The effect of Ag on the structural, dielectric, linear and third-order nonlinear optical properties of graphitic carbon nitride nanosheets

Abstract

In this work, g-C3N4 and Ag/g-C3N4 nanomaterials were prepared and their structural, dielectric and optical properties are compared. The UV–Vis spectrophotometry, XRD pattern, FESEM image, FTIR spectroscopy, KK method and Z-scan measurements were applied to characterize the obtained nanomaterials. The Z-scan method was used to analyze third-order nonlinearity studies such as the nonlinear refractive (NLR) index, n2, and nonlinear absorption (NLA) coefficient, β by using Nd: YAG laser with 50 mW power at 532 nm under different concentration of Ag/g-C3N4 nanostructure. The impact of concentration on the nonlinear optical (NLO) properties have been investigated in detail. NLO properties of the Ag/g-C3N4 nanostructure are enhanced, reaching values of 2.99 × 10−8 cm2/W and 6.53 × 10−4 cm/W for the third-order NLR and NLA coefficients, respectively. In addition, this material possesses large optical characteristics in the IR region. The complex refractive index and dielectric coefficient of Ag/g-C3N4 nanostructure is investigated. Moreover, the Ag/g-C3N4 nanostructure's IR light responsiveness has significantly improved. The red shifts of longitudinal and transversal frequencies for Ag/g-C3N4 is more visible than g-C3N4. This research might lead to fresh ideas and a new way to make high-stability supported Ag optical devices.