Formation of platinum nanoparticles at air–water interfaces by the spontaneous reduction of subphase chloroplatinate anions by hexadecylaniline Langmuir monolayers

Swami, Anita; Kumar, Ashavani; Pasricha, Renu; Mandale, A.B.; Sastry, Murali

doi:10.1016/j.jcis.2003.11.049

Cited by 10 publications

(3 citation statements)

References 39 publications

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“…5,6 The most common method used to synthesize platinum group metal nanoparticles is chemical reduction in a solution using hydrogen gas, [7][8][9][10][11][12][13] alcohols, [14][15][16][17][18][19][20] ethylene glycol, 21 various hydrides [22][23][24] or other reducing agents. 25,26 Platinum group metal nanoparticles can also be produced by electrochemical reduction, 27,28 laser ablation of a platinum metal plate, 29 microemulsion method, 30 aerosol assisted deposition method 31 or partial dissolution of Au-Pt nanoalloys. 32 In our previous work 33 we reported on a novel route for the synthesis of the nanosize particles of metallic palladium based on the precipitation of palladium hydroxide or oxide particles with tetramethylammonium hydroxide (TMAH) at high pH value followed by the hydrothermal processing of the suspensions obtained.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Platinum Group Metal Nanoparticles

Krehula¹,

Musić²

2011

Croat. Chem. Acta

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Abstract. A novel route for the synthesis of platinum group metal nanoparticles has been reported. The synthesis is based on the addition of tetramethylammonium hydroxide (TMAH) to the aqueous PtCl 4 , IrCl 3 or Rh(NO 3 ) 3 solution followed by the hydrothermal treatment of these precipitation systems at 160 ºC. The mean size of nanoparticles was 9.2 nm for platinum, 21 nm for iridium, and 28 nm for rhodium. The average crystallite size was estimated at 7.4 nm for platinum, 3.1 nm for iridium and 3.5 nm for rhodium. The possible mechanism of platinum group metal nanoparticles formation is briefly discussed. (doi: 10.5562/cca1856)

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Platinum Group Metal Nanoparticles

Krehula¹,

Musić²

2011

Croat. Chem. Acta

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“…We thus hypothesized that given its affinity for heavy metal ions, a modified form of GA 3 may be capable of mineralizing metal ions into nanoparticles. It is well known that amines can bind to gold nanoparticles via nitrogen atoms and in some cases also act as mild reducing agents [33]. We therefore chose to explore the potential of amide derivatives of GA 3 by covalently coupling GA 3 either ethylene diamine, or 1,4 diamino butane to the carboxylic acid group of GA 3 by modification of previously established methods [34,35].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of gibberellic amide assemblies and their applications in the growth and fabrication of ordered gold nanoparticles

et al. 2009

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Gibberellins are a group of naturally occurring diterpenoid based phytohormones that play a vital role in plant growth and development. In this work, we have studied the self-assembly of gibberellic acid, a phytohormone, which belongs to the family of gibberellins, and designed amide derivatives of gibberellic acid (GA(3)) for the facile, green synthesis of gold nanoparticles. It was found that the derivatives self-assembled into nanofibers and nanoribbons in aqueous solutions at varying pH. Further, upon incubation with tetrachloroaurate, the self-assembled GA(3)-amide derivatives efficiently nucleated and formed gold nanoparticles when heated to 60 degrees C. Energy dispersive x-ray spectroscopy, transmission electron microscopy and scanning electron microscopy analyses revealed that uniform coatings of gold nanoparticles in the 10-20 nm range were obtained at low pH on the nanowire surfaces without the assistance of additional reducing agents. This simple method for the development of morphology controlled gold nanoparticles using a plant hormone derivative opens doors for a new class of plant biomaterials which can efficiently yield gold nanoparticles in an environmentally friendly manner. The gold encrusted nanowires formed using biomimetic methods may lead on to the formation of conductive nanowires, which may be useful for a wide range of applications such as in optoelectronics and sensors. Further, the spontaneous formation of highly organized nanostructures obtained from plant phytohormone derivatives such as gibberellic acid is of particular interest as it might help in further understanding the supramolecular assembly mechanism of more highly organized biological structures.

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“…These nanoparticles can be easily transferred onto solid substrates by the Langmuir-Blodgett technique to form particulate thin films. Fendler et al made the pioneering work to prepare silver [24] and gold [25] particulate films, and much work on the synthesis of gold [26] and silver [27][28][29] nanoparticles at the air-water interface has emerged gradually. Recently, researchers have developed a facile way to synthesize and fabricate 1D and 2D ordered arrays of nanoparticles at the airwater interface, i.e., one-step synthesis and assembling process through interfacial reactions.…”

Section: Introductionmentioning

confidence: 99%

One-step synthesis of silver nanoparticles at the air–water interface using different methods

et al. 2008

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Silver nanoparticles were synthesized in a one-step process at the air-AgNO(3) aqueous solution interface under Langmuir monolayers of 5,10,15,20-tetra-4-oxy(2-stearic acid) phenyl porphyrin (TSPP) at room temperature by using different methods including UV-light irradiation, ambient light irradiation, and formaldehyde gas reduction. It was found that parallel aligned one-dimensional (1D) chains composed of discrete silver nanoparticles with the size of 3-5 nm were formed under UV-light irradiation for a short time, while large areas of uniform silver spherical nanoparticles were formed under natural daylight illumination for several days or by formaldehyde gas treatment for several hours. The average size of the spherical nanoparticles ranges from 6.88 ± 0.46 to 11.10 ± 1.47 nm, depending on the experimental conditions. The 1D chains formed under UV-light irradiation result from the templating effect of parallel aligned linear supramolecular arrays formed by TSPP at the air-water interface, and rapid nucleation and growth of the nanoparticles. The formation of the uniform silver nanoparticles under daylight illumination or by formaldehyde gas treatment, however, should be ascribed to a kinetically controlled growth process of the nanoparticles.

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Formation of platinum nanoparticles at air–water interfaces by the spontaneous reduction of subphase chloroplatinate anions by hexadecylaniline Langmuir monolayers

Cited by 10 publications

References 39 publications

Hydrothermal Synthesis of Platinum Group Metal Nanoparticles

Hydrothermal Synthesis of Platinum Group Metal Nanoparticles

Self-assembly of gibberellic amide assemblies and their applications in the growth and fabrication of ordered gold nanoparticles

One-step synthesis of silver nanoparticles at the air–water interface using different methods

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