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Dey P, Thurecht KJ, Fredericks PM, Blakey I. Tagged Core-Satellite Nanoassemblies: Role of Assembling Sequence on Surface-Enhanced Raman Scattering (SERS) Performance. APPLIED SPECTROSCOPY 2019; 73:1428-1435. [PMID: 31124368 DOI: 10.1177/0003702819856666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Plasmonic nanoassemblies with amplified optical responses are attractive as chemo/bio sensors and diagnostic tracking agents. For real-life implementation, such nanostructures require a well-designed and controlled formation for maximizing the optical amplification. Forming these nanoassemblies typically requires numerous steps; however, the importance of the sequence of the steps is typically not discussed. Thus, here we have investigated the role of the sequence of tagging (or labeling, barcoding) of such plasmonic nanoassemblies with Raman active molecules in a quest to maximize the surface-enhanced Raman scattering (SERS) enhancement that could be achieved from the nanoassemblies. We have chosen the core-satellite nanoassembly arrangement to study the role of tagging sequence because it allows us to keep structural parameters constant that would otherwise influence the SERS amplification. We demonstrate that incorporating the tag molecule at an assembly point before formation of the nanojunctions leads to more tag molecules being positioned at the core-satellite nanojunctions, thereby resulting in higher SERS signal enhancement. This will thus prove to be a useful tool in fully utilizing the nanoassembly morphology generated hot-spot and maximizing its SERS performance.
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Affiliation(s)
- Priyanka Dey
- Centre of Physics, Chemistry and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, Australia
- Current affiliation: School of Physics and Astronomy, University of Exeter, Exeter, UK
| | - Kristofer J Thurecht
- Australian Institute of Bioengineering and Nanotechnology and Centre of Advanced Imaging, University of Queensland, St. Lucia, QLD, Australia
| | - Peter M Fredericks
- Centre of Physics, Chemistry and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, Australia
| | - Idriss Blakey
- Australian Institute of Bioengineering and Nanotechnology and Centre of Advanced Imaging, University of Queensland, St. Lucia, QLD, Australia
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2
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Haikal RR, Elmansi AM, Soliman AB, Aly P, Hassan YS, Berber MR, Hafez IH, Hassanien A, Alkordi MH. Tuning surface accessibility and catalytic activity of Au nanoparticles through immobilization within porous-organic polymers. RSC Adv 2016. [DOI: 10.1039/c6ra20932g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A facile approach to immobilize Au nanoparticles within porous-organic polymers is reported, resulting in controlled access and reactivity of the Au nanoparticles.
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Affiliation(s)
- Rana R. Haikal
- Zewail City of Science and Technology
- Center for Materials Science
- Giza
- Egypt
| | - Ahmed M. Elmansi
- Zewail City of Science and Technology
- Center for Materials Science
- Giza
- Egypt
| | - Ahmed B. Soliman
- Zewail City of Science and Technology
- Center for Materials Science
- Giza
- Egypt
| | - Poussy Aly
- Zewail City of Science and Technology
- Center for Materials Science
- Giza
- Egypt
| | - Youssef S. Hassan
- Zewail City of Science and Technology
- Center for Materials Science
- Giza
- Egypt
| | - Mohamed R. Berber
- Zewail City of Science and Technology
- Center for Nanotechnology
- Giza
- Egypt
| | - Inas H. Hafez
- Zewail City of Science and Technology
- Center for Nanotechnology
- Giza
- Egypt
| | - Abdou Hassanien
- Zewail City of Science and Technology
- Center for Nanotechnology
- Giza
- Egypt
| | - Mohamed H. Alkordi
- Zewail City of Science and Technology
- Center for Materials Science
- Giza
- Egypt
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4
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Rossner C, Glatter O, Saldanha O, Köster S, Vana P. The Structure of Gold-Nanoparticle Networks Cross-Linked by Di- and Multifunctional RAFT Oligomers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10573-10582. [PMID: 26340689 DOI: 10.1021/acs.langmuir.5b02699] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Gold nanoparticle (AuNP) network structures featuring particles from the two-phase Brust-Schiffrin synthesis and linear RAFT oligomers of styrene with two and multiple trithiocarbonate (TTC) groups along their backbone have been investigated in detail. Insights into the internal structures of these particle networks could be obtained from small-angle X-ray scattering experiments, showing that primary AuNPs are cross-linked by the employed molecular linker. The extent of AuNP network formation was investigated by means of dynamic light scattering and UV/visible extinction spectroscopy, showing an abrupt attenuation of network formation after a critical degree of polymerization of the cross-linker is exceeded. Analysis of transmission electron micrographs indicated a three-dimensional shape of the particle superstructures, which is evenly filled with the primary AuNPs. From the results obtained in this study, guidelines for the fabrication of nanoparticle networks from the self-assembly with macromolecular cross-linkers are suggested.
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Affiliation(s)
- Christian Rossner
- Institut für Physikalische Chemie, Georg-August-Universität Göttingen , Tammannstraße 6, D-37077 Göttingen, Germany
| | - Otto Glatter
- Institut für Anorganische Chemie, Technische Universität Graz , Stremayrgasse 9/V, A-8010 Graz, Austria
| | - Oliva Saldanha
- Institut für Röntgenphysik, Georg-August-Universität Göttingen , Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | - Sarah Köster
- Institut für Röntgenphysik, Georg-August-Universität Göttingen , Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | - Philipp Vana
- Institut für Physikalische Chemie, Georg-August-Universität Göttingen , Tammannstraße 6, D-37077 Göttingen, Germany
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5
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Zhang Y, Xiao J, Dong W, Peng Z, An D. Transition Metal-Free One-Pot Protocol Toward Conjugated Arylbutadiynyl Sulfides. HETEROATOM CHEMISTRY 2015. [DOI: 10.1002/hc.21280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yanqin Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering; Hunan University; Changsha 410082 People's Republic of China
| | - Jing Xiao
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering; Hunan University; Changsha 410082 People's Republic of China
| | - Wanrong Dong
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering; Hunan University; Changsha 410082 People's Republic of China
| | - Zhihong Peng
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering; Hunan University; Changsha 410082 People's Republic of China
| | - Delie An
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering; Hunan University; Changsha 410082 People's Republic of China
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6
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Skeete Z, Cheng H, Crew E, Lin L, Zhao W, Joseph P, Shan S, Cronk H, Luo J, Li Y, Zhang Q, Zhong CJ. Design of functional nanoparticles and assemblies for theranostic applications. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21752-21768. [PMID: 25111087 DOI: 10.1021/am502693t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nanostructured materials have found increasing applications in medical therapies and diagnostics (theranostics). The main challenge is the ability to impart the nanomaterials with structurally tailored functional properties which can effectively target biomolecules but also provide signatures for effective detection. The harnessing of functional nanoparticles and assemblies serves as a powerful strategy for the creation of the structurally tailored multifunctional properties. This article highlights some of the important design strategies in recent investigation of metals (especially gold and silver), and magnetically functionalized nanoparticles, and molecularly assembled or biomolecularly conjugated nanoparticles with tunable optical, spectroscopic, magnetic, and electrical properties for applications in several areas of potential theranostic interests. Examples include colorimetric detection of amino acids and small peptides, surface-enhanced Raman scattering detection of biomolecular recognition of proteins and DNAs, delivery in cell transfection and bacteria inactivation, and chemiresistive detection of breath biomarkers. A major emphasis is placed on understanding how the control of the nanostructures and the molecular and biomolecular interactions impact these biofunctional properties, which has important implications for bottom-up designs of theranostic materials.
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Affiliation(s)
- Zakiya Skeete
- Department of Chemistry, State University of New York at Binghamton , Binghamton, New York 13902, United States
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7
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Devid EJ, Martinho PN, Kamalakar MV, Prendergast Ú, Kübel C, Lemma T, Dayen JF, Keyes TE, Doudin B, Ruben M, van der Molen SJ. The influence of molecular mobility on the properties of networks of gold nanoparticles and organic ligands. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:1664-1674. [PMID: 25383278 PMCID: PMC4222375 DOI: 10.3762/bjnano.5.177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 08/26/2014] [Indexed: 06/04/2023]
Abstract
We prepare and investigate two-dimensional (2D) single-layer arrays and multilayered networks of gold nanoparticles derivatized with conjugated hetero-aromatic molecules, i.e., S-(4-{[2,6-bipyrazol-1-yl)pyrid-4-yl]ethynyl}phenyl)thiolate (herein S-BPP), as capping ligands. These structures are fabricated by a combination of self-assembly and microcontact printing techniques, and are characterized by electron microscopy, UV-visible spectroscopy and Raman spectroscopy. Selective binding of the S-BPP molecules to the gold nanoparticles through Au-S bonds is found, with no evidence for the formation of N-Au bonds between the pyridine or pyrazole groups of BPP and the gold surface. Subtle, but significant shifts with temperature of specific Raman S-BPP modes are also observed. We attribute these to dynamic changes in the orientation and/or increased mobility of the molecules on the gold nanoparticle facets. As for their conductance, the temperature-dependence for S-BPP networks differs significantly from standard alkanethiol-capped networks, especially above 220 K. Relating the latter two observations, we propose that dynamic changes in the molecular layers effectively lower the molecular tunnel barrier for BPP-based arrays at higher temperatures.
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Affiliation(s)
- Edwin J Devid
- Huygens-Kamerlingh Onnes Laboratory, Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
| | - Paulo N Martinho
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Centro de Química e Bioquímica (CQB), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - M Venkata Kamalakar
- Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Úna Prendergast
- School of Chemical Science, Dublin City University (DCU), Dublin 9, Ireland
| | - Christian Kübel
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Karlsruhe Nano Micro Facility (KNMF) Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tibebe Lemma
- School of Chemical Science, Dublin City University (DCU), Dublin 9, Ireland
| | - Jean-François Dayen
- Université de Strasbourg, IPCMS-CMRS UMR 7504, 23 Rue du Loess, 67034 Strasbourg, France
| | - Tia E Keyes
- School of Chemical Science, Dublin City University (DCU), Dublin 9, Ireland
| | - Bernard Doudin
- Université de Strasbourg, IPCMS-CMRS UMR 7504, 23 Rue du Loess, 67034 Strasbourg, France
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Université de Strasbourg, IPCMS-CMRS UMR 7504, 23 Rue du Loess, 67034 Strasbourg, France
| | - Sense Jan van der Molen
- Huygens-Kamerlingh Onnes Laboratory, Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
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8
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Cheng HW, Luo J, Zhong CJ. An aggregative growth process for controlling size, shape and composition of metal, alloy and core–shell nanoparticles toward desired bioapplications. J Mater Chem B 2014; 2:6904-6916. [DOI: 10.1039/c4tb00962b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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9
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Zhu YX, Zhao ZJ, Zhang Y, Su Q, Peng ZH, An DL. Synthesis of Bis(arylethynyl) Selenides by One-Pot Protocol. HETEROATOM CHEMISTRY 2014. [DOI: 10.1002/hc.21208] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yun-Xing Zhu
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering, Hunan University; Changsha 410082 People's Republic of China
| | - Zi-Jian Zhao
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering, Hunan University; Changsha 410082 People's Republic of China
| | - Yang Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering, Hunan University; Changsha 410082 People's Republic of China
| | - Qiong Su
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering, Hunan University; Changsha 410082 People's Republic of China
| | - Zhi-Hong Peng
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering, Hunan University; Changsha 410082 People's Republic of China
| | - De-Lie An
- State Key Laboratory of Chemo/Biosensing and Chemometrics; College of Chemistry and Chemical Engineering, Hunan University; Changsha 410082 People's Republic of China
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10
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Dey P, Blakey I, Thurecht KJ, Fredericks PM. Hyperbranched polymer-gold nanoparticle assemblies: role of polymer architecture in hybrid assembly formation and SERS activity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2249-2258. [PMID: 24548062 DOI: 10.1021/la4047462] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Plasmonic gold nanoassemblies that self-assemble with the aid of linking molecules or polymers have the potential to yield controlled hierarchies of morphologies and consequently result in materials with tailored optical (e.g., localized surface plasmon resonances (LSPR)) and spectroscopic properties (e.g., surface-enhanced Raman scattering (SERS)). Molecular linkers that are structurally well-defined are promising for forming hybrid nanoassemblies which are stable in aqueous solution and are increasingly finding application in nanomedicine. Despite much ongoing research in this field, the precise role of molecular linkers in governing the morphology and properties of the hybrid nanoassemblies remains unclear. Previously we have demonstrated that branched linkers, such as hyperbranched polymers, with specific anchoring end groups can be successfully employed to form assemblies of gold NPs demonstrating near-infrared SPRs and intense SERS scattering. We herein introduce a tailored polymer as a versatile molecular linker, capable of manipulating nanoassembly morphologies and hot-spot density. In addition, this report explores the role of the polymeric linker architecture, specifically the degree of branching of the tailored polymer in determining the formation, morphology, and properties of the hybrid nanoassemblies. The degree of branching of the linker polymer, in addition to the concentration and number of anchoring groups, is observed to strongly influence the self-assembly process. The assembly morphology shifts primarily from 1D-like chains to 2D plates and finally to 3D-like globular structures, with increase in degree of branching of the macromolecular linker. Insights have been gained into how the morphology influences the SERS performance of these nanoassemblies with respect to hot-spot density. These findings supplement the understanding of the morphology determining nanoassembly formation and pave the way for the possible application of these nanoassemblies as SERS biosensors for medical diagnostics.
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Affiliation(s)
- Priyanka Dey
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, Queensland 4001, Australia
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11
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Dey P, Zhu S, Thurecht KJ, Fredericks PM, Blakey I. Self assembly of plasmonic core–satellite nano-assemblies mediated by hyperbranched polymer linkers. J Mater Chem B 2014; 2:2827-2837. [DOI: 10.1039/c4tb00263f] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The morphology of plasmonic nano-assemblies has a direct influence on optical properties, such as localised surface plasmon resonance (LSPR) and surface enhanced Raman scattering (SERS) intensity.
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Affiliation(s)
- Priyanka Dey
- School of Chemistry
- Physics and Mechanical Engineering
- Queensland University of Technology
- Brisbane, Australia
- Institute of Future Environments
| | - Shaoli Zhu
- Australian Institute of Bioengineering and Nanotechnology
- University of Queensland
- St. Lucia, Australia
| | - Kristofer J. Thurecht
- Australian Institute of Bioengineering and Nanotechnology
- University of Queensland
- St. Lucia, Australia
- Centre for Advanced Imaging
- University of Queensland
| | - Peter M. Fredericks
- School of Chemistry
- Physics and Mechanical Engineering
- Queensland University of Technology
- Brisbane, Australia
- Institute of Future Environments
| | - Idriss Blakey
- Australian Institute of Bioengineering and Nanotechnology
- University of Queensland
- St. Lucia, Australia
- Centre for Advanced Imaging
- University of Queensland
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Su Q, Yan H, Gao SC, Xie DX, Cai QY, Shao G, Peng ZH, An DL. Efficient One-Pot Preparation of Methylthio Arylbutadiynes by Double Elimination Protocol. SYNTHETIC COMMUN 2013. [DOI: 10.1080/00397911.2012.729280] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Qiong Su
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
| | - Hong Yan
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
| | - Shi-Chao Gao
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
| | - De-Xun Xie
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
| | - Qing-Yun Cai
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
| | - Guang Shao
- b College of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou , China
| | - Zhi-Hong Peng
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
| | - De-Lie An
- a State Key Laboratory of Chemo/biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha , China
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13
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Guerrini L, Graham D. Molecularly-mediated assemblies of plasmonic nanoparticles for Surface-Enhanced Raman Spectroscopy applications. Chem Soc Rev 2013; 41:7085-107. [PMID: 22833008 DOI: 10.1039/c2cs35118h] [Citation(s) in RCA: 244] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In recent years, Surface-Enhanced Raman Spectroscopy (SERS) has experienced a tremendous increase of attention in the scientific community, expanding to a continuously wider range of diverse applications in nanoscience, which can mostly be attributed to significant improvements in nanofabrication techniques that paved the way for the controlled design of reliable and effective SERS nanostructures. In particular, the plasmon coupling properties of interacting nanoparticles are extremely intriguing due to the concentration of enormous electromagnetic enhancements at the interparticle gaps. Recently, great efforts have been devoted to develop new nanoparticle assembly strategies in suspension with improved control over hot-spot architecture and cluster structure, laying the foundation for the full exploitation of their exceptional potential as SERS materials in a wealth of chemical and biological sensing. In this review we summarize in an exhaustive and systematic way the state-of-art of plasmonic nanoparticle assembly in suspension specifically developed for SERS applications in the last 5 years, focusing in particular on those strategies which exploited molecular linkers to engineer interparticle gaps in a controlled manner. Importantly, the novel advances in this rather new field of nanoscience are organized into a coherent overview aimed to rationally describe the different strategies and improvements in the exploitation of colloidal nanoparticle assembly for SERS application to real problems.
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Affiliation(s)
- Luca Guerrini
- Centre for Molecular Nanometrology, WestCHEM, Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
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14
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Su Q, Zhao ZJ, Xu F, Lou PC, Zhang K, Xie DX, Shi L, Cai QY, Peng ZH, An DL. One-Pot Preparation of Arylethynyl Sulfides and Bis(arylethynyl) Sulfides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201422] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Dey P, Blakey I, Thurecht KJ, Fredericks PM. Self-assembled hyperbranched polymer-gold nanoparticle hybrids: understanding the effect of polymer coverage on assembly size and SERS performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:525-533. [PMID: 23244573 DOI: 10.1021/la304034b] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In the past few years, remarkable progress has been made in unveiling novel and unique optical properties of strongly coupled plasmonic nanostructures. However, the application of such plasmonic nanostructures in biomedicine remains challenging because of the lack of facile and robust assembly methods for producing stable nanostructures. Previous attempts to achieve plasmonic nanoassemblies using molecular ligands were limited by the lack of flexibility that could be exercised in forming them. Here, we report the utilization of tailor-made hyperbranched polymers (HBP) as linkers to assemble gold nanoparticles (NPs) into nanoassemblies. The ease and flexibility in tuning the particle size and number of branch ends of an HBP make it an ideal candidate as a linker, as opposed to DNA, small organic molecules, and linear or dendrimeric polymers. We report a strong correlation of polymer (HBP) concentration with the size of the hybrid nanoassemblies and "hot-spot" density. We have shown that such solutions of stable HBP-gold nanoassemblies can be barcoded with various Raman tags to provide improved surface-enhanced Raman scattering (SERS) compared to that of nonaggregated NP systems. These Raman-barcoded hybrid nanoassemblies, with further optimization of the NP shape, size, and hot-spot density, may find application as diagnostic tools in nanomedicine.
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Affiliation(s)
- Priyanka Dey
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4001, Australia
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16
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Crew E, Yan H, Lin L, Yin J, Skeete Z, Kotlyar T, Tchah N, Lee J, Bellavia M, Goodshaw I, Joseph P, Luo J, Gal S, Zhong CJ. DNA assembly and enzymatic cutting in solutions: a gold nanoparticle based SERS detection strategy. Analyst 2013; 138:4941-9. [DOI: 10.1039/c3an00683b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Lin L, Crew E, Yan H, Shan S, Skeete Z, Mott D, Krentsel T, Yin J, Chernova NA, Luo J, Engelhard MH, Wang C, Li Q, Zhong CJ. Bifunctional nanoparticles for SERS monitoring and magnetic intervention of assembly and enzyme cutting of DNAs. J Mater Chem B 2013; 1:4320-4330. [DOI: 10.1039/c3tb20446d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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18
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Yan H, Zhu L, Li X, Kwok A, Li X, Ågren H, Zhao Y. Photothermal-responsive [2]rotaxanes. RSC Adv 2013. [DOI: 10.1039/c2ra22171c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Orbach M, Lahav M, Milko P, Wolf SG, van der Boom ME. Setting the environmental conditions for controlling gold nanoparticle assemblies. Angew Chem Int Ed Engl 2012; 51:7142-5. [PMID: 22696240 DOI: 10.1002/anie.201203291] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2012] [Indexed: 11/06/2022]
Abstract
Fundamental insights into the factors that control the properties and structure of gold nanoparticle (AuNP) based assemblies enable the design and construction of new materials. The dimensions (shape and size) and the optical properties of AuNP assemblies are affected by the electronic properties of the organic cross-linker and the nature of the AuNPs.
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Affiliation(s)
- Meital Orbach
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot-76100, Israel
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20
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Setting the Environmental Conditions for Controlling Gold Nanoparticle Assemblies. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203291] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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21
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Lin G, Wang Y, Zhang Q, Zhang X, Ji G, Ba L. Controllable formation and TEM spatial visualization of cross-linked gold nanoparticle spherical aggregates. NANOSCALE 2011; 3:4567-4570. [PMID: 21952917 DOI: 10.1039/c1nr10897b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Gold nanoparticles (NPs) were assembled and cross-linked into spherical aggregates by colloidal emulsion evaporation and ligand exchanging. The optical absorption, conventional transmission electron microscopy (TEM) and bright field (BF) TEM tomography confirm that the cross-linking of the pre-condensed aggregates generates high stability and compactness.
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Affiliation(s)
- Guangyao Lin
- State Key Laboratory of Bioelectronics, School of Biology and Medical Engineering, Department of Physics, Southeast University, Nanjing, 210096, People's Republic of China
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22
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Li S, Zhang Y, Xu X, Zhang L. Triple helical polysaccharide-induced good dispersion of silver nanoparticles in water. Biomacromolecules 2011; 12:2864-71. [PMID: 21542604 DOI: 10.1021/bm2001439] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Silver nanoparticles were constructed by using triple helical polysaccharide (lentinan) dissolved in water as matrix for the first time. The structure, morphology, and size of the nanocomposites in the polysaccharide aqueous solutions were investigated with UV-visible spectroscopy (UV-vis), transmission electron microscopy (TEM), and dynamic laser light scattering (DLS). The results revealed that the silver nanoparticles were attached to the polysaccharide chains through the strong noncovalent interactions, leading to the good dispersion of silver nanoparticles with mean radius of 6 nm in water. The silver nanoparticles were stable in the lentinan aqueous solution for 9 months. However, with an addition of NaOH, the polysaccharide with the imperfect helical structure broken partially by NaOH could aggregate in the alkali aqueous solution. The aggregation of the lentinan-bonded silver nanoparticles increased with an increase in the NaOH concentration, whereas the size of the silver nanoparticles barely changed, further confirming that the Ag nanoparticles were stable in this system. The aggregation was related to the conformation transition of the polysaccharide from the triple helix to random coil in the solution. A new method to detect the aggregates and aggregation rate was established according to the intensity of the maximum absorption peaks of the polysaccharide labeled by Ag nanoparticles in the UV spectrum.
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Affiliation(s)
- Sheng Li
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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