Abstract：
The convenience and high efficiency of recently developed I-III-VI group AgInS2 (AIS) fluorescence sensors have garnered considerable attention. In this study, glutathione (GSH) was employed as a stabilizer to synthesize Mn doped AgInS2 quantum dots (Mn-AIS QDs) via a one-step hydrothermal method at a lower temperature. The resultant samples displayed favorable photoluminescent characteristics and excellent water dispersibility. The photoluminescence of Mn-AIS QDs is quenched by Fe (III) via a photo-induced electron transfer mechanism (PET), and this quenching can be reversed by ascorbic acid (AA) as a result of the redox reaction between the Mn-AIS-Fe (III) complex and AA. Utilizing the on-off-on fluorescence principle, a fluorescence switch sensor based on Mn-AIS QDs was developed for the detection of Fe (III) and AA. The linear range for the detection of Fe (III) using the Mn-AIS QDs sensor was established to be 0.03-120 µM, with a detection limit (LOD) of 0.16 nM. For the detection of AA within the Mn-AIS-Fe (III) system, the linear range spanned from 0.05 to 180 µM, with a LOD of 0.031 µM. Both Mn-AIS and Mn-AIS-Fe (III) demonstrated robust anti-interference properties, facilitating the accurate detection of Fe (III) in tap water and AA in vitamin C tablets. This approach is notable for its simplicity, cost-effectiveness, and considerable potential for application in the creation of innovative biological and environmental sensors.
摘要：
最近开发的I-III-VI族AgInS2（AIS）荧光传感器的便利性和高效性引起了人们的广泛关注。在这项研究中,以谷胱甘肽（GSH）为稳定剂，通过一步水热法在较低温度下合成Mn掺杂的AgInS2量子点（Mn-AISQDs）。所得样品显示出良好的光致发光特性和优异的水分散性。Mn-AIS量子点的光致发光由Fe（III）通过光诱导电子转移机制（PET）猝灭，由于Mn-AIS-Fe（III）络合物与AA之间的氧化还原反应，抗坏血酸（AA）可以逆转这种猝灭。利用开-关-开荧光原理，开发了一种基于Mn-AIS量子点的荧光开关传感器，用于检测Fe（III）和AA。使用Mn-AISQDs传感器检测Fe（III）的线性范围为0.03-120µM，检测限(LOD)为0.16nM。对于Mn-AIS-Fe(III)系统中AA的检测，线性范围从0.05到180µM，LOD为0.031µM。Mn-AIS和Mn-AIS-Fe（III）均表现出强大的抗干扰性能，便于准确检测自来水中的Fe（III）和维生素C片中的AA。这种方法以其简单而著称，成本效益，以及在创建创新的生物和环境传感器方面的巨大应用潜力。
