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Lan YX, Chen YH, Chao YL, Chang YH, Huang YC, Liu WR, Wong WT, Sun ACF, Santiago KS, Yeh JM. Green and Heavy-Duty Anticorrosion Coatings: Waterborne Epoxy Thermoset Composites Modified through Variation of Zinc Dust Loading and Incorporation of Amine-Capped Aniline Trimer and Graphene Oxide. Polymers (Basel) 2024; 16:1252. [PMID: 38732721 PMCID: PMC11085474 DOI: 10.3390/polym16091252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/20/2024] [Accepted: 04/26/2024] [Indexed: 05/13/2024] Open
Abstract
In this study, an array of environmentally friendly and heavy-duty anticorrosion composite coatings were prepared. The synthesis involved amine-capped aniline trimer (ACAT) produced by an oxidative coupling reaction and graphene oxide (GO) prepared based on Hummer's method, and later, the waterborne epoxy thermoset composite (WETC) coatings were prepared by thermal ring-opening polymerization of EP 147w, a commercial waterborne epoxy resin, in the presence of ACAT and/or GO with zinc dust (ZD). A synergistic effect was observed by replacing a significant amount of the ZD loading in the WETC by simultaneously incorporating a small amount of ACAT and GO. The electrochemical corrosion measurements of the as-prepared WETC coatings indicated that incorporating 5% w/w ACAT or 0.5% w/w GO separately replaced approximately 30% w/w or 15% w/w of the ZD, respectively. Moreover, the WETC coatings containing 5% w/w ACAT and 0.5% w/w GO simultaneously were found to replace 45% w/w of the ZD. A salt spray test based on ASTM B-117 also showed a consistent trend with the electrochemical results. Incorporating small amounts of ACAT and GO in WETC coatings instead of ZD not only maintains the anticorrosion performance but also enhances adhesion and abrasion resistance, as demonstrated by the adhesion and abrasion tests.
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Affiliation(s)
- Yun-Xiang Lan
- Department of Chemistry, Center for Nanotechnology at Chung Yuan Christian University, Chung Li 32023, Taiwan, China; (Y.-X.L.); (Y.-H.C.); (Y.-L.C.); (Y.-H.C.); (Y.-C.H.)
| | - Yun-Hsuan Chen
- Department of Chemistry, Center for Nanotechnology at Chung Yuan Christian University, Chung Li 32023, Taiwan, China; (Y.-X.L.); (Y.-H.C.); (Y.-L.C.); (Y.-H.C.); (Y.-C.H.)
| | - Ying-Lung Chao
- Department of Chemistry, Center for Nanotechnology at Chung Yuan Christian University, Chung Li 32023, Taiwan, China; (Y.-X.L.); (Y.-H.C.); (Y.-L.C.); (Y.-H.C.); (Y.-C.H.)
| | - Yu-Hsuan Chang
- Department of Chemistry, Center for Nanotechnology at Chung Yuan Christian University, Chung Li 32023, Taiwan, China; (Y.-X.L.); (Y.-H.C.); (Y.-L.C.); (Y.-H.C.); (Y.-C.H.)
| | - Yu-Chi Huang
- Department of Chemistry, Center for Nanotechnology at Chung Yuan Christian University, Chung Li 32023, Taiwan, China; (Y.-X.L.); (Y.-H.C.); (Y.-L.C.); (Y.-H.C.); (Y.-C.H.)
| | - Wei-Ren Liu
- Department of Chemical Engineering, R&D Center for Membrane Technology, Center for Circular Economy, Chung Yuan Christian University, Taoyuan City 32023, Taiwan, China
| | - Wei-Tsan Wong
- Shiny Chemical Industrial Co., Ltd., Kaohsiung 82841, Taiwan, China; (W.-T.W.); (A.C.-F.S.)
| | - Andrew Chi-Fa Sun
- Shiny Chemical Industrial Co., Ltd., Kaohsiung 82841, Taiwan, China; (W.-T.W.); (A.C.-F.S.)
| | - Karen S. Santiago
- Department of Chemistry, College of Science, Research Center for the Natural and Applied Sciences, University of Santo Tomas, Manila 1015, Philippines;
| | - Jui-Ming Yeh
- Department of Chemistry, Center for Nanotechnology at Chung Yuan Christian University, Chung Li 32023, Taiwan, China; (Y.-X.L.); (Y.-H.C.); (Y.-L.C.); (Y.-H.C.); (Y.-C.H.)
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Bao Y, Fu W, Xu H, Chen Y, Zhang H, Chen S. Bioinspired self-cleaning surface with microflower-like structures constructed by electrochemically corrosion mediated self-assembly. CrystEngComm 2022. [DOI: 10.1039/d1ce01267c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Developing facile and low-cost methods for the fabrication of bioinspired self-cleaning surfaces is of significant importance but still very challenging. In this work, we present a simple facile and low-cost...
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Li S, Huang P, Ye Z, Wang Y, Wang W, Kong D, Zhang J, Deng L, Dong A. Layer-by-layer zwitterionic modification of diverse substrates with durable anti-corrosion and anti-fouling properties. J Mater Chem B 2020; 7:6024-6034. [PMID: 31545333 DOI: 10.1039/c9tb01337g] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A versatile coating strategy, which is suitable for the anti-corrosion and anti-fouling modification of chemically distinct substrates, is crucial in many industries. The immobilization of zwitterionic polymers onto the surface has been proven to be an excellent approach for the improvement of antibiofouling potency. However, the anti-corrosion property has not always been considered simultaneously. Herein, a layer-by-layer (LBL) zwitterionic surface modification strategy was proposed: the surface was first coated with a polydopamine (PDA) layer for anti-corrosion; then, by self-assembling a monolayer of 3-aminopropyl triethoxysilane (APTES), the anti-corrosion ability was further enhanced and the efficiency of grafting was improved; thereafter, by immobilizing the zwitterionic polysulfobetaine (PSB) polymer brush layer, the surface could effectively repel biofouling. The surface chemical composition and morphology characterization was performed by using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and water contact angle measurements, demonstrating that the modification was stepwise introduced onto the surface. The thickness of coating was observed and measured by SEM cross-sectional analysis. In vitro studies revealed that the PSB coated surfaces dramatically reduced the adhesion of bovine serum albumin (BSA), bovine plasma fibrinogen (Fg), bovine γ-globulin (γ-GL), the mixture of these proteins, fibroblasts, E. coli and S. aureus with superior cytocompatibility and hemocompatibility. Moreover, the electrochemical impedance spectroscopy and acidic corrosion studies indicated that an excellent and durable anti-corrosion property was established successfully on the surfaces of stainless steel, cotton textile and wood plates, confirming the feasibility of the LBL surface modification strategy. Significantly, this LBL surface chemistry may be widely applied for the modification of other materials, such as biosensors, biomedical implants and/or devices, and marine equipment.
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Affiliation(s)
- Shuangyang Li
- Department of Polymer Science and Technology, School of Chemical Engineering and Technology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China.
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4
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Xiang R, Tong C, Wang Y, Peng L, Nie Y, Li L, Huang X, Wei Z. Hierarchical coral-like FeNi(OH) /Ni via mild corrosion of nickel as an integrated electrode for efficient overall water splitting. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(18)63150-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Chen S, Li Y, Cheng YF. Nanopatterning of steel by one-step anodization for anti-adhesion of bacteria. Sci Rep 2017; 7:5326. [PMID: 28706204 PMCID: PMC5509660 DOI: 10.1038/s41598-017-05626-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/31/2017] [Indexed: 11/13/2022] Open
Abstract
Surface nanopatterning of metals has been an effective technique for improved performance and functionalization. However, it is of great challenge to fabricate nanostructure on carbon steels despite their extensive use and urgent needs to maintain the performance reliability and durability. Here, we report a one-step anodization technique to nanopattern a carbon steel in 50 wt.% NaOH solution for highly effective anti-adhesion by sulphate reducing bacteria (SRB), i.e., Desulfovibrio desulfuricans subsp. desulfuricans (Beijerinck) Kluyver and van Niel. We characterize the morphology, structure, composition, and surface roughness of the nanostructured film formed on the steel as a function of anodizing potential. We quantify the surface hydrophobicity by contact angle measurements, and the SRB adhesion by fluorescent analysis. The optimal anodization potential of 2.0 V is determined for the best performance of anti-adhesion of SRB to the steel, resulting in a 23.5 times of reduction of SRB adhesion compared to bare steel. We discuss the mechanisms for the film formation on the steel during anodization, and the high-performance anti-adhesion of bacteria to nanopatterned steels. Our technique is simple, cost-effective and environment-friendly, providing a promising alternative for industry-scale surface nanopatterning of carbon steels for effective controlling of bacterial adhesion.
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Affiliation(s)
- Shiqiang Chen
- Department of Mechanical & Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Yuan Li
- Department of Mechanical & Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Y Frank Cheng
- Department of Mechanical & Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada.
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Damian A, Maroun F, Allongue P. Electrochemical de-alloying in two dimensions: role of the local atomic environment. NANOSCALE 2016; 8:13985-13996. [PMID: 27121686 DOI: 10.1039/c6nr01390b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We investigate by in situ scanning tunnelling microscopy (STM) the potential dependence of the electrochemical dealloying of NiPd monoatomic layers electrodeposited on Au(111). The dealloying process is achieved by Ni selective dissolution and was studied as a function of NiPd composition: for an alloy with a Ni content ≥70%, quasi-complete Ni dissolution is achieved at a potential of -0.9 VMSE whereas for a Ni content <70%, Ni dissolution at the same potential drastically slows down after the removal of small amounts of Ni. The alloy morphology at this "passivation state" is characterized by the presence of holes in the alloy monolayer with evidence for the Pd enrichment at the hole edges. These findings are confirmed by Monte Carlo simulations. Further Ni dissolution at passivation was achieved by applying more positive potentials which depend on the alloy composition. These results allowed us to determine the correlation between the Ni dissolution onset potential and the local Pd content.
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Affiliation(s)
- A Damian
- Physique de la Matière Condensée, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
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Wang J, Tan CF, Zhu T, Ho GW. Topotactic Consolidation of Monocrystalline CoZn Hydroxides for Advanced Oxygen Evolution Electrodes. Angew Chem Int Ed Engl 2016; 55:10326-30. [DOI: 10.1002/anie.201605096] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 06/14/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Jing Wang
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
| | - Chuan Fu Tan
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
| | - Ting Zhu
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
| | - Ghim Wei Ho
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
- Engineering Science Programme; National University of Singapore; 9 Engineering Drive 1 Singapore 117575 Singapore
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research); 2 Fusionopolis Way Singapore 138634 Singapore
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Wang J, Tan CF, Zhu T, Ho GW. Topotactic Consolidation of Monocrystalline CoZn Hydroxides for Advanced Oxygen Evolution Electrodes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605096] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jing Wang
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
| | - Chuan Fu Tan
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
| | - Ting Zhu
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
| | - Ghim Wei Ho
- Department of Electrical and Computer Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583 Singapore
- Engineering Science Programme; National University of Singapore; 9 Engineering Drive 1 Singapore 117575 Singapore
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research); 2 Fusionopolis Way Singapore 138634 Singapore
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Wang J, Zhu T, Ho GW. Nature-Inspired Design of Artificial Solar-to-Fuel Conversion Systems based on Copper Phosphate Microflowers. CHEMSUSCHEM 2016; 9:1575-8. [PMID: 27225314 DOI: 10.1002/cssc.201600481] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Indexed: 05/26/2023]
Abstract
Phosphates play significant roles in plant photosynthesis by mediating electron transportation and furnishing energy for CO2 reduction. Motivated by this, we demonstrate herein an artificial solar-to-fuel conversion system, involving versatile copper phosphate microflowers as template and titanium dioxide nanoparticles as host photocatalyst. The elaborate flowerlike architectures, coupled with a unique proton-reduction cycle from interchangeability of different species of orthophosphate ions, not only offer a 2D nanosheet platform for an optimal heterostructure interface but also effectively augment charge-carrier transfer, thereby contributing to enhanced photoactivity and hydrogen generation. These nature-inspired, phosphate-derived nanocomposites advance the synthesis of a large variety of functional materials, which holds great potential for photochemical, photoelectric and catalytic applications.
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Affiliation(s)
- Jing Wang
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Ting Zhu
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Ghim Wei Ho
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
- Engineering Science Programme, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore.
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Singapore, 138634, Singapore.
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10
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Chauvin A, Delacôte C, Molina-Luna L, Duerrschnabel M, Boujtita M, Thiry D, Du K, Ding J, Choi CH, Tessier PY, El Mel AA. Planar Arrays of Nanoporous Gold Nanowires: When Electrochemical Dealloying Meets Nanopatterning. ACS APPLIED MATERIALS & INTERFACES 2016; 8:6611-6620. [PMID: 26926232 DOI: 10.1021/acsami.5b11244] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanoporous materials are of great interest for various technological applications including sensors based on surface-enhanced Raman scattering, catalysis, and biotechnology. Currently, tremendous efforts are dedicated to the development of porous one-dimensional materials to improve the properties of such class of materials. The main drawback of the synthesis approaches reported so far includes (i) the short length of the porous nanowires, which cannot reach the macroscopic scale, and (ii) the poor organization of the nanostructures obtained by the end of the synthesis process. In this work, we report for the first time on a two-step approach allowing creating highly ordered porous gold nanowire arrays with a length up to a few centimeters. This two-step approach consists of the growth of gold/copper alloy nanowires by magnetron cosputtering on a nanograted silicon substrate, serving as a physical template, followed by a selective dissolution of copper by an electrochemical anodic process in diluted sulfuric acid. We demonstrate that the pore size of the nanowires can be tailored between 6 and 21 nm by tuning the dealloying voltage between 0.2 and 0.4 V and the dealloying time within the range of 150-600 s. We further show that the initial gold content (11 to 26 atom %) and the diameter of the gold/copper alloy nanowires (135 to 250 nm) are two important parameters that must carefully be selected to precisely control the porosity of the material.
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Affiliation(s)
- Adrien Chauvin
- Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS , 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France
| | - Cyril Delacôte
- CEISAM, Université de Nantes, CNRS , 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France
| | - Leopoldo Molina-Luna
- Department of Material- and Geosciences, Technische Universität Darmstadt , Alarich-Weiss-Strasse 2, 64287 Darmstadt, Germany
| | - Michael Duerrschnabel
- Department of Material- and Geosciences, Technische Universität Darmstadt , Alarich-Weiss-Strasse 2, 64287 Darmstadt, Germany
| | - Mohammed Boujtita
- CEISAM, Université de Nantes, CNRS , 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France
| | - Damien Thiry
- Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS , 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France
| | - Ke Du
- Department of Mechanical Engineering, Stevens Institute of Technology , Hoboken, New Jersey 07030, United States
| | - Junjun Ding
- Department of Mechanical Engineering, Stevens Institute of Technology , Hoboken, New Jersey 07030, United States
| | - Chang-Hwan Choi
- Department of Mechanical Engineering, Stevens Institute of Technology , Hoboken, New Jersey 07030, United States
| | - Pierre-Yves Tessier
- Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS , 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France
| | - Abdel-Aziz El Mel
- Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS , 2 rue de la Houssinière B.P. 32229, 44322 Nantes cedex 3, France
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Wang J, Ho GW. Corrosion‐Mediated Self‐Assembly (CMSA): Direct Writing Towards Sculpturing of 3D Tunable Functional Nanostructures. Angew Chem Int Ed Engl 2015; 54:15804-8. [DOI: 10.1002/anie.201509356] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Jing Wang
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583 (Singapore)
| | - Ghim Wei Ho
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583 (Singapore)
- Engineering Science Programme, National University of Singapore, 9 Engineering Drive 1, Singapore 117575 (Singapore)
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602 (Singapore)
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12
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Corrosion‐Mediated Self‐Assembly (CMSA): Direct Writing Towards Sculpturing of 3D Tunable Functional Nanostructures. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509356] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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El Mel AA, Boukli-Hacene F, Molina-Luna L, Bouts N, Chauvin A, Thiry D, Gautron E, Gautier N, Tessier PY. Unusual dealloying effect in gold/copper alloy thin films: the role of defects and column boundaries in the formation of nanoporous gold. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2310-21. [PMID: 25562716 DOI: 10.1021/am5065816] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Understanding the dealloying mechanisms of gold-based alloy thin films resulting in the formation of nanoporous gold with a sponge-like structure is essential for the future design and integration of this novel class of material in practical devices. Here we report on the synthesis of nanoporous gold thin films using a free-corrosion approach in nitric acid applied to cosputtered Au-Cu thin films. A relationship is established between the as-grown Au-Cu film characteristics (i.e., composition, morphology, and structure) and the porosity of the sponge-like gold thin films. We further demonstrate that the dealloying approach can be applied to nonhomogenous Au-Cu alloy thin films consisting of periodic and alternate Au-rich/Au-poor nanolayers. In such a case, however, the dealloying process is found to be altered and unusual etching stages arise. Thanks to defects and column boundaries playing the role of channels, the nitric acid is found to quickly penetrate within the films and then laterally (i.e., parallel to the film surface) attacks the nanolayers rather than perpendicularly. As a consequence to this anisotropic etching, the Au-poor layers are etched preferentially and transform into Au pillars holding the Au-rich layers and preventing them against collapsing. A further exposure to nitric acid results in the collapsing of the Au-rich layers accompanied by a transition from a multilayered to a sponge-like structure. A scenario, supported by experimental observations, is further proposed to provide a detailed explanation of the fundamental mechanisms occurring during the dealloying process of films with a multilayered structure.
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Affiliation(s)
- Abdel-Aziz El Mel
- Institut des Matériaux Jean Rouxel, IMN, Université de Nantes, CNRS , 2 rue de la Houssinière, B.P. 32229, 44322 Nantes cedex 3, France
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14
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Mujtaba J, Sun H, Fang F, Ahmad M, Zhu J. Fine control over the morphology and photocatalytic activity of 3D ZnO hierarchical nanostructures: capping vs. etching. RSC Adv 2015. [DOI: 10.1039/c5ra08325g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
ZnO 3D hierarchical structures with different morphologies can be selectively synthesized at room temperature by using potassium hydroxide and citric acid as an etchant and capping agent, respectively.
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Affiliation(s)
- Jawayria Mujtaba
- Beijing National Center for Electron Microscopy
- School of Materials Science and Engineering
- The State Key Laboratory of New Ceramics and Fine Processing
- Key Laboratory of Advanced Materials (MOE)
- Tsinghua University
| | - Hongyu Sun
- Beijing National Center for Electron Microscopy
- School of Materials Science and Engineering
- The State Key Laboratory of New Ceramics and Fine Processing
- Key Laboratory of Advanced Materials (MOE)
- Tsinghua University
| | - Fang Fang
- Beijing National Center for Electron Microscopy
- School of Materials Science and Engineering
- The State Key Laboratory of New Ceramics and Fine Processing
- Key Laboratory of Advanced Materials (MOE)
- Tsinghua University
| | - Mashkoor Ahmad
- Nanomaterials Research Group
- Physics Division
- Pakistan Institute of Nuclear Science and Technology
- Islamabad 44000
- Pakistan
| | - Jing Zhu
- Beijing National Center for Electron Microscopy
- School of Materials Science and Engineering
- The State Key Laboratory of New Ceramics and Fine Processing
- Key Laboratory of Advanced Materials (MOE)
- Tsinghua University
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15
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Iqbal D, Kostka A, Bashir A, Sarfraz A, Chen Y, Wieck AD, Erbe A. Sequential growth of zinc oxide nanorod arrays at room temperature via a corrosion process: application in visible light photocatalysis. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18728-34. [PMID: 25278370 DOI: 10.1021/am504299v] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Many photocatalyst systems catalyze chemical reactions under ultraviolet (UV) illumination, because of its high photon energies. Activating inexpensive, widely available materials as photocatalyst using the intense visible part of the solar spectrum is more challenging. Here, nanorod arrays of the wide-band-gap semiconductor zinc oxide have been shown to act as photocatalysts for the aerobic photo-oxidation of organic dye Methyl Orange under illumination with red light, which is normally accessible only to narrow-band semiconductors. The homogeneous, 800-1000-nm-thick ZnO nanorod arrays show substantial light absorption (absorbances >1) throughout the visible spectral range. This absorption is caused by defect levels inside the band gap. Multiple scattering processes by the rods make the nanorods appear black. The dominantly crystalline ZnO nanorod structures grow in the (0001) direction, i.e., with the c-axis perpendicular to the surface of polycrystalline zinc. The room-temperature preparation route relies on controlled cathodic delamination of a weakly bound polymer coating from metallic zinc, an industrially produced and cheaply available substrate. Cathodic delamination is a sequential synthesis process, because it involves the propagation of a delamination front over the base material. Consequently, arbitrarily large sample surfaces can be nanostructured using this approach.
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Affiliation(s)
- Danish Iqbal
- Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , 44801 Bochum, Germany
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16
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Ma A, Xu J, Zhang X, Zhang B, Wang D, Xu H. Interfacial nanodroplets guided construction of hierarchical Au, Au-Pt, and Au-Pd particles as excellent catalysts. Sci Rep 2014; 4:4849. [PMID: 24797697 PMCID: PMC4010925 DOI: 10.1038/srep04849] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 04/14/2014] [Indexed: 12/01/2022] Open
Abstract
Interfacial nanodroplets were grafted to the surfaces of self-sacrificed template particles in a galvanic reaction system to assist the construction of 3D Au porous structures. The interfacial nanodroplets were formed via direct adsorption of surfactant-free emulsions onto the particle surfaces. The interfacial nanodroplets discretely distributed at the template particle surfaces and served as soft templates to guide the formation of porous Au structures. The self-variation of footprint sizes of interfacial nanodroplets during Au growth gave rise to a hierarchical pore size distribution of the obtained Au porous particles. This strategy could be easily extended to synthesize bimetal porous particles such as Au-Pt and Au-Pd. The obtained porous Au, Au-Pt, and Au-Pd particles showed excellent catalytic activity in catalytic reduction of 4-nitrophenol.
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Affiliation(s)
- Aijing Ma
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, SA 5095, Australia
| | - Jie Xu
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, SA 5095, Australia
| | - Xuehua Zhang
- 1] Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville VIC 3010, Australia [2] School of Chemistry, University of Melbourne, Parkville, VIC 3010, Australia
| | - Bin Zhang
- Department of Chemistry, Tianjin University, Tianjin, China
| | - Dayang Wang
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, SA 5095, Australia
| | - Haolan Xu
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, SA 5095, Australia
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