1. Multi-optical signal channel gold nanoclusters and their application in heavy metal ions sensing arrays
- Author
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Yihe Wang, Huiting Bi, Chiyang He, Lingfeng Gao, Li Wei, Zhouqing Tan, and Gui Yunyun
- Subjects
Materials science ,Metal ions in aqueous solution ,Analytical chemistry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Luminol ,Nanoclusters ,Metal ,chemistry.chemical_compound ,chemistry ,visual_art ,Reagent ,Materials Chemistry ,visual_art.visual_art_medium ,Naked eye ,0210 nano-technology ,Luminescence - Abstract
To improve the performance of an array-based sensing system, a novel one-pot method was designed to prepare multi-optical signal channel gold nanoclusters (MS-AuNCs), including chemiluminescence (CL) and fluorescence (FL). And multi parameters were extracted from the CL and FL spectra of MS-AuNCs to realize the excellent performance of sensing arrays for heavy metal ion differentiation. In this synthetic strategy, 11-mercaptoundecanoic acid (MUA) was used as the capping agent to form Au(I)–thiol complexes first. Then luminol was introduced as a reductant to reduce the Au(I)–thiol complexes and as a chemiluminescent reagent to form MS-AuNCs. Compared with previous methods for preparing luminescent functionalized nanoparticles, the proposed method could obtain functionalized nanoparticles with multi-optical signal channels in one step and is much simple. The obtained MS-AuNCs exhibited excellent CL performance when reacting with hydrogen dioxide. The peak position of the MS-AuNCs FL emission spectra does not shift as increasing excitation wavelengths. The bright orange FL of MS-AuNCs was strong enough to be seen with naked eye. Based on five parameters extracted from the CL and FL spectra of MS-AuNCs, one sensing array was developed for distinguishing heavy metal ions. The sensing strategy could differentiate seven heavy metal ions with different concentrations, including Al3+, Co2+, Cr3+, Cu2+, Hg2+, Pb2+ and Zn2+. Moreover, novel multi-optical signal channel gold nanoclusters were obtained for the first time in this work, which may find more promising applications in fields such as bioassays and bioimaging.
- Published
- 2021