Hibrid multilayer of zno-sio2/chitosan nanorods by poly(Diallyldimethylammonium chloride) (pdda) and poly(sodium 4-styrenesulfonate) (pss)

Abstract

The core-shell synthesis of SiO2 (shell) and ZnO (core) carried out in a system, involves the use of Poly(diallyldimethylammonium chloride) (PDDA) and Poly(sodium 4-styrenesulfonate) (PSS) compounds as a crosslinker. Also, ZnO-SiO2/Chitosan core-shell was synthesized, using the hydrothermal method at a temperature of 180oC, for 24 hours. This study is aimed at optimizing the coating of SiO2 on the surface of ZnO, using the varied composition of PDDA and PSS in the ratio (1:1, 1:2 and 2:1), to the ZnO precursor composition ratio of (1:1). However, the multilayer hybrid process is carried out in stages: O-Zn-O/PDDA/PSS/O-Si-O. This method resulted in a corresponding increase in layer formation due to a higher PDDA composition ratio of (2:1), thus leading to greater SiO2 covering on the surface of ZnO (core-shell ZnO-SiO2). This was indicated by a relatively smaller crystal size of 30.08 nm, with hexagonal wurtzite structure at 2θ = 3˚, 34˚, 36˚, and hkl [1 0 0] [0 0 2] and [1 0 1], based on JCPDS36-1451 standards. Furthermore, dinalysis nanorod pattern evaluated using SEM-EDX morphology shows the following composition elements: N, O, Si and Zn with the relative mass percentage of 11.40%, 47.93%, 0.67%, and 40%, respectively. Subsequently, BET/BJH analysis identified a correlation between the smaller crystal sizes and the greater surface area (126.271 m2/g).