Facile one-step fabrication of upconversion fluorescence carbon quantum dots anchored on graphene with enhanced nonlinear optical responses

Zheng, Chan; Huang, Li; Guo, Qiaohang; Chen, Wenzhe; Li, Wei; Wang, Haiyan

doi:10.1039/c8ra00390d

Cited by 26 publications

(8 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The D band corresponds to the vibration peak of the terminal graphite carbon (sp 3 ) planes, and the G band denotes the vibration of the hexagonal lattice of two-dimensional carbon. Moreover, the peak at 3000 cm –1 corresponds to the 2D band that confirms the number of sp 2 layers presented in the CQD . The same type of peaks appeared in the Co 3 O 4 –CQD composite, which proves the carbon network presented in the Co 3 O 4 –CQD composite.…”

Section: Resultssupporting

confidence: 61%

“…Moreover, the peak at 3000 cm −1 corresponds to the 2D band that confirms the number of sp 2 layers presented in the CQD. 57 The same type of peaks appeared in the Co , which has a woven sphere shape, whereas the CQD has a spherical ball-shaped structure. 63 The Co 3 O 4 −CQD has a brush-like structure 64 which is entirely different from Co 3 O 4 , and this structural change is due to CQD acting as a surfactant.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Dual Applications of Cobalt-Oxide-Grafted Carbon Quantum Dot Nanocomposite for Two Electrode Asymmetric Supercapacitors and Photocatalytic Behavior

Shanmugasundaram,

Vellaisamy,

Ganesan

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Carbon materials, such as graphene, carbon nanotubes, and quantum-dot-doped metal oxides, are highly attractive for energy storage and environmental applications. This is due to their large surface area and efficient optical and electrochemical activity. In this particular study, a composite material of cobalt oxide and carbon quantum dots (Co 3 O 4 − CQD) was prepared using cobalt nitrate and ascorbic acid (carbon source) through a simple one-pot hydrothermal method. The properties of the composite material, including the functional groups, composition, surface area, and surface morphology, were evaluated by using various methods such as ultraviolet, Fourier transform infrared, X-ray diffraction, Raman, X-ray photoelectron spectroscopy, Brunauer−Emmett−Teller, scanning electron microscopy, and transmission electron microscopy analysis. The electrochemical performance of the Co 3 O 4 −CQD composite has been studied using a three-electrode system. The results show that at 1 A g −1 , the composite delivers a higher capacitance of 1209 F g −1 . The asymmetric supercapacitor (Co 3 O 4 −CQD//AC) provided 13.88 W h kg −1 energy and 684.65 W kg −1 power density with a 96% capacitance retention. The Co 3 O 4 −CQD composite also demonstrated excellent photocatalytic activity (90% in 60 min) for the degradation of methylene blue dye under UV irradiation, which is higher than that of pristine Co 3 O 4 and CQD. This demonstrates that the Co 3 O 4 −CQD composite is a promising material for commercial energy storage and environmental applications.

show abstract

Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Dual Applications of Cobalt-Oxide-Grafted Carbon Quantum Dot Nanocomposite for Two Electrode Asymmetric Supercapacitors and Photocatalytic Behavior

Shanmugasundaram,

Vellaisamy,

Ganesan

et al. 2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Up to now, some investigations have focused on the nonlinear optical (NLO) properties of CQDs, because CQDs offers the featureless absorption spectra which cause the unique broadband optical power limiting (OPL) possibilities. 14,15 Comparing with other emerging types of nonlinear optical materials (such as MOF, antimonene, MXenes, TiS 2 , and perovskites) [16][17][18][19][20] , CQDs exhibit comparable OPL property. Moreover, CQDs have been regarded as promising candidates in NLO device design because of the presence of abundant delocalized π-electrons, which ensured the materials good nonlinear optical performance.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and sulphur co-doped carbon quantum dots and their optical power limiting properties

Zhu

Wang

et al. 2020

Mater. Adv.

View full text Add to dashboard Cite

show abstract

“…The G-band (sp 2 hybridization) represents the graphitization degree associated with the CNPs, and the D-band (sp 3 hybridization) represents the amount of defect and functionalization. The I G /I D ratio indicates that the synthesized CNPs mainly comprise sp 2 graphitic carbons with sp 3 carbon defects originating from oxygen-containing groups [64][65][66][67] that agree with the negative surface charge of the nanoparticles. SERS results agree with Raman spectra of CDs obtained by other methods [66,68].…”

Section: Resultsmentioning

confidence: 72%

Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component

Chernyakova,

Matulaitienė,

Charkova

et al. 2024

J. Phys. Mater.

View full text Add to dashboard Cite

Alumina/carbon composites are modern nanomaterials used as adsorbents, catalysts, catalyst supports, supercapacitors, and electrode materials for fuel cells. Among other methods, aluminum anodizing is fairly fast and inexpensive for producing anodic alumina/carbon composites with controllable properties. In the present study, the morphology and composition of carbon-enriched anodic alumina films were obtained during aluminum anodic oxidation in formic acid with ammonium heptamolybdate (C content is ca. 5.0 mass%) or oxalic acid (C content 3.4 mass%) additives. The anodic alumina films have a wide blue fluorescence in the 400–650 nm wavelength range with a maximum at ca. 490 nm. The fluorescence decay is nonexponential and has an average lifetime of 1.54 and 1.59 ns for ammonium heptamolybdate and oxalic acid additives, respectively. As samples obtained in sulfuric acid (i.e., without carbon) do not possess detectable fluorescence in the 400–650 nm wavelength range, it was concluded that carbon-containing inclusions are responsible for the fluorescence properties of the films. The initial samples were dissolved in the hot aqueous HCl solution and then dialyzed to extract the carbon-containing component. It was shown that the solutions contain nanoparticles of amorphous carbon with a 20–25 nm diameter. Carbon nanoparticles also exhibit an excitation-dependent emission behavior at 280–450 nm excitation wavelengths with average lifetimes of 7.25–8.04 ns, depending on the composition of the initial film. Carbon nanoparticle fluorescence is caused by the core of CNPs and various emission centers on their surface, such as carbonyl, carboxyl, and hydroxyl groups. As CNPs could be exceptional candidates for detection technologies, the biocompatibility assays were performed with living COS-7 mammalian cells, showing a minimal negative impact on the living cells.

show abstract

Facile one-step fabrication of upconversion fluorescence carbon quantum dots anchored on graphene with enhanced nonlinear optical responses

Abstract: A novel nanocomposite hybrid, carbon quantum dots (CQD)/graphene oxide (GO), which combines the favorable optical properties of both its components, is synthesized by a facile one-step electrochemical method.

Cited by 26 publications

References 52 publications

Dual Applications of Cobalt-Oxide-Grafted Carbon Quantum Dot Nanocomposite for Two Electrode Asymmetric Supercapacitors and Photocatalytic Behavior

Dual Applications of Cobalt-Oxide-Grafted Carbon Quantum Dot Nanocomposite for Two Electrode Asymmetric Supercapacitors and Photocatalytic Behavior

Nitrogen and sulphur co-doped carbon quantum dots and their optical power limiting properties

Anodic alumina/carbon composite films: extraction and characterization of the carbon-containing component

Contact Info

Product

Resources

About