银纳米团簇的双发射荧光纳米探针对 $ Ni^{2+} $的灵敏性检测

金属纳米团簇因其优异的荧光性能受到广泛关注。文章探究由2种银纳米团簇（Ag NCs）构成的双发射荧光纳米探针（His-Ag NCs@DHLA-Ag NCs）对 $ Ni^{2+} $的检测效果。结果表明：在365 nm激发下，探针分别在476、661 nm处显示出2个发射峰；引入 $ Ni^{2+} $后，661 nm处的荧光强度显著降低，而476 nm处的荧光基本保持不变。通过对比2个峰的强度能够实现His-Ag NCs@DHLA-Ag NCs对 $ Ni^{2+} $的特异性、灵敏性检测，检测限为67.3 nmol/L。通过加标回收试验，验证了其在自来水和湖水中对 $ Ni^{2+} $的检测能力，加标回收率为92.00%~103.67%，相对标准偏差为2.17%~4.62%，表明该双发射荧光约束探针对水样中的 $ Ni^{2+} $具有良好的检测前景。

Metal nanoclusters have received much attention due to their excellent fluorescence properties. In this paper, the detection of nickel ions using a dual-emission fluorescent nanoprobe (His-Ag NCs@DHLA-Ag NCs) consisting of two silver nanoclusters (Ag NCs) was explored. This probe showed two emission peaks at 476 nm and 661 nm, respectively, under 365 nm excitation. After the introduction of nickel ions, the fluorescence intensity at 661 nm was significantly reduced, while the fluorescence at 476 nm remained basically unchanged. The specific and sensitivity detection of nickel ions by His-Ag NCs@DHLA-Ag NCs could be realized by comparing the intensities of the two peaks, and the detection limit was 67.3 nmol/L. The ability to detect nickel ions in tap water and lake water was verified by the spiked recovery test, and the spiked recoveries ranged from 92.00% to 103.67% with the relative standard deviations between 2.17% and 4.62%, indicating that the dual-emission fluorescent nanoprobe had a good prospect for the detection of nickel ions in water samples.