Sharma Priyanka, Sahu Mamta, Ganguly Mainak, Doi Ankita
Solar Energy Conversion and Nanomaterials Laboratory, Department of Chemistry, Manipal University Jaipur, Dehmi Kalan, Jaipur, 303007, India.
Department of BioSciences, Manipal University Jaipur, Jaipur-Ajmer Express Highway, Dehmi Kalan, Jaipur, Rajasthan, 303007, India.
Sci Rep. 2025 Jun 4;15(1):19676. doi: 10.1038/s41598-025-04261-4.
A highly fluorescent silver nanostructure was obtained from a commercially available pharmaceutical drug in an alkaline solution. The fluorescence observed was highly selective to Ag⁺, attributed to the in situ formation of Ag⁰ nanostructures. Nanoclusters are usually ≤ 2 nm in size. Microscopic techniques and dynamic light scattering spectroscopy did not find the presence of particles with ≤ 2 nm in our present work. The absence of a plasmon band in absorption spectroscopy and the presence of Ag-Ag in LCMS fragmentations supported the silver giant nanocluster (a larger particle decorating with tiny clusters) with discrete energy levels due to inter-band d-d transition. It ruled out metal-enhanced fluorescence (MEF). Na increased the fluorescence intensity of giant clusters due to the natural crystallization and confinement effect. The influence of heat and sunlight was analyzed before and after Na inclusion. Thus, Ag (linear detection range of 5 × 10 M to 1 × 10 M and limit of detection of 3.6 × 10 M) and Na (linear detection range 10 M to 10 M and limit of detection 7.2 × 10 M) dual sensing was made possible in a single pot. The technique can facilitate sustainable water management to control water pollution.
在碱性溶液中，从一种市售药物中获得了一种高荧光银纳米结构。观察到的荧光对Ag⁺具有高度选择性，这归因于Ag⁰纳米结构的原位形成。纳米团簇的尺寸通常≤2nm。在我们目前的工作中，显微镜技术和动态光散射光谱未发现存在尺寸≤2nm的颗粒。吸收光谱中没有等离子体带以及液相色谱 - 质谱碎片中存在Ag - Ag，支持了银巨型纳米团簇（一种由微小团簇装饰的较大颗粒）由于带间d - d跃迁而具有离散能级。这排除了金属增强荧光（MEF）。由于自然结晶和限制效应，Na增加了巨型团簇的荧光强度。在加入Na之前和之后分析了热和阳光的影响。因此，实现了在一个容器中对Ag（线性检测范围为5×10⁻⁹M至1×10⁻⁷M，检测限为3.6×10⁻¹⁰M）和Na（线性检测范围为10⁻⁸M至10⁻⁶M，检测限为7.2×10⁻⁹M）的双重传感。该技术有助于可持续水管理以控制水污染。
