ชื่อผลงาน : Using thermolytic solution of anionic-decorated graphene quantum dots (GQDs) as fluorescence turn on-off sensor for selective screening test of metal ions.
สถานที่ตีพิมพ์ : Oriental Journal of Chemistry, 2018, 34(1): 55-63.
รายละเอียด : This research was aimed to prepare graphene quantum dots (GQDs) by thermolysis of citric acid using paraffin oil bath, preferably regarding weight of citric acid and heating temperature. Fluorescence spectrum of the blue GQDs solution (under UV light), with excitation ?max 365 nm was characterized. The fluorescence intensity at ?max 460 nm was used to calibrate their uniformity. The as-prepared GQDs were achieved with 0.25 g citric acid at 225 ?C for 5 minutes. The GQDs solution at pH 6-13 gave high fluorescence intensity without any effect of ionic strength and masking agent. Effect of some anionic salts using their corresponding mineral acids (1%, w/w) to decorate the GQDs was investigated. The results showed that each of HCl, HNO3 and H3PO4 enhances its fluorescence intensity of the GQD
