One-pot green synthesis of flower-liked Au NP@GQDs nanocomposites for surface-enhanced Raman scattering

Fei, Xixi; Liu, Zhiming; Li, Yi; Yang, Guangcun; Su, Chengkang; Zhong, Huiqing; Zhuang, Zhengfei; Guo, Zhouyi

doi:10.1016/j.jallcom.2017.05.072

Cited by 17 publications

(3 citation statements)

References 45 publications

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“…Therefore, it is anticipated that the GQD–metal nanoparticle composites might be an excellent SERS substrate to obtain uniform signals with high sensitivity. Several works reported the synthesis of GQD–metal nanoparticle composites, ,− but most of them used multistep construction methods which were complex and uncontrollable. Furthermore, many fabricating methods brought about a continuous graphene shell over the metal nanoparticle, with which only molecules having affinity to graphene in solution could be detected, limiting its universality in SERS detection.…”

mentioning

confidence: 99%

Graphene Quantum Dots Wrapped Gold Nanoparticles with Integrated Enhancement Mechanisms as Sensitive and Homogeneous Substrates for Surface-Enhanced Raman Spectroscopy

Miao

Wen

et al. 2019

Anal. Chem.

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Rational engineering of highly stable and Ramanactive nanostructured substrates is still urgently in demand for achieving sensitive and reliable surface-enhanced Raman spectroscopy (SERS) analysis in solution phase. Herein, monodisperse Ndoping graphene quantum dots wrapped Au nanoparticles (Au-NGQD NPs) were facilely prepared, and further their applications as substrates in SERS-based detection and cellular imaging have been explored. The as-prepared Au-NGQD NPs exhibit superior long-term stability and biocompatibility, as well as large enhancement capability due to the integration of electromagnetic and chemical enhancements. The practical applicability of the Au-NGQD NPs was verified via the direct SERS tests of several kinds of aromatics in solution phase. Finite-difference time-domain simulations in combination with density functional theory calculation were also successfully used to explain the enhancement mechanism. Furthermore, the Au-NGQD NPs were conjugated with 4-nitrobenzenethiol (4-NBT, as reporter) and 4-mercaptophenylboronic acid (MPBA, as targeting element) to construct the MPBA/

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mentioning

confidence: 99%

Graphene Quantum Dots Wrapped Gold Nanoparticles with Integrated Enhancement Mechanisms as Sensitive and Homogeneous Substrates for Surface-Enhanced Raman Spectroscopy

Miao

Wen

et al. 2019

Anal. Chem.

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“…), increasing their catalytic effect on various redox reactions [ 77 ]. Besides, GQDs of tunable sizes 2.2–0.3, 2.6–0.2, and 3–0.3 nm can be successfully used as multivalent redox species for the development of electrochemical sensors for the detection of heavy metals [ 78 , 79 ], small organic or inorganic molecules [ 80 , 81 ] and biological molecules [ 82 , 83 , 84 , 85 , 86 ].…”

Section: Gqds Obtained By Ecofriendly Synthesis For Electrochemical Sensorsmentioning

confidence: 99%

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

et al. 2021

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The continuous decrease in the availability of fossil resources, along with an evident energy crisis, and the growing environmental impact due to their use, has pushed scientific research towards the development of innovative strategies and green routes for the use of renewable resources, not only in the field of energy production but also for the production of novel advanced materials and platform molecules for the modern chemical industry. A new class of promising carbon nanomaterials, especially graphene quantum dots (GQDs), due to their exceptional chemical-physical features, have been studied in many applications, such as biosensors, solar cells, electrochemical devices, optical sensors, and rechargeable batteries. Therefore, this review focuses on recent results in GQDs synthesis by green, easy, and low-cost synthetic processes from eco-friendly raw materials and biomass-waste. Significant advances in recent years on promising recent applications in the field of electrochemical sensors, have also been discussed. Finally, challenges and future perspectives with possible research directions in the topic are briefly summarized.

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“…Many reports showed that the photocurrent response in NGQD/metallic NPs was higher than bare metallic NPs, which is mainly due to the charge transfer between the detection molecules and NGQD/metallic NPs can enhance the response signals, and π-π staking between the NGQDs and absorbed molecules can shorten the distance between the molecules and the substrate which will further enhance the detection signals. Moreover, when compared to conventional graphene sheets, nitrogen-doped graphene quantum dots (NGQDs) have larger specific surface areas and more accessible edges, which lead to more effective adsorption of target molecules [ 23 , 24 ]. Therefore, a photo-electrochemical sensing platform of Au nanoparticles (NPs) and NGQDs with making the most use of their quantum effects and local surface plasmon resonance (LSPR) effects would give promising and interesting analysis results.…”

Section: Introductionmentioning

confidence: 99%

Au–Nitrogen-Doped Graphene Quantum Dot Composites as “On–Off” Nanosensors for Sensitive Photo-Electrochemical Detection of Caffeic Acid

Zhao

Zhou

et al. 2020

Nanomaterials

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Herein, gold–nitrogen-doped graphene quantum dot (Au/NGQD) composite modified electrodes were fabricated and applied as “on–off” nanosensors for the photo-electrochemical (PEC) detection of caffeic acid under visible-light irradiation. An effective and simple strategy was established for the preparation of Au/NGQD composites by hydrothermal and calcination methods. Owing to the quantum confinement effect of NGQDs, the local surface plasmon resonance (LSPR) effect of Au nanoparticles (NPs), and the synergistic effect between Au and NGQDs NPs, the Au/NGQDs showed excellent PEC performance, with wide linear concentration ranges (0.11 to 30.25 μM and 30.25 to 280.25 μM), a low detection limit (0.03 μM), excellent sensitivity, and high stability. The present study may provide an advanced strategy for the simple design of Au/NGQD composites to allow their effective application for selective and sensitive sensing of small biological molecules.

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One-pot green synthesis of flower-liked Au NP@GQDs nanocomposites for surface-enhanced Raman scattering

Cited by 17 publications

References 45 publications

Graphene Quantum Dots Wrapped Gold Nanoparticles with Integrated Enhancement Mechanisms as Sensitive and Homogeneous Substrates for Surface-Enhanced Raman Spectroscopy

Graphene Quantum Dots Wrapped Gold Nanoparticles with Integrated Enhancement Mechanisms as Sensitive and Homogeneous Substrates for Surface-Enhanced Raman Spectroscopy

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

Au–Nitrogen-Doped Graphene Quantum Dot Composites as “On–Off” Nanosensors for Sensitive Photo-Electrochemical Detection of Caffeic Acid

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