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Shao L, Moehl GE, Huang R, Hector AL. Fractal-like gold nanonetworks formed by templated electrodeposition through 3D-mesoporous silica films. RSC Adv 2023; 13:32660-32671. [PMID: 37936637 PMCID: PMC10626528 DOI: 10.1039/d3ra06588j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 10/30/2023] [Indexed: 11/09/2023] Open
Abstract
Fractal-like networks of gold nanoparticles created by templated electrodeposition are described. Templated electrodeposition is a powerful and efficient technique for the bottom-up fabrication of nanostructures which can effectively control the size and shape of the electrodeposits. In this work, mesoporous silica films with highly ordered mesopores and three-dimensional mesostructure are synthesised and are used as templates for the electrodeposition of gold nanoparticles. The mesoporous silica films have small mesopores (∼8 nm) and complex mesopore channels (Fmmm structure with the [0 1 0] axis perpendicular to the substrate). A variety of nucleation conditions were applied to investigate their effect on the nanoparticles' arrangement and growth in templated electrodeposition. The electrodeposited gold particles are characterised by electron microscopy and grazing incidence small-angle X-ray scattering (GISAXS). GISAXS shows changes in the lattice parameters of the mesostructure after gold electrodeposition that relate to dimensional changes in directions linked to the shortest distances between the main spherical pores. Top-view SEM shows large areas of gold nanoparticles were deposited into the film and they were growing towards the surface. After removing the silica film templates, the gold nanoparticles display interesting fractal morphologies: the linked gold nanonetworks form a branched structure. The lengths of branches vary from the applied nucleation deposition conditions. Generally, with increasing nucleation time, fractal gold nanoparticles with longer branches are more likely to be obtained.
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Affiliation(s)
- Li Shao
- School of Chemistry, University of Southampton, Highfield Southampton SO17 1BJ UK
| | - Gilles E Moehl
- School of Chemistry, University of Southampton, Highfield Southampton SO17 1BJ UK
| | - Ruomeng Huang
- School of Electronics and Computer Science, University of Southampton Southampton SO17 1BJ UK
| | - Andrew L Hector
- School of Chemistry, University of Southampton, Highfield Southampton SO17 1BJ UK
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2
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Kumari R, Dkhar DS, Mahapatra S, Divya, Singh SP, Chandra P. Nano-Engineered Surface Comprising Metallic Dendrites for Biomolecular Analysis in Clinical Perspective. BIOSENSORS 2022; 12:1062. [PMID: 36551029 PMCID: PMC9775260 DOI: 10.3390/bios12121062] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/19/2022] [Accepted: 11/20/2022] [Indexed: 09/28/2023]
Abstract
Metallic dendrites, a class of three-dimensional nanostructured materials, have drawn a lot of interests in the recent years because of their interesting hierarchical structures and distinctive features. They are a hierarchical self-assembled array of primary, secondary, and terminal branches with a plethora of pointed ends, ridges, and edges. These features provide them with larger active surface areas. Due to their enormous active areas, the catalytic activity and conductivity of these nanostructures are higher as compared to other nanomaterials; therefore, they are increasingly used in the fabrication of sensors. This review begins with the properties and various synthetic approaches of nanodendrites. The primary goal of this review is to summarize various nanodendrites-engineered biosensors for monitoring of small molecules, macromolecules, metal ions, and cells in a wide variety of real matrices. Finally, to enlighten future research, the limitations and future potential of these newly discovered materials are discussed.
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Affiliation(s)
- Rohini Kumari
- Laboratory of Bio-Physio Sensors and Nanobioengineering, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Daphika S. Dkhar
- Laboratory of Bio-Physio Sensors and Nanobioengineering, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Supratim Mahapatra
- Laboratory of Bio-Physio Sensors and Nanobioengineering, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Divya
- Laboratory of Bio-Physio Sensors and Nanobioengineering, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Surinder P. Singh
- CSIR—National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pranjal Chandra
- Laboratory of Bio-Physio Sensors and Nanobioengineering, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
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3
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Martins TS, Bott-Neto JL, Machado SAS, Oliveira ON. Label-Free Electrochemical Immunosensor Made with Tree-like Gold Dendrites for Monitoring 25-Hydroxyvitamin D3 Metabolite. ACS APPLIED MATERIALS & INTERFACES 2022; 14:31455-31462. [PMID: 35776164 DOI: 10.1021/acsami.2c08381] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Flexible, fully printed immunosensors can meet the requirements of precision nutrition, but this demands optimized molecular architectures to reach the necessary sensitivity. Herein, we report on flexible and label-free immunosensor chips made with tree-like gold dendrites (AuDdrites) electrochemically formed by selective desorption of l-cysteine (L-cys) on (111) gold planes. Electrodeposition was used because it is scalable and cost-effective for a rapid, direct growth of Au hyperbranched dendritic structures. The 25-hydroxyvitamin D3 (25(OH)D3) metabolite was detected within 15 min with a limit of detection (LOD) of 0.03 ng mL-1. This high performance was possible due to the careful optimization of the electroactive layer and working conditions for square wave voltammetry (SWV). Electrocrystallization was manipulated by controlling the deposition potential and the molar ratio between HAuCl4 and L-cys. Metabolite detection was performed on human serum and saliva samples with adequate recovery between 97% and 100%. The immunosensors were stable and reproducible, unresponsive to interference from other molecules in human serum and saliva. They can be extended for use as wearable sensors with their mechanical flexibility and possible customization.
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Affiliation(s)
- Thiago S Martins
- São Carlos Institute of Chemistry, University of São Paulo, 13560-970 São Carlos, SP, Brazil
| | - José L Bott-Neto
- São Carlos Institute of Physics, University of São Paulo, 13560-970 São Carlos, SP, Brazil
| | - Sergio A S Machado
- São Carlos Institute of Chemistry, University of São Paulo, 13560-970 São Carlos, SP, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo, 13560-970 São Carlos, SP, Brazil
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4
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Electrochemically co-deposited silicate sol–gel/PdAu alloy nanostructures and their application in electrocatalytic methanol oxidation. J CHEM SCI 2022. [DOI: 10.1007/s12039-022-02044-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Kwon T, Mun HY, Seo S, Yu A, Lee C, Lee Y. Amperometric Sensing of Carbon Monoxide: Improved Sensitivity and Selectivity via Nanostructure-Controlled Electrodeposition of Gold. BIOSENSORS 2021; 11:334. [PMID: 34562925 PMCID: PMC8468895 DOI: 10.3390/bios11090334] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/09/2021] [Accepted: 09/10/2021] [Indexed: 01/04/2023]
Abstract
A series of gold (Au) nanostructures, having different morphologies, were fabricated for amperometric selective detection of carbon monoxide (CO), a biologically important signaling molecule. Au layers were electrodeposited from a precursor solution of 7 mM HAuCl4 with a constant deposition charge (0.04 C) at various deposition potentials. The obtained Au nanostructures became rougher and spikier as the deposition potential lowered from 0.45 V to 0.05 V (vs. Ag/AgCl). As prepared Au layers showed different hydrophobicity: The sharper morphology, the greater hydrophobicity. The Au deposit formed at 0.05 V had the sharpest shape and the greatest surface hydrophobicity. The sensitivity of an Au deposit for amperometric CO sensing was enhanced as the Au surface exhibits higher hydrophobicity. In fact, CO selectivity over common electroactive biological interferents (L-ascorbic acid, 4-acetamidophenol, 4-aminobutyric acid and nitrite) was improved eminently once the Au deposit became more hydrophobic. The most hydrophobic Au was also confirmed to sense CO exclusively without responding to nitric oxide, another similar gas signaling molecule, in contrast to a hydrophobic platinum (Pt) counterpart. This study presents a feasible strategy to enhance the sensitivity and selectivity for amperometric CO sensing via the fine control of Au electrode nanostructures.
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Affiliation(s)
| | | | | | | | | | - Youngmi Lee
- Department of Chemistry & Nanoscience, Ewha Womans University, Seoul 03760, Korea; (T.K.); (H.Y.M.); (S.S.); (A.Y.); (C.L.)
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Manoj D, Shanmugasundaram S, Anandharamakrishnan C. Nanosensing and nanobiosensing: Concepts, methods, and applications for quality evaluation of liquid foods. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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7
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Glucose Biosensor Based on Dendritic Gold Nanostructures Electrodeposited on Graphite Electrode by Different Electrochemical Methods. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9080188] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this research, we have demonstrated a one-step electrochemical deposition of dendritic gold nanostructures (DGNs) on a graphite rod (GR) electrode without any template, seeds, surfactants, or stabilizers. Three electrochemical methods, namely, constant potential amperometry (CPA), pulse amperometry, and differential pulse voltammetry, were used for DGN synthesis on GR electrode and further application in enzymatic glucose biosensors. Formed gold nanostructures, including DGNs, were characterized by a field emission scanning electron microscopy. The optimal concentration of HAuCl4 (6.0 mmol L−1), duration of DGNs synthesis (400 s), electrodeposition potential (−0.4 V), and the best electrochemical method (CPA) were determined experimentally. Then the enzyme, glucose oxidase, was adsorbed on the surface of DGNs and covalently cross-linked with glutaraldehyde vapor. The enzymatic glucose biosensor based on DGNs electrodeposited at optimal conditions and modified with glucose oxidase showed a quick response (less than 3 s), a high saturation current (291 μA), appropriate linear range (up to 9.97 mmol L−1 of glucose, R2 = 0.9994), good repeatability (RSD 2.4, 2.2 and 1.5% for 2, 30, 97 mmol L−1 of glucose), low limit of detection (0.059 mmol L−1, S/N = 3) and good stability. Additionally, this biosensor could be successfully applied for glucose determination in real samples with good accuracy. These results proved the principle of enzymatic glucose biosensor development based on DGNs as the basis for further investigations.
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Wang K, Chen Y, Dou X, Han Y. The role of interface concentration gradient in the formation of silver dendritic particles. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.03.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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9
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Kazi AP, Routsi AM, Kaur B, Christodouleas DC. Inexpensive, Three-Dimensional, Open-Cell, Fluid-Permeable, Noble-Metal Electrodes for Electroanalysis and Electrocatalysis. ACS APPLIED MATERIALS & INTERFACES 2020; 12:45582-45589. [PMID: 32926774 DOI: 10.1021/acsami.0c13303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This study describes the fabrication of three-dimensional, open-cell, noble-metal (Au, Ag, and Pt) electrodes that have a complex geometry, i.e., wire mesh, metallic foam, "origami" wire mesh, and helix wire mesh. The electrodes were fabricated using an ultrasonication-assisted electroplating method that deposits a thin, continuous, and defect-free layer of noble metal (i.e., Au, Ag, or Pt) on an inexpensive copper substrate that has the desired geometry. The method is inexpensive, easy to use, and capable of fabricating noble-metal electrodes of complex geometries that cannot be fabricated using established techniques like screen printing or physical vapor deposition. By minimizing the amount of the pure noble metal in the electrodes, their cost drops significantly and could become low enough even for single-use applications; for example, the cost of metal in a Au wire-mesh electrode is $0.007/cm2 of exposed area that is about 400 times lower than that of a wire-mesh electrode composed entirely of Au. The electrodes exhibit an almost identical electrochemical performance to noble-metal electrodes of similar shape composed of bulk noble metal; therefore, these electrodes could replace two-dimensional noble-metal electrodes (e.g., rods, disks, foils) in numerous electroanalytical and electrocatalytical systems or even allow the use of noble-metal electrodes in new applications such as flow-based electrochemical systems. In this study, wire-mesh and metallic foam noble-metal electrodes have been successfully used as working electrodes for the electrocatalytical oxidation of methanol and for the electrochemical detection of redox mediators, lead ions, and nitrobenzene using various electroanalytical techniques.
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Affiliation(s)
- Abbas Parvez Kazi
- Department of Chemistry, University of Massachusetts-Lowell, Lowell, Massachusetts 01854, United States
| | - Anna Maria Routsi
- Department of Chemistry, University of Massachusetts-Lowell, Lowell, Massachusetts 01854, United States
| | - Balwinder Kaur
- Department of Chemistry, University of Massachusetts-Lowell, Lowell, Massachusetts 01854, United States
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Bauer P, Mougin K, Faye D, Buch A, Ponthiaux P, Vignal V. Synthesis of 3D Dendritic Gold Nanostructures Assisted by a Templated Growth Process: Application to the Detection of Traces of Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11015-11027. [PMID: 32867476 DOI: 10.1021/acs.langmuir.0c01857] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Complex architectures like 3D gold dendritic nanostructures were synthesized by an in situ templated growth method using a thin film of a block copolymer [polystyrene-b-poly(4-vinylpyridine)] deposited onto silicon substrates. The overall study has demonstrated the strong link between the morphology, size, and distribution of the structures and the synthetic physicochemical parameters, such as pH, reaction temperature, concentration, and nature of reactants. A nonequilibirum state of the medium has been required to create a fractal growth of the gold structures onto a prepatterned gold-seeded surface and has led to a better control of the structures' surface coverage rate. Those as-prepared nanodendrites have also exhibited high electrocatalytic activity toward a significant enhancement factor, as well as important sensitivity, thanks to tip effects. The electrochemical experiment results have demonstrated efficient adsorption and quantification of very low traces of specific molecules like glutathione or hexadecanethiol.
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Affiliation(s)
- Pierre Bauer
- Université Grenoble Alpes, Institut Neel, CNRS/UGA UPR2940, 25 Avenue des Martyrs, 38042 Grenoble, France
| | - Karine Mougin
- Université de Strasbourg, Université de Haute Alsace, Institut de Science des Matériaux, IS2M-CNRS-UMR 7361, 15 Rue Jean Starcky, 68057 Mulhouse, France
| | - Delphine Faye
- Centre Nationale d'Etudes Spatiales, 18 Avenue Édouard Belin, 31400 Toulouse, France
| | - Arnaud Buch
- Laboratoire LGPM-CentraleSupelec, 3 Rue Joliot-Curie, 91190 Gif-sur-Yvette, France
| | - Pierre Ponthiaux
- Laboratoire LGPM-CentraleSupelec, 3 Rue Joliot-Curie, 91190 Gif-sur-Yvette, France
| | - Vincent Vignal
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21078 Dijon, France
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Jalali M, Filine E, Dalfen S, Mahshid S. Microscale reactor embedded with Graphene/hierarchical gold nanostructures for electrochemical sensing: application to the determination of dopamine. Mikrochim Acta 2020; 187:90. [DOI: 10.1007/s00604-019-4059-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 11/30/2019] [Indexed: 01/31/2023]
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12
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Non-enzymatic flexible glucose sensing platform based on nanostructured TiO2 – Au composite. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.02.040] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Abstract
The development of biosensors for a range of analytes from small molecules to proteins to oligonucleotides is an intensely active field. Detection methods based on electrochemistry or on localized surface plasmon responses have advanced through using nanostructured electrodes prepared by electrodeposition, which is capable of preparing a wide range of different structures. Supported nanoparticles can be prepared by electrodeposition through applying fixed potentials, cycling potentials, and fixed current methods. Nanoparticle sizes, shapes, and surface densities can be controlled, and regular structures can be prepared by electrodeposition through templates. The incorporation of multiple nanomaterials into composite films can take advantage of the superior and potentially synergistic properties of each component. Nanostructured electrodes can provide supports for enzymes, antibodies, or oligonucleotides for creating sensors against many targets in areas such as genomic analysis, the detection of protein antigens, or the detection of small molecule metabolites. Detection can also be performed using electrochemical methods, and the nanostructured electrodes can greatly enhance electrochemical responses by carefully designed schemes. Biosensors based on electrodeposited nanostructures can contribute to the advancement of many goals in bioanalytical and clinical chemistry.
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Cheng R, Chung CC, Zhang H, Zhou Z, Zhai P, Huang YT, Lee H, Feng SP. An Air Knife-Assisted Recrystallization Method for Ambient-Process Planar Perovskite Solar Cells and Its Dim-Light Harvesting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804465. [PMID: 30690887 DOI: 10.1002/smll.201804465] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/28/2018] [Indexed: 06/09/2023]
Abstract
The photovoltaic performance of perovskite solar cells is highly dependent on the control of morphology and crystallization of perovskite film, which usually requires a controlled atmosphere. Therefore, fully ambient fabrication is a desired technology for the development of perovskite solar cells toward real production. Here, an air-knife assisted recrystallization method is reported, based on a simple bath-immersion to prepare high-quality perovskite absorbers. The resulted film shows a strong crystallinity with pure domains and low trap-state density, which contribute to the device performance and stability. The proposed method can operate in a wide process window, such as variable relative humidity and bath-immersion conditions, demonstrating a power conversion efficiency over 19% and 27% under 1 sun and 500-2000 lux dim-light illumination respectively, which is among the highest performance of ambient-process perovskite solar cells.
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Affiliation(s)
- Rui Cheng
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Chih-Chun Chung
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Hong Zhang
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Zhiwen Zhou
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Peng Zhai
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
- MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Yu-Ting Huang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Hyeonseok Lee
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Shien-Ping Feng
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
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15
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Swetha P, Feng SP. High-index facet defined shape-controlled electrochemical synthesis of nanocrystals: A mini review. Electrochem commun 2018. [DOI: 10.1016/j.elecom.2018.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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16
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Barman SC, Hossain MF, Park JY. Soft surfactant-assisted uniformly dispersed platinum nanoparticles for high performance electrochemical non-enzymatic glucose sensing platform. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.07.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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17
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Han L, Hao YN, Wei X, Chen XW, Shu Y, Wang JH. Hollow Copper Sulfide Nanosphere–Doxorubicin/Graphene Oxide Core–Shell Nanocomposite for Photothermo-chemotherapy. ACS Biomater Sci Eng 2017; 3:3230-3235. [DOI: 10.1021/acsbiomaterials.7b00643] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lu Han
- Research Center for Analytical
Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110189, China
| | - Ya-Nan Hao
- Research Center for Analytical
Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110189, China
| | - Xing Wei
- Research Center for Analytical
Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110189, China
| | - Xu-Wei Chen
- Research Center for Analytical
Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110189, China
| | - Yang Shu
- Research Center for Analytical
Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110189, China
| | - Jian-Hua Wang
- Research Center for Analytical
Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110189, China
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Liu C, Chang YH, Chen J, Feng SP. Electrochemical Synthesis of Cu 2O Concave Octahedrons with High-Index Facets and Enhanced Photoelectrochemical Activity. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39027-39033. [PMID: 29039198 DOI: 10.1021/acsami.7b12076] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
High-index-faceted nano-/microcrystals exhibit enhanced catalytic activity and can thus serve as new-generation catalysts owing to their high density of low-coordinated atoms, leading to significantly enhanced catalytic activity. In this study, an effective electrochemical approach termed cyclic scanning electrodeposition (CSE) was developed to convert a thin Cu film into Cu2O concave octahedrons enclosed by 24 {344} high-index facets at room temperature with high yield and high throughput. The formation mechanism and the role of each ion in the electrolyte were systematically studied, which facilitated the design of a high-index-faceted metal/metal oxide through CSE. We also presented a general formula to identify the structure of an individual crystal enclosed by {khh} high-index facets based on the crystals oriented along three low-index zone axes and imaged by transmission electron microscopy. Experimental results demonstrated the Cu2O concave octahedrons to be highly efficient, cost-effective catalysts for photoelectrochemical hydrogen production. This new technology is a promising route for the synthesis of metal or metal oxide crystals with high activity and has a great potential for several advanced applications, such as clean energy conversion.
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Affiliation(s)
- Chang Liu
- Department of Mechanical Engineering, The University of Hong Kong , Pokfulam Rd., Pokfulam 999077, Hong Kong
| | - Ya-Huei Chang
- Department of Mechanical Engineering, The University of Hong Kong , Pokfulam Rd., Pokfulam 999077, Hong Kong
| | - Jianan Chen
- Department of Mechanical Engineering, The University of Hong Kong , Pokfulam Rd., Pokfulam 999077, Hong Kong
| | - Shien-Ping Feng
- Department of Mechanical Engineering, The University of Hong Kong , Pokfulam Rd., Pokfulam 999077, Hong Kong
- HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI) , Hangzhou, Zhejiang 311300, China
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