Functionalized multi-walled carbon nanotubes with strong fluorescence emission

Yin, Yuehong; Cao, Guohua; Fu, Lige; Wei, Zhifei; Li, Haofeng; Wu, Peiji; Li, Ming; Zong, Haitao; Yan, Lingling; Zhang, Baoqing

doi:10.1016/j.jallcom.2020.157016

Cited by 10 publications

(3 citation statements)

References 71 publications

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“…For both MWCNTs and Pyr-loaded MWCNTs, the strong and sharp diffraction peaks appear at around 2θ = 26°and 2θ = 43°, which correspond to the (002) and (101) diffraction planes of hexagonal crystalline graphite in the standard plates, respectively. 43 However, the peak strength of the sample in these two places decreased obviously after drug loading. The weakening of peak strength may be caused by the interaction between drugs and MWCNTs.…”

Section: Resultsmentioning

confidence: 95%

“…X-ray diffraction (XRD) was used to measure the structures of Pyr, MWCNTs, and Pyr-loaded MWCNTs (Figure b). For both MWCNTs and Pyr-loaded MWCNTs, the strong and sharp diffraction peaks appear at around 2θ = 26° and 2θ = 43°, which correspond to the (002) and (101) diffraction planes of hexagonal crystalline graphite in the standard plates, respectively . However, the peak strength of the sample in these two places decreased obviously after drug loading.…”

Section: Results and Discussionmentioning

confidence: 98%

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Crop-Safe Pyraclostrobin-Loaded Multiwalled Carbon Nanotube Delivery Systems: Higher Fungicidal Activity and Lower Acute Toxicity

Tian

Wang

et al. 2022

ACS Agric. Sci. Technol.

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Carbon nanotechnology is a growing research field with applications in electronics, medicine, and engineering. The application of carbon nanomaterials in agriculture has also been explored because of population growth and resource depletion. In this research, fungicide pyraclostrobin (Pyr) was successfully loaded on multiwalled carbon nanotubes (MWCNTs) via a physisorption process, with drug loading up to 16.64% (w/w). Compared with the 97% Pyr technical concentrate (97% Pyr TC), prepared Pyr-loaded MWCNTs had a longer period of sustained release (360 h). The indoor bioassay results showed that the MWCNTs carrier had a certain fungicidal activity against Pyricularia oryzae, and the EC50 of Pyr-loaded MWCNTs against P. oryzae was 0.054 mg/L, which was close to that of 97% Pyr TC (EC50 = 0.065). The nanoparticles could be widely and uniformly distributed on the surface of mycelium and absorbed by the roots of rice. There is a synergistic effect between the carrier and drug molecules. The results of pot experiments showed that the efficacy of the drug-loaded system against rice blast was 86.16% at a concentration of 300 mg/L, which was comparable to the control effect of commercial preparation 9% pyraclostrobin microcapsule suspension (9% Pyr CS). In addition, compared with 97% Pyr TC, its acute toxicity to zebra fish was reduced to 1/80, and the nanocarrier had no negative effect on the germination of rice seeds and the growth of rice seedlings. To sum up, these results suggest that MWCNTs are expected to be a vehicle choice for pesticide delivery systems.

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Section: Resultsmentioning

confidence: 95%

Section: Results and Discussionmentioning

confidence: 98%

Crop-Safe Pyraclostrobin-Loaded Multiwalled Carbon Nanotube Delivery Systems: Higher Fungicidal Activity and Lower Acute Toxicity

Tian

Wang

et al. 2022

ACS Agric. Sci. Technol.

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“…Structurally the small carbon nanoparticles in the length scale of a few nanometers are mostly amorphous, as found experimentally in the X-ray powder diffraction characterization, and/or composed of mixtures with small graphitic fragments or pieces depending on the source and/or processing history of the nanoparticles. Such structurally defective or messy nanoscale carbon particles have been at the center (literally the core) of carbon "quantum" dots or carbon dots, [1][2][3] whose original finding was due largely to their vivid display of bright and colorful fluorescence emissions, [1] similar to but prettier than those associated with the passivated defects in carbon nanotubes [4][5][6][7] and graphene nanosheets. [8][9][10] The sharp contrast between the "ugly" small carbon nanoparticles and their derived beautifully fluorescent carbon dots has prompted some seemingly rather strange interpretations and/or speculations, such as the supernatural stacked graphene sheets in the core of carbon dots or some "surface states" responsible for the observed optical properties of the dots.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dots: Classically Defined versus Organic Hybrids on Shared Properties, Divergences, and Myths

Liang

Sonkar

Saini

et al. 2023

Small

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Carbon dots are defined as small carbon nanoparticles with effective surface passivation via organic functionalization. The definition is literally a description of what carbon dots are originally found for the functionalized carbon nanoparticles displaying bright and colorful fluorescence emissions, mirroring those from similarly functionalized defects in carbon nanotubes. In literature more popular than classical carbon dots are the diverse variety of dot samples from “one‐pot” carbonization of organic precursors. On the two different kinds of samples from the different synthetic approaches, namely, the classical carbon dots versus those from the carbonization method, highlighted in this article are their shared properties and apparent divergences, including also explorations of the relevant sample structural and mechanistic origins for the shared properties and divergences. Echoing the growing evidence and concerns in the carbon dots research community on the major presence of organic molecular dyes/chromophores in carbonization produced dot samples, demonstrated and discussed in this article are some representative cases of dominating spectroscopic interferences due to the organic dye contamination that have led to unfound claims and erroneous conclusions. Mitigation strategies to address the contamination issues, including especially the use of more vigorous processing conditions in the carbonization synthesis, are proposed and justified.

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Correlation between microstructure evolution and fluorescence properties of functionalized multi-walled carbon nanotubes

et al. 2022

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Functionalized multi-walled carbon nanotubes with strong fluorescence emission

Cited by 10 publications

References 71 publications

Crop-Safe Pyraclostrobin-Loaded Multiwalled Carbon Nanotube Delivery Systems: Higher Fungicidal Activity and Lower Acute Toxicity

Crop-Safe Pyraclostrobin-Loaded Multiwalled Carbon Nanotube Delivery Systems: Higher Fungicidal Activity and Lower Acute Toxicity

Carbon Dots: Classically Defined versus Organic Hybrids on Shared Properties, Divergences, and Myths

Correlation between microstructure evolution and fluorescence properties of functionalized multi-walled carbon nanotubes

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