The Poly(Chloro-P-Xylylene)-Ag Metal-Polymer Nanocomposites Obtained by Controlled Vapor-Phase Synthesis for SERS Effect Realisation

Substrates based on the metal-polymer nanocomposites 2,3-dichloro-p-xylylene-silver (PCPX-Ag) that realize the effect of surface-enhanced Raman scattering (SERS) were developed. To obtain nanocomposites, the vapor-phase polymerization method was used (VDP), which makes it possible to control the nanocomposite microstructure. In the process of self-assembly during VDP, nanocomposite films with inclusions of silver particles were formed on the polycore substrates. Silver content varied from 2.5 to 16% vol. The possibility of using such substrates for the detection of low-molecular substances, for example 5,5′-dithiobis- (2-nitrobenzoic acid) (DTNB) analyte, by the SERS method with an enhancement factor of up to 104, was demonstrated. The dependence of the SERS spectra enhancement on the microstructure of the nanocomposite and the silver content was determined. The optical and morphological properties of nanocomposites were also investigated and their dependence on the silver content was shown. It has been demonstrated that the nanocomposite is SERS selective since when working with complex solutions in the presence of high molecular weight substances, signal enhancement was only observed for low molecular weight substances.

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Metal-polymer nanocomposites for integrated microfluidic separations and surface enhanced Raman spectroscopic detection

Journal of Separation Science ◽

10.1002/jssc.200401886 ◽

2004 ◽

Vol 27 (17-18) ◽

pp. 1545-1550 ◽

Cited By ~ 41

Author(s):

R. Maggie Connatser ◽

Lance A. Riddle ◽

Michael J. Sepaniak

Keyword(s):

Polymer Nanocomposites ◽

Raman Spectroscopic ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Microfluidic Separations ◽

Metal Polymer

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Vapor Phase Polymerization Deposition Conducting Polymer Nanocomposites on Porous Dielectric Surface as High Performance Electrode Materials

Nano-Micro Letters ◽

10.1007/bf03353730 ◽

2013 ◽

Vol 5 (1) ◽

pp. 40-46 ◽

Cited By ~ 12

Author(s):

Yajie Yang ◽

Luning Zhang ◽

Shibin Li ◽

Zhiming Wang ◽

Jianhua Xu ◽

...

Keyword(s):

Polymer Nanocomposites ◽

Conducting Polymer ◽

Vapor Phase ◽

High Performance ◽

Electrode Materials ◽

Dielectric Surface ◽

Vapor Phase Polymerization

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Preparation of Fe3O4-Ag Nanocomposites with Silver Petals for SERS Application

Nanomaterials ◽

10.3390/nano11051288 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1288

Author(s):

Thi Thuy Nguyen ◽

Fayna Mammeri ◽

Souad Ammar ◽

Thi Bich Ngoc Nguyen ◽

Trong Nghia Nguyen ◽

...

Keyword(s):

Self Assembly ◽

Hot Spots ◽

Surface Enhanced Raman Spectroscopy ◽

Electrical Field ◽

Stabilizing Agents ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Sers Sensing ◽

Applied Electrical Field ◽

Positively Charged

The formation of silver nanopetal-Fe3O4 poly-nanocrystals assemblies and the use of the resulting hetero-nanostructures as active substrates for Surface Enhanced Raman Spectroscopy (SERS) application are here reported. In practice, about 180 nm sized polyol-made Fe3O4 spheres, constituted by 10 nm sized crystals, were functionalized by (3-aminopropyl)triethoxysilane (APTES) to become positively charged, which can then electrostatically interact with negatively charged silver seeds. Silver petals were formed by seed-mediated growth in presence of Ag+ cations and self-assembly, using L-ascorbic acid (L-AA) and polyvinyl pyrrolidone (PVP) as mid-reducing and stabilizing agents, respectively. The resulting plasmonic structure provides a rough surface with plenty of hot spots able to locally enhance significantly any applied electrical field. Additionally, they exhibited a high enough saturation magnetization with Ms = 9.7 emu g−1 to be reversibly collected by an external magnetic field, which shortened the detection time. The plasmonic property makes the engineered Fe3O4-Ag architectures particularly valuable for magnetically assisted ultra-sensitive SERS sensing. This was unambiguously established through the successful detection, in water, of traces, (down to 10−10 M) of Rhodamine 6G (R6G), at room temperature.

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Substrate wettability guided oriented self assembly of Janus particles

Scientific Reports ◽

10.1038/s41598-020-80760-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Meneka Banik ◽

Shaili Sett ◽

Chirodeep Bakli ◽

Arup Kumar Raychaudhuri ◽

Suman Chakraborty ◽

...

Keyword(s):

Self Assembly ◽

Janus Particles ◽

Water Molecules ◽

Functional Coatings ◽

Hexagonal Close Packed ◽

Local Densities ◽

Inhomogeneous Properties ◽

Metal Polymer ◽

Specific Orientation

AbstractSelf-assembly of Janus particles with spatial inhomogeneous properties is of fundamental importance in diverse areas of sciences and has been extensively observed as a favorably functionalized fluidic interface or in a dilute solution. Interestingly, the unique and non-trivial role of surface wettability on oriented self-assembly of Janus particles has remained largely unexplored. Here, the exclusive role of substrate wettability in directing the orientation of amphiphilic metal-polymer Bifacial spherical Janus particles, obtained by topo-selective metal deposition on colloidal Polymestyere (PS) particles, is explored by drop casting a dilute dispersion of the Janus colloids. While all particles orient with their polymeric (hydrophobic) and metallic (hydrophilic) sides facing upwards on hydrophilic and hydrophobic substrates respectively, they exhibit random orientation on a neutral substrate. The substrate wettability guided orientation of the Janus particles is captured using molecular dynamic simulation, which highlights that the arrangement of water molecules and their local densities near the substrate guide the specific orientation. Finally, it is shown that by spin coating it becomes possible to create a hexagonal close-packed array of the Janus colloids with specific orientation on differential wettability substrates. The results reported here open up new possibilities of substrate-wettability driven functional coatings of Janus particles, which has hitherto remained unexplored.

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Pyrolysis–molecular weight chromatography–vapor-phase infrared spectrophotometry: An on-line system for analysis of polymers. III. Thermal decomposition of polysulfones and polystyrene

Journal of Applied Polymer Science ◽

10.1002/app.1977.070210501 ◽

1977 ◽

Vol 21 (5) ◽

pp. 1159-1176 ◽

Cited By ~ 30

Author(s):

Erdo??an Kiran ◽

John K. Gillham ◽

Edward Gipstein

Keyword(s):

Molecular Weight ◽

Thermal Decomposition ◽

Vapor Phase ◽

Infrared Spectrophotometry ◽

Line System ◽

On Line

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Synthesis of poly(methyl methacrylate)-b-poly(acrylic acid) by DPE method

e-Polymers ◽

10.1515/epoly.2008.8.1.1051 ◽

2008 ◽

Vol 8 (1) ◽

Cited By ~ 2

Author(s):

Dong Chen ◽

Ruixue Liu ◽

Zhifeng Fu ◽

Yan Shi

Keyword(s):

Molecular Weight ◽

Acrylic Acid ◽

Methyl Methacrylate ◽

Diblock Copolymer ◽

Self Assembly ◽

Gel Permeation Chromatography ◽

Amphiphilic Diblock Copolymer ◽

Poly Methyl Methacrylate ◽

Copolymer Poly ◽

Poly Acrylic Acid

AbstractAmphiphilic diblock copolymer poly(methyl methacrylate)-b-poly(acrylic acid) (PMMA-b-PAA) was prepared by 1,1-diphenylethene (DPE) method. Firstly, free radical polymerization of methyl methacrylate was carried out with AIBN as initiator in the presence of DPE, giving a DPE-containing PMMA precursor with controlled molecular weight. tert-Butyl acrylate (tBA) was then polymerized in the presence of the PMMA precursor, and PMMA-b-PtBA diblock copolymer with controlled molecular weight was prepared. Finally, amphiphilic diblock copolymer PMMA-b-PAA was obtained by hydrolysis of PMMA-b-PtBA. The formation of PMMA-b-PAA was confirmed by 1H NMR spectrum and gel permeation chromatography. Transmission electron microscopy and dynamic light scattering were used to detect the self-assembly behavior of the amphiphilic diblock polymers in methanol.

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