Rice–Bernasconi Gorkov–Eliashberg Effect of Giant Dielectric Permittivity in Silica-Based Films Containing Interrupted Silver Nanowires

Abstract

Silver nanowires of diameter ~ 5 nm were grown within thick films (0.6 µm thickness) of sol–gel-derived silica-based glasses of composition xAg2O(1 − x)SiO2; x having values of 30 and 40, respectively, by an electrodeposition method. By applying suitable voltage pulses to the composites, interrupted silver nanowires were produced with lengths having values in the range 4000–5000 nm. The samples exhibited dielectric constant with values of the order of 105 and a low dielectric loss (~ 0.01). The dielectric constant values calculated by using Rice–Bernasconi model which originated from Gorkov–Eliashberg theory of metallic nanoparticles were in satisfactory agreement with the experimental results. The present work not only provides strong evidence for the basis of Rice–Bernasconi model but also opens up a simple method to synthesize high dielectric constant materials which will be useful in fabricating devices for very large-scale integration applications, among others.