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Deposition and aggregation of β-amyloid (Aβ) peptides are demonstrated to be closely related to the pathogenesis of Alzheimer's disease (AD). Development of functional molecules capable of visualizing Aβ1-40 aggregates with nanoscale resolution and even modulating Aβ assembly has attracted great attention recently. In this work, we use monocyanine fluorophore as the lead structure to develop a set of deep red carbazole-based cyanine molecules, which can specifically bind with Aβ1-40 fibril via electrostatic and van der Waals interactions.