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Fang XW, Chang H, Wu T, Yeh CH, Hsiao FL, Ko TS, Hsieh CL, Wu MY, Lin YW. Green Synthesis of Carbon Quantum Dots and Carbon Quantum Dot-Gold Nanoparticles for Applications in Bacterial Imaging and Catalytic Reduction of Aromatic Nitro Compounds. ACS OMEGA 2024; 9:23573-23583. [PMID: 38854549 PMCID: PMC11154949 DOI: 10.1021/acsomega.4c00833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/13/2024] [Accepted: 04/16/2024] [Indexed: 06/11/2024]
Abstract
This study delves into the green synthesis and multifaceted applications of three types of carbon quantum dots (CQDs), namely, CQDs-1, CQDs-2, and CQDs-3. These CQDs were innovatively produced through a gentle pyrolysis process from distinct plant-based precursors: genipin with glucose for CQDs-1, genipin with extracted gardenia seeds for CQDs-2, and genipin with whole gardenia seeds for CQDs-3. Advanced analytical techniques, including X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR), were employed to detail the CQDs' structural and surface characteristics, revealing their unique functional groups and surface chemistries. The study further explores the CQDs' bioimaging potential, where confocal fluorescence microscopy evidenced their swift uptake by Escherichia coli bacteria, indicating their suitability for bacterial imaging. These CQDs were also applied in the synthesis of gold nanoparticles (AuNPs), acting as reducing agents and stabilizers. Among these, CQD3-AuNPs were distinguished by their remarkable stability and catalytic efficiency, achieving a 99.7% reduction of 4-nitrophenol to 4-aminophenol in just 10 min and maintaining near-complete reduction efficiency (99.6%) after 60 days. This performance notably surpasses that of AuNPs synthesized using sodium citrate, underscoring the exceptional capabilities of CQD3-AuNPs. These insights pave the way for leveraging CQDs and CQD-stabilized AuNPs in bacterial imaging and catalysis, presenting valuable directions for future scientific inquiry and practical applications.
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Affiliation(s)
- Xuan-Wei Fang
- Department
of Chemistry, National Changhua University
of Education, 1 Jin-De Road Changhua City 50007, Taiwan
| | - Hao Chang
- Department
of Chemistry, National Changhua University
of Education, 1 Jin-De Road Changhua City 50007, Taiwan
| | - Tsunghsueh Wu
- Department
of Chemistry, University of Wisconsin-Platteville, 1 University Plaza Platteville Wisconsin 53818-3099, United States
| | - Chen-Hao Yeh
- Department
of Materials Science and Engineering, Feng
Chia University, 100, Wenhwa Road Taichung City 40724, Taiwan
| | - Fu-Li Hsiao
- Graduate
Institute of Photonics, National Changhua
University of Education, 1 Jin-De Road Changhua City 50007, Taiwan
| | - Tsung-Shine Ko
- Department
of Electronic Engineering, National Changhua
University of Education, 1 Jin-De Road Changhua City 50007, Taiwan
| | - Chiu-Lan Hsieh
- Department
of Biology, National Changhua University
of Education, 1 Jin-De Road Changhua City 50007, Taiwan
| | - Mei-Yao Wu
- School
of Post-baccalaureate Chinese Medicine, China Medical University, 91, Hsueh-Shih Road Taichung 40424, Taiwan
| | - Yang-Wei Lin
- Department
of Chemistry, National Changhua University
of Education, 1 Jin-De Road Changhua City 50007, Taiwan
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Ahmad S, Xu Q, Tariq M, Song M, Liu C, Yan H. Assessing the Potential of Aconitum Laeve Extract for Biogenic Silver and Gold Nanoparticle Synthesis and Their Biological and Catalytic Applications. Molecules 2024; 29:2640. [PMID: 38893515 PMCID: PMC11173888 DOI: 10.3390/molecules29112640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 05/13/2024] [Accepted: 05/21/2024] [Indexed: 06/21/2024] Open
Abstract
The adoption of green chemistry protocols in nanoparticle (NP) synthesis has exhibited substantial potential and is presently a central focus in research for generating versatile NPs applicable across a broad spectrum of applications. In this scientific contribution, we, for the first time, examined the ability of Aconitum Laeve (A. Laeve) crude extract to synthesize silver and gold nanoparticles (AgNPs@AL; AuNP@AL) and explored their potential applications in biological activities and the catalytic degradation of environmental pollutants. The synthesized NPs exhibited a distinctive surface plasmon resonance pattern, a spherical morphology with approximate sizes of 5-10 nm (TEM imaging), a crystalline architecture (XRD analysis), and potential functional groups identified by FTIR spectroscopy. The antibacterial activity was demonstrated by inhibition zones that measured 16 and 14 mm for the AgNPs@AL and AuNP@AL at a concentration of 80 µg/mL against Staphylococcus aureus and 14 and 12 mm against Escherichia coli, respectively. The antioxidant potential of the synthesized NPs was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-Oxide (PTIO), and 3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays. Our findings suggest that the AuNP@AL effectively countered the tested radicals considerably, displaying IC50 values of 115.9, 103.54, and 180.85 µg/mL against DPPH, PTIO, and ABTS, respectively. In contrast, the AgNPs@AL showed IC50 values of 144.9, 116.36, and 95.39 µg/mL against the respective radicals. In addition, both the NPs presented significant effectiveness in the photocatalytic degradation of methylene blue and rhodamine B. The overall observations indicate that A. Laeve possesses a robust capability to synthesize spherical nanoparticles, exhibiting excellent dispersion and showcasing potential applications in both biological activities and environmental remediation.
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Affiliation(s)
- Shahbaz Ahmad
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China; (S.A.); (M.S.); (C.L.)
| | - Qianqian Xu
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China; (S.A.); (M.S.); (C.L.)
| | - Muhammad Tariq
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
| | - Meijie Song
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China; (S.A.); (M.S.); (C.L.)
| | - Chao Liu
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China; (S.A.); (M.S.); (C.L.)
| | - Hai Yan
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China; (S.A.); (M.S.); (C.L.)
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Dragos-Pinzaru OG, Buema G, Racila L, Ababei G, Borza F, Stoian G, Tabakovic I, Lupu N. High Catalytic Activity of Co xPt 100-x Alloys for Phenolic Compound Reduction. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:599. [PMID: 38607133 PMCID: PMC11013317 DOI: 10.3390/nano14070599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/13/2024]
Abstract
In this study, we report the influence of the Pt concentration in CoxPt100-x alloys on the catalytic activity of the alloys for 4-nitrophenol (4-NP) reduction. More precisely, a series of CoxPt100-x alloys with a Pt concentration ranging between 60% and 95% were prepared using electrodeposition at controlled potentials from stable hexachloroplatinate aqueous solution. The Pt concentration was tuned by varying the electrodeposition potential from -0.6 to -0.9 V. The changes in the CoxPt100-x alloy microstructure and crystalline structure have been investigated using SEM and TEM analysis. Our results show that the microstructure and the crystalline structure of the as-prepared materials do not depend on the electrodeposition potential. However, the catalytic activity of CoxPt100-x alloys is closely correlated with the potential applied during electrochemical synthesis, hence the Pt content. We demonstrated that the synthesized materials present a high catalytic activity (approx. 90%) after six cycles of reusability despite the fact that the Pt content of the as-prepared alloys decreases. The easy preparation method that guarantees more than 97% catalytic activity of the CoxPt100-x alloys, the easy recovery from solution, and the possibility of reusing the CoxPt100-x alloys are the benefits of the present study.
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Affiliation(s)
| | - Gabriela Buema
- National Institute of R&D for Technical Physics, 700050 Iasi, Romania; (O.-G.D.-P.); (G.A.); (F.B.); (G.S.); (N.L.)
| | - Luiza Racila
- National Institute of R&D for Technical Physics, 700050 Iasi, Romania; (O.-G.D.-P.); (G.A.); (F.B.); (G.S.); (N.L.)
| | - Gabriel Ababei
- National Institute of R&D for Technical Physics, 700050 Iasi, Romania; (O.-G.D.-P.); (G.A.); (F.B.); (G.S.); (N.L.)
| | - Firuta Borza
- National Institute of R&D for Technical Physics, 700050 Iasi, Romania; (O.-G.D.-P.); (G.A.); (F.B.); (G.S.); (N.L.)
| | - George Stoian
- National Institute of R&D for Technical Physics, 700050 Iasi, Romania; (O.-G.D.-P.); (G.A.); (F.B.); (G.S.); (N.L.)
| | - Ibro Tabakovic
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55435, USA;
| | - Nicoleta Lupu
- National Institute of R&D for Technical Physics, 700050 Iasi, Romania; (O.-G.D.-P.); (G.A.); (F.B.); (G.S.); (N.L.)
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Qi J, Zhou H, Tang J. Facile preparation of small-sized gold nanoparticle decorated silica nanocomposites and their morphological changes in catalytic reactions. NANOTECHNOLOGY 2024; 35:125702. [PMID: 38096572 DOI: 10.1088/1361-6528/ad15bc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 12/14/2023] [Indexed: 01/05/2024]
Abstract
Due to the unique physicochemical properties of gold nanoparticles (AuNPs) decorated silica nanostructures (SiO2@AuNPs), they show great potential for applications in catalysis, biosensing, optical devices and medicine. It is essential to explore the catalytic effect of SiO2@AuNPs and the understanding of the essential process of catalytic reactions. We have prepared SiO2@AuNPs by loading small-sized AuNPs on surface-modified silica nanospheres. SiO2@AuNPs was used as a catalyst for the catalytic reduction of 4-nitrophenol (4-NP) in the presence of excess NaBH4, and the results showed that with the increase of the amount of catalyst from 30 to 100μl, the corresponding rate constantKappwas increased from 6.44 × 10-3to 1.45 × 10-2s-1, and its TOF was as high as 1.326 × 103h-1, and the catalytic rate could still be maintained at 87% after five cycles. By analyzing the morphology and size of the SiO2supported AuNPs before and after the catalytic reaction, it can be seen that the atoms on the surface of small-sized AuNPs supported by silica have migrated during the catalytic process, which subsequently affects the catalytic efficiency of the structure. This study proves the good catalytic effect of SiO2@AuNPs structure and lays the foundation for its wider application.
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Affiliation(s)
- Jinhui Qi
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, People's Republic of China
| | - Haichun Zhou
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, People's Republic of China
| | - Junqi Tang
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, People's Republic of China
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Kalidhasan S, Lim YS, Chu EA, Choi J, Lee HY. Phospholipid-derived Au and Au-Cu suspensions as efficient peroxide and borohydride activators for organic molecules degradation: Performance and sustainable catalytic mechanism. CHEMOSPHERE 2024; 346:140567. [PMID: 38303386 DOI: 10.1016/j.chemosphere.2023.140567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 02/03/2024]
Abstract
In the contemporary context, executing light-oxidant- and reductant-driven reactions in solution-phase processes remains challenging mainly due to the lack of general tools for understanding the reactive potential of nano-functional catalysts. In this study, dual-active nanometals (Au and Cu doped with Au) capped within soy lecithin (SL), were developed and characterized, combining flexibility with the catalytic advantages and stability of liquid-phase catalysts. The as-synthesized SL-Au (LG) and SL-Au-Cu (LGC) catalysts were efficiently degraded rhodamine B (RB, 100%) in the presence of H2O2 under light irradiation (350 W lamp) at wide pH range (3-7) within 4.5 h and p-nitrophenol (p-NP, >90% degradation at pH 7) in the presence of NaBH4 under normal stirring with slower kinetics (∼72 h). RB degradation followed a pseudo-second-order kinetic model with a higher r2, and p-NP degradation followed first-order kinetics. The active sites embedded within the structural order of SL arrangement displayed elevated catalytic activity, which was further enhanced by the movement of intermediate/excited states and charged elements within the metal suspended in the phospholipid (LG and LGC). The self-regulating tunability of the physicochemical characteristics of these catalysts provides a convenient and generalizable platform for the transformation of modern dual-active (redox) catalysts into dynamic homogeneous equivalents.
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Affiliation(s)
- Sethu Kalidhasan
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do, 39177, Republic of Korea.
| | - Yeon-Su Lim
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do, 39177, Republic of Korea
| | - Eun-Ae Chu
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do, 39177, Republic of Korea
| | - Jonghoon Choi
- School of Integrative Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea; Nanomedicine Corp., Seoul, 06974, Republic of Korea.
| | - Hee-Young Lee
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do, 39177, Republic of Korea.
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6
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Zhang H, Wang L, Liu Z, Su Y, Du C. Construction of novel photocatalysts for efficient hydrogen evolution: The key role of natural halloysite nanotubes. J Colloid Interface Sci 2023; 650:1211-1224. [PMID: 37478738 DOI: 10.1016/j.jcis.2023.07.094] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 06/28/2023] [Accepted: 07/14/2023] [Indexed: 07/23/2023]
Abstract
Hydrogen (H2) evolution by photocatalytic water splitting is a potential strategy to solve worldwide energy shortage. Sulfide nanocatalysts showed great potential for H2 evolution, but suffered from low charge separation efficiency and easy agglomeration. In this work, ZnIn2S4 (ZIS) nanoflowers were anchored onto the surface of halloysite nanotubes (HNTs) modified by ethylenediaminetetraacetic acid (EDTA). Photocatalyst 3ZnIn2S4-HNTs/EDTA3 (3ZIS-HNTs/E3) displayed the optimum H2 evolution rate of 10.4 mmol·g-1·h-1, being 3.4 times as that of the original ZIS. Moreover, 3ZIS-HNTs/E3 presented satisfied property in the photocatalytic hydrogenation reaction of 4-nitrophenol to produce 4-aminophenol. HNTs as substrates not only hindered the growth and agglomeration of ZIS, but also induced more S vacancies in ZIS. The production of Schottky junctions between ZIS and Pt, the high utilization of light energy in tubular HNTs, and the trapping effect of EDTA for photogenerated h+ were all favorable for enhancing the catalytic property. The density functional theory (DFT) calculations showed that 3ZIS-HNTs/E3 with more S vacancies had the lowest adsorption energy and the most appropriate ΔGH* for H* to enhance the H2 evolution efficiency, which was consistent with the experimental catalytic results. This study contributes a novel thought for synthesizing composites on the basis of natural minerals for taking part in and enhancing the catalytic performance.
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Affiliation(s)
- Hao Zhang
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia, 010021, PR China
| | - Le Wang
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia, 010021, PR China
| | - Zhiliang Liu
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia, 010021, PR China
| | - Yiguo Su
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia, 010021, PR China.
| | - Chunfang Du
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia, 010021, PR China.
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Alshangiti DM, Ghobashy MM, Alqahtani HA, El-Damhougy TK, Madani M. The energetic and physical concept of gold nanorod-dependent fluorescence in cancer treatment and development of new photonic compounds|review. RSC Adv 2023; 13:32223-32265. [PMID: 37928851 PMCID: PMC10620648 DOI: 10.1039/d3ra05487j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Accepted: 10/10/2023] [Indexed: 11/07/2023] Open
Abstract
The optical features of gold nanorods (GNR) may be precisely controlled by manipulating their size, shape, and aspect ratio. This review explores the impact of these parameters on the optical tuning of (GNR). By altering the experimental conditions, like the addition of silver ions during the seed-mediated growth process, the aspect ratio of (GNR) may be regulated. The shape is trans from spherical to rod-like structures resulting in noticeable changes in the nanoparticles surface plasmons resonance (SPR) bands. The longitudinal SPR band, associated with electron oscillations along the long axis, exhibits a pronounced red shift into the (NIR) region as the aspect ratio increases. In contrast, the transverse SPR band remains relate unchanged. Using computational methods like the discrete dipole approximation (DDA) allows for analyzing absorption, scattering, and total extinction features of gold (G) nanoparticles. Studies have shown that increasing the aspect ratio enhances the scattering efficiency, indicating a higher scattering quantum yield (QY). These findings highlight the importance of size, shape, and aspect ratio in controlling the optical features of (GNR) providing valuable insights for various uses in nanophotonics and plasmonic-dependent fluorescence in cancer treatment and developing new photonic compound NRs.
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Affiliation(s)
- Dalal Mohamed Alshangiti
- College of Science and Humanities-Jubail, Imam Abdulrahman Bin Faisal University Jubail Saudi Arabia
| | - Mohamed Mohamady Ghobashy
- Radiation Research of Polymer Chemistry Department, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority P.O. Box 29, Nasr City Cairo Egypt
| | - Haifa A Alqahtani
- Department of Biology, College of Science, Imam Abdulrahman Bin Faisal University Dammam 31441 Saudi Arabia
| | - Tasneam K El-Damhougy
- Department of Chemistry, Faculty of Science (Girls), Al-Azhar University P.O. Box 11754, Yousef Abbas Str., Nasr City Cairo Egypt
| | - Mohamed Madani
- College of Science and Humanities-Jubail, Imam Abdulrahman Bin Faisal University Jubail Saudi Arabia
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Chen X, Qi Y, He B, Liang Y, Lei Y, Sun J. Fabrication of Adjustable Au/Carbon Hybrid Nanozymes with Photothermally Enhanced Peroxidase Activity and Ultra-sensitivity for Glutathione Detection. ACS APPLIED MATERIALS & INTERFACES 2023; 15:20788-20799. [PMID: 37071845 DOI: 10.1021/acsami.3c02420] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Au nanozymes are extensively researched for their photothermal effect and catalytic performance, but overcoming the inherent defects of poor dispersibility and thermal stability through complementary materials will expand their prospects for biological applications. Herein, several novel CAu nanozymes were fabricated by in situ reduction of chloroauric acid on hollow carbon nanospheres (HCNs). Through regulating the number of reductions, sesame ball-shaped CAu (sCAu) with highly dispersed Au nanoparticles and diversity-shaped CAu (dCAu) were obtained. The number and morphology of loaded Au nanoparticles, absorption spectra, and hydrophilicity of CAu nanozymes were systematically characterized to demonstrate the flexibility of this novel method. The high-efficiency peroxidase-like sCAu0.3 nanozyme with hyperthermia-activated property was then screened for later bio-application. It is worth mentioning that its photothermal-promoted peroxidase-like activity could be achieved under near-infrared laser irradiation. Moreover, sCAu0.3 could specifically achieve glutathione detection in human blood samples. This method will provide a protocol for the regulation of CAu nanozymes to adapt to bio-detection applications.
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Affiliation(s)
- Xinyan Chen
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Yu Qi
- China Meat Research Center, Beijing 100068, PR China
| | - Bin He
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Yu Liang
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Yu Lei
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Jian Sun
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
- Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, PR China
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9
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Yuan X, Ge L, Zhou H, Tang J. Size, composition, and surface capping-dependent catalytic activity of spherical gold nanoparticles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 287:122082. [PMID: 36370632 DOI: 10.1016/j.saa.2022.122082] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/30/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Gold nanostructures are used as catalysts in heterogeneous catalytic processes and have intrigued chemists and materials scientists. Isotropic spherical gold nanoparticles (AuNPs) are ideal for catalysis due to their simple preparation process, controllable surface-active site, tunable size, and composition-dependent catalytic activity. In this study, spherical AuNPs with different size, composition, and surface capping agents have been prepared, and their catalytic activity in reduction of 4-nitrophenol (4-NP) is evaluated. The catalytic activity of AuNPs decreases as their size increases. Meanwhile, the catalytic activity of AuNPs with tartrate as the reducing agent show no evident changes because of containing anisotropic AuNPs. Moreover, silver not only improves monodisperse and spherical AuNPs, but also increases the catalytic activity of small AuNPs. Since the molecular structures of tartrate and citrate are similar, there is no remarkable difference in the catalytic activity of AuNPs using tartrate and citrate as capping agents. These results demonstrate the influence of size, composition, and surface capping on the catalytic activity of AuNPs. Overall, this study facilitates the applicability of gold-based catalyst and AuNPs in plasmonics, nanophotonics, biomedical photonics, and photocatalysis.
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Affiliation(s)
- Xujing Yuan
- College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
| | - Linlin Ge
- College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
| | - Haichun Zhou
- College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
| | - Junqi Tang
- College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
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