分會

第二分會：納米傳感

摘要

本工作基于石墨烯量子點(diǎn)和單寧酸的協(xié)同還原和穩(wěn)定作用，一步法制備得到性質(zhì)穩(wěn)定的納米銀-石墨烯量子點(diǎn)復(fù)合物（AgNPs@GQDs），并建立紫外吸收-熒光雙模式響應(yīng)的過氧化氫檢測新方法。作為一種有效的還原劑，單寧酸可用于AgNPs的生長；氨基化石墨烯量子點(diǎn)（NH2-GQDs）不僅具有良好的熒光性能，同時因其表面具有較多的功能基團(tuán)（如羥基、氨基、羧基等），可作為良好的還原劑和穩(wěn)定劑用于制備AgNPs?；趩螌幩岷褪┝孔狱c(diǎn)的協(xié)同作用，通過原位合成法可制備得到AgNPs@GQDs復(fù)合物，其中復(fù)合物表面的GQDs可保護(hù)AgNPs不發(fā)生聚集或降解，提高其穩(wěn)定性，且AgNPs@GQDs具有典型的紫外吸收特性。同時，由于復(fù)合物內(nèi)部發(fā)生熒光共振能量轉(zhuǎn)移，表面AgNPs@GQDs的熒光被猝滅。在過氧化氫的作用下，AgNPs@GQDs被氧化為銀離子，此時復(fù)合物內(nèi)部的熒光共振能量轉(zhuǎn)移被抑制，釋放出NH2-GQDs，其熒光恢復(fù)。基于此建立了紫外吸收-熒光雙模式檢測過氧化氫的新方法。 In this work, the AgNPs@GQDs nanocomposite is prepared based on the one-pot synergistic in-situ growth of AgNPs on tannic acid and amino functionalized graphene quantum dots (TA-NH2-GQDs) complex. TA is an effective reducing agent for the growth of AgNPs. NH2-GQDs not only exhibit fluorescence performance, but also are rich in hydroxyl, amino and carboxyl groups, serving as reducing agent as well as stabilizer for the growth of AgNPs directly. In addition, the assembled NH2-GQDs protect AgNPs@GQDs from aggregation or degradation and improve the stability to a great extent. The as-prepared AgNPs@GQDs exhibit typical UV-vis absorption, while the fluorescence of the assembled NH2-GQDs is quenched by AgNPs through FRET. In the presence of hydrogen peroxide (H2O2), AgNPs@GQDs undergo a degradation, in which Ag0 is oxidized to Ag+ along with the release of TA and NH2-GQDs. Thus, the FRET in the nanocomposite is suppressed. The typical plasma absorption of AgNPs@GQDs at 412 nm decreases and fluorescence at 450 nm increases gradually, achieving a dual-mode H2O2 nanosensor.

關(guān)鍵詞

石墨烯量子點(diǎn);原位合成銀納米顆粒;雙模式檢測過氧化氫

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