Scholarlink

<p>Diamond nanoparticles modified with boron-containing carbon layers were synthesized for the first time via in-liquid microwave plasma chemical vapor deposition (IL-MPCVD). This synthesis strategy enables the formation of boron-modified diamond nanoparticles (NPs) under relatively mild plasma conditions specifically, at a low power of 440&#xa0;W and a high pressure of 60&#xa0;kPa directly within a carbon- and boron-containing liquid precursor. Monodisperse diamond particles with an average diameter of 500&#xa0;nm were used as the seed material. A MeOH/EtOH (9:1 v/v) mixture served as the carbon precursor, and boron oxide (B₂O₃) was introduced at a concentration of 10,000 ppm as the boron dopant source. Morphological analyses by SEM revealed that the particles retained their original size and shape after IL-MPCVD treatment, with only minor surface roughening observed indicative of nanocrystalline overgrowth. Raman spectroscopic characterization showed a downshift in the zone-centered phonon (ZCP) line from 1333&#xa0;cm⁻<sup>1</sup> to 1325&#xa0;cm⁻<sup>1</sup> and increased peak broadening, suggesting boron-related surface modification and structural disorder near the surface. Electrochemical measurements further confirmed the successful formation of boron-modified diamond surfaces. The boron-modified diamond electrode exhibited a wide potential window of 2.7&#xa0;V in 0.1 M H<sub>2</sub>SO<sub>4</sub> and a peak-to-peak separation (ΔEp) of 264 mV in 1 mM K<sub>3</sub>[Fe(CN)<sub>6</sub>]/K<sub>4</sub>[Fe(CN)<sub>6</sub>] + 1&#xa0;M KCl, which is comparable to those observed for BDD films fabricated using conventional gas-phase MPCVD techniques. These results collectively demonstrate that the IL-MPCVD technique is an efficient method for producing electrochemically active boron-modified diamond nanoparticles in a liquid environment, offering significant potential for applications in electrocatalysis and energy storage.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Boron-modified diamond nanoparticles prepared by in-liquid microwave plasma process

  • 期刊论文

  • 发表日期：

    2025年11月25日

查看全文
  • Yusuke Tominaga,
  • Kazuya Miyasaka,
  • Yuvaraj M. Hunge,
  • Takeshi Kondo,
  • Makoto Yuasa,
  • Hiroshi Uetsuka,
  • Chiaki Terashima

摘要

Diamond nanoparticles modified with boron-containing carbon layers were synthesized for the first time via in-liquid microwave plasma chemical vapor deposition (IL-MPCVD). This synthesis strategy enables the formation of boron-modified diamond nanoparticles (NPs) under relatively mild plasma conditions specifically, at a low power of 440 W and a high pressure of 60 kPa directly within a carbon- and boron-containing liquid precursor. Monodisperse diamond particles with an average diameter of 500 nm were used as the seed material. A MeOH/EtOH (9:1 v/v) mixture served as the carbon precursor, and boron oxide (B₂O₃) was introduced at a concentration of 10,000 ppm as the boron dopant source. Morphological analyses by SEM revealed that the particles retained their original size and shape after IL-MPCVD treatment, with only minor surface roughening observed indicative of nanocrystalline overgrowth. Raman spectroscopic characterization showed a downshift in the zone-centered phonon (ZCP) line from 1333 cm⁻1 to 1325 cm⁻1 and increased peak broadening, suggesting boron-related surface modification and structural disorder near the surface. Electrochemical measurements further confirmed the successful formation of boron-modified diamond surfaces. The boron-modified diamond electrode exhibited a wide potential window of 2.7 V in 0.1 M H2SO4 and a peak-to-peak separation (ΔEp) of 264 mV in 1 mM K3[Fe(CN)6]/K4[Fe(CN)6] + 1 M KCl, which is comparable to those observed for BDD films fabricated using conventional gas-phase MPCVD techniques. These results collectively demonstrate that the IL-MPCVD technique is an efficient method for producing electrochemically active boron-modified diamond nanoparticles in a liquid environment, offering significant potential for applications in electrocatalysis and energy storage.