ABSTRACT

The objective of the present investigation is to functionalise nitrogen-doped carbon quantum dots (NCQDs) with hydroxyapatite (HAp) and study photoluminescence of the composites under ultraviolet radiation. NCQDs were prepared from microwave irradiation of 3:1 molar ratio of urea and citric acid mixture at 750 W for ~5 min. HAp was obtained via wet-chemical process from reacting 1 mol of calcium nitrate with 0.6 mol of ammonium dihydrogen phosphate at ~37°C for 15 h under basic pH (<8). NCQDs/HAp was synthesised from the hydrothermal method by mixing 5–15 mL aqueous solution of NCQDs with 1 g of HAp and autoclaving the mixtures at 100°C for 1 hour. The samples were characterised using diffraction, spectroscopic and microscopic techniques. Pure and nanoscale crystalline NCQDs/HAp composites, with an average particle size of 45 nm, were observed. The NCQDs/HAp resulted in higher photoluminescence than the HAp.

摘要

本研究的目的是用羟基磷灰石 (HAp) 对氮掺杂碳量子点 (NCQD) 进行功能化，并研究复合材料在紫外辐射下的光致发光。NCQDs 由 3:1 摩尔比的尿素和柠檬酸混合物在 750 W 的微波辐射下制备约 5 分钟。HAp 是通过湿化学工艺获得的，即在碱性 pH（<8）下，1 mol 硝酸钙与 0.6 mol 磷酸二氢铵在约 37°C 下反应 15 小时。NCQDs/HAp 由水热法合成，将 5-15 mL 的 NCQDs 水溶液与 1 g HAp 混合，并在 100°C 下高压灭菌 1 小时。使用衍射、光谱和显微技术对样品进行表征。观察到平均粒径为 45 nm 的纯纳米级结晶 NCQDs/HAp 复合材料。