Surfactant-free interfacial growth of graphdiyne hollow microspheres and the mechanistic origin of their SERS activity

Lu Zhang, Wencai Yi, Junfang Li, Guoying Wei, Guangcheng Xi () and Lanqun Mao ()
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Lu Zhang: Chinese Academy of Inspection and Quarantine
Wencai Yi: Qufu Normal University
Junfang Li: Chinese Academy of Inspection and Quarantine
Guoying Wei: China Jiliang University
Guangcheng Xi: Chinese Academy of Inspection and Quarantine
Lanqun Mao: Beijing Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract As a two-dimensional carbon allotrope, graphdiyne possesses a direct band gap, excellent charge carrier mobility, and uniformly distributed pores. Here, a surfactant-free growth method is developed to efficiently synthesize graphdiyne hollow microspheres at liquid‒liquid interfaces with a self-supporting structure, which avoids the influence of surfactants on product properties. We demonstrate that pristine graphdiyne hollow microspheres, without any additional functionalization, show a strong surface-enhanced Raman scattering effect with an enhancement factor of 3.7 × 107 and a detection limit of 1 × 10−12 M for rhodamine 6 G, which is approximately 1000 times that of graphene. Experimental measurements and first-principles density functional theory simulations confirm the hypothesis that the surface-enhanced Raman scattering activity can be attributed to an efficiency interfacial charge transfer within the graphdiyne-molecule system.

Date: 2023
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DOI: 10.1038/s41467-023-42038-3

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