Introduction of Ag and Ag2S Nanoparticles into Nylon 6 Film and Fiber

Abstract

ABSTRACT:Nylon 6 doped with Ag nanoparticles (nylon 6/Ag) was prepared by immersion of nylon 6 in aqueous AgNO 3 solution followed by reductive treatment by heating under H 2 gas or immersing in an aqueous NaBH 4 solution. As a result of either reductions, Ag nanoparticles below 10 nm in diameter were successfully dispersed within the nylon 6 matrix. The Ag content and the dispersion state of the Ag nanoparticles can be varied by the concentration of the AgNO 3 solutions and the reduction methods, respectively. From the results of the absorbed Ag + content in nylon 6via immersion in AgNO 3 solution, nylon 6 was found to have some affinity for silver ion. Nylon 6 doped with Ag 2 S nanoparticles (nylon 6/Ag 2 S) was also prepared by immersion in AgNO 3 aqueous solution and the following immersion of Na 2 S aqueous solution. Ag 2 S particles having several nanometers in diameter were dispersed in nylon 6. The nylon 6/Ag 2 S film showed strong photoluminescence in the near infrared region. KEY WORDS Nylon 6 / Ag / Ag 2 S / Nanocomposite / Nanoparticle / Organic/inorganic composite materials consisting of polymers doped with metal or semiconductor nanoparticles, which possess characteristic optical properties, such as non-linear optical and laser amplification properties, have attracted increasing interest for potential application as novel photonics devices. [1][2][3][4] In contrast to inorganic matrices such as glasses or ceramics, the use of organic polymers as a matrix has the advantages of processability and ease of handling of the composite materials. 2 Specifically, the polymer matrices can be molded at lower temperatures, are generally flexible, and show higher toughness than inorganic matrices. Furthermore, various inorganic compounds for doping components can be readily introduced in the polymer matrices using in-situ reactions under mild conditions. 2

In situ formation of silver nanoparticles within an amphiphilic graft copolymer film

“…However, after UV irradiation, one strong UV absorption peak was observed, centered at 410 nm for AgBF 4 and 420 nm for AgNO 3 , corresponding to the plasmon excitation of silver nanoparticles. It is generally accepted that the absorption peak whose maximum occurs at around 410–420 nm is related to the formation of silver metal nanoparticles 13–19. It is also known that its magnitude correlates to the concentration of silver nanoparticles while the peak position is related to the size of silver nanoparticles 24–26.…”

“…A number of methods have been developed for synthesizing silver nanoparticles, primarily based on a solution synthesis containing liquid medium, reductants, and surfactants. However, silver nanoparticles can be also prepared by the in situ reduction of silver ions within a polymer matrix using H 2 gas,13 heat treatment,14, 15 NaBH 4 solution,16, 17 and γ‐/ultraviolet irradiation 18, 19…”

Conductivity and structure of a polyamide/silver iodide nanocomposite

“…24 For example, the transition temperature of β-AgI to α-AgI for the composite was more than 20 °C lower than that of bulk AgI (147 °C). The ionic conductivity of the composite was much higher than that of pure β-AgI or γ-AgI, although the volume fraction of AgI in the insulating nylon 6 matrix was only about 20%.…”

“…[15][16][17][18][19] We have reported preparative methods and optical properties for some nanocomposites with nanoparticles (e.g., silver metal, silver sulfide, copper sulfide and copper iodide) introduced into a matrix of nylon 6 or polyacrylic acid. [20][21][22] AgI is an attractive inorganic compound, and thus it is considered that AgI is a good candidate as a component of a nanocomposite material. Composites with AgI introduced into an inorganic matrix have been reported; for example, AgI nanoparticles were precipitated in-situ in nanopores of alumina prepared by the anodizing process.…”

Synthesis of amphiphilic triblock copolymers for the formation of magnesium fluoride (MgF2) nanoparticles

“…Polymer nanoparticle composites can be prepared by several methods including dispersion,6, 7 immersion,8, 9 and deposition 10, 11. In the dispersion route, the metal precursors are mixed with a polymeric stabilizer, and then the metal precursors are reduced into metal nanoparticles.…”