scholarly journals in situ Chemical Synthesis of PANI by Using Aromatic Carboxylic Acid as Dopant for Detection of Ammonia at Room Temperature

2021 ◽  
Vol 33 (8) ◽  
pp. 1805-1810
Author(s):  
Renukacharya Ganapati Khanapure ◽  
Sharad Kashinath Awate ◽  
Suresh Vasant Patil
Keyword(s):  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Room Temperature ◽  
Surface Composition ◽  
Ammonia Gas ◽  
Nitrobenzoic Acid ◽  
Vis Spectroscopy ◽  
Doped Polyaniline ◽  
Methoxybenzoic Acid

In this work, polyaniline (PANI) film was successfully synthesized by in situ chemical polymerization technique by using aromatic carboxylic acids like benzoic acid, p-methoxybenzoic acid and p-nitrobenzoic acid, doped in presence of ammonium persulphate as an oxidant. Electric conductivity study of doped polyaniline has been studied concerning temperature. Surface composition morphology and structure of synthesized carboxylic acid doped polyaniline were characterized via different methods such as the electrical conductivity by two probes, UV-vis spectroscopy, FTIR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The PANI based ammonia gas sensor was synthesized by using, benzoic acid, p-methoxybenzoic acid and p-nitrobenzoic acid as dopant which has excellent selectivity towards NH3 and 28, 426 and 327% response of ammonia gas at 100 ppm concentration, respectively at room temperature.

The role of platinum on the NOx storage and desorption behavior of ceria: An online FT-IR study combined with in situ Raman and UV-Vis spectroscopy

2020 ◽  
Author(s):  
Anastasia Filtschew ◽  
Pablo Beato ◽  
Søren Birk Rasmussen ◽  
Christian Hess
Keyword(s):  
Gas Phase ◽  
Phase Analysis ◽  
Room Temperature ◽  
Storage Mechanism ◽  
In Situ Raman ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ir Study

The role of platinum on the room temperature NOx storage mechanism and the NOx desorption behavior of ceria was investigated by combining online FT-IR gas-phase analysis with in situ Raman...

Green Synthesis of Silk Sericin-Based Silver Nanoparticles

2011 ◽  
Vol 415-417 ◽  
pp. 487-490 ◽  
Author(s):  
Jia Li Ding ◽  
Wen Wu
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Room Temperature ◽  
Reduction Reaction ◽  
In Situ Reduction ◽  
Silk Sericin ◽  
Vis Spectroscopy ◽  
Highly Dispersed ◽  
Average Size

Green synthesis of silver nanoparticles (AgNPs) using the silk sericin (SS) solution by in situ reduction at room temperature is reported. The effect of pH on the reduction reaction is studied by UV-Vis spectroscopy. The structure of the sericin-based silver nanoparticles is characterized by TEM. According to the TEM images, the average size of the silver nanoparticles is about 16 nm. The silver nanoparticles are highly dispersed and stable in silk sericin solution for monthes.

Simultaneous Photocatalytic Abatement of NO and SO2: Influence of the TiO2 Nature and Mechanistic Insights

2021 ◽  
Vol 02 ◽  
Author(s):  
María D. Hernández-Alonso ◽  
Silvia Suárez ◽  
Fernando Fresno ◽  
Juan M. Coronado ◽  
Benigno Sánchez
Keyword(s):  
Photocatalytic Oxidation ◽  
Surface Composition ◽  
Construction Materials ◽  
Morphological Characteristics ◽  
High Specific Surface Area ◽  
Operating Conditions ◽  
Thermal Methods ◽  
Photo Oxidation ◽  
Vis Spectroscopy

Background: TiO2 is currently being incorporated into several construction materials, such as cement and asphalt, because this photocatalyst can act as a passive system to reduce the concentration of typical urban pollutants like NOx and SO2 under solar illumination. Objective: In order to get further insights on the possible influence of the interaction between common pollutants, the present work investigates the mechanism of NOx photo-oxidation in the presence of SO2 traces over TiO2 samples of different textural and morphological characteristics. Methods: The performance on the photo-oxidation of NOx and SO2 in a dry air stream over different TiO2 samples, both commercial and lab-prepared by hydrothermal and thermal methods, were evaluated by means of FTIR analyses of the gas phase. These materials were characterized by XRD, N2 adsorption isotherms and DR UV-vis spectroscopy. Mechanistic studies were performed by in situ DRIFT under UV irradiation. Results: Photocatalytic tests showed a very efficient removal of the two selected pollutants using most of the TiO2 samples. In the case of SO2, elimination of this molecules is due, not only to photocatalytic oxidation, but also in a significant extent to adsorption. Although in shorter periods no by-products are generated, following irradiation for several hours the production of NO2 progressively increases and reaches 100 % selectivity over some photocatalyst. In situ DRIFTS analyses show the evolution of the surface composition and reveal the formation of the different types of surface nitrates with different symmetry. Under these operating conditions, a limited amount of sulfates are also formed. Conclusions: The presence of low concentration of SO2 does not appear to be detrimental for NO removal. NO2 formation is delayed on the TiO2 samples with high specific surface area, which also tend to be more active. The spectroscopic results confirm the involvement of surface hydroxyls on the formation of adsorbed nitrate species.

In Situ Self-Assembled Graphene-Polyaniline Nanocomposite Thin Films for Ammonia Gas Sensor

2014 ◽  
Vol 998-999 ◽  
pp. 63-66
Author(s):  
Ning Jie Guo ◽  
Hui Ling Tai ◽  
Zong Biao Ye ◽  
Guang Zhong Xie
Keyword(s):  
Gas Sensor ◽  
Self Assembly ◽  
Nanocomposite Film ◽  
Graphene Film ◽  
Ammonia Gas ◽  
Assembly Method ◽  
Vis Spectroscopy ◽  
Nanocomposite Thin Films ◽  
Polyaniline Nanocomposite

In this paper, the graphene-polyaniline (PANI) nanocomposite thin film was prepared by the in situ self-assembly method for the ammonia (NH3) gas sensor application, which was characterized by scanning electron microscopy (SEM) and UV-vis spectroscopy. The NH3 sensing performance and mechanism of the nanocomposite film were investigated. The results revealed that the sensor based on graphene-polyaniline nanocomposite film exhibited better sensing properties and restorability than those of single graphene film.

Synthesis of C60-Doped Polyaniline Nanoshuttles

2011 ◽  
Vol 284-286 ◽  
pp. 1010-1013 ◽  
Author(s):  
Qi Guan Wang ◽  
Su Min Wang ◽  
Jian Ping Li ◽  
Hiroshi Moriyama
Keyword(s):  
Interfacial Reaction ◽  
Supramolecular Structure ◽  
Significant Interaction ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
Molar Ratio ◽  
Ammonium Peroxydisulfate ◽  
Vis Spectroscopy ◽  
Amorphous Powders ◽  
Doped Polyaniline

Polyaniline–C60nanoshuttle composites have been successfully synthesized by the oxidative polymerization of aniline with ammonium peroxydisulfate in the presence of C60using an interfacial reaction at room temperature, in which the molar ratio of oxidant to monomer was kept at 0.25:1. The influence of initial C60/aniline molar ratio on the supramolecular structure of the composites was studied. It was found that at low molar ratio (0.01:1) amorphous powders could be synthesized, while the as-synthesized products at the higher molar ratio (0.04:1) were shuttle-like superstructures. FTIR and UV-vis spectroscopy confirmed the presence of C60in the resultant nanocomposite and suggested significant interaction of polyaniline with C60. The evolution of supramolecular structure of polyaniline nanoshuttle–C60nanocomposites was discussed.

scholarly journals Spectroscopic Studies, Thermal Behaviour and Ac Impedance Study of Chemically Synthesized Silver Doped Polyaniline / BaFe12O19 Polymer Composite

2018 ◽  
Vol 7 (4.5) ◽  
pp. 20
Author(s):  
K. Vinay ◽  
K. Shivakumar ◽  
Y. T Ravikiran ◽  
M. Revanasiddappa
Keyword(s):  
Thermal Behaviour ◽  
Room Temperature ◽  
Interfacial Polymerization ◽  
Relaxation Mechanism ◽  
Spectroscopic Studies ◽  
Frequency Range ◽  
Impedance Response ◽  
Ft Ir ◽  
Doped Polyaniline

The present work is a study of a.c impedance response and thermal behaviour of IPANI/Ag/BaFe12O19 (PAB) composites synthesized by in-situ oxidative interfacial polymerization using (NH4)2S2O8 as an oxidizing agent at 0-50C. The synthesized polymer compo- sites were examined by FT-IR, TGA-DTA and DSC techniques. The a.c conductivity properties of the composites were investigated in the frequency range varying from 5x101 – 5x106 Hz at room temperature using HIOKI make 3532-50 LCR Hi-tester. FT-IR profiles confirm the formation of ferrite composite. The endothermic regions in the DTA pattern are consistent with the change regions in the TG curve. The Cole-Cole plots observed in the form of exact semi-circles clearly suggests the Debye-type relaxation mechanism present in these materials.  

Synthesis and Characterization of PANI/Ferric Chloride Composite for Fabrication of Electrodes in Supercapacitor

2013 ◽  
Vol 768 ◽  
pp. 334-337 ◽  
Author(s):  
Deebankarthikeyan Sivalingam ◽  
Hemalatha Elangovan ◽  
Manikandan Subramanian ◽  
Senthil Kumar Kandasamy ◽  
Murugesan Govindasamy
Keyword(s):  
Ferric Chloride ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Supercapacitor Application ◽  
Vis Spectroscopy ◽  
Doped Polyaniline ◽  
Polymerization Method ◽  
Hcl Medium

The main objective of this work is to synthesize polyaniline/ferric chloride composite and to measure the conductivity of the as prepared composite. And also, to analyze the ability of using Ferric Chloride doped polyaniline as an electrode material for the fabrication of supercapacitor application. By in-situ polymerization method, polyaniline in pure form and doped form with the ferric chloride were synthesized using ammonium persulfate as initiator in HCl medium. Polyaniline nanoparticles and its composite are characterized by UV-Vis spectroscopy, FTIR, XRD and Conductivity meter.

Poly (N-ethyl aniline)/Ag Nanocomposite as Humidity Sensor

2017 ◽  
Vol 16 (03) ◽  
pp. 1650037 ◽  
Author(s):  
Nishigandh S. Pande ◽  
Dipika Jaspal ◽  
Jalindar Ambekar
Keyword(s):  
Room Temperature ◽  
Oxidative Polymerization ◽  
Single Step ◽  
Infrared Analysis ◽  
X Ray Diffraction ◽  
Humid Atmosphere ◽  
Vis Spectroscopy ◽  
Uv Visible ◽  
Polymerization Method

Poly (N-ethyl aniline)/Ag organic–inorganic composite has been synthesized by a single step in situ chemical oxidative polymerization method. The synthesis of Poly (N-ethyl aniline)/Ag nanocomposite has been confirmed by X-ray diffraction (XRD), Ultraviolet-Vis Spectroscopy (UV-visible), Fourier transform infrared analysis (FTIR) and FE-SEM investigations. XRD spectral study exhibited major diffraction in the range 20–80[Formula: see text] (2[Formula: see text]) and indicated the semicrystalline nature of poly (N-ethyl aniline)/Ag nanocomposite. Characteristic peaks in UV-visible and FTIR spectra of poly (N-ethyl aniline) switched to higher wave numbers in poly (N-ethyl aniline)/Ag nanocomposite. Peaks at 1789[Formula: see text]cm[Formula: see text], 1595[Formula: see text]cm[Formula: see text], 667[Formula: see text]cm[Formula: see text] and 501[Formula: see text]cm[Formula: see text] in FTIR spectrum confirmed the formation of poly (N-ethyl aniline)/Ag nanocomposite. FE-SEM photographs reported agglomerated granular particulate nature of poly (N-ethyl aniline)/Ag nanocomposite. Synthesized poly (N-ethyl aniline)/Ag nanocomposite exhibited a high response to humidity, good reproducibility and stability at room temperature. An appreciable response was shown in the presence of 40% humid atmosphere for up to successive four cycles. Composite sensitivity has been found to increase with the increasing concentration of humidity, at room temperature.

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