Surface structure and electric properties of nitrogen incorporated NCD films

Sun, Qi; Wang, Jianhua; Wei, Jun; Liu, Fan

doi:10.1016/j.vacuum.2016.12.040

Cited by 11 publications

(6 citation statements)

References 32 publications

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“…With the N/C ratio of 0.4%, the sp 3 /sp 2 ratio of the film decreases to 5.5, indicating that the sp 2 fraction increases. Similar results were reported by Wang and co-workers [44]. The sp 2 structures are usually related to defects in the grain boundaries.…”

Section: Xps Analysissupporting

confidence: 90%

Effect of the N/C Ratios of Ammonia Added to Process Gas Mixtures on the Morphology and Structure of MPCVD Diamond Films

et al. 2018

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Abstract:In this study, N-doped diamond films were prepared through microwave plasma chemical vapor deposition with NH 3 /CH 4 /H 2 gas mixtures. The effects of the ammonia addition to the process gas mixture on the morphology and structure of diamond films were systematically investigated through characterization by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). This work focuses on the ammonia addition to the process gas mixtures in the narrow range of N/C ratios from 0.4% to 1.0%. The results reveal that different N/C ratios can affect the morphology, the preferred crystal orientation, and the sp 3 /sp 2 ratio in the films. When the N/C ratio of the process gas mixture ranges from 0.6% to 1.0%, the XRD and SEM results show that ammonia addition is beneficial for the growth of the (110) faceted grains. When the N/C ratio of the process gas mixture ranges from 0.8% to 1.0%, the XPS and Raman results indicate that the diamond films exhibit a considerable enhancement in the sp 3 fraction.

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Section: Xps Analysissupporting

confidence: 90%

Effect of the N/C Ratios of Ammonia Added to Process Gas Mixtures on the Morphology and Structure of MPCVD Diamond Films

et al. 2018

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“…It should be noted that the plasma polymerization of acetylene will not result in a very regular structure as described in [30] but rather in distributions of sp 2 and sp 3 bonds [31]. In the extreme case nano diamonds can be formed with plasma vapour deposition of CH 4 /H 2 /N 2 [32]. Assuming a maximum of 10% polymer content of modified silica of 30 nm diameter the thickness of the polymer layer may be around 0.5 nm.…”

mentioning

confidence: 99%

Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites

Rytöluoto

Anyszka

et al. 2019

Polymers

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Novel nanocomposites for dielectric applications-based polypropylene/poly(ethylene-co-octene) (PP/POE) blends filled with nano silica are developed in the framework of the European ‘GRIDABLE’ project. A tailor-made low-pressure-plasma reactor was applied in this study for an organic surface modification of silica. Acetylene gas was used as the monomer for plasma polymerization in order to deposit a hydrocarbon layer onto the silica surface. The aim of this modification is to increase the compatibility between silica and the PP/POE blends matrix in order to improve the dispersion of the filler in the polymer matrix and to suppress the space charge accumulation by altering the charge trapping properties of these silica/PP/POE blends composites. The conditions for the deposition of the acetylene plasma-polymer onto the silica surface were optimized by analyzing the modification in terms of weight loss by thermogravimetry (TGA). X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray fluorescence spectroscopy (EDX) measurements confirmed the presence of hydrocarbon compounds on the silica surface after plasma modification. The acetylene plasma modified silica with the highest deposition level was selected to be incorporated into the PP/POE blends matrix. X-ray diffraction (XRD) showed that there is no new crystal phase formation in the PP/POE blends nanocomposites after addition of the acetylene plasma modified silica. Differential scanning calorimetry results (DSC) show two melting peaks and two crystallization peaks of the PP/POE blends nanocomposites corresponding to the PP and POE domains. The improved dispersion of the silica after acetylene plasma modification in the PP/POE blends matrix was shown by means of SEM–EDX mapping. Thermally stimulated depolarization current (TSDC) measurements confirm that addition of the acetylene plasma modified silica affects the charge trapping density and decreases the amount of injected charges into PP/POE blends nanocomposites. This work shows that acetylene plasma modification of the silica surface is a promising route to tune charge trapping properties of PP/POE blend-based nanocomposites.

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“…NH3 is preferred over N2 because of weaker N-H bond as compared to stronger NN bond of N2 under HFCVD reactor [10]. The reported N/C ratio in the feedstock is varied from as small as 0.1 to greater than 150 % for the growth of N doped diamonds [10][11][12][13][14][15][16][17][18][19][20][21]. The presence of N in feedstock significantly affect the growth mechanism, morphology, growth rate, grain size, chemical bonding at grain and GBs.…”

Section: Introductionmentioning

confidence: 99%

“…Further, the morphology and growth habit change due to the orientation dependent growth rate which results in texturing of diamond films [11,12,13,14,15,16]. Also, the presence of N in the feedstock increases the amount of H impurity incorporation in diamond during growth [17].…”

Section: Introductionmentioning

confidence: 99%

“…Further, N incorporation in feedstock is found to either improve or deteriorate the structural quality of diamond upon N/C ratio and other feedstock composition [10,18]. Moreover, diamond films are also grown under N rich environments (N/C ratio > 100 % in feedstock) which results in nanocrystalline structure with high conductivity [16,19]. Furthermore, the grain size is noticed to decrease significantly with a small amount of N/C ratio in the feedstock [17].…”

Section: Introductionmentioning

confidence: 99%

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Structural, Raman and photoluminescence studies on nanocrystalline diamond films: Effects of ammonia in feedstock

Ganesan¹,

Ajikumar²,

Srivastava³

et al. 2020

Diamond and Related Materials

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Herein, we report on the improvement of structural quality and enhancement of photoluminescence (PL) emission for an optimally N doped nanocrystalline diamond (NCD) film.Pure and N doped nanocrystalline diamond films are synthesized on Si by hot filament chemical vapour deposition using NH3:CH4:H2 at different nominal N/C ratios viz. 0, 0.13, 0.35, 0.50 and 0.75 in feedstock. X-ray diffraction analysis reveal a systematic initial increase and then a decrease in crystallite size with N/C ratio in feedstock. Further, a monotonic increase in Raman line width and peak position of diamond band indicates that the compressive strain in diamond lattice increases as a function of N/C ratio upto 0.50. However, at higher N/C ratio of 0.75, the compressive strain gets relaxed a little and produces a lower strain. Furthermore, a unique Raman mode at 1195 cm -1 is observed corresponding to the C=N-H vibrations indicating a significant N concentration in the NCD films. In addition, visible and UV PL studies reveal the presence of several N-related colour centres with multiple emission lines in the range of 380 -700 nm. An optimally N doped diamond film grown at N/C ratio of 0.35 in feedstock shows a significant enhancement in room temperature PL emission at ~ 505 and 700 nm. This PL enhancement is attributed to H3 and other aggregates of N related defect centres, under 355 and 532 nm laser excitations respectively.

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Surface structure and electric properties of nitrogen incorporated NCD films

Cited by 11 publications

References 32 publications

Effect of the N/C Ratios of Ammonia Added to Process Gas Mixtures on the Morphology and Structure of MPCVD Diamond Films

Effect of the N/C Ratios of Ammonia Added to Process Gas Mixtures on the Morphology and Structure of MPCVD Diamond Films

Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites

Structural, Raman and photoluminescence studies on nanocrystalline diamond films: Effects of ammonia in feedstock

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