Hydrothermal synthesis of nitrogen and copper co-doped carbon dots with intrinsic peroxidase-like activity for colorimetric discrimination of phenylenediamine isomers

Lin, Liping; Xiao, Ye; Wang, Yuhan; Zeng, Yongnian; Lin, Zhiping; Chen, Xi

doi:10.1007/s00604-019-3404-y

Cited by 39 publications

(13 citation statements)

References 33 publications

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“…The chemical bonds of copper in Cu-CDs were studied by FTIR (Figure D). The strong absorption peaks at 3423, 3158, 1675, and 1388 cm –1 can be assigned to the stretching vibrations of −OH/NH, OH, CO, and CN groups, , respectively. These hydrophilic groups give Cu-CDs good stability in the water environment.…”

Section: Results and Discussionmentioning

confidence: 99%

Copper Doped Carbon Dots for Addressing Bacterial Biofilm Formation, Wound Infection, and Tooth Staining

Huang

et al. 2022

ACS Nano

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Oral infectious diseases and tooth staining, the main challenges of dental healthcare, are inextricably linked to microbial colonization and the formation of pathogenic biofilms. However, dentistry has so far still lacked simple, safe, and universal prophylactic options and therapy. Here, we report copper-doped carbon dots (Cu-CDs) that display enhanced catalytic (catalase-like, peroxidase-like) activity in the oral environment for inhibiting initial bacteria (Streptococcus mutans) adhesion and for subsequent biofilm eradication without impacting the surrounding oral tissues via oxygen (O 2 ) and reactive oxygen species (ROS) generation. Especially, Cu-CDs exhibit strong affinity for lipopolysaccharides (LPS) and peptidoglycans (PGN), thus conferring them with excellent antibacterial ability against Gram-positive bacteria (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli), such that they can prevent wound purulent infection and promoting rapid wound healing. Additionally, the Cu-CDs/H 2 O 2 system shows a better performance in tooth whitening, compared with results obtained with other alternatives, e.g., CDs and clinically used H 2 O 2 , particularly its negligible enamel and dentin destruction. It is anticipated that the biocompatible Cu-CDs presented in this work are a promising nano-mouthwash for eliminating oral pathogenic biofilms, prompting wound healing as well as tooth whitening, highlighting their significance in oral health management.

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Section: Results and Discussionmentioning

confidence: 99%

Copper Doped Carbon Dots for Addressing Bacterial Biofilm Formation, Wound Infection, and Tooth Staining

Huang

et al. 2022

ACS Nano

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Section: Resultsmentioning

confidence: 99%

“…The results showed that the catalytic activity of the present Au hydrogels (v max ) is comparable and/or higher than those reported metal aerogels fabricated by other approaches. [44,[59][60][61] Even compared with other reported nanozymes, [69][70][71][72][73][74][75] these Au aerogels exhibit a superior peroxidase-like property, which can be attributed to their hierarchical porous structures and abundant catalytically active metal nodes within the 3D networks. In one recent study, Eychmüller et al [44] found that Au(I) species in Au aerogels play an essential role in the catalytic oxidation of TMB, and the aerogel with the most abundant Au(I) species displayed the highest peroxidaselike activity.…”

Section: Peroxidase-like Activity Of Au Aerogelsmentioning

confidence: 96%

Ultrasmall Gold Nanoclusters‐Enabled Fabrication of Ultrafine Gold Aerogels as Novel Self‐Supported Nanozymes

Jia-dong

Sun

et al. 2022

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Metal aerogels represent an emerging type of functional porous materials with promising applications in diverse fields, but the fabrication of metal aerogels with specific structure and property still remains a challenge. Here, the authors report a new approach to fabricate metal aerogels by using ultrasmall metal nanoclusters (NCs) as functional building blocks. By taking D‐penicillamine‐stabilized gold NCs (AuNCs) with a diameter of 1.4 nm as an example, Au aerogels with ultrafine ligament size (3.5 nm) and good enzyme‐mimic properties are synthesized. Detailed characterization shows that the obtained Au aerogels possess typical 3D self‐supported porous network structure with high gold purity and surface area. Time‐lapse spectroscopic and microscopic monitoring of the gelation process reveal that these ultrasmall AuNCs first grow into large nanoparticles before fusion into nanowire networks, during which both pH and the precursor concentration are identified to be the determining factor. Owing to their highly porous structure and abundant metal nodes, these self‐supported Au aerogels display excellent peroxidase‐like properties. This work provides a strategy for fabricating advanced metal aerogels by taking ultrasmall‐sized metal NCs as building blocks, which also opens new avenues for engineering the structure and properties of metal aerogels for further advancing their applications.

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“…The deconvoluted spectra of N1s (Figure 5b) is splitted into four parts at the binding energies 397.8, 399.0, 400.0, and 401.1 eV which may be ascribed to N‐C, C‐N‐C, N‐C, and N‐H. [ 53 ] The peak depicted in the deconvoluted spectra of O1s at 531.3 eV is due to the presence of C‐O‐C/C‐OH (Figure 5c). The peak observed at 102.1 eV in the deconvoluted spectra of Si2p is due to Si‐O‐C (Figure 5d).…”

Section: Resultsmentioning

confidence: 99%

Copper‐triazine‐dendrimer‐functionalized‐graphene oxide: Synthesis, characterization, and application in green synthesis of propargylamines

Kumar

Kujur

et al. 2022

Applied Organom Chemis

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A copper‐triazine‐dendrimer‐functionalized graphene oxide (CTD‐GO) is synthesized for the first time. The structure of the dendrimer is confirmed by Fourier transform infrared (FT‐IR), Fourier transform (FT) Raman, powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), energy‐dispersive X‐ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), high‐resolution transmission electron microscopy (HRTEM), elemental mapping, atomic absorption spectroscopy (AAS), and thermogravimetric analysis (TGA). The catalytic activity of the CTD‐GO is demonstrated in green synthesis of a series of propargylamine derivatives in high yields via A3‐coupling of aldehyde, alkyne, and amine in water. After the reaction, the catalyst was easily recuperated from the reaction mixture and reused up to four times without any significant loss in its catalytic activity. Operational simplicity, high yields of product, use of green solvent, facile recovery and recyclability of the catalyst, and easy workup are the salient features of this procedure.

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Hydrothermal synthesis of nitrogen and copper co-doped carbon dots with intrinsic peroxidase-like activity for colorimetric discrimination of phenylenediamine isomers

Cited by 39 publications

References 33 publications

Copper Doped Carbon Dots for Addressing Bacterial Biofilm Formation, Wound Infection, and Tooth Staining

Copper Doped Carbon Dots for Addressing Bacterial Biofilm Formation, Wound Infection, and Tooth Staining

Ultrasmall Gold Nanoclusters‐Enabled Fabrication of Ultrafine Gold Aerogels as Novel Self‐Supported Nanozymes

Copper‐triazine‐dendrimer‐functionalized‐graphene oxide: Synthesis, characterization, and application in green synthesis of propargylamines

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