Synthesis of TiO2 nanosheets/graphene quantum dots and its application for detection of hydrogen peroxide by photoluminescence spectroscopy
Trần Thị Bích Quyên, Ngô Nguyễn Trà My, Duy Toàn Phạm, Đoàn Văn Hồng Thiện
Abstract
TiO2 nanosheets/graphene quantum dots (TiO2 NSs/GQDs) have been successfully developed using a simple and rapid process at 60 °C for 30 min. The GQDs were obtained using a natural source of rice starch and ascorbic acid, a reducing agent, under a rapid and simple microwave-assisted synthetic method for 10 min; and TiO2 NSs were synthesized by hydrothermal method. The synthesized TiO2 NSs/GQDs were characterized by Ultraviolet-visible spectroscopy (UV-vis), Fourier-transform infrared spectroscopy (FTIR), X – ray Diffractometry (XRD), Transmission Electron Microscopy (TEM), and Energy Dispersive X-Ray Analysis (EDX). The novel TiO2 NSs/GQDs were successfully synthesized, possessed an average particle size of ∼10–15 nm (TiO2 NSs) and ∼8–10 nm (GQDs), and were homogenously distributed in the dispersion. Regarding the catalytic application, the TiO2 NSs/GQDs demonstrated high catalytic and photocatalytic activity for the detection of hydrogen peroxide (H2O2) by photoluminescence spectroscopy at an excitation wavelength of 360 nm, with a low H2O2 limit of detection (LOD) of 10−14 M and a wide detection range from 10−14 M to 10−2 M.