Engineering graphene/quantum dot interfaces for high performance electrochemical nanocomposites in detecting puerarin

Zhang, Hucheng; Shang, Yingying; Zhang, Ting; Zhuo, Kelei; Wang, Jianji

doi:10.1016/j.snb.2016.11.082

Cited by 12 publications

(7 citation statements)

References 39 publications

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“…Covalent surface modifications of graphene oxides are confirmed by FTIR study (Figure S7). The as-synthesized GO exhibits bands at 1042 and 1405 cm –1 , which are ascribed to the epoxy C–O stretching and O–H deformation vibration, respectively . After modification with imidazole, a new vibration band appears at 1156 cm –1 , which suggests the C–N stretching vibration band arising from imidazolium ring .…”

Section: Results and Discussionmentioning

confidence: 98%

“…The as-synthesized GO exhibits bands at 1042 and 1405 cm −1 , which are ascribed to the epoxy C−O stretching and O−H deformation vibration, respectively. 63 After modification with imidazole, a new vibration band appears at 1156 cm −1 , which suggests the C− N stretching vibration band arising from imidazolium ring. 64 The FT-IR data ensures the successful covalent attachment of imidazole moiety to GO nanosheets.…”

Section: ■ Characterizationmentioning

confidence: 98%

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Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu₇L₃) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

et al. 2017

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Luminescent copper nanoclusters (Cu NCs) have emerged as fascinating nanomaterials for potential applications in optoelectronics, catalysis, and sensing. Here, we demonstrate the synthesis of L-cysteinecapped Cu NCs in aqueous medium having a bright cyan emission (489 nm) with a quantum yield of 6.2%. The structure of the Cu NCs (Cu 7 L 3 ) is investigated by using density functional theory (DFT) calculation and mass spectrometric study. Further, time-dependent density functional theory (TD-DFT) calculations provide the insights of electronic transitions, and it is correlated with experimental data. With near-HOMO−LUMO gap excitation, Cu NCs are excited to the S 4 state and subsequently relaxed to the S 1 state through an internal conversion process with a time scale in the ultrafast region (326.8 ± 6.5 fs). Furthermore, the structural relaxation in S 1 takes place at a picosecond time scale, and the radiative relaxation occurs from S 1 to S 0 . Finally, Cu NCs are attached with imidazole-functionalized partially reduced graphene oxide (ImRGO) via electrostatic attraction. A dramatic photoluminescence (PL) quenching and shortening of the decay time of the Cu cluster in the presence of ImRGO indicate the photoinduced electron transfer process, which is confirmed from ultrafast spectroscopic study. The photoinduced electron transfer in a Cu NC−ImRGO nanocomposite should pave the way for potential applications in light harvesting.

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Section: Results and Discussionmentioning

confidence: 98%

Section: ■ Characterizationmentioning

confidence: 98%

Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu₇L₃) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

et al. 2017

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“…The amimRG sheets provide many scaffolds to land Pd x Ag y @[C 2 mim]BH 4 NPs by the electrostatic interactions, π–π stacking, and hydrogen bonding of imidazolium cations with the BH 4  capped NPs, and the nanocomposites of Pd x Ag y @[C 2 mim]BH 4 -amimRG are readily prepared by mixing one component with the other. As observed from the TEM image of Pd 1 Ag 2 @[C 2 mim]BH 4 -amimRG nanocomposite (Figure S4), the bimetallic NPs could be well spread over the amimRG sheets.…”

Section: Resultsmentioning

confidence: 99%

“…All reagents were used as received without further purification. amimRG was synthesized from the single layer reduced graphene oxide (RG) that was modified by 1-aminopropyl-3-methylimidazolium bromide ([amim]Br) as reported in our previous work …”

Section: Experimental Sectionmentioning

confidence: 99%

Enhanced Electrocatalytic Activity of Ethanol Oxidation Reaction on Palladium–Silver Nanoparticles via Removable Surface Ligands

Zhang

Shang

Zhao

et al. 2017

ACS Appl. Mater. Interfaces

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This work developed a facile colloidal route to synthesize BH-capped PdAg nanoparticles (NPs) in water using the reducing ionic liquids of [Cmim]BH, and the resulting NPs were prone to form the nanocomposites with [amim]-modified reduced graphene (RG). The removal of the metal-free inorganic ions of BH can create the profoundly exposed interfaces on the PdAg NPs during the electrooxidation, and favor the ethanol oxidation reaction (EOR) in lowering energy barrier. The counterions of [Cmim] can gather ethanol, OH ions, and the reaction intermediates on catalysts, and synergistically interact with RG to facilitate the charge transfer in nanocomposites. The interface-modified RG nanosheets can effectively segregate the PdAg NPs from aggregation during the EOR. Along with the small size of 4.7 nm, the high alloying degree of 60.2%, the large electrochemical active surface area of 64.1 m g, and the great peak current density of 1501 mA cm mg, PdAg@[Cmim]BH-amimRG nanocomposite exhibits the low oxidation potentials, strong poison resistance, and stable catalytic activity for EOR in alkaline media, and hence can be employed as a promising anodic catalyst in ethanol fuel cells.

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“…The prepared NCs show efficient photocatalytic activity for the degradation of the RhB dye and CIP antibiotic under sunlight/ visible light. The present study, along with previous reports on semiconductors 35 and their composites with graphene, 2,11,12,32,33,[35][36][37][38][39][40][41] would open up a new window for the preparation of new graphene-based NCs employing metal-based surface-active ionic liquids for different applications.…”

Section: Discussionmentioning

confidence: 63%

One-pot sustainable preparation of sunlight active ZnS@graphene nano-composites using a Zn containing surface active ionic liquid

et al. 2020

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Engineering graphene/quantum dot interfaces for high performance electrochemical nanocomposites in detecting puerarin

Cited by 12 publications

References 39 publications

Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu₇L₃) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu₇L₃) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

Enhanced Electrocatalytic Activity of Ethanol Oxidation Reaction on Palladium–Silver Nanoparticles via Removable Surface Ligands

One-pot sustainable preparation of sunlight active ZnS@graphene nano-composites using a Zn containing surface active ionic liquid

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Engineering graphene/quantum dot interfaces for high performance electrochemical nanocomposites in detecting puerarin

Cited by 12 publications

References 39 publications

Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu7L3) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu7L3) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

Enhanced Electrocatalytic Activity of Ethanol Oxidation Reaction on Palladium–Silver Nanoparticles via Removable Surface Ligands

One-pot sustainable preparation of sunlight active ZnS@graphene nano-composites using a Zn containing surface active ionic liquid

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Product

Resources

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Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu₇L₃) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide

Ultrafast Relaxation Dynamics of Luminescent Copper Nanoclusters (Cu₇L₃) and Efficient Electron Transfer to Functionalized Reduced Graphene Oxide