In this work, a new dual-emission water soluble graphitic carbon [email protected] nanoclusters ([email protected]) nanocomposite is synthesized by a simple method that AuNCs are in-situ grown on the surface of WS-GCN. This composite material emits yellow fluorescence with two emission wavelengths locating at 430 and 520 nm, and of which direct band gap is different from individual WS-GCN. Its fluorescence intensity at 520 nm is quenched rapidly in the presence of ferrous (Fe²⁺) and copper ions (Cu²⁺), and relevant fluorescent color changes from yellow to blue, ascribing to the photo-induced electron transfer (PET) mechanism. Furthermore, a reduction strategy of cysteine can be used to distinguish Fe²⁺ and Cu²⁺. According to this, a new dual-emission [email protected] fluorescent sensor is constructed to detect Fe²⁺ and Cu²⁺ with the detection limit of 1.73 and 3.63 nmol L^-1, respectively. This proposed method not only exhibits highly selective and sensitive for analysis of Fe²⁺ and Cu²⁺ under existence of interfering cations, but possesses excellent performance for detection of trace amounts of Fe²⁺ and Cu²⁺ in environmental water.

在这项工作中，通过在WS-GCN表面上原位生长AuNCs的简单方法，合成了一种新型的双排放水溶性石墨碳[受电子邮件保护的]纳米团簇（[受电子邮件保护的]）纳米复合材料。这种复合材料发出的黄色荧光具有两个分别位于430和520 nm的发射波长，其直接带隙不同于各个WS-GCN。在亚铁（Fe ²⁺）和铜离子（Cu ²⁺）存在下，其在520 nm处的荧光强度迅速淬灭，并且相关的荧光颜色从黄色变为蓝色，这归因于光致电子转移（PET）机理。此外，半胱氨酸的还原策略可用于区分Fe ²⁺和Cu ²⁺。据此，构建了一种新的双重发射[受电子邮件保护的]荧光传感器，可以检测Fe ²⁺和Cu ²⁺，其检测极限分别为1.73和3.63 nmol L ^-1。该方法不仅在干扰阳离子存在下对Fe ²⁺和Cu ^2+的分析具有高度的选择性和敏感性，而且在检测环境水中痕量的Fe ²⁺和Cu ²⁺方面具有优异的性能。