Aniline as a stabilizer for metal nanoparticles

Athawale, Anjali A.; Bhagwat, Sunita; Katre, Prachi P.; Chandwadkar, A.J.; Karandikar, Prashant R.

doi:10.1016/s0167-577x(03)00235-0

Cited by 46 publications

(24 citation statements)

References 12 publications

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“…[26] Synthesis of metal-nanoparticle-conjugated-polymer matrices has been studied and reported extensively in the literature. Primarily these matrix composites are obtained by one of the following techniques: i) addition of metal flakes to the polymer melt followed by drawing them into thin films, [24] ii) polymerization of the monomer on top of pre-synthesized metal nanoparticles, [27][28] and iii) one-pot synthesis involving the reduction of a metal halide by a monomers or its conjugated oligomer [29] (see the review by Sih and Wolf [30] ). The conductivities of the obtained composites were reported to be about 1 S cm À1 and lower.…”

Section: Introductionmentioning

confidence: 99%

Novel Strategies for the Deposition of COOH Functionalized Conducting Copolymer Films and the Assembly of Inorganic Nanoparticles on Conducting Polymer Platforms

Vaddiraju

Seneca

Gleason

2008

Adv Funct Materials

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A method for the preparation of COOH functionalized conducting copolymer films; toward the ultimate goal of developing resistance‐based sensing platforms, is presented. The method involved vapor phase copolymerization of pyrrole with a monomer containing the COOH functionality, thiophene‐3‐acetic acid (TAA). This copolymerization strategy aided in avoiding the need to employ brittle poly(thiophene‐3‐acetic acid) (PTAA) films in sensing applications. In this strategy, variation in the gas phase feed ratio of pyrrole to TAA allowed for the variation of the composition of the copolymer film and further allowed for the variation of both the conductivity and the amount of COOH functionality in the films. Further, the effect of covalent attachment of silver on the conductivity of the copolymer films is performed and presented. This covalent attachment of silver served the dual purpose of verifying the presence of active COOH groups on the surface, and also allowed for the quantification of the change in conductivity as a result of such attachment. Use of the conjugated ring containing 4‐aminothiophenol as the linker material enhanced the conductivities of the films. In contrast, employing cysteamine to link silver nanoparticles to the copolymer films did not result in any enhancement in the conductivities. An enhancement in the conductivities, ranging from 2 to 1000 times, is observed on covalent attachment of silver nanoparticles to the copolymer films using 4‐aminothiophenol as the linker material. This increase depended on the amount of TAA in the films and increased with increasing concentrations of TAA in the films. These results clearly indicate the use of these copolymer films in resistance‐based sensing. Further, this covalent attachment could be used as a novel strategy to integrate other inorganic nanomaterials on conducting polymer platforms.

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Section: Introductionmentioning

confidence: 99%

Novel Strategies for the Deposition of COOH Functionalized Conducting Copolymer Films and the Assembly of Inorganic Nanoparticles on Conducting Polymer Platforms

Vaddiraju

Seneca

Gleason

2008

Adv Funct Materials

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“…Curves (a) in the figure represent the absorbance of unirradiated solutions showing negligible absorbance. The absorbance was seen to increase with irradiation time and a sharp peak was observed in the range of 430-500 nm Curves (b)-(d) in each case can be attributed to the formation of cobalt oxide 19 surrounded with aniline molecules which stabilise the nanoparticles 20 . Transient spectra of aminyl and amine radical cation have also been reported in the region between 415-430 nm 21 .…”

Section: Results and Discussion 31 Uv-visible Spectroscopymentioning

confidence: 91%

Synthesis of Cobalt Oxide Nanoparticles/Fibres in Alcoholic Medium using y-ray Technique

Athawale¹,

Majumdar²,

Singh³

et al. 2010

DSJ

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Nanoparticles of cobalt oxides were synthesised by steady state g irradiation technique using various alcoholic salt solutions of cobalt ions with aniline acting as a stabiliser. Preliminary results were investigated using UV-vis and Fourier transform infra red analysis. The X-ray diffractograms revealed major peaks at 2 q values of ~ 36.4°, 39.1°, 44.2°, and 65.7° corresponding to the Co 3 O 4 phase and one peak at ~30.7° (100 per cent intensity) for Co 2 O 3 phase. Lower alcohols yielded particles while fibres were formed in higher alcohols as observed from transmission electron microscopic analysis. Iso-propanol was observed to yield cobalt oxide nanoparticles with highest stability, conversion yield and homogeneity in size. The average measured diameter and length of these fibres were ~29 nm and 130 nm respectively. Energy dispersive spectroscopy supports the formation of cobalt oxide. The X-ray photoelectron spectroscopic results for iso-propanol sample show a peak at 781.6 eV confirming the formation of Co 3 O 4 .

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“…An additional important advantage is the opportunity to achieve a homogeneous distribution of the metal particles in three dimensions that is usually not the case for metal deposition in pre-synthesized supported CPs. The synthesis of nanocomposites by means of presynthesized metal NPs has been approached in several ways: by carrying out electrochemical [46][47][48][49][50][51][52][53][54][55][56][57][58][59]70,71] or chemical [60][61][62][63][64][65][66][67][68][69] polymerization in their presence; by simple mixing with dissolved CPs [73][74][75][76]; by NPs adsorption on pre-synthesized CP layers [77][78][79][80][81][82][83]; by layer-by-layer (LbL) adsorption using dissolved CPs [84][85][86][87] (Table 7.2, A and B). The metal colloid preparations are mostly based on reduction of metal ions in the presence of bulky anions (e.g.…”

Section: Nanocomposite Formation By Means Of Pre-synthesizedmentioning

confidence: 99%

Metallic‐Based Nanocomposites of Conductive Polymers

Tsakova

2010

Nanostructured Conductive Polymers

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IntroductionSince the remarkable discovery of high electrical conductivity in polymer materials in 1977 [1], studies on conductive polymers (CP 1 ) have developed into interdisciplinary research expanding in various directions. A significant impetus to the field was given by materials scientists in their attempts to combine the unique properties of conductive polymers with those of other inorganic and organic materials. Thus, in the last two decades, research on the synthesis of CP-based composite materials has flourished and resulted in the development of a great variety of new materials with interesting specifically designed properties. The accumulation of a great number of studies on nanocomposite materials has provoked the recent appearance of several review articles [2-7] attempting to summarize, from different specific points of view, the advances made in the field. Thus, electrochemical aspects [2,7] of CP-based composites, optical and electronic properties [3], polyaniline(PANI)-based nanocomposites [4], the involvement of composites of CPs in chemical sensing [5], and the incorporation of metallocenes in CPs [6] have been extensively discussed.

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Aniline as a stabilizer for metal nanoparticles

Cited by 46 publications

References 12 publications

Novel Strategies for the Deposition of COOH Functionalized Conducting Copolymer Films and the Assembly of Inorganic Nanoparticles on Conducting Polymer Platforms

Novel Strategies for the Deposition of COOH Functionalized Conducting Copolymer Films and the Assembly of Inorganic Nanoparticles on Conducting Polymer Platforms

Synthesis of Cobalt Oxide Nanoparticles/Fibres in Alcoholic Medium using y-ray Technique

Metallic‐Based Nanocomposites of Conductive Polymers

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