A one-pot hydrothermal synthesis of tunable dual heteroatom-doped carbon microspheres

Wohlgemuth, Stephanie-Angelika; Vilela, Filipe; Titirici, Maria‐Magdalena; Antonietti, Markus

doi:10.1039/c2gc16415a

Cited by 172 publications

(121 citation statements)

References 51 publications

Supporting

Mentioning

115

Contrasting

Order By: Relevance

“…The intensity of peaks depend on the tautomeric conformation adopted by the molecule. Peak at 287.6 eV is assigned to electron deficient carbon connected to the electronegative nitrogen atom (C=N) whereas, 286.2 eV peak shows two components C-N/C-S (Wohlgemuth, White, Willinger, Titirici, & Antonietti, 2012). The area under C-N/C-S peak is thrice of C=N peak, which is in agreement to the proposed molecular structure.…”

Section: /2 Xy(isupporting

confidence: 71%

“…The area under C-N/C-S peak is thrice of C=N peak, which is in agreement to the proposed molecular structure. The main carbon peak at 284.6 eV is assigned to benzene like carbon atoms (sp 2 C-C or C-H) (Wohlgemuth et al, 2012). XPS spectrum of N 1s ( Co-S-R Bridge S Oxidised S Co-O-H Due to oxidised S 2c) shows two peaks at 400.1 and 398.7 eV corresponding to the pyrrolic nitrogen and pyridinic nitrogen (Wohlgemuth et al, 2012) with an area ratio 1:1.…”

Section: /2 Xy(imentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Ujjain¹,

Ahuja²,

Sharma³

et al. 2015

IJC

View full text Add to dashboard Cite

Schiff base containing symmetric bis-dithiocarbamate ligand Na 2 [dtc-SB-dtc] (SB = Bi-Schiff base Phenylene diamine) is synthesized and metallated with Co(II)Cl 2 .6H 2 O to form [Co(dtc-SB-dtc).2H 2 O] n Co(dtc-SB) infinite coordination polymer (ICP) nanowires [Co(dtc-SB) NWs]. Pair of Satellites in X-ray photoelectron spectroscopy (XPS) spectrum of Co 2p confirm the formation of hexa-coordinated Co(II). Presence of hyperfine pattern in low temperature EPR spectrum is due to the splitting of octahedral ground state 4 T 1 for Co(II). Introduction of a rigid, non-planar, four membered dtc Cobalt chelating ring in coordination polymer assisted in reduction of photoinduced electron transfer (PET) process to yield high fluorescence. Prepared Co(dtc-SB) NWs are highly resistive however after suitable doping, exhibit p and n type conductivity. Temperature dependent conductivity results of different doping concentrations in NWs reflect activated type conduction with two different activation energies. UV-Visible absorption spectra show decrement in optical gap whereas emission spectra demonstrate quenching after p and n doping. Efficient quenching of emission indicates energy transfer between dopant ions and NWs.

show abstract

Section: /2 Xy(isupporting

confidence: 71%

Section: /2 Xy(imentioning

confidence: 99%

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Ujjain¹,

Ahuja²,

Sharma³

et al. 2015

IJC

View full text Add to dashboard Cite

show abstract

“…These carbon spheres can be further pyrolysed to increase the aromatisation and condensation of the carbon backbone, yielding a more graphitised S-and N-doped carbon with sulphur contents of up to $7 wt% and nitrogen contents of up to $4.5 wt%. 138 In a subsequent study the authors modied their hydrothermal approach by adding albumin to the precursor mixture; the morphology of the S-N-codoped carbons could be drastically altered and aerogel-like monolithic structures with surface areas of up to 321 m 2 g À1 (aer additional pyrolysis at 900 C under nitrogen) were achieved. The S/N-doped aerogels were tested for their ORR activity, giving good results under alkaline conditions and reasonable activity under acidic conditions, while in the latter case at least showing a better stability than platinum based conventional catalysts.…”

Section: Carbon Materials Dually Doped With Sulphur and Nitrogenmentioning

confidence: 99%

Doping carbons beyond nitrogen: an overview of advanced heteroatom doped carbons with boron, sulphur and phosphorus for energy applications

Paraknowitsch

Thomas

2013

Energy Environ. Sci.

1,673

999

View full text Add to dashboard Cite

Heteroatom doped carbon materials represent one of the most prominent families of materials that are used in energy related applications, such as fuel cells, batteries, hydrogen storage or supercapacitors. While doping carbons with nitrogen atoms has experienced great progress throughout the past decades and yielded promising material concepts, also other doping candidates have gained the researchers' interest in the last few years. Boron is already relatively widely studied, and as its electronic situation is contrary to the one of nitrogen, codoping carbons with both heteroatoms can probably create synergistic effects. Sulphur and phosphorus have just recently entered the world of carbon synthesis, but already the first studies published prove their potential, especially as electrocatalysts in the cathodic compartment of fuel cells. Due to their size and their electronegativity being lower than those of carbon, structural distortions and changes of the charge densities are induced in the carbon materials. This article is to give a state of the art update on the most recent developments concerning the advanced heteroatom doping of carbon that goes beyond nitrogen. Doped carbon materials and their applications in energy devices are discussed with respect to their boron-, sulphur-and phosphorus-doping. Broader contextThe research and design of novel materials that are applicable in various energy devices represent one of the central and most thriving subjects within today's scientic work. The challenges do not only rely on the tremendous need to overcome traditional fossil fuel based energy recovery. While a lot of sustainable concepts already exist, these require the development of high performance materials that are able to cope with certain challenges, e.g. the dependence on highly expensive and rather not abundantly available noble metals, and also a lack of long term stability of those. Researchers have been carrying out numerous studies concentrating on nding alternative materials that can be applied in novel energy devices. Those alternative materials should most preferably be free of noble metals, avoid expensive precursor systems, be sustainable and not rely on the fossil energy sources that are to be replaced, and of course exhibit high activity in the devices they are designed for. One class of materials in whose development and understanding researchers have put strong effort is heteroatom-doped carbon materials. By heteroatom doping the properties are altered compared to crude carbon materials. The by far most intensely studied doping candidate is nitrogen, capable of not only increasing electric conductivity, but also the catalytic activity of carbons. Such N-doped carbons have advanced tremendously in the past few years, especially by proving their usefulness as electrocatalysts for the reduction of oxygen in fuel cell cathodes, or as electrode materials in supercapacitors. Meanwhile the spectrum of doping has been widened, and novel doped carbons have been reported, indicating the promising pote...

show abstract

“…Carbon nanofoams usually consist of agglomerations of porous nano-or micron-sized spheres. Such so-called nanoor micro-pearls have been produced by various methods such as laser ablation [48][49][50], chemical vapor deposition (CVD) [39,[51][52][53][54][55][56][57][58][59][60] or hydrothermal carbonization (HTC) [30][31][32][33]46,[61][62][63][64][65][66][67]. In this paper, we show that morphologies other than micropearls can be synthesized just by changing the process parameters.…”

Section: Discussionmentioning

confidence: 99%

“…Hydrothermal carbonization is a thermochemical process where hydrocarbon precursors are transformed into all-carbon materials [2,9,61]. Variables such as precursor composition, as well as autoclave temperature, pressure, and process time, critically determine the synthesized carbon morphologies and their functionalities [104].…”

Section: Hydrothermal Synthesismentioning

confidence: 99%

Diamond-Like Carbon Nanofoam from Low-Temperature Hydrothermal Carbonization of a Sucrose/Naphthalene Precursor Solution

Frese

Mitchell

Bowers

et al. 2017

View full text Add to dashboard Cite

Unusual structure of low-density carbon nanofoam, different from the commonly observed micropearl morphology, was obtained by hydrothermal carbonization (HTC) of a sucrose solution where a specific small amount of naphthalene had been added. Helium-ion microscopy (HIM) was used to obtain images of the foam yielding micron-sized, but non-spherical particles as structural units with a smooth foam surface. Raman spectroscopy shows a predominant sp 2 peak, which results from the graphitic internal structure. A strong sp 3 peak is seen in X-ray photoelectron spectroscopy (XPS). Electrons in XPS are emitted from the near surface region which implies that the graphitic microparticles have a diamond-like foam surface layer. The occurrence of separated sp 2 and sp 3 regions is uncommon for carbon nanofoams and reveals an interesting bulk-surface structure of the compositional units.

show abstract

A one-pot hydrothermal synthesis of tunable dual heteroatom-doped carbon microspheres

Cited by 172 publications

References 51 publications

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Synthesis, Electronic and Optical Properties of Cobalt(II) Dithiocarbamate Fluorescent Nanowires for Optoelectronic Devices

Doping carbons beyond nitrogen: an overview of advanced heteroatom doped carbons with boron, sulphur and phosphorus for energy applications

Diamond-Like Carbon Nanofoam from Low-Temperature Hydrothermal Carbonization of a Sucrose/Naphthalene Precursor Solution

Contact Info

Product

Resources

About