Sahu Mamta, Ganguly Mainak, Sharma Priyanka
Solar Energy Conversion and Nanomaterials Laboratory, Department of Chemistry, Manipal University Jaipur Dehmi Kalan Jaipur 303007 Rajasthan India
RSC Adv. 2025 May 8;15(19):14767-14777. doi: 10.1039/d5ra00788g. eCollection 2025 May 6.
Herein, silver-enhanced fluorescence was obtained using a small molecule of salicylaldehyde (SL) in an alkaline solution in the presence of silver nitrate. Ag was reduced to Ag, while SL was oxidized to the quinone form OSL. OSL was a very weak fluorophore and exhibited metal-enhanced fluorescence (MEF) in the presence of proximal silver nanoparticle surfaces. MEF was selectively quenched by gallic acid and restored by Cd. Thus, a dual-sensing platform was obtained for gallic acid [limit of detection (LOD) = 1.77 × 10 M; linear detection range = 10 to 5 × 10 M)] and Cd (LOD = 2.4 × 10 M; linear detection range = 5 × 10 to 10 M) in a one-pot. The observed lightning rod effect and higher radiative decay rate were ascribed to MEF, while replacing the capping agents was responsible for the tuning of MEF. The sensing protocol was applied to natural samples from real sample sources, and satisfactory results were obtained.
在此，在碱性溶液中，于硝酸银存在的情况下，使用小分子水杨醛（SL）获得了银增强荧光。Ag被还原为Ag，而SL被氧化为醌形式的OSL。OSL是一种非常弱的荧光团，在近端银纳米颗粒表面存在时表现出金属增强荧光（MEF）。MEF被没食子酸选择性猝灭，并被Cd恢复。因此，获得了一种用于没食子酸[检测限（LOD）= 1.77×10⁻⁸ M；线性检测范围 = 10⁻⁸至5×10⁻⁷ M]和Cd（LOD = 2.4×10⁻⁷ M；线性检测范围 = 5×10⁻⁷至10⁻⁶ M）的一锅法双传感平台。观察到的避雷针效应和更高的辐射衰减率归因于MEF，而更换封端剂则负责MEF的调节。该传感方案应用于来自实际样品源的天然样品，并获得了满意的结果。
