Preparation of Aniline-Based Nitrogen-Containing Diamond-Like Carbon Films with Low Electrical Resistivity

Hatada, Ruriko; Flege, Stefan; Ensinger, Wolfgang; Hesse, Sabine; Tanabe, Shuji; Nishimura, Yasuhisa; Baba, Koumei

doi:10.3390/coatings10010054

Cited by 10 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…C‐C(H) and C‐Br lie at 284.3 eV and 284.8 eV, respectively, very close to values obtained for the undoped molecule adsorbed on Au(111), [ 36 ] and the value of 285.4 eV obtained for C‐NH is characteristic of pyridine groups. [ 39,40 ] The Br 3d doublet appears at 70.7/69.7 eV, energies corresponding to C‐bonded Br [ 36,41 ] For N, we find a single 1s component at 398.8 eV, energy expected for pyridinic N, [ 17 ] with relative area close to the stoichiometric relation. Altogether they represent signatures of the pristine molecule.…”

Section: Resultsmentioning

confidence: 84%

Introducing Design Strategies to Preserve N‐Heterocycles Throughout the On‐Surface Synthesis of Graphene Nanostructures

Tenorio,

Moreno,

Vilas‐Varela

et al. 2023

Small Methods

View full text Add to dashboard Cite

Despite the impressive advances in the synthesis of atomically precise graphene nanostructures witnessed during the last decade, advancing in compositional complexity faces major challenges. The concept of introducing the desired functional groups or dopants in the molecular precursor often fails due to their lack of stability during the reaction path. Here, a study on the stability of different pyridine and pyrimidine moieties during the on‐surface synthesis of graphene nanoribbons on Au(111) is presented. Combining bond‐resolved scanning tunneling microscopy with X‐ray photoelectron spectroscopy, the thermal evolution of the nitrogen dopants throughout the whole reaction sequence is tracked. A comparative experimental and ab initio electronic characterization confirms the presence of dopants in the final structures, revealing also that the pyridinic nitrogen leads to a significant band downshift. The results demonstrate that, by using synthetic strategies to lower the reaction temperatures, one can preserve specific N‐heterocycles throughout all the reaction steps of the synthesis of graphene nanoribbons and beyond the interibbon coupling reaction that leads to nanoporous graphene.

show abstract

Section: Resultsmentioning

confidence: 84%

Introducing Design Strategies to Preserve N‐Heterocycles Throughout the On‐Surface Synthesis of Graphene Nanostructures

Tenorio,

Moreno,

Vilas‐Varela

et al. 2023

Small Methods

View full text Add to dashboard Cite

show abstract

“…Figure a–d highlights the C 1s peaks of XPS spectra of the DLC film and Q-carbon filament, cluster, and microdot-like structures with C–O, C–C (sp 3 ), and C–C (sp 2 ) bonds, respectively. The C 1s core-level spectra of DLC film in Figure a show C–C (sp 2 ), C–C (sp 3 ), and C–O bonds at 284.1, 284.9, and 287.8 eV, respectively, and the sp 2 and sp 3 percentages were evaluated from the peak areas and the intensity value. − The peak shift was observed in Q-carbon structures in Figure b–d toward a higher binding energy region due to the charging effect. Charging is induced by electrons leaving the Q-carbon surface without being replaced, and the surface becomes increasingly positive due to the lack of electron replenishment, which causes a voltage bias to build up and shift the spectrum solely to higher binding energies .…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Electrochemical Supercapacitor Performance of Self-Assembled Ferromagnetic Q-Carbon

Karmakar

Taqy

Droopad

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Novel phase Q-carbon thin films exhibit some intriguing features and have been explored for various potential applications. Herein, we report the growth of different Q-carbon structures (i.e., filaments, clusters, and microdots) by varying the laser energy density from 0.5 to 1.0 J/cm 2 during pulsed laser annealing of amorphous diamond-like carbon films with different sp 3 −sp 2 carbon compositions. These unique nano-and microstructures of Q-carbon demonstrate exceptionally stable electrochemical performance by cyclic voltammetry, galvanostatic charging−discharging, and electrochemical impedance spectroscopy for energy applications. The temperature-dependent magnetic studies (magnetization vs magnetic field and temperature) reveal the ferromagnetic nature of the Qcarbon microdots. The saturation magnetization and coercive field values decrease from 132 to 14 emu/cc and 155 to 92 Oe by increasing the temperature from 2 to 300 K, respectively. The electrochemical performances of Q-carbon filament, cluster, and microdot thin-film supercapacitors were investigated by twoelectrode configurations, and the highest areal specific capacitance of ∼156 mF/cm 2 was observed at a current density of 0.15 mA/ cm 2 in the Q-carbon microdot thin film. The Q-carbon microdot electrodes demonstrate an exceptional capacitance retention performance of ∼97.2% and Coulombic efficiency of ∼96.5% after 3000 cycles due to their expectational reversibility in the charging−discharging process. The kinetic feature of the ion diffusion associated with the charge storage property is also investigated, and small changes in equivalent series resistance of ∼9.5% and contact resistance of ∼9.1% confirm outstanding stability with active charge kinetics during the stability test. A high areal power density of ∼5.84 W/cm 2 was obtained at an areal energy density of ∼0.058 W h/cm 2 for the Q-carbon microdot structure. The theoretical quantum capacitance was obtained at ∼400 mF/ cm 2 by density functional theory calculation, which gives an idea about the overall capacitance value. The obtained areal specific capacitance, power density, and impressive long-term cyclic stability of Q-carbon thin-film microdot electrodes endorse substantial promise in high-performance supercapacitor applications.

show abstract

“…Samples were prepared in a homemade PSII setup, using a high voltage applied to the sample holder to ignite the plasma; i.e., no additional plasma source was employed (a schematic of a comparable setup can be found in [31]). The voltage was either a DC voltage (−1.5, −2 or −2.5 kV; HCP 5000-3500, FuG Elektronik, Schechen, Germany) or a pulsed voltage (−10, −15 or −18 kV; RUP 6-25, GBS Elektronik GmbH, Radeberg, Germany) with 40 µs pulse length and 250 Hz repetition rate.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Preparation Conditions on the Structural Properties and Hardness of Diamond-Like Carbon Films, Prepared by Plasma Source Ion Implantation

et al. 2020

Self Cite

View full text Add to dashboard Cite

Diamond-like carbon (DLC) films were prepared from a hydrocarbon precursor gas by plasma source ion implantation (PSII), in which the plasma generation and the film deposition were coupled; i.e., the plasma was generated by the applied voltage and no additional plasma source was used. Several experimental parameters of the PSII process were varied, including the sample bias (high voltage, DC or pulsed), gas pressure, sample holder type and addition of argon in the plasma gas. The influence of the deposition conditions on the carbon bonding and the hydrogen content of the films was then determined using Raman spectroscopy. Nanoindentation was used to determine the hardness of the samples, and a ball-on-disk test to investigate the friction coefficient. Results suggest that films with a lower sp2 content have both a higher hydrogen content and a higher hardness. This counterintuitive finding demonstrated that the carbon bonding is more important to hardness than the reported hydrogen concentration. The highest hardness obtained was 22.4 GPa. With the exception of a few films prepared using a pulsed voltage, all conditions gave DLC films having similarly low friction coefficients, down to 0.049.

show abstract

Preparation of Aniline-Based Nitrogen-Containing Diamond-Like Carbon Films with Low Electrical Resistivity

Cited by 10 publications

References 35 publications

Introducing Design Strategies to Preserve N‐Heterocycles Throughout the On‐Surface Synthesis of Graphene Nanostructures

Introducing Design Strategies to Preserve N‐Heterocycles Throughout the On‐Surface Synthesis of Graphene Nanostructures

Highly Stable Electrochemical Supercapacitor Performance of Self-Assembled Ferromagnetic Q-Carbon

The Influence of Preparation Conditions on the Structural Properties and Hardness of Diamond-Like Carbon Films, Prepared by Plasma Source Ion Implantation

Contact Info

Product

Resources

About