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Graphene quantum dots from fishbone carbon nanofibers

机译:石墨烯量子点来自鱼骨碳纳米纤维

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摘要

Graphene oxide quantum dots (GOQD) were obtained from fishbone carbon nanofibers (CNF) using a modified Hummers' method followed by ultrasound assisted exfoliation. Owing to its arrangement in accessible small sp(2)-carbon domains, CNF is a promising precursor for high yield GOQD obtention. The suspension was subjected to further separation by degressive differential centrifugation obtaining fractions of different sizes and oxidation states. The resulting graphene oxide-based products consisted of a mixture of expanded CNF, few-layer graphene oxide sheets and GOQD, the latter accounting for a yield of 42 wt% with respect to the initial CNF weight. The photoluminescence properties were dependent on the size and the oxidation state of each fractionated graphene oxide-based suspension. GOQD showed an excitation-dependent photoluminescent emission with a maximum at 578 nm (yellow) for an excitation of 455 nm. After hydrothermal reduction, reduced GOQD (rGOQD) exhibited bright violet photoluminescence at 448 nm for 330 nm of excitation due to the removal of hydroxyl and epoxide groups from basal planes of the graphene network. Furthermore, the quantum yield of GOQD and rGOQD were measured and reached values of 5.5 and 7%, respectively.
机译:使用改进的悍马的方法从鱼骨碳纳米纤维(CNF)中获得石墨烯氧化物量子点(GOQD),然后通过超声辅助剥离。由于其在Accessible Small SP(2) - 碳结构中的布置,CNF是高产GOQD获得的有希望的前体。通过消失的差分离心获得不同尺寸和氧化态的脱离差分离心进一步分离悬浮液。所得的石墨烯基产物由膨胀的CNF,几层石墨烯氧化物片和GOQD的混合物组成,后者占初始CNF重量的42重量%的产率。光致发光性质取决于每个分级的石墨烯氧化物基悬浮液的尺寸和氧化状态。 GOQD显示激励依赖性光致发光排放,最大为578nm(黄色),促进455nm。在水热还原后,由于从石墨烯网络的基底除去羟基和环氧化物基团,降低了GoQD(RGoQD),在448nm处表现出330nm激发的亮紫光光。此外,测量GoQD和RGoQD的量子产率和达到5.5%和7%的值。

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  • 来源
    《RSC Advances》 |2016年第54期|共11页
  • 作者单位

    CSIC Inst Carboquim Miguel Luesma Castan 4 Zaragoza 50018 Spain;

    CSIC Inst Carboquim Miguel Luesma Castan 4 Zaragoza 50018 Spain;

    CSIC Inst Carboquim Miguel Luesma Castan 4 Zaragoza 50018 Spain;

    CSIC Inst Carboquim Miguel Luesma Castan 4 Zaragoza 50018 Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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