed by the number of C4N2 rings and the CH group, respectively. Moreover, these two structural characteristics also determine the phonon vibration mode of C3N QDs to harmonize the emission intensity and lifetime of hot electrons in the electron-hole recombination process, as indicated by nonadiabatic molecular dynamics simulation. These computational results provide a general approach to atomically precise design the full-color fluorescent carbon-based QDs with targeted functions and high performance.
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Affiliation(s)
- Wei Pei
- College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China
| | - Zi Wang
- College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China
| | - Weizhi Xia
- College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China
| | - Zhijing Huang
- College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China
| | | | - Yongfeng Liu
- College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China
| | - Si Zhou
- School of Physics, South China Normal University, Guangzhou 510631, China
| | - Yusong Tu
- College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, China
| | - Jijun Zhao
- School of Physics, South China Normal University, Guangzhou 510631, China
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Shin DH, Jung DH, Lee H. Semitransparent Solar Cells Employing n-Type Graphene on LaVO 3. ACS OMEGA 2023; 8:18695-18701. [PMID: 37273583 PMCID: PMC10233660 DOI: 10.1021/acsomega.3c00598] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 05/04/2023] [Indexed: 06/06/2023]
Abstract
To effectively utilize solar energy, semitransparent solar cells are essential in various fields such as building-integrated solar power generation and portable solar chargers. We report triethylenetetramine (TETA)-doped graphene (Gr) transparent conductive electrode (TCE)-based LaVO3 semitransparent solar cells. To optimize the Gr TCE, we varied the TETA molar concentration (nD) from 0.1 to 0.3 mM. TETA-doped Gr (TETA-Gr)/LaVO3 semitransparent solar cells exhibit the highest 1.45% efficiency and 62% average visible transmittance at nD = 0.2 mM. These results indicate that the TETA-Gr/LaVO3 structure not only harvests solar energy in the ultraviolet-visible region but also exhibits translucency, thanks to the thin film. Thanks to its translucent properties, we improved the power conversion efficiency (PCE) to 1.99% by adding an Al reflective mirror to the semitransparent cells. Finally, the device's PCE loss is only within 3% for 3000 h in air, suggesting good durability.
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Affiliation(s)
- Dong Hee Shin
- Department
of Smart Sensor Engineering, Andong National
University, Andong, Gyeongbuk 36729, Republic of Korea
| | - Dae Ho Jung
- Department
of Applied Physics, Institute of Natural Sciences, and Integrated
Education Institute for Frontier Science and Technology (BK21 Four), Kyung Hee University, Yongin 17104, Republic of Korea
| | - Hosun Lee
- Department
of Applied Physics, Institute of Natural Sciences, and Integrated
Education Institute for Frontier Science and Technology (BK21 Four), Kyung Hee University, Yongin 17104, Republic of Korea
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Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications. CRYSTALS 2021. [DOI: 10.3390/cryst11111317] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Nanostructuring is a commonly employed method of obtaining superior mechanical properties in metals and alloys. Compared to conventional polycrystalline counterparts, nanostructuring can provide remarkable improvements in yield strength, toughness, fatigue life, corrosion resistance, and hardness, which is attributed to the nano grain size. In this review paper, the current state-of-the-art of synthesis methods of nanocrystalline (NC) materials such as rapid solidification, chemical precipitation, chemical vapor deposition, and mechanical alloying, including high-energy ball milling (HEBM) and cryomilling was elucidated. More specifically, the effect of various process parameters on mechanical properties and microstructural features were explained for a broad range of engineering materials. This study also explains the mechanism of grain strengthening using the Hall-Petch relation and illustrates the effects of post-processing on the grain size and subsequently their properties. This review also reports the applications, challenges, and future scope for the NC materials.
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