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Zhong L, Chen G, Yang T, Gu J, Ma C, Li L, Wu Y, Zhu C, Gao H, Yang Z, Hu A, Xu J, Qiu X, Shen J, Huang A. Al 2O 3@Ag composite structure as SERS substrate for sensitive detection of sodium thiocyanate. ANAL SCI 2023; 39:557-564. [PMID: 36680670 DOI: 10.1007/s44211-023-00268-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 01/04/2023] [Indexed: 01/22/2023]
Abstract
Sodium thiocyanate (NaSCN) can be added to fresh milk to enhance the sterilization ability of the lactoperoxidase system (LP system) in milk, extending shelf life. However, excessive intake of NaSCN can be harmful to human health because it can prevent absorption of iodine leading to disease. Also NaSCN can be used as a marker to distinguish smokers from non-smokers. In this work, we successfully synthesized meatball-like Al2O3@Ag composite structures as surface-enhanced Raman scattering (SERS) substrates using a simple wet chemical method adapted to conventional laboratory conditions. The substrate exhibited strong SERS enhancement for NaSCN. Under the optimal experiment conditions, we obtained a detection limit of 0.28 μg L-1 and a quantification limit of 1 μg L-1, R2 = 0.992. Based on the analysis of the intensity of SERS characteristic peak, the substrate had good reproducibility and uniformity. In summary, the Al2O3@Ag composite structure achieved sensitive SERS detection of NaSCN. Combining the facile and low-cost methods, we believe that the SERS detection method developed in this work can be used as a potential candidate for biosensing applications in the future.
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Affiliation(s)
- Lvyuan Zhong
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Guoqing Chen
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China.
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China.
| | - Taiqun Yang
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Jiao Gu
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Chaoqun Ma
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Lei Li
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Yamin Wu
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Chun Zhu
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Hui Gao
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Zichen Yang
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
- School of Internet of Things Engineering, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
| | - Anqi Hu
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Jinzeng Xu
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Xiaoqian Qiu
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Jialu Shen
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
| | - Anlan Huang
- School of Science, Jiangnan University, Lihu Avenue 1800, Wuxi, 214122, China
- Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Lihu Avenue 1800, Wuxi, 214122, China
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Sabbouh M, Nikitina A, Rogacheva E, Nebalueva A, Shilovskikh V, Sadovnichii R, Koroleva A, Nikolaev K, Kraeva L, Ulasevich S, Skorb E. Sonochemical fabrication of gradient antibacterial materials based on Cu-Zn alloy. ULTRASONICS SONOCHEMISTRY 2023; 92:106247. [PMID: 36508894 PMCID: PMC9763737 DOI: 10.1016/j.ultsonch.2022.106247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 11/20/2022] [Accepted: 11/25/2022] [Indexed: 06/17/2023]
Abstract
At present research, we highlight ultrasonic treatment as a new way to create materials with a gradient change of chemical or physical properties. We demonstrate the possibility to fabricate novel materials with biocide activity based on simple and cheap Cu-Zn alloy. In this research, we propose a green preparative technique for the sonication of an alloy in an alkali solution. The method leads to a significant visual change and differentiation of particles into three different fractions. Due to the chemical micro gradients in media near the solid surface under intensive sonication, fast formation of specific functional groups occurs on the particles' surface. The particles were studied X-ray diffraction analysis (XRD) analysis, the field-emission scanning electron microscope (SEM) as well as electron backscatter diffraction (EBSD) mode, X-ray Photoelectron Spectroscopy (XPS), the differential pulse anodic stripping voltammetry (DPASV) technique. A strong correlation of both methods proves a redistribution of copper ions from Fraction I to Fraction III that influence for the antibacterial properties of the prepared material. The different biocidal activity was demonstrated for each separated Fraction that could be related to their different phase content and ability to release the different types of ions.
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Affiliation(s)
- Mirna Sabbouh
- ITMO University, 9 Lomonosova Street, 191002 St. Petersburg, Russia
| | - Anna Nikitina
- ITMO University, 9 Lomonosova Street, 191002 St. Petersburg, Russia
| | - Elizaveta Rogacheva
- Pasteur Institute of Epidemiology and Microbiology, 14 Mira Street, Saint Petersburg 197101, Russia
| | - Anna Nebalueva
- ITMO University, 9 Lomonosova Street, 191002 St. Petersburg, Russia
| | - Vladimir Shilovskikh
- ITMO University, 9 Lomonosova Street, 191002 St. Petersburg, Russia; Saint-Petersburg State University, Russia
| | | | | | | | - Lyudmila Kraeva
- Pasteur Institute of Epidemiology and Microbiology, 14 Mira Street, Saint Petersburg 197101, Russia
| | | | - Ekaterina Skorb
- ITMO University, 9 Lomonosova Street, 191002 St. Petersburg, Russia
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3
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Wang W, Wen J, Shevchenko E, Ma X. Spontaneous formation of anisotropic microrods from paraffin wax in an aqueous environment. SOFT MATTER 2021; 18:156-161. [PMID: 34849514 DOI: 10.1039/d1sm01515j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The construction of functional nano-/micro-architectures through self-assembly and self-organization of organic molecules and polymeric materials plays an important role in the development of many technologies. In this study, we report the spontaneous formation of uniform polymer microrods with lengths of up to a few tens of micrometers from paraffin wax. Through a solvent attrition approach, colloidal structures of paraffin wax are introduced into water. After the initial growth stage, the microrods undergo morphological transformation and end-to-end aggregation, processes likely driven by thermodynamics to create equilibrium structures with minimal interfacial energies. The polymer microrods can effectively absorb hydrophobic nanoparticles, indicating their potential to serve as host materials for functional components. The formation of polymer microrods from paraffin wax and their spontaneous growth mechanism discovered in this study may provide new insights to the self-assembly of microstructures.
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Affiliation(s)
- Wei Wang
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Jianguo Wen
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Elena Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Xuedan Ma
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Consortium for Advanced Science and Engineering, University of Chicago, Chicago, Illinois 60637, USA.
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Sabbouh M, Nikitina A, Rogacheva E, Kraeva L, Ulasevich SA, Skorb EV, Nosonovsky M. Separation of motions and vibrational separation of fractions for biocide brass. ULTRASONICS SONOCHEMISTRY 2021; 80:105817. [PMID: 34773755 PMCID: PMC8592938 DOI: 10.1016/j.ultsonch.2021.105817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/26/2021] [Accepted: 11/01/2021] [Indexed: 05/09/2023]
Abstract
The mathematical method of separation of motions represents the effect of fast high-frequency oscillations by an effective averaged force or potential. Ultrasound acoustic vibrations are an example of such rapid oscillations leading to cavitation in water due to the gas phase formation (bubbles). Ultrasound cavitation is used to treat the surface of brass microparticles submerged in water. The formation of bubbles and their collapse triggers the modification of surface roughness and chemical composition. Consequently, the suspension separates into various fractions related to demonstrating biocide properties. While the exact mechanism of this process is complex, it can be explained phenomenologically by using the Onsager reciprocal relations for coupling the copper ion diffusion with the gas phase separation in water as a result of the action of the effective average vibrational force.
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Affiliation(s)
- Mirna Sabbouh
- Infochemistry Scientific Center, ITMO University, 9 Lomonosov St., Saint Petersburg, 191002, Russia
| | - Anna Nikitina
- Infochemistry Scientific Center, ITMO University, 9 Lomonosov St., Saint Petersburg, 191002, Russia
| | - Elizaveta Rogacheva
- Pasteur Institute of Epidemiology and Microbiology, 14 Mira Street, Saint Petersburg, 197101, Russia
| | - Lyudmila Kraeva
- Pasteur Institute of Epidemiology and Microbiology, 14 Mira Street, Saint Petersburg, 197101, Russia
| | - Sviatlana A Ulasevich
- Infochemistry Scientific Center, ITMO University, 9 Lomonosov St., Saint Petersburg, 191002, Russia.
| | - Ekaterina V Skorb
- Infochemistry Scientific Center, ITMO University, 9 Lomonosov St., Saint Petersburg, 191002, Russia
| | - Michael Nosonovsky
- Infochemistry Scientific Center, ITMO University, 9 Lomonosov St., Saint Petersburg, 191002, Russia.
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Nenashkina A, Koltsov S, Orlova OY, Nikitina AA, Kirilenko DA, Andreeva DV, Blanco-Formoso M, Pazos-Perez N, Alvarez-Puebla R, Skorb EV. Silver melamine thin film as a flexible platform for SERS analysis. NANOSCALE 2021; 13:7375-7380. [PMID: 33889896 DOI: 10.1039/d0nr08543j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
New SERS detection platforms are required for the quick and easy preparation of sensing devices for food, agriculture, and environmental science. For quantitative sensing, it is important that a sensing material, in addition to efficient sensing, provides extraction and concentration of the target molecules such as toxic pesticides or healthy vitamins. We design such films adopting the Liesegang rings formation process that includes the reaction-diffusion of silver nitrate and melamine followed by the precipitation of different intermediates and their reduction by light in a pectin medium. Surprisingly, we find that the presence of melamine provides an excellent substrate for the extraction of pollutants at the solid-liquid interface giving rise to a powerful but easy and fast method for the quantification of fruits' quality. The complex silver and melamine containing films show high sensitivity even at relatively low silver concentrations.
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Affiliation(s)
- Anastasia Nenashkina
- ITMO University, Lomonosova str. 9, 191002 Saint Petersburg, Russian Federation.
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Chauvin A, Lafuente M, Mevellec JY, Mallada R, Humbert B, Pina MP, Tessier PY, El Mel A. Lamellar nanoporous gold thin films with tunable porosity for ultrasensitive SERS detection in liquid and gas phase. NANOSCALE 2020; 12:12602-12612. [PMID: 32501469 DOI: 10.1039/d0nr01721c] [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
Lamellar nanoporous gold thin films, constituted of a stack of very thin layers of porous gold, are synthesized by chemical etching from a stack of successively deposited nanolayers of copper and gold. The gold ligament size, the pore size and the distance between lamellas are tunable in the few tens nanometer range by controlling the initial thickness of the layers and the etching time. The SERS activity of these lamellar porous gold films is characterized by their SERS responses after adsorption of probe bipyridine and naphtalenethiol molecules. The SERS signal is investigated as a function of the bipyridine concentration from 10-14 mol L-1 to 10-3 mol L-1. The higher SERS response corresponds to an experimental detection limit down to 10-12 mol L-1. These performance is mainly attributed to the specific nanoporous gold architecture and the larger accessible surface to volume ratio. The lamellar nanoporous gold substrate is explored for sensitive SERS detection of dimethyl methylphosphonate (DMMP), a surrogate molecule of the highly toxic G-series nerve agents. The resultant nanostructure facilitates the diffusion of target molecules through the nanopores and their localization at the enhancing metallic surface leading to the unequivocal Raman signature of DMMP at a concentration of 5 parts per million.
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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.
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7
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Guerrini L, Alvarez-Puebla RA, Pazos-Perez N. Surface Modifications of Nanoparticles for Stability in Biological Fluids. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1154. [PMID: 29986436 PMCID: PMC6073273 DOI: 10.3390/ma11071154] [Citation(s) in RCA: 239] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 06/29/2018] [Accepted: 07/02/2018] [Indexed: 02/06/2023]
Abstract
Due to the high surface: volume ratio and the extraordinary properties arising from the nanoscale (optical, electric, magnetic, etc.), nanoparticles (NPs) are excellent candidates for multiple applications. In this context, nanoscience is opening a wide range of modern technologies in biological and biomedical fields, among others. However, one of the main drawbacks that still delays its fast evolution and effectiveness is related to the behavior of nanomaterials in the presence of biological fluids. Unfortunately, biological fluids are characterized by high ionic strengths which usually induce NP aggregation. Besides this problem, the high content in biomacromolecules—such as lipids, sugars, nucleic acids and, especially, proteins—also affects NP stability and its viability for some applications due to, for example, the formation of the protein corona around the NPs. Here, we will review the most common strategies to achieve stable NPs dispersions in high ionic strength fluids and, also, antifouling strategies to avoid the protein adsorption.
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Affiliation(s)
- Luca Guerrini
- Departamento de Quimica Fisica e Inorganica and EMaS, Universitat Rovira i Virgili Carrer de Marcel•lí Domingo s/n, 43007 Tarragona, Spain.
| | - Ramon A Alvarez-Puebla
- Departamento de Quimica Fisica e Inorganica and EMaS, Universitat Rovira i Virgili Carrer de Marcel•lí Domingo s/n, 43007 Tarragona, Spain.
- Institución Catalana de Investigación y Estudios Avanzados, Passeig Lluís Companys 23, 08010 Barcelona, Spain.
| | - Nicolas Pazos-Perez
- Departamento de Quimica Fisica e Inorganica and EMaS, Universitat Rovira i Virgili Carrer de Marcel•lí Domingo s/n, 43007 Tarragona, Spain.
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Shang Y, Shi J, Liu H, Liu X, Wang ZG, Ding B. A bumpy gold nanostructure exhibiting DNA-engineered stimuli-responsive SERS signals. NANOSCALE 2018; 10:9455-9459. [PMID: 29749418 DOI: 10.1039/c8nr00986d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present a SERS-active gold nanostructure with built-in electromagnetic hotspots formed by densely packed gold nanoparticles on a gold nanorod. Cy3 labeled stimuli-responsive DNA motifs were introduced to the SERS-active nanostructure. The SERS signals can be switched ON and OFF reversibly in response to external stimuli (pH, metal ions or organic molecules).
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Affiliation(s)
- Yingxu Shang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P.R.China.
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Baidukova O, Skorb EV. Ultrasound-assisted synthesis of magnesium hydroxide nanoparticles from magnesium. ULTRASONICS SONOCHEMISTRY 2016; 31:423-8. [PMID: 26964968 DOI: 10.1016/j.ultsonch.2016.01.034] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 01/25/2016] [Accepted: 01/28/2016] [Indexed: 05/21/2023]
Abstract
Acoustic cavitation in water provides special kinetic and thermodynamic conditions for chemical synthesis and nanostructuring of solids. Using cavitation phenomenon, we obtained magnesium hydroxide from pure magnesium. This approach allows magnesium hydroxide to be synthesized without the requirement of any additives and non-aqueous solvents. Variation of sonochemical parameters enabled a total transformation of the metal to nanosized brucite with distinct morphology. Special attention is given to the obtaining of platelet-shaped, nanometric and de-agglomerated powders. The products of the synthesis were characterized by transmission electron microscopy (TEM), electron diffraction (ED), scanning electron microscopy (SEM) and X-ray diffraction (XRD).
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Affiliation(s)
- Olga Baidukova
- Max Planck Institute for Colloids and Interfaces, Am Mühlenberg 1, 14424 Potsdam, Germany.
| | - Ekaterina V Skorb
- Max Planck Institute for Colloids and Interfaces, Am Mühlenberg 1, 14424 Potsdam, Germany
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Skorb EV, Möhwald H. Ultrasonic approach for surface nanostructuring. ULTRASONICS SONOCHEMISTRY 2016; 29:589-603. [PMID: 26382299 DOI: 10.1016/j.ultsonch.2015.09.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 08/24/2015] [Accepted: 09/03/2015] [Indexed: 05/08/2023]
Abstract
The review is about solid surface modifications by cavitation induced in strong ultrasonic fields. The topic is worth to be discussed in a special issue of surface cleaning by cavitation induced processes since it is important question if we always find surface cleaning when surface modifications occur, or vice versa. While these aspects are extremely interesting it is important for applications to follow possible pathways during ultrasonic treatment of the surface: (i) solely cleaning; (ii) cleaning with following surface nanostructuring; and (iii) topic of this particular review, surface modification with controllably changing its characteristics for advanced applications. It is important to know what can happen and which parameters should be taking into account in the case of surface modification when actually the aim is solely cleaning or aim is surface nanostructuring. Nanostructuring should be taking into account since is often accidentally applied in cleaning. Surface hydrophilicity, stability to Red/Ox reactions, adhesion of surface layers to substrate, stiffness and melting temperature are important to predict the ultrasonic influence on a surface and discussed from these points for various materials and intermetallics, silicon, hybrid materials. Important solid surface characteristics which determine resistivity and kinetics of surface response to ultrasonic treatment are discussed. It is also discussed treatment in different solvents and presents in solution of metal ions.
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Affiliation(s)
- Ekaterina V Skorb
- Max Planck Institute of Colloids and Interfaces, Wissenschaftspark Golm, Am Mühlenberg 1, Golm 14424, Germany.
| | - Helmuth Möhwald
- Max Planck Institute of Colloids and Interfaces, Wissenschaftspark Golm, Am Mühlenberg 1, Golm 14424, Germany
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11
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Skorb EV, Andreeva DV. Self-healing properties of layer-by-layer assembled multilayers. POLYM INT 2015. [DOI: 10.1002/pi.4899] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ekaterina V Skorb
- Max Planck Institute of Colloids and Interfaces; DE-14424 Potsdam Germany
| | - Daria V Andreeva
- Physical Chemistry II; University of Bayreuth; DE-95440 Bayreuth Germany
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12
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Chen CY, Wong CP. Shape-diversified silver nanostructures uniformly covered on aluminium micro-powders as effective SERS substrates. NANOSCALE 2014; 6:811-816. [PMID: 24258012 DOI: 10.1039/c3nr04956f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Highly-sensitive, reliable and reproducible Raman-active substrates via a facile and organic-free method are reported. These intriguing hierarchical structures are formed through the uniform incorporation of silver (Ag) nanoflowers with aluminium (Al) micro-supporters. The underlying mechanism is systematically investigated, visualizing that the solvents used in galvanic displacement have a major effect on diversifying the reaction kinetics of Ag deposition. Moreover, the exploration of AgNO3 concentrations reveals a drastic transition of Ag morphologies, driven by the elimination of high-energy surfaces of Ag. In addition, the surface-modified Al@Ag structures with octadecyltrichlorosilane demonstrate both the non-wetting (contact angle = 157.2°), as well as easy droplet roll-off (contact angle hysteresis = 5.4°) characteristics, which further enables the tested targets to avoid being pinned at a static position upon detection. Finally, we find that the Ag nanoflower surfaces are corrugated with numerous nanogaps at interparticle sites, in such a way that allows the abundant active sites (referred to as "hot spots") to amplify the Raman signal, and simultaneously maintain the sound reliability and reproducibility of Raman detection. These designs along with the fabrication strategy are anticipated to benefit versatile optical, optoelectronic and energy devices.
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Affiliation(s)
- Chia-Yun Chen
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332, USA.
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Mueller M, Tebbe M, Andreeva DV, Karg M, Alvarez Puebla RA, Pazos Perez N, Fery A. Large-area organization of pNIPAM-coated nanostars as SERS platforms for polycyclic aromatic hydrocarbons sensing in gas phase. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:9168-9173. [PMID: 22381053 DOI: 10.1021/la300454q] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Here, a new surface enhanced Raman spectroscopy (SERS) platform suitable for gas phase sensing based on the extended organization of poly-N-isopropylacrylamide (pNIPAM)-coated nanostars over large areas is presented. This system yields high and homogeneous SERS intensities, and simultaneously traps organic chemical agents as pollutants from the gas phase. pNIPAM-coated gold nanostars were organized into parallel linear arrays. The optical properties of the fabricated substrates are investigated, and applicability for advanced sensing is demonstrated through the detection in the gas phase of pyrene traces, a well-known polyaromatic hydrocarbon.
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Affiliation(s)
- Mareen Mueller
- Physical Chemistry II Department, University of Bayreuth, 95440, Bayreuth, Germany
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Gensel J, Borke T, Pérez NP, Fery A, Andreeva DV, Betthausen E, Müller AHE, Möhwald H, Skorb EV. Cavitation engineered 3D sponge networks and their application in active surface construction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:985-9. [PMID: 22311436 DOI: 10.1002/adma.201103786] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Indexed: 05/08/2023]
Abstract
The design of the 3D architecture surfaces with both space- and time-dependent functionality (cell attraction, pH-trigged self-cleaning, antiseptic/disinfection) is in the focus. The innovative story includes: sonochemical surface activation, formation of feedback surface component (pH-responsible micelles), proof of responsive activity (time resolved cell adhesion and bacteria deactivation) and space adhesion selectivity (surface patterning).
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Affiliation(s)
- Julia Gensel
- Physical Chemistry II, University of Bayreuth, Universitätstrasse 30, Bayreuth, Germany
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