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Vu AT, Mac VH, Nguyen TH, Nguyen TH. Preparation of carnation-like Ag-ZnO composites for enhanced photocatalysis under visible light. NANOTECHNOLOGY 2023; 34:275602. [PMID: 37015211 DOI: 10.1088/1361-6528/acca24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 04/04/2023] [Indexed: 06/19/2023]
Abstract
Carnation-like ZnO was synthesized by the facile precipitation method (at room temperature and in 120 min) to decompose dyes in an aqueous medium. The carnation-like ZnO had a stratified porous structure with a size of about 2-3μm, its petals had a smooth surface with a thickness of 5-10 nm and a width of about 300-500 nm. Ag-ZnO composites were synthesized using glucose with the assistance of PVP. The morphology of Ag-ZnO composites was almost unchanged compared to ZnO. Where, the Ag nanoparticles in the size range of 5-15 nm were uniformly dispersed on the ZnO petals, improving the catalytic ability of the composites in tartrazine (TA) degradation. The influence of Ag content on catalytic structure and performance of composite was studied. The 5Ag-ZnO sample had the highest BET surface area and pore volume and the lowest gap energy (Eg) among the as-synthesized samples. The 5Ag-ZnO sample proclaimed the degradation efficiency in 70 min of 97.8% and thekapof 0.031 min-1. The influences of catalyst content, solution pH, and concentration of dye on the photodegradation efficiency of the composite were thoroughly studied. Besides, the photocatalytic activity of the composite was demonstrated by degrading various organic substances and reusability. In addition, it was compared to a metal-semiconductor catalyst of Au-ZnO and semiconductor-semiconductor catalysts of MoS2-ZnO, Cu2O-ZnO, and SiO2-ZnO. The catalytic mechanism under visible light was proposed.
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Affiliation(s)
- Anh-Tuan Vu
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
| | - Van Hung Mac
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
| | - Thanh Hung Nguyen
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
| | - Thu Huong Nguyen
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
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Influence of Ag Photodeposition Conditions over SERS Intensity of Ag/ZnO Microspheres for Nanomolar Detection of Methylene Blue. NANOMATERIALS 2021; 11:nano11123414. [PMID: 34947762 PMCID: PMC8705486 DOI: 10.3390/nano11123414] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 11/24/2021] [Accepted: 12/13/2021] [Indexed: 11/29/2022]
Abstract
Surface enhanced Raman spectroscopy (SERS) is considered a versatile and multifunctional technique with the ability to detect molecules of different species at very low molar concentration. In this work, hierarchical ZnO microspheres (ZnO MSs) and Ag/ZnO MSs were fabricated and decorated by hydrothermal and photodeposition methods, respectively. For Ag deposition, precursor molar concentration (1.9 and 9.8 mM) and UV irradiation time (5, 15, and 30 min) were evaluated by SEM, TEM, X-ray diffraction and Raman spectroscopy. X-ray diffraction showed a peak at 37.9° corresponding to the (111) plane of Ag, whose intensity increases as precursor concentration and UV irradiation time increases. SEM images confirmed the formation of ZnO MSs (from 2.5 to 4.5 µm) building by radially aligned two-dimensional ZnO nanosheets with thicknesses below 30 nm. The Raman spectra of Ag/ZnO MSs exhibited a vibration mode at 486 cm−1 which can be directly associated to Ag deposition on ZnO MSs surface. The performance of SERS substrate was evaluated using rhodamine 6G. The SERS substrate grown at 9.8 mM during 30 min showed the best SERS activity and the ability to detect methylene blue at 10−9 M.
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Pham TN, Thi Hue N, Lee YC, Huy TQ, Thi Thu Thuy N, Tuan HV, Khi NT, Phan VN, Thanh TD, Lam VD, Le AT. A hybrid design of Ag-decorated ZnO on layered nanomaterials (MgAC) with photocatalytic and antibacterial dual-functional abilities. RSC Adv 2021; 11:38578-38588. [PMID: 35493260 PMCID: PMC9044211 DOI: 10.1039/d1ra08365a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 11/18/2021] [Indexed: 12/14/2022] Open
Abstract
In this work, Ag@ZnO and Ag@ZnO/MgAC photocatalysts were synthesized using a simple two-step electrochemical method by the addition of magnesium aminoclay (MgAC) as a great stabilizer and a Lewis base, which could donate electrons for reduction of Ag+ and Zn2+ ions, facilitating uniform formation as well as effective inhibition of aggregation of Ag@ZnO nanoparticles (NPs) on the MgAC matrix. Ag@ZnO and Ag@ZnO/MgAC were investigated for photocatalytic degradation of MB and their antibacterial efficiencies. Ag@ZnO/MgAC showed excellent photocatalytic MB degradation with a performance of 98.56% after 80 min of visible-light irradiation and good antibacterial activity against Salmonella (Sal) and Staphylococcus aureus (S. aureus) bacterial strains, providing promising high application potential. Herein, different from the bare ZnO NPs, for Ag@ZnO/MgAC nanocomposites, Ag@ZnO NPs functioned as an effective photocatalyst under visible light illumination, in which, incorporated Ag atoms in the ZnO crystal structure caused the increase in a larger number of lattice defect sites. Benefiting from the strong surface plasmon resonance (SPR) effect of Ag and energy band matching between ZnO and Ag, the visible light absorption capacity and the separation of the photogenerated charge carriers were promoted. Therefore, the MB degradation efficiency of Ag@ZnO/MgAC was considerably accelerated in the presence of produced radicals from visible light illumination. Dual-functional Ag@ZnO/MgAC nanocomposites for photocatalytic and antibacterial applications synthesized by a simple two-step electrochemical method.![]()
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Affiliation(s)
- Tuyet Nhung Pham
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam
| | - Nguyen Thi Hue
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam
| | - Young-Chul Lee
- Department of BioNano Technology, Gachon University 1342 Seongnam-Daero, Sujeong-Gu Seongnam-Si Gyeonggi-do 13120 Republic of Korea
| | - Tran Quang Huy
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam
| | - Nguyen Thi Thu Thuy
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam
| | - Hoang Van Tuan
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam
| | - Nguyen Tien Khi
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam .,Faculty of Biotechnology, Chemistry and Environmental Engineering, PHENIKAA University Hanoi 12116 Vietnam
| | - Vu Ngoc Phan
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam .,Faculty of Biotechnology, Chemistry and Environmental Engineering, PHENIKAA University Hanoi 12116 Vietnam
| | - Tran Dang Thanh
- Graduate University of Science and Technology (GUST), Institute for Materials Science (IMS), Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi 10000 Vietnam
| | - Vu Dinh Lam
- Graduate University of Science and Technology (GUST), Institute for Materials Science (IMS), Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi 10000 Vietnam
| | - Anh-Tuan Le
- Phenikaa University Nano Institute (PHENA), PHENIKAA University Hanoi 12116 Vietnam .,Faculty of Materials Science and Engineering, PHENIKAA University Hanoi 12116 Vietnam
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Jani NA, Haw C, Chiu W, Rahman SA, Khiew P, Lim Y, Abd-Shukor R, Hamid MAA. Photodeposition of Ag Nanocrystals onto TiO 2 Nanotube Platform for Enhanced Water Splitting and Hydrogen Gas Production. JOURNAL OF NANOMATERIALS 2020; 2020:1-11. [DOI: 10.1155/2020/7480367] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Current work reports the study of Ag nanocrystals (NCs) decorated doubly anodized (DA) TiO2 nanotubes (NTs) thin film as an efficient photoelectrode material for water splitting and photocatalytic hydrogen gas production. DA process has been shown to be capable of producing less defective NTs and creating additional spacious gaps in between NT bundles to allow efficient and uniform integration of Ag NCs. By employing photoreduction method, Ag NCs can be deposited directly onto NTs, where the size and density of coverage can be maneuvered by merely varying the concentration of Ag precursors. Field emission scanning electron microscope (FESEM) images show that the Ag NCs with controllable size are homogeneously decorated onto the walls of NTs with random yet uniform distribution. X-ray diffraction (XRD) results confirm the formation of anatase TiO2 NTs and Ag NCs, which can be well indexed to standard patterns. The decoration of metallic Ag NCs onto the surface of NTs demonstrates a significant enhancement in the photoconversion efficiency as compared to that of pristine TiO2 NTs. Additionally, the as-prepared nanocomposite film also shows improved efficiency when used as a photocatalyst platform in the production of hydrogen gas. Such improvement in the performance of water splitting and photocatalytic hydrogen gas production activity can be credited to the surface plasmonic resonance of Ag NCs present on the surface of the NTs, which renders improved light absorption and better charge separation. The current work can serve as a model of study for designing more advanced nanoarchitecture photoelectrode for renewable energy application.
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Affiliation(s)
- Nur Aimi Jani
- Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University Malaya, Kuala Lumpur 50603, Malaysia
- Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, 40450 Selangor, Malaysia
| | - Choonyian Haw
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor Darul Ehsan 43900, Malaysia
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Weesiong Chiu
- Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University Malaya, Kuala Lumpur 50603, Malaysia
| | - Saadah Abdul Rahman
- Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University Malaya, Kuala Lumpur 50603, Malaysia
| | - Poisim Khiew
- Center of Nanotechnology and Advanced Materials, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Yingchin Lim
- Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, 40450 Selangor, Malaysia
| | - Roslan Abd-Shukor
- School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - M. Azmi. Abd. Hamid
- School of Applied Physics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
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Tuning the Morphology and Properties of Nanostructured Cu-ZnO Thin Films Using a Two-Step Sputtering Technique. METALS 2020. [DOI: 10.3390/met10040437] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Zinc oxide (ZnO) is a wide-band-gap semiconductor that is promising for use as a transparent conductive oxide film. To date, to improve their optoelectrical properties, pristine ZnO films have been doped with metals using various techniques. In this study, nanostructured Cu-ZnO thin films were synthesized using a modified two-step radio frequency magnetron sputtering technique with separate ZnO and metallic Cu targets. Controlling the timing of the Cu/ZnO co-sputtering and ZnO-only sputtering steps afforded a significant change in the resulting nanostructures, such as uniform Cu-ZnO and broccoli-structured Cu-ZnO thin films. Using various measurement techniques, the influence of Cu doping was analyzed in detail. Furthermore, a crystal growth model for the formation of the broccoli-like clusters was suggested. The Cu-ZnO thin films synthesized using this technique demonstrate a highly improved conductivity with some loss in optical transmittance.
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Zhou Y, Wang J, Zhou H, Xiang F, Yang H, Cai X, Liao H, Gu L, Wang Y. An electrochemical approach towards the controllable synthesis of highly ordered and hierarchical zinc oxide dendritic crystals composed of hexagonal nanosheets: some insights into the stacking-assembly of the hierarchical architecture. CrystEngComm 2019. [DOI: 10.1039/c9ce00342h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Herein, an electrochemical synthetic approach is presented to produce a highly ordered and hierarchical zinc oxide dendrite architecture composed of hexagonal nanosheets.
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Affiliation(s)
- Yuli Zhou
- School of Materials Science and Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Jian Wang
- School of Materials Science and Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Hongting Zhou
- School of Mechanical Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Fangyu Xiang
- College of teacher education
- Ningbo University
- Ningbo 315000
- People's Republic of China
| | - Hongyu Yang
- School of Materials Science and Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Xiaoyao Cai
- School of Mechanical Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Huimin Liao
- School of Materials Science and Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Lin Gu
- School of Materials Science and Engineering
- Xihua University
- Chengdu 610039
- People's Republic of China
| | - Yanyan Wang
- School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology
- Soochow University
- Suzhou 215006
- People's Republic of China
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