scholarly journals PDMS-Au/Ag Nanocomposite Films as Highly Sensitive SERS Substrates

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1060 ◽  
Author(s):  
Attila Bonyár ◽  
Zsanett Izsold ◽  
Alexandra Borók ◽  
István Csarnovics ◽  
László Himics ◽  
...  
Keyword(s):  
Nitrate Solution ◽  
Composite Films ◽  
Silver Nitrate Solution ◽  
Nanocomposite Films ◽  
Chloroauric Acid ◽  
Technological Parameters ◽  
Simple Method ◽  
Sers Substrates ◽  
Gold Silver

Polydimethylsiloxane (PDMS)–gold/silver nanoparticle composite films were synthetized in situ by using a simple method, which is based on the reduction of chloroauric acid (HAuCl4) or silver nitrate solution (AgNO3) by the PDMS membrane. A method to monitor the development of the plasmonic absorbance peak in situ (during the synthesis of the nanoparticles) is introduced in order to provide a convenient way to investigate the effect of the technological parameters on the position of the resulting peak. The resulting composite films were tested as SERS substrates at two excitation wavelengths (488 nm, 785 nm) and the preliminary results indicate that they are promising candidates for this application, with high sensitivities accompanied by cheap fabrication costs.

Thermally stable polyimide nanocomposite films from electrospun BaTiO3 fibers for high-density energy storage capacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (56) ◽  
pp. 44749-44755 ◽  
Author(s):  
Yun-Hui Wu ◽  
Jun-Wei Zha ◽  
Zhi-Qiang Yao ◽  
Fang Sun ◽  
Robert K. Y. Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Dielectric Properties ◽  
Dispersion Polymerization ◽  
Composite Films ◽  
High Density ◽  
Nanocomposite Films ◽  
Thermally Stable ◽  
Polyimide Nanocomposite ◽  
Polymerization Method

PI composite films with electrospun BT fibers were fabricated using the in situ dispersion polymerization method. The microstructures, thermal and dielectric properties of the BT fibers and composite films were investigated.

scholarly journals Thermal and electrical properties of polyimide/PANI nanofiber composites prepared via in situ polymerization

2018 ◽  
Vol 36 (2) ◽  
pp. 283-287
Author(s):  
Aseel A. Kareem
Keyword(s):  
In Situ Polymerization ◽  
Composite Films ◽  
Nanocomposite Films ◽  
X Ray Diffraction ◽  
Nanofiber Composite ◽  
X Ray ◽  
Thermal And Electrical Properties ◽  
Ft Ir ◽  
Thermal Stability Of

Abstract Polyimide/polyaniline nanofiber composites were prepared by in situ polymerization with various weight percentages of polyaniline (PANI) nanofibers. X-ray diffraction (XRD) and Fourier transform infrared spectra (FT-IR), proved the successful preparation of PANI nanofiber composite films. In addition, thermal stability of PI/PANI nanofiber composites was superior relative to PI, having 10 % gravimetric loss in the range of 623 °C to 671 °C and glass transition temperature of 289 °C to 297 °C. Furthermore, the values of the loss tangent tanδ and AC conductivity σAC of the nanocomposite films were notably higher than those of pure polyimide. The addition of 5 wt.% to 15 wt.% PANI nanofiber filler enhanced the activation energy of PI composites from 0.37 eV to 0.34 eV.

Enhancement of thermal stability and energy storage capability of flexible Ag nanodot/polyimide nanocomposite films via in situ synthesis

2020 ◽  
Vol 8 (36) ◽  
pp. 12607-12614 ◽  
Author(s):  
Shuang Xing ◽  
Zhongbin Pan ◽  
Xiaofeng Wu ◽  
Hanxi Chen ◽  
Xujiao Lv ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Filler Content ◽  
Composite Films ◽  
In Situ Synthesis ◽  
Nanocomposite Films ◽  
Discharge Energy ◽  
Polyimide Nanocomposite ◽  
Discharge Energy Density

Composite films with an ultralow filler content of 0.1 vol% Ag-NDs exhibit an excellent high-temperature discharge energy density of 2.56 J cm−3, together with efficiency exceeding 80% at a temperature of 150 °C.

Preparation of Poly(diallydimethyl ammonium chloride) (PDDA)/Au Nanocomposite Film by In Situ Electrochemical Reduction and its Electrocatalytic Properties

2010 ◽  
Vol 123-125 ◽  
pp. 189-192
Author(s):  
Hong Wei Shi ◽  
Li Zhang ◽  
Cong Wang ◽  
Ke Ying Zhang
Keyword(s):  
Electrochemical Reduction ◽  
Ammonium Chloride ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Layer By Layer ◽  
X Ray ◽  
Assembly Technique

Nanocomposite films containing Au nanoparticles were fabricated by alternating adsorption of poly(diallydimethyl ammonium chloride) (PDDA) and HAuCl4 using layer-by-layer self-assembly technique and subsequent in situ electrochemical reduction of the AuCl4- ions. The composition and properties of the composite films were characterized by ultraviolet-visible spectroscopy (UV-vis), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV).The UV-vis characteristic absorbances of PDDA and Au increase almost linearly with the number of bilayers, which suggests a progressive deposition with almost an equal amount of the PDDA and Au in each cycle. X-ray photoelectron spectroscopy further confirms the presence of the main components (such as PDDA and Au) of the nanocomposite films. Furthermore, the nanocomposite films also exhibit good electrocatalytic activity for the oxidation of ascorbic acid (AA), which may be used in electrochemical biosensors.

Effect of Content and Layer Thickness on the Corona-Resistance of PI/TiO2 Nanocomposite Films

2013 ◽  
Vol 395-396 ◽  
pp. 133-137
Author(s):  
Xing Zhao ◽  
Jin Hua Yin ◽  
Rong Jin ◽  
Jin Yu Dong
Keyword(s):  
Dispersion Polymerization ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Tio2 Content ◽  
Nano Tio2 ◽  
Tio2 Particles ◽  
Layer Composite ◽  
Different Content ◽  
Corona Resistance

Polymer/TiO2 nanocomposite films have good mechanical, electrical and thermal property, which are applied to electrical engineering and microelectronic technique field extensively. Nano-TiO2 has bigger permittivity and better absorption ultraviolet. The PI/TiO2-PI-PI/TiO2 three layer composite films (30mm) with different content and interlayer thickness were prepared via in-situ dispersion polymerization in this paper. And the films with A (5mm), B (10mm) and C (15mm) interlayer PI thickness are divided into three different series. The results show that inorganic TiO2 nanoparticles are well dispersed in the polymer matrices. And the structures of three layers are obvious. The doped nanoparticles don’t affect the imidization of PI matrix in composite films. The time-to-breakdown of all series films increases with the TiO2 content increasing, in which the B series films possess the best performance. Besides, the B series films with 4% doping content are tested with the longest time-to-breakdown, which is three times more than that of pure PI. After corona aging, there are lots of TiO2-particles with the ability of absorbing UV accumulated on the surface of films, playing the role in shielding electric field, which is one factor resulting in improvement of corona-resistance in the composite films.

Particle Size Effect on the Corona Resistant Properties of PI/TiO2 Composite Films

2014 ◽  
Vol 981 ◽  
pp. 914-917
Author(s):  
Guang You Li ◽  
Jing Hua Yin ◽  
Lei Yao ◽  
Xing Zhao
Keyword(s):  
Particle Size ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Particle Size Effect ◽  
Interface Layer ◽  
Nanocomposite Films ◽  
Particle Sizes ◽  
Small Particles ◽  
The Matrix

Polyimide-based (PI) nanocomposites possess excellent electrical and thermal performance, widely used in inverter motor. In the paper using different particle sizes made polyimide/titania (PI/TiO2) nanocomposite films in situ polymerization, including 20nm A series and 50nm B series. The results shows that A series have a larger specific surface, combination of the film and matrix is closer without affecting the imidization of PI, and there is a clear interface layer and the structure is more stable. According to the time of corona-resistant A Series films is significantly longer than B Series films, especially the A series films with 15% of which corona-resistant time is 15h, five times than the pure PI. By both SAXS and XRD particle size in the matrix can be calculated, proving small particles can be better combination of the matrix of PI, increasing the number of traps, more effectively cutting off charge corrosion and making corona resistance greater performance.

scholarly journals In situ synthesis of low-cost and large-scale flexible metal nanoparticle–polymer composite films as highly sensitive SERS substrates for surface trace analysis

RSC Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 2857-2864 ◽  
Author(s):  
Chenghua Zong ◽  
Mengyi Ge ◽  
Hong Pan ◽  
Jing Wang ◽  
Xinming Nie ◽  
...  
Keyword(s):  
Polymer Composite ◽  
Large Scale ◽  
Low Cost ◽  
Composite Films ◽  
In Situ Synthesis ◽  
Metal Nanoparticle ◽  
Sers Substrates ◽  
Highly Sensitive ◽  
Flexible Metal

Facile and large-scale synthesis of flexible metal nanoparticle–polymer composite films as highly sensitive SERS substrates for in situ food inspection.

In Situ Measurement of Elastic Modulus of Individual Layers for Composite Thin Films by MEMS Test Structures

2013 ◽  
Vol 364 ◽  
pp. 248-252 ◽  
Author(s):  
Chao Sun ◽  
Zai Fa Zhou ◽  
Wei Hua Li ◽  
Qing An Huang
Keyword(s):  
Elastic Modulus ◽  
Composite Films ◽  
Rigid Plate ◽  
Simple Method ◽  
Fem Simulations ◽  
Layered Beams ◽  
Cmos Mems ◽  
The Relationship ◽  
Mems Process

In this paper, a direct and simple method to characterize the elastic modulus of individual layers for composite films byin situmeasuring of MEMS test structures is presented. The structure is composed of a set of microactuators which contains a rigid plate with two supporting composite beams. A model is developed to describe analytically the relationship between the force and the deflection of microactuators by electrostatic measurements, and the elastic modulus of multi-layered beams with different widths are evaluated. FEM simulations are implemented to validate the accuracy of the relationship between the on-load voltage and the capacitance between the microactuator and the electrode on the substrate. Test structures are fabricated using CMOS-MEMS process and experiments are to be carried out soon.

scholarly journals In situ fabrication of silver/polyimide composite films with enhanced heat dissipation

RSC Advances ◽  
2021 ◽  
Vol 11 (43) ◽  
pp. 26546-26553
Author(s):  
So Yoon Lee ◽  
Tae-Hwan Huh ◽  
Hye Rim Jeong ◽  
Young-Je Kwark
Keyword(s):  
Chemical Structure ◽  
Heat Dissipation ◽  
Reduction Method ◽  
Composite Films ◽  
Nanocomposite Films ◽  
In Situ Fabrication

The chemical structure and reduction method influence the Ag dispersion in Ag/PI nanocomposite films, resulting in different heat dissipation properties.

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