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Verma S, Pathak AK, Rahman BMA. Review of Biosensors Based on Plasmonic-Enhanced Processes in the Metallic and Meta-Material-Supported Nanostructures. MICROMACHINES 2024; 15:502. [PMID: 38675314 PMCID: PMC11052336 DOI: 10.3390/mi15040502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/25/2024] [Accepted: 03/26/2024] [Indexed: 04/28/2024]
Abstract
Surface plasmons, continuous and cumulative electron vibrations confined to metal-dielectric interfaces, play a pivotal role in aggregating optical fields and energies on nanostructures. This confinement exploits the intrinsic subwavelength nature of their spatial profile, significantly enhancing light-matter interactions. Metals, semiconductors, and 2D materials exhibit plasmonic resonances at diverse wavelengths, spanning from ultraviolet (UV) to far infrared, dictated by their unique properties and structures. Surface plasmons offer a platform for various light-matter interaction mechanisms, capitalizing on the orders-of-magnitude enhancement of the electromagnetic field within plasmonic structures. This enhancement has been substantiated through theoretical, computational, and experimental studies. In this comprehensive review, we delve into the plasmon-enhanced processes on metallic and metamaterial-based sensors, considering factors such as geometrical influences, resonating wavelengths, chemical properties, and computational methods. Our exploration extends to practical applications, encompassing localized surface plasmon resonance (LSPR)-based planar waveguides, polymer-based biochip sensors, and LSPR-based fiber sensors. Ultimately, we aim to provide insights and guidelines for the development of next-generation, high-performance plasmonic technological devices.
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Affiliation(s)
- Sneha Verma
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
| | - Akhilesh Kumar Pathak
- Center for Smart Structures and Materials, Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA;
| | - B. M. Azizur Rahman
- School of Science and Technology, City University of London, London EC1V0HB, UK
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Patarroyo J, Bastús NG, Puntes V. Sculpting Windows onto AuAg Hollow Cubic Nanocrystals. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2590. [PMID: 37764620 PMCID: PMC10538185 DOI: 10.3390/nano13182590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023]
Abstract
Using surfactants in the galvanic replacement reaction (GRR) offers a versatile approach to modulating hollow metal nanocrystal (NC) morphology and composition. Among the various surfactants available, quaternary ammonium cationic surfactants are commonly utilised. However, understanding how they precisely influence morphological features, such as the size and void distribution, is still limited. In this study, we aim to uncover how adding different surfactants-CTAB, CTAC, CTApTS, and PVP-can fine-tune the morphological characteristics of AuAg hollow NCs synthesised via GRR at room temperature. Our findings reveal that the halide counterion in the surfactant significantly controls void formation within the hollow structure. When halogenated surfactants, such as CTAB or CTAC, are employed, multichambered opened nanoboxes are formed. In contrast, with non-halogenated CTApTS, single-walled closed nanoboxes with irregularly thick walls form. Furthermore, when PVP, a polymer surfactant, is utilised, changes in concentration lead to the production of well-defined single-walled closed nanoboxes. These observations highlight the role of surfactants in tailoring the morphology of hollow NCs synthesised through GRR.
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Affiliation(s)
- Javier Patarroyo
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC, The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain;
| | - Neus G. Bastús
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC, The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain;
- CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, 28029 Madrid, Spain
| | - Victor Puntes
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC, The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain;
- CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, 28029 Madrid, Spain
- Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
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Zozulya G, Kuntyi O, Mnykh R, Kytsya A, Bazylyak L. Synthesis of silver nanoparticles by sonogalvanic replacement on aluminium powder in sodium polyacrylate solutions. ULTRASONICS SONOCHEMISTRY 2022; 84:105951. [PMID: 35190350 PMCID: PMC8861451 DOI: 10.1016/j.ultsonch.2022.105951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/03/2022] [Accepted: 02/05/2022] [Indexed: 06/14/2023]
Abstract
The process of the formation of silver nanoparticles (AgNPs) via the method of galvanic replacement (GR) of Ag+ with aluminum powder in sodium polyacrylate (NaPA) solutions in the ultrasonic (US) field has been studied. It was observed, that the yellow colloidal solutions of stabilized AgNPs with the absorption maximum at ∼ 410 nm were obtained under the application of US power by 20 W and frequency by 20 kHz in the wide range of AgNO3 and NaPA concentrations (0.1 - 0.5 mM and 0.5 - 5.0 g/L respectively) at 25 0C. It was shown, that the GR process under US field occurs without of the significant induction period. Using the UV-vis spectroscopy the kinetics of AgNPs formation has been studied and it was observed the first order kinetics with respect to Ag+ ions both for the nucleation and growth processes. It was found that observable rate constants of nucleation are close for the all experimental conditions but the observable rate constants of growth decreased with increasing of initial concentration of AgNO3. Based on the obtained kinetic data it was proposed a mechanism of the formation of AgNPs consisted of the following two main stages: 1) the nucleation with the formation of primary nanoclusters (AgNCs) on aluminum surface followed by their ablation from the surface of the sacrificial metal by ultrasound into bulk of solution; 2) the transformation of AgNCs in AgNPs via growth from the Al surface and / or agglomeration of AgNCs. Using TEM it was found that the size of obtained AgNPs does not exceed of 25 nm and slightly depends on the initial concentrations of precursors. High antimicrobial activity of obtained colloidal solutions against gram-negative and gram-positive bacteria as well as against fungi was observed.
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Affiliation(s)
- Galyna Zozulya
- Department of Chemistry and Technology of Inorganic Substances, Lviv Polytechnic National University, 12 Bandery Str., 79013 Lviv, Ukraine
| | - Orest Kuntyi
- Department of Chemistry and Technology of Inorganic Substances, Lviv Polytechnic National University, 12 Bandery Str., 79013 Lviv, Ukraine
| | - Roman Mnykh
- Department of Chemistry and Technology of Inorganic Substances, Lviv Polytechnic National University, 12 Bandery Str., 79013 Lviv, Ukraine
| | - Andriy Kytsya
- Department of Physical Chemistry of Fossil Fuels of the Institute of Physical-Organic Chemistry and Coal Chemistry named after L. M. Lytvynenko of the National Academy of Sciences of Ukraine, 3a Naukova Str., 79060 Lviv, Ukraine.
| | - Liliya Bazylyak
- Department of Physical Chemistry of Fossil Fuels of the Institute of Physical-Organic Chemistry and Coal Chemistry named after L. M. Lytvynenko of the National Academy of Sciences of Ukraine, 3a Naukova Str., 79060 Lviv, Ukraine
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4
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Rahman BMA, Viphavakit C, Chitaree R, Ghosh S, Pathak AK, Verma S, Sakda N. Optical Fiber, Nanomaterial, and THz-Metasurface-Mediated Nano-Biosensors: A Review. BIOSENSORS 2022; 12:bios12010042. [PMID: 35049670 PMCID: PMC8773603 DOI: 10.3390/bios12010042] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 01/03/2022] [Accepted: 01/10/2022] [Indexed: 05/22/2023]
Abstract
The increasing use of nanomaterials and scalable, high-yield nanofabrication process are revolutionizing the development of novel biosensors. Over the past decades, researches on nanotechnology-mediated biosensing have been on the forefront due to their potential application in healthcare, pharmaceutical, cell diagnosis, drug delivery, and water and air quality monitoring. The advancement of nanoscale science relies on a better understanding of theory, manufacturing and fabrication practices, and the application specific methods. The topology and tunable properties of nanoparticles, a part of nanoscale science, can be changed by different manufacturing processes, which separate them from their bulk counterparts. In the recent past, different nanostructures, such as nanosphere, nanorods, nanofiber, core-shell nanoparticles, nanotubes, and thin films, have been exploited to enhance the detectability of labelled or label-free biological molecules with a high accuracy. Furthermore, these engineered-materials-associated transducing devices, e.g., optical waveguides and metasurface-based scattering media, widened the horizon of biosensors over a broad wavelength range from deep-ultraviolet to far-infrared. This review provides a comprehensive overview of the major scientific achievements in nano-biosensors based on optical fiber, nanomaterials and terahertz-domain metasurface-based refractometric, labelled and label-free nano-biosensors.
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Affiliation(s)
- B. M. Azizur Rahman
- School of Mathematics, Computer Science and Engineering, University of London, London EC1V 0HB, UK; (S.V.); (N.S.)
- Correspondence:
| | - Charusluk Viphavakit
- International School of Engineering and Intelligent Control Automation of Process Systems Research Unit, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand; (C.V.); (A.K.P.)
| | - Ratchapak Chitaree
- Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand;
| | - Souvik Ghosh
- Department of Electronic and Electrical Engineering, University College London, Gower St., London WC1E 6AE, UK;
| | - Akhilesh Kumar Pathak
- International School of Engineering and Intelligent Control Automation of Process Systems Research Unit, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand; (C.V.); (A.K.P.)
| | - Sneha Verma
- School of Mathematics, Computer Science and Engineering, University of London, London EC1V 0HB, UK; (S.V.); (N.S.)
| | - Natsima Sakda
- School of Mathematics, Computer Science and Engineering, University of London, London EC1V 0HB, UK; (S.V.); (N.S.)
- Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand;
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Zozulya G, Kuntyi O, Mnykh R, Sozanskyi M. Synthesis of Antibacterially ActiveSilver Nanoparticles by Galvanic Replacement on Magnesium in Solutions of Sodium Polyacrylate in an Ultrasound. CHEMISTRY & CHEMICAL TECHNOLOGY 2021. [DOI: 10.23939/chcht15.04.493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
“Green” synthesis of silver nanoparticles (AgNPs) by a galvanic replacement (GR) on magnesium in solutions of sodium polyacrylate (NaPA) under ultrasound (42 kHz) is reported. The mechanism of combined action of GR and ultrasound on the formation of nanoparticles is proposed. Synthesized solutions of AgNPs are characterized by an absorption maximum at 410 nm, the value of which does not depend on the concentrations of precursors (AgNO3 and NaPA) and the duration of the process. The dimensions of nanoparticles that have a spherical shape do not exceed 30 nm. With increasing concentration of surfactant, there is a tendency to decrease in size. The rate of synthesis of AgNPs increases almost in proportion to the concentration of AgNO3 in the solution, while the effect of NaPA concentration is negligible. The synthesized nanoparticles efficiently demonstrated a bactericide effect on Escherichia coli and Staphylococcus aureus.
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Li D, Tan R, Mi X, Fang C, Tu Y. An electrochemiluminescent biosensor for noninvasive glucose detection based on cluster-like AuAg hollowed-nanoparticles. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106271] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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7
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Wang J, Zhang P, Xia Q, Wei Y, Chen W, Wang J, Li P, Li B, Zhou X. [Application of DNA origami in nanobiomedicine]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2021; 41:960-964. [PMID: 34238752 DOI: 10.12122/j.issn.1673-4254.2021.06.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The development of DNA nanotechnology make it possible to artificially generate complex nucleic acid nanostructures with controllable sizes and shapes. DNA origami emerges as an effective and versatile approach to construct two- and three-dimensional programmable nanostructures, and represents a milestone in the development of structural DNA nanotechnology. Due to its high degree of controllable geometry, spatial addressability, easy chemical modification and good biocompatibility, DNA origami has great potentials for applications in many fields. In this review, we briefly summarize the applications of DNA origami in antigen-antibody interaction, targeted drug delivery and the synthesis of biomaterials.
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Affiliation(s)
- J Wang
- Schoolof Physics Science and Technology, Ningbo University, Ningbo 315211, China
| | - P Zhang
- Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Q Xia
- Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Y Wei
- Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.,Basic Interdisciplinary Research Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - W Chen
- Schoolof Physics Science and Technology, Ningbo University, Ningbo 315211, China
| | - J Wang
- Schoolof Physics Science and Technology, Ningbo University, Ningbo 315211, China
| | - P Li
- Schoolof Physics Science and Technology, Ningbo University, Ningbo 315211, China
| | - B Li
- Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.,Basic Interdisciplinary Research Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - X Zhou
- Schoolof Physics Science and Technology, Ningbo University, Ningbo 315211, China
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Hubert C, Chomette C, Désert A, Madeira A, Perro A, Florea I, Ihiawakrim D, Ersen O, Lombardi A, Pertreux E, Vialla F, Maioli P, Crut A, Del Fatti N, Vallée F, Majimel J, Ravaine S, Duguet E, Tréguer-Delapierre M. Versatile template-directed synthesis of gold nanocages with a predefined number of windows. NANOSCALE HORIZONS 2021; 6:311-318. [PMID: 33439184 DOI: 10.1039/d0nh00620c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Highly symmetrical gold nanocages can be produced with a controllable number of circular windows of either 2, 3, 4, 6 or 12 via an original fabrication route. The synthetic pathway includes three main stages: the synthesis of silica/polystyrene multipod templates, the regioselective seeded growth of a gold shell on the unmasked part of the silica surface and the development of gold nanocages by dissolving/etching the templates. Electron microscopy and tomography provide evidence of the symmetrical features of the as-obtained nanostructures. The optical properties of nanocages with 4 and 12 windows were measured at the single particle level by spatial modulation spectroscopy and correlated with numerical simulations based on finite-element modeling. The new multi-step synthesis approach reported here also allows the synthesis of rattle-like nanostructures through filling of the nanocages with a guest nano-object. With the potential to adjust the chemical composition, size and geometry of both the guest particle and the host cage, it opens new routes towards the fabrication of hollow nanostructures of high interest for a variety of applications including sensing devices, catalytic reactors and biomedicine.
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Affiliation(s)
- Céline Hubert
- Univ. Bordeaux, CNRS, ICMCB, UMR 5026, Pessac 33600, France.
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Kim DH, Woo HC, Kim MH. Room-Temperature Synthesis of Hollow Polymer Microparticles with an Open Hole on the Surface and Their Application. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13700-13710. [PMID: 31589450 DOI: 10.1021/acs.langmuir.9b02780] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Compared with hollow microparticles with a completely closed shell structure, hollow polymer microparticles with an open hole on their surface have attracted considerable attention because of the obvious importance of the open hole on their surface; however, the development of a facile method to synthesize such unique open-ended hollow particles has remained a great challenge. In this study, an easy-to-use method was developed to rapidly produce monodispersed hollow and pored microparticles in high reaction yield at room temperature. The key to achieving the unusually shaped polystyrene (PS) microparticles was the use of anisotropic PS seeds. When hollow and dimpled PS seeds prepared using a modified dispersion polymerization method were dispersed in a water-toluene mixture followed by solvent evaporation under ambient conditions, they transformed into hollow PS microparticles with an open hole on their surface. A plausible mechanism for the transformation of the PS microparticles during the swelling and drying processes was proposed on the basis of our results and observations. The structural features of the hollow and pored PS microparticles motivated us to use the particles as a catalyst support. By using modified heterophase polymer dispersion processing involving the addition of a Ag precursor, hollow and pored PS microparticles covered with Ag nanocrystals were obtained on the basis of the in situ reduction of metal precursor on the surface of polymer particles. The resulting Ag nanocrystals/PS hybrid microparticles exhibited enhanced catalytic activity at low concentrations of nanocrystals and could be reused several times without loss of activity when used as catalysts for the reduction of 4-nitrophenol to 4-aminophenol with sodium borohydride.
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Affiliation(s)
- Dae Hwan Kim
- Department of Polymer Engineering , Pukyong National University , 45 Yongso-ro , Nam-gu, Busan 48513 , Republic of Korea
| | - Hee-Chul Woo
- Department of Chemical Engineering , Pukyong National University , 45 Yongso-ro , Nam-gu, Busan 48513 , Republic of Korea
| | - Mun Ho Kim
- Department of Polymer Engineering , Pukyong National University , 45 Yongso-ro , Nam-gu, Busan 48513 , Republic of Korea
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Han HJ, Park JH, Park JK, Kristanto I, Park BJ, Kwak SK, Im SH. Uniform Ag Nanocubes Prepared by AgCl Particle-Mediated Heterogeneous Nucleation and Disassembly and Their Mechanism Study by DFT Calculation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1904031. [PMID: 31496116 DOI: 10.1002/smll.201904031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 08/23/2019] [Indexed: 06/10/2023]
Abstract
Uniform Ag nanocubes are reproducibly synthesized by a AgCl particle-mediated heterogeneous nucleation and disassembly process in polyol chemistry. By introducing N,N-dimethylformamide (DMF) in a conventional polyol method with HCl etchant, Ag nanocrystals (NCs) begin to be nucleated on the surface of AgCl-precipitated particles due to the promoted reduction reaction by DMF. The nucleated Ag NCs on the AgCl particles are grown to Ag nanocubes in shape by consuming Ag sources from the AgCl mother particles. Eventually the grown Ag nanocubes are disassembled from the mother AgCl particles because the AgCl particles are fully digested by the growing Ag nanocubes. Density functional theory calculation confirms that the Ag atoms can be favorably deposited on the (100) facet of AgCl particles and the Ag nuclei on the AgCl particles tend to reveal (100) facet.
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Affiliation(s)
- Hye Ji Han
- Department of Chemical Engineering, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
| | - Ju Hyun Park
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Jin Kyoung Park
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Imanuel Kristanto
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Bum Jun Park
- Department of Chemical Engineering, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
| | - Sang Kyu Kwak
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea
| | - Sang Hyuk Im
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
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Venditti I. Engineered Gold-Based Nanomaterials: Morphologies and Functionalities in Biomedical Applications. A Mini Review. Bioengineering (Basel) 2019; 6:bioengineering6020053. [PMID: 31185667 PMCID: PMC6630817 DOI: 10.3390/bioengineering6020053] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 06/06/2019] [Accepted: 06/07/2019] [Indexed: 12/27/2022] Open
Abstract
In the last decade, several engineered gold-based nanomaterials, such as spheres, rods, stars, cubes, hollow particles, and nanocapsules have been widely explored in biomedical fields, in particular in therapy and diagnostics. As well as different shapes and dimensions, these materials may, on their surfaces, have specific functionalizations to improve their capability as sensors or in drug loading and controlled release, and/or particular cell receptors ligands, in order to get a definite targeting. In this review, the up-to-date progress will be illustrated regarding morphologies, sizes and functionalizations, mostly used to obtain an improved performance of nanomaterials in biomedicine. Many suggestions are presented to organize and compare the numerous and heterogeneous experimental data, such as the most important chemical-physical parameters, which guide and control the interaction between the gold surface and biological environment. The purpose of all this is to offer the readers an overview of the most noteworthy progress and challenges in this research field.
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Affiliation(s)
- Iole Venditti
- Department of Sciences, University of Roma Tre, via della Vasca Navale 79, 00146 Rome, Italy.
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