Shahzad Muhammad Khuram, Farooq Usman, Raza Adil, Abbas Ghulam, Ikram Muhammad, Zhang Yundong
Institute of Physics, Islamia University of Bahawalpur, Bahawalnagar Campus Pakistan
National Key Laboratory of Tunable Laser Technology, Institute of Opto-Electronics, Department of Electronic Science and Technology, Harbin Institute of Technology (HIT) Harbin 150080 China
RSC Adv. 2021 Nov 11;11(58):36569-36576. doi: 10.1039/d1ra06336g. eCollection 2021 Nov 10.
In this study, silver (Ag) island modified up-conversion nano-particle (NaGdF:Yb/Tm) thin films were prepared electrostatic layer by layer (LBL) and spin coating techniques. The spectroscopic results indicated that adding Ag nanoparticles could significantly enhance the up-conversion emission of NaGdF:Yb/Tm thin films at 452 nm and 476 nm. The maximum enhancement factor of ∼15.6 was reached at 476 nm. Furthermore, we prepared microfibers from upconverting nanoparticles solution, the application of microfibers as active and passive waveguides was analyzed by observing the performance of microfibers with and without Ag under 980 nm excitation of the laser source. The fluorescence intensity ratio (FIR) method was adopted to evaluate microfiber sensitivity. The intensity-based temperature sensitivity of blue emission from a single microfiber containing up-conversion nanomaterials (NaGdF:Yb/Tm) and Ag nanoparticles reached up to 0.018 K at 310 K compared to 0.0029 K in Ag-free microfiber. Our results suggest that the novel material can be used to construct new nano-thermometers, useful both in biological experiments as well as industrial research.
在本研究中，通过静电层层（LBL）和旋涂技术制备了银（Ag）岛修饰的上转换纳米颗粒（NaGdF:Yb/Tm）薄膜。光谱结果表明，添加银纳米颗粒可显著增强NaGdF:Yb/Tm薄膜在452 nm和476 nm处的上转换发射。在476 nm处达到了约15.6的最大增强因子。此外，我们用上转换纳米颗粒溶液制备了微纤维，通过观察在980 nm激光源激发下有银和无银微纤维的性能，分析了微纤维作为有源和无源波导的应用。采用荧光强度比（FIR）方法评估微纤维的灵敏度。与无银微纤维中0.0029 K相比，含有上转换纳米材料（NaGdF:Yb/Tm）和银纳米颗粒的单根微纤维蓝色发射基于强度的温度灵敏度在310 K时达到0.018 K。我们的结果表明，这种新型材料可用于构建新型纳米温度计，在生物实验和工业研究中都很有用。
