Facile fabrication of carbon spheres/n-Si junction diodes based on sucrose

Nieves, Cesar A.; Meléndez, Anamaris; Pinto, Nicholas J.; Ramos, Idalia

doi:10.1007/s10854-016-5445-x

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…An aqueous solution of 8.22 g of sucrose dissolved in 30 mL of distilled water was heated at 200 o C in an air-tight autoclave for 4 h and then left to cool down to room temperature. This method has been reported in previous work by our group [9,24]. In summary, the hydrolysis of sucrose produces monosaccharides like glucose, and their subsequent dehydration leads to the formation of polymeric micelles with spherical shapes.…”

Section: Methodsmentioning

confidence: 72%

“…The inset in Figure 2(a) shows the EDX spectrum of the spheres where the reduction of residual O2 leads to a carbon composition of 99.5 at. % [24]. The spheres were hard, making it difficult to make a pressed pellet or a continuous film for electrical characterization as it would crack even with careful handling.…”

Section: Methodsmentioning

confidence: 99%

“…The details of the preparation of the CS/PEO composite were discussed in a previous publication [24]. Briefly, the CS and PEO were mixed in a 1:1 ratio and pressed using a Carver press at 15000 psi.…”

Section: B Cs/peomentioning

confidence: 99%

“…The carbon spheres are hard and difficult to process into stable films or pellets for practical applications. By forming composites with polyethylene oxide (PEO) we could use the spheres (CS/PEO) in the fabrication of diodes and subsequent half wave rectifier for low frequency signals [24]. In addition, we also analyzed the charge transport in these composites in the temperature range 300K > T > 80K [9].…”

Section: Introductionmentioning

confidence: 99%

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Temperature-dependent charge transport mechanisms in carbon sphere/polyaniline composite

et al. 2017

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Carbon spheres (CS) with diameters in the range 2 − 10µm were prepared via hydrolysis of a sucrose solution at 200 o C, and later annealed in N2 at 800 o C. The spheres were highly conducting but difficult to process into thin films or pressed pellets. In our previous work, composite samples of CS and the insulating polymer polyethylene oxide (PEO) were prepared and their charge transport was analyzed in the temperature range 80K < T < 300K. Here, we analyze charge transport in CS coated with a thin polyaniline (PANi) film doped with hydrochloric acid (HCl), in the same temperature range. The goal is to study charge transport in the CS using a conducting polymer (PANi) as a binder and compare with that occurring at CS/PEO. A conductivity maxima was observed in the CS/PEO composite but was absent in CS/PANi. Our data analysis shows that variable range hopping of electrons between polymeric chains in PANi-filled gaps between CS takes on a predominant part in transport through CS/PANi composites, whereas in CS/PEO composites, electrons travel through gaps between CS solely by means of direct tunneling. This difference in transport mechanisms results in different temperature dependences of the conductivity.PACS numbers:

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Section: Methodsmentioning

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: B Cs/peomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature-dependent charge transport mechanisms in carbon sphere/polyaniline composite

et al. 2017

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“…X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were further employed to reveal the structure of the CA@CdS-SV heterojunction. As shown in Figure g, the diffraction peaks at 24.8, 26.5, 28.2, 36.7, 43.7, 47.8, and 51.8° exactly belonged to the CdS crystal planes of (100), (002), (101), (102), (110), (103), and (112), respectively. , A broad diffraction peak of the CA appeared around 23.5°, implying the amorphous structure . The FTIR spectra of all samples are exhibited in Figure h.…”

Section: Resultsmentioning

confidence: 83%

Synergistic Effect of the Sulfur Vacancy and Schottky Heterojunction on Photocatalytic Uranium Immobilization: The Thermodynamics and Kinetics

Zhang

et al. 2022

Inorg. Chem.

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Not only a critical matter in the nuclear fuel cycle but uranium is also a global contaminant with both radioactive and chemical toxicity. Reducing soluble hexavalent uranium [U(VI)] to relatively nonimmigrated tetravalent uranium [U(IV)] by photocatalytic technologies is recognized as a highly promising strategy for avoiding environmental pollution and re-extracting uranium resources from nuclear wastewater. Herein, we have designed a heterojunction photocatalyst constructed from the carbon aerogels (CA) and the CdS nanoflowers with an S-vacancy (CA@CdS-SV). With the S-vacancy and heterojunction being synergized, the U(VI) removal rate exceeded 97% in 40 min without the addition of any sacrificial agents. As impacted by the synergistic effects of the S-vacancy and heterojunction, thermodynamics and kinetics revealed that photogenerated electrons were first captured via shallow traps generated by vacancies on CdS-SV and then transferred to the CA surfaces through the heterojunction to realize the spatial separation of carriers, thereby achieving a satisfactory performance. This work is considered to underpin the improvement of U(VI) immobilization by exploiting the synergistic effect of vacancy engineering and the Schottky heterojunction from the perspective of thermodynamics and kinetics.

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Design and fabrication of carbon spheres-supported cerium oxide heterostructured composites for enhanced photocatalytic activity

Chen

Wang

Pan

et al. 2022

Ceramics International

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Facile fabrication of carbon spheres/n-Si junction diodes based on sucrose

Cited by 6 publications

References 31 publications

Temperature-dependent charge transport mechanisms in carbon sphere/polyaniline composite

Temperature-dependent charge transport mechanisms in carbon sphere/polyaniline composite

Synergistic Effect of the Sulfur Vacancy and Schottky Heterojunction on Photocatalytic Uranium Immobilization: The Thermodynamics and Kinetics

Design and fabrication of carbon spheres-supported cerium oxide heterostructured composites for enhanced photocatalytic activity

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