MTA-SZTE Lendület "Momentum" Noble Metal Nanostructures Research Group, University of Szeged, Rerrich B. Sqr. 1, H-6720 Szeged, Hungary.
Interdisciplinary Excellence Center, Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich B. Sqr. 1, H-6720 Szeged, Hungary.
Int J Mol Sci. 2022 Aug 29;23(17):9775. doi: 10.3390/ijms23179775.
A new synthesis method is described for the first time to produce silver nanoclusters (AgNCs) by using the tyrosine (Tyr) amino acid. Several important parameters (e.g., molar ratios, initial pH, reaction time etc.) were optimized to reach the highest yield. The formed Tyr-AgNCs show characteristic blue emission at λem = 410 nm, and two dominant fluorescence lifetime components were deconvoluted (τ1 ~ 3.7 and τ2 ~ 4.9 ns). The NCs contained metallic cores stabilized by dityrosine. For possible application, the interactions with several metal ions from the tap water and wastewater were investigated. Among the studied cations, four different ions (Cu2+, Ni2+, Fe3+, and Rh3+) had a dominant effect on the fluorescence of NCs. Based on the detected quenching processes, the limit of detection of the metal ions was determined. Static quenching (formation of a non-luminescent complex) was observed in all cases by temperature-dependent measurements. The calculated thermodynamic parameters showed that the interactions are spontaneous ranked in the following order of strength: Cu2+ > Fe3+ > Rh3+ > Ni2+. Based on the sign and relations of the standard enthalpy (ΔH°) and entropy changes (ΔS°), the dominant forces were also identified.
首次描述了一种新的合成方法，通过使用酪氨酸（Tyr）氨基酸来制备银纳米簇（AgNCs）。优化了几个重要参数（例如摩尔比、初始 pH 值、反应时间等）以达到最高产率。形成的 Tyr-AgNCs 在 λem = 410nm 处显示出特征性的蓝色发射，并且可以解卷积出两个主要的荧光寿命分量（τ13.7 和 τ24.9ns）。NCs 包含由二酪氨酸稳定的金属核。为了可能的应用，研究了与来自自来水和废水的几种金属离子的相互作用。在所研究的阳离子中，有四种不同的离子（Cu2+、Ni2+、Fe3+和 Rh3+）对 NCs 的荧光有主要影响。基于检测到的猝灭过程，确定了金属离子的检测限。通过温度依赖的测量观察到所有情况下的静态猝灭（形成非发光复合物）。计算的热力学参数表明，相互作用是自发的，强度顺序如下：Cu2+>Fe3+>Rh3+>Ni2+。基于标准焓（ΔH°）和熵变化（ΔS°）的符号和关系，还确定了主要的力。
