Oxygenated Surface of Carbon Nanotube Sponges: Electroactivity and Magnetic Studies

Cortés-López, Alejandro J.; Muñoz‐Sandoval, Emilio; López–Urías, Florentino

doi:10.1021/acsomega.9b01773

Cited by 13 publications

(11 citation statements)

References 60 publications

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“…SG-2h in benzylamine provokes high O1s to contain in N-MWCNTs which could be very important to electrochemistry studies [89]. This phenomenon has been studied, and it is attributed to the possible oxidation of benzylamine [90,91]. At higher temperatures, this process is less than possible.…”

Section: Xps Characterizationmentioning

confidence: 99%

Pyrrolic nitrogen-doped multiwall carbon nanotubes using ball-milled slag-SiC mixtures as a catalyst by aerosol assisted chemical vapor deposition

Vega-Díaz

González

Morelos-Gómez

et al. 2020

Mater. Res. Express

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We demonstrated that the ball-milled slag-SiC mixture is an effective catalyst to grow pyrrolic nitrogen-doped multiwall carbon nanotubes (N-MWCNTs) by aerosol assisted chemical vapor deposition (AACVD) method. N-MWCNTs synthesized at 800°C, 850°C and 900°C were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, x-ray powder diffraction (XRD), and x-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). TEM characterizations revealed the presence of a bamboolike structure, a typical feature of nitrogen-doped carbon nanotubes. The presence of nitrogen was confirmed by the N1s XPS spectrum. Furthermore, a deconvolution of the N1s spectra revealed the presence of N-pyrrolic defects. This nitrogen functionality is investigated concerning the presence of silicon carbide material. Giant nanotubes with large diameters were obtained when SiC was added to the slag to be used as a substrate for N-MWCNTs synthesis. From Raman spectroscopy, the appearance of the D-band was observed, indicating the presence of topological defects that were also observed by TEM. XRD and TEM characterizations demonstrated the presence of Fe 3 C and α-Fe nanoparticles. The N-MWCNTs fabricated here could be used into (electro)catalytic applications or for reinforcing ceramic nanomaterial or polymers. OPEN ACCESS RECEIVED

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Section: Xps Characterizationmentioning

confidence: 99%

Pyrrolic nitrogen-doped multiwall carbon nanotubes using ball-milled slag-SiC mixtures as a catalyst by aerosol assisted chemical vapor deposition

Vega-Díaz

González

Morelos-Gómez

et al. 2020

Mater. Res. Express

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“…In the deconvoluted O 1 s spectra of CN x and Alg( x )‐CN x , we found the COOH, COC, CO/COO − , and CO (Figure 3c, Table S4, Supporting Information) [29a] . The atomic percentage of CO/(CO) N showed an increment in all Alg( x )‐CN x compared with neat CN x .…”

Section: Resultsmentioning

confidence: 90%

“…The chemical groups found in the XPS high‐resolution spectra for N 1 s of CN x were nitrogen oxide (NO x ), N‐quaternary, N‐pyrrolic, amine or amide groups, and N‐pyridinic (Figure 3b, Table S2, Supporting Information) [29b,31] . The nitrogen‐doping is mainly pyrrolic with an atomic percentage of 0.4% and few N functionalizations.…”

Section: Resultsmentioning

confidence: 99%

“…Following the characterization, we performed high‐resolution scans for C 1 s , N 1 s , and O 1 s . The C 1 s core‐level deconvoluted spectra for the CN x sample showed the chemical groups COOH, CO, CO/CN, C sp 3 /CNH 2 , C sp 2 , and Fe 3 C, iron carbide ( Figure 3 a); [ 29 ] the gravity center, atomic percentage, and the FWHM for each group are presented in Table S2, Supporting Information. In all Alg( x )‐CN x C 1 s spectrum samples COOH, CO, CO/CN, Csp 3 /CNH 2 , and C sp 2 groups were detected at 288.74, 287.57, 286.06, 285.05, and 284.37 eV, respectively (Figure 3a, Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Following the characterization, we performed high-resolution scans for C 1s, N 1s, and O 1s. The C 1s core-level deconvoluted spectra for the CN x sample showed the chemical groups COOH, C═O, CO/CN, Csp 3 /C─NH 2 , Csp 2 , and Fe 3 C, iron carbide (Figure 3a); [29] the gravity center, atomic percentage, and the FWHM for each group are presented in Table S2 3a, Table S2, Supporting Information). We compared the atomic percentage among samples using an absolute atomic percentage and normalizing all samples and spectrum.…”

Section: X-ray Photoelectron Spectroscopy Analysis Of Alg(x)-cn X Com...mentioning

confidence: 99%

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Highly Concentrated Nitrogen‐Doped Carbon Nanotubes in Alginate–Gelatin 3D Hydrogels Enable in Vitro Breast Cancer Spheroid Formation

Munguia-Lopez

Jiang

Ferlatte

et al. 2021

Advanced NanoBiomed Research

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Carbon nanotubes’ (CNTs) physicochemical and mechanical properties make them ideal reinforcement materials for hydrogels, but distributing CNTs homogeneously in hydrogels remains a challenge. Chemical modifications to CNTs are used to facilitate nanomaterial dispersion, thus improving hydrogels’ physicochemical properties. Among CNTs, nitrogen‐doped CNTs (CNx) possess both great dispersibility in solution and biocompatibility properties. By formulating a method to incorporate CNx within alginate (i.e., covalently grafting alginate to the CNx surface versus noncovalently adsorbing alginate to the CNx surface) creates extrudable materials with tunable physical, chemical, and thermal properties. Herein, three new composites of alginate‐CNx are created. The results indicate that all composites present different physicochemical and thermal properties, suggesting that alginate is reorganized according to their degree of oxidation. These composites show cytocompatibility with MDA‐MB‐231 and regulation over the size of spheroids formed within the matrix. CNx within the matrix negatively affects MCF‐7 cells viability, spheroid formation rate, and the quantity of spheroids developed during culture. These materials provide a useful 3D hydrogel that can be used to develop in vitro models to understand the role of microenvironmental factors such as stiffness or surface roughness on the development of spheroids and their subsequent phenotypic behavior.

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Topotactical Route to Multiwalled Cerium Oxide Nanotubes from MWCNTs

Pacheco‐Espinoza

Cuesta‐Balderas

Vázquez‐Lujano

et al. 2023

Part & Part Syst Charact

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biomedicine due to its ability to shift easily between Ce 4+ /Ce 3+ oxidation states, high oxygen storage capacity (OSC), increased oxygen ion conductivity, and excellent biocompatibility. [1,2] Over the years, extensive research efforts have been made to develop the controllable synthesis of CeO 2 nanomaterials with diverse structural morphologies owing to the importance of nano-size and geometrical effects. [3,4] Due to their inherent hollow structure, CeO 2 nanotubes possess a high surfaceto-volume ratio, which gives them active surface chemistry attributed to oxygen vacancies. Compared to 1D solid counterparts, CeO 2 nanotubes are more challenging to prepare since they demand a suitable strategy to develop the hollow structure. [5,6] Various soft-chemical methods have been investigated to prepare CeO 2 nanotubes. Methods include template-free and structural directingtemplate syntheses, the second being the most effective way to yield the hollow structure. Different growth mechanisms have been proposed by several research groups. Table S1 (Supporting Information) summarizes the synthesis methods, growth mechanisms, templates, and crystalline nature reported in the literature for CeO 2 nanotubes. Typical features of nanotubes include uniform wall thickness, diameters ranging from 10 to 500 nm, and lengths up to several micrometers. Often, nanotube walls are constituted by small crystallites with a random orientation. In some instances, however, crystalline regions show (111) preferred orientation, i.e., the stable CeO 2 (111) planes are preferentially exposed on nanotube-curved surfaces. The CeO 2 (111) is a Tasker type 2 surface, consisting of a repeating sequence of O-Ce-O trilayer units (3.1 Å in height) along [111] direction. [7,8] Atomistic simulations have demonstrated the structural stability of multiwalled CeO 2 nanotubes organized in a concentric circular configuration of OCeO units. [9] Moreover, simulations have indicated that the O vacancy cluster is more stable at the nanotube (111) outer surface than over a (111) flat surface. The presence of oxygen vacancies on the (111) surface is essential for enhancing the activity of CeO 2 . [10] However, continuous multiwalled arrangement along the tube axis to harness the benefits of a large curved CeO 2 ( 111) surface remains challenging. The MWCNTs as structural directing-template have been demonstrated to be effective in promoting uniform The development of new strategies for synthesizing 1D cerium oxide (CeO 2 ) hollow nanostructures has attracted much attention in recent years due to the importance of their superior properties and highly anisotropic geometry. This study reports an unpublished route of fabricating novel multiwalled CeO 2-δ nanotubes (CeO 2-δ NTs) in which the entire volume of functionalized multiwalled carbon nanotubes (f-MWCNTs) is converted into the CeO 2-δ pseudomorph through oxidation and dehydration topotactic reactions. The stable CeO 2-δ (111) planes are topotactically grown on the curved C (002) planes, preferentially expose...

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Oxygenated Surface of Carbon Nanotube Sponges: Electroactivity and Magnetic Studies

Cited by 13 publications

References 60 publications

Pyrrolic nitrogen-doped multiwall carbon nanotubes using ball-milled slag-SiC mixtures as a catalyst by aerosol assisted chemical vapor deposition

Pyrrolic nitrogen-doped multiwall carbon nanotubes using ball-milled slag-SiC mixtures as a catalyst by aerosol assisted chemical vapor deposition

Highly Concentrated Nitrogen‐Doped Carbon Nanotubes in Alginate–Gelatin 3D Hydrogels Enable in Vitro Breast Cancer Spheroid Formation

Topotactical Route to Multiwalled Cerium Oxide Nanotubes from MWCNTs

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