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Growth of mesoporous silica on both sides of graphene oxide affords a nano-sandwich (NS) material. A two-photon active dye is then loaded into the mesopores of the NS followed by sealing with poly(acrylic acid). The obtained hybrid exhibits low cytotoxicity and excellent capability for two-photon and photoacoustic dual-mode bioimaging.
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Nguyen et al. (2014) studied this question.
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