γ-Irradiated PVA/Ag nanocomposite films: Materials for optical applications

UV irradiated PVA–Ag nanocomposites for optical applications

“…To study the refractive index behavior of PVA and its nanocomposites before and after the UV exposure, the values of T and R directly measured from the instrument were used to obtain transmission coefficient (t) for light during single pass through the sample and reflection coefficient (r) at sheet-air interface [7,[9][10], through the following expressions:…”

“…However, most organic polymers have a smaller refractive index due to their conjugated chemical structure. There are several reports available [7][8][9][10][11][12], which show that RI of organic materials can be tuned through various treatments like chemical doping, ion implantation, gamma and UV irradiation, etc. Although, some organic polymers acquire RI higher than that of glass (1.5) but these are usually highly conjugated and aromatic type, e.g.…”

“…Such hybrid nanocomposites conglomerate the advantages of the organic polymers (low weight, flexibility, good impact resistance, and excellent processability) with the novel functional properties of inorganic nanoparticles [9][10]21]. While selecting such hybrid nanocomposite for any specific application, the major challenge lies in the choice of the base polymer, embedded nanoparticles and the size, concentration and distribution of nanoparticles within the polymer matrix.…”

“…As noble metals, like Ag, Au possess high electronic ion polarizability, therefore, incorporating the metal nanoparticles in polymer matrix can be suggested as good strategy for preparing hybrid material having high RI. Moreover, by varying the organic-inorganic phase ratio and post treatments, like irradiation may further provide the benefit for fabricating the adjustable RI material for graded index anti-reflective coatings [9][10] In the present study, PVA-Ag nanocomposites have been synthesized by in-situ synthesis method followed by the exposure with UV irradiation for different times. The…”

Photoluminescence investigations and thermal activation energy evaluation of Fe3+-doped PVA films

“…As an example of new organometallic complexes, we cite transition metal-doped PVA. Recently, many methods are used to alter the PVA properties using transition metals such as nanoparticles embedding [7][8][9] and c-irradiating PVA/metal films [10]. These structures have opened a new gateway to improve the materials performances in many potential applications such as optical devices, biomedical science, coating materials and sensors [11][12][13].…”