scholarly journals Graphene Aerogels for In Situ Synthesis of Conductive Poly(para-phenylenediamine) Polymers, and Their Sensor Application

Micromachines ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 626
Author(s):  
Sahin Demirci ◽  
Mehmet Can ◽  
Nurettin Sahiner
Keyword(s):  
Chemical Reduction ◽  
Fold Increase ◽  
In Situ Synthesis ◽  
Conductivity Measurements ◽  
Co2 Gas ◽  
Graphene Aerogels ◽  
Different Types ◽  
Co2 Detection ◽  
Ft Ir

In this study, macroporous graphene aerogels (GAs) were synthesized by chemical reduction of graphene oxide sheets and were used as a support material for in situ synthesis of conductive poly(para-phenylenediamine) (p(p-PDA)). The in situ synthesis of p(p-PDA) in GA was carried out by using a simple oxidation polymerization technique. Moreover, the prepared conductive p(p-PDA) polymers in the networks of GAs were doped with various types of acids such as hydrochloric acid (HCl), nitric acid (HNO3), sulfuric acid (H2SO4), phosphoric acid (H3PO4), respectively. The prepared GA and different acid-doped forms as GA/p(p-PDA) composites were characterized by FT-IR, TGA, and conductivity measurements. The observed FT-IR peaks at 1574 cm−1, and 1491 cm−1, for stretching deformations of quinone and benzene, respectively, confirmed the in situ synthesis of P(p-PDA) polymers within GAs. The conductivity of GAs with 2.17 × 10−4 ± 3.15 × 10−5 S·cm−1 has experienced an approximately 250-fold increase to 5.16 × 10−2 ± 2.72 × 10−3 S·cm−1 after in situ synthesis of p(p-PDA) polymers and with HCl doping. Conductivity values for different types of acid-doped GA/p(p-PDA) composites were compared with the bare p(p-PDA) and their undoped forms. Moreover, the changes in the conductivity of GA and GA/p(p-PDA) composites upon CO2 gas exposure were compared and their sensory potential in terms of response and sensitivity, along with reusability in CO2 detection, were evaluated.

In situ synthesis of hierarchical CoFe2O4 nanoclusters/graphene aerogels and their high performance for lithium-ion batteries

2015 ◽  
Vol 17 (40) ◽  
pp. 27109-27117 ◽  
Author(s):  
Beibei Wang ◽  
Gang Wang ◽  
Zhengyuan Lv ◽  
Hui Wang
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Solvothermal Method ◽  
Specific Capacity ◽  
Lithium Ion ◽  
In Situ Synthesis ◽  
High Specific Capacity ◽  
Graphene Aerogels ◽  
Excellent Cycling Stability

In this article, we demonstrate a simple solvothermal method towards in situ growth of hierarchical CoFe2O4 nanoclusters on graphene aerogels (GAs). The CoFe2O4/GAs electrode exhibits high specific capacity, excellent cycling stability and superior rate capabilities in both half and full cells.

Synthesis Alloy and Composite Materials of Nano-Silver-Nickel

2014 ◽  
Vol 989-994 ◽  
pp. 181-184
Author(s):  
Wen Jing Cui ◽  
Lin Wang ◽  
Jing Wen Fu ◽  
Dong Yu Zhao
Keyword(s):  
Solid Solution ◽  
Cyclic Voltammetry ◽  
Composite Materials ◽  
Emulsion Polymerization ◽  
Nickel Alloy ◽  
In Situ Synthesis ◽  
Synthesis Conditions ◽  
Alloy Particles ◽  
Ft Ir

In this research, Silver—nickel alloy nanocomposites has been synthesized by reducing mixture solution of Ni2+, Ag+ with hydrazine hydrate as reducer and OP-10 as surfactant. Silver—nickel alloy nanocomposites were characterized by FT-IR, XRD, SEM. And the electrochemical properties of the samples were studied by cyclic voltammetry. Ag-Ni/PANI composites were prepared by in-situ synthesis and emulsion polymerization, and the effect of conduction on the conductivity was investigated including content of alloy. The detailed analysis of the synthesis conditions shows that the reduction takes place in alkaline environment and low-temperature is propitious to generate alloy solid-solution grain. Composites prepared by emulsion polymerization in acidic aqueous solutions synthesis of polyaniline shows higher conductivity than pure polymer, due to the strong interaction between alloy particles and doping PANI.

In Situ Synthesis of PVA-PAA-HA Interpenetrating Composite Hydrogel

2006 ◽  
Vol 309-311 ◽  
pp. 1165-1168 ◽  
Author(s):  
Xiao Min Wang ◽  
Xu Dong Li ◽  
Gui Qiu Zheng ◽  
Jian Ming Jiang ◽  
Ji Yong Chen ◽  
...  
Keyword(s):  
Water Content ◽  
Network Structure ◽  
Calcium Phosphates ◽  
In Situ Synthesis ◽  
Composite Hydrogel ◽  
Poly Vinyl Alcohol ◽  
High Water Content ◽  
Interpenetrating Network ◽  
Ft Ir

A composite hydrogel with interpenetrating network structure was prepared via in-situ synthesis of calcium phosphates during the physical-chemical crosslinking of poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA). The hydrogel water content was tested. Fourier transform infrared absorption spectrum (FT-IR), X-ray diffraction and scanning electron microscopy were employed to evaluate the characteristics of the composite hydrogel. The results showed that the composite hydrogel had high water content and that the inorganic phase was poorly crystalline calcium phosphates. FT-IR confirmed that the interpenetrating network structure was formed between PVA and PAA. The chemical interactions between inorganic and organic phases were further investigated and discussed. The composite hydrogel with an interpenetrating network achieved using the present novel method could be a promising material for tissue engineering.

scholarly journals Gas Sensor based on PANI/Cu-ZnS Porous Micropshere Film for CO2 detection

2020 ◽  
Author(s):  
Hemalatha Parangusan ◽  
Jolly Bhadra ◽  
Zubair Ahmad ◽  
Shoaib Mallick ◽  
Farid Touati ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Gas Sensing ◽  
In Situ Polymerization ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Co2 Gas ◽  
Transmission Electron ◽  
Co2 Detection ◽  
Polymerization Method

In this letter, we report the structural, morphological and CO2 gas sensing properties of the polyaniline (PANI) coated Cu-ZnS microspheres. PANI coated Cu-ZnS microspheres were prepared by hydrothermal and in-situ polymerization method. X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to investigate the structural and morphological properties. The fabricated sensor based on PANI coated Cu-ZnS microspheres exhibits good CO2 sensing performance with rapid response (31 s) and recovery (23 s) times.

Green synthesis of novel in-situ micro/submicron-Cu paste for semiconductor interconnection

2022 ◽  
Author(s):  
Yu Zhang ◽  
Qiang Liu ◽  
Yu Liu ◽  
Jin Tong ◽  
Zhongwei Huang ◽  
...  
Keyword(s):  
Chemical Reduction ◽  
Copper Acetate ◽  
Preparation Process ◽  
Green Method ◽  
Power Semiconductor ◽  
Reducing Atmosphere ◽  
Power Semiconductor Devices ◽  
Reaction Solution ◽  
Different Types

Abstract A green method for the synthesis of in-situ Cu paste is developed. Cu particles are prepared through chemical reduction by selecting a special copper source, reducing agent, and solvent. Then the reaction solution is directly concentrated to obtain an in-situ Cu paste. The synthesis of Cu particles and the preparation of Cu paste are conducted simultaneously, and the process of separation, purification, drying, storage, and re-dispersion of powder are reduced. Particles are not directly exposed to air, thus the oxidation of micro/nano-Cu is effectively prevented, and the agglomeration of particles caused by drying and dispersion operations is simultaneously reduced. Furthermore, the proposed method has a certain universality, and different types of Cu sources can be used to prepare in-situ paste with different sizes and morphologies. The entire preparation process is simple, efficient, green, and the yield can reach 99.99%, which breaks through the bottleneck of the application of traditional micro/nano-Cu materials. Copper acetate based in-situ paste is sintered for 30 min at 260 °C and 2 MPa in a reducing atmosphere. The shear strength, resistivity, and thermal conductivity reach 55.26 MPa, 4.01 × 10-8 Ω·m, and 92.75 W/(m·K), respectively, which could meet the interconnection application of power semiconductor devices.

In-situ synthesis of a novel CaO·4B2O3 · 2H2O–SiO2 nanocomposite and its influence on mechanical property and flame retardancy of polypropylene

2020 ◽  
Vol 10 (2) ◽  
pp. 225-230
Author(s):  
Ping Li ◽  
Hong-Hong Yan ◽  
Zhi-Hong Liu
Keyword(s):  
Mechanical Property ◽  
Thermal Stability ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
In Situ Synthesis ◽  
Physical Mixture ◽  
Fire Performance ◽  
Good Thermal Stability ◽  
Ft Ir

A novel CaO·4B2O3·2H2O–SiO2 nanocomposite with good thermal stability has been in situ synthesized, in which the SiO2 nanospheres are supported on the CaO·4B2O3·2H2O nanosheets. As a comparison, single CaO·4B2O3 ·2H2O nanosheet with the thickness of 100 nm, single SiO2 nanosphere with the diameter of about 100 nm, and their physical mixture were also prepared, respectively. On the basis of characterizations of XRD, FT-IR, TGA, SEM and TEM, the fire performance of CaO·4B2O3 ·2H2O–SiO2 nanocomposite to polypropylene was studied. It is demonstrated that the flame retardancy of prepared sample was prominently stronger than those of single CaO·4B2O3 ·2H2O nanosheet and their physical mixture. Furthermore, the mechanical property of polypropylene/CaO·4B2O3·2H2O–SiO2 composite was also assessed. The possible formation mechanism of the nanocomposite and its flame-retardant mechanism were put forward. It has prospect as possible flame retardant to polypropylene and other polymers.

In situ Synthesis of p–n LaFeO3/ZnIn2S4 Heterojunctions for Enhanced Photocatalytic Activity

NANO ◽  
2019 ◽  
Vol 14 (08) ◽  
pp. 1950096 ◽  
Author(s):  
Wen Gao ◽  
Chengjia Zhang ◽  
Sainan Cui ◽  
Qian Liang ◽  
Song Xu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
In Situ Synthesis ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
Composition Structure

In this study, LaFeO3/ZnIn2S4 composites were synthesized via in situ synthesis. The composition, structure and optical absorption properties of LaFeO3/ZnIn2S4 were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy, fluorescence spectroscopy (PL), Fourier Transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The photocatalytic activity of the LaFeO3/ZnIn2S4 photocatalyst was determined based on the degradation of methyl orange (MO). LaFeO3/ZnIn2S4 composites showed much better photocatalytic performance compared with pure LaFeO3 and ZnIn2S4. The enhanced photocatalytic performance was attributed to intimately contacted interfaces and charge transfer channels which can effectively transfer and separate the photogenerated charge carriers.

Sign in / Sign up

Export Citation Format

Share Document