Optical and morphological characterisation of a silver nanoparticle/fluorescent poly(phenylenethynylene) composite for optical biosensors

In Situ Production of Polymer‐Capped Silver Nanoparticles for Optical Biosensing

“…[8] Moreover, while tests performed with the pure polymer showed that the organic compound interacts only with the cell wall of mycelium, we found that the Agcontaining nanocomposite exhibits a strong affinity to both spores and mycelium of the fungus. In this sense, the use of silver, which preserves the fluorescent properties of the poly(phenylene ethynylene), seems to be promising for the development of a biosensors.…”

“…The spectral blue shift had not been observed with nanocomposites prepared by following a fully chemical route. [8] However, in that case, the presence of dodecanthiol as the capping agent for the Ag nanoparticles with no direct coordination of the polymer with the metal, and the reduced particle dimensions impaired significant effect of the metal on the polymer conjugation.…”

“…[4][5][6][7] In this sense, we have recently demonstrated the combined effect of silver nanoparticles produced by chemical reduction and a phenylenethynylene for the detection and attack of fungus Paecilomyces variotii. [8] The chemical synthesis of nanoparticles functionalized with semiconducting polymers usually involves many steps. In some cases, the interaction with the polymer is not direct, but the nanoparticles must be capped with an intermediate thiol-functionalized molecule with subsequent ligand exchange.…”

“…In some cases, the interaction with the polymer is not direct, but the nanoparticles must be capped with an intermediate thiol-functionalized molecule with subsequent ligand exchange. [8] In other cases, the chemical reduction approach can require preliminary functionalization of the nanoparticles with the monomer, which is polymerized during a second step, for example by UV photoirradiation. [2] In contrast, physical methods, such as laser ablation, which represents a fast and easy way for the preparation of metal nanoparticles, [9] can be a convenient alternative to standard chemical reduction techniques for all those applications which require a high level of purity.…”

Nanopartículas de plata: Aplicaciones biomédicas

“…La cantidad de peróxido de hidrogeno se mide registrando el cambio de absorbancia a través del tiempo. Se ha desarrollado un sensor similar para la detección de glucosa [24], en este caso las nanopartículas se sintetizan directamente sobre Julio -Septiembre 2013 una matriz de sol-gel, sobre la cual se inmoviliza glucosa oxidasa para producir peróxido de hidrógeno, este al igual que el ejemplo anterior genera una degradación cambiando las propiedades ópticas del sustrato, este sensor tiene un límite de detección de 23 mg/L.…”