Shape-controlled synthesis of diamond crystal by epitaxial growth under high pressure and high temperature conditions

刘晓兵,; 贾晓鹏,; 张壮飞,; 黄海亮,; 周振祥,; 马红安,

doi:10.1088/1674-1056/20/12/128102

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…During the growth of diamond films by a chemical vapor deposition (CVD) method, the diamond surface is continuously surrounded by abundant energetic hydrocarbon (CH x ) species and atomic hydrogen (H). [1][2][3][4][5] The atomic H tends to passivate the growing surface of the diamond film by forming C-H bonds. The succeeding diamond growth relies on the continuous exchange of the terminating H with the CH x species.…”

Section: Introductionmentioning

confidence: 99%

Fluctuations of electrical and mechanical properties of diamond induced by interstitial hydrogen

Liu¹

2015

Chinese Phys. B

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While experimental evidence demonstrates that the presence of hydrogen (H) impurities in diamond films plays a significant role in determining their physical properties, the small radius of the H atom makes detecting such impurities quite a challenging task. In the present work, first-principles calculations were employed to provide an insight into the effects of the interstitial hydrogen on the electrical and mechanical properties of diamond crystals at the atomic level. The migrated pathways of the interstitial hydrogen are dictated by energetic considerations. Some new electronic states are formed near the Fermi level. The interstitial hydrogen markedly narrows the bandgap of the diamond and weakens the diamond crystal. The obvious decrement of the critical strain clearly implies the presence of an H-induced embrittlement effect.

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Section: Introductionmentioning

confidence: 99%

Fluctuations of electrical and mechanical properties of diamond induced by interstitial hydrogen

Liu¹

2015

Chinese Phys. B

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“…Atualmente duas técnicas de sintetização de diamante são amplamente utilizadas no desenvolvimento de tecnologias: são elas a HPHT e a CVD [53][54][55][56]. As siglas são derivadas do inglês, significando respectivamente: Alta Pressão e Alta Temperatura (High Pressure and High Temperature) e Deposição Química a partir da Fase de Vapor (Chemical Vapor Deposition).…”

Section: Técnicas De Sintetização De Diamanteunclassified

“…Na técnica HPHT, a grafite é comprimida e aquecida em uma prensa hidráulica na presença de um catalisador metálico. A temperatura e pressão necessárias para o sucesso do método são respectivamente superiores a 2.000 o C e 10.000 atm [53][54][55][56][57]. Apesar de o diamante e a grafite serem alótropos e as entalpias de formação destes materiais diferirem apenas por 2,9 kJ mol -1 , há uma enorme barreira de ativação separando essas duas fases do carbono, fato que justifica a elevada pressão e temperatura para formar o diamante [61].…”

Section: Técnicas De Sintetização De Diamanteunclassified

Desenvolvimento de eletrodos cilíndricos de diamante para tratamento de águas

Giovani Zanin

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Eletrodos cilíndricos de diamante foram desenvolvidos com até 75 cm 2 de área e aplicados em degradações eletroquímicas de poluentes recalcitrantes em águas. Estudo sistemático foi realizado para a deposição de filmes de diamantes condutores e bem aderentes à superfície de diversos materiais. Estes eletrodos foram caracterizados em termos de suas propriedades físicas e eletroquímicas por microscopia eletrônica de varredura, espectroscopia Raman e de energia dispersiva de Raio-X, voltametria, nanoindentação, quatro pontas de prova e ensaios de aderência. As oxidações de diversos micro-poluentes emergentes em água foram estudadas e monitoradas por absorbância na região do UV/Vis, demanda química de oxigênio (COD) e carbono orgânico total (TOC). Os resultados obtidos nas eletrodegradações, empregando os eletrodos cilíndricos de diamante desenvolvidos, foram plenamente satisfatórios quando comparado com os melhores resultados já apresentados na literatura, utilizando placas de diamante convencionais.

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The microstructural and electrochemical properties of oxygen ion implanted nanocrystalline diamond films

Wang¹,

Hu²

2014

Acta Phys. Sin.

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The nanocrystalline diamond (NCD) films are implanted by oxygen ions with a dose of 1×1012 cm-2 and subsequently annealed at 700, 800, 900 and 1000 ℃, respectively. The microstructure and electrochemical properties of these NCD films are investigated systematically and the results show that the potential windows of the unannealed sample (O120) and 1000 ℃ annealed sample (O121000) increase up to 4.6 V and 3.61 V, respectively. The mass transfer efficiencies of the two samples are also better, indicating that the oxygen ion implantation and 1000 ℃ annealing can improve the mass transfer efficiency of NCD film. The results of infrared spectrum measurements show that there are no hydrogen atoms that are terminated to the surfaces of samples O120 and O121000, while hydrogen atoms terminate to the surfaces of the other samples. It is indicated that oxygen ion implantation and 1000 ℃ annealing can damage hydrogen terminations in the surface, which improves the electrochemical performances of NCD films. Raman spectrum measurements suggest that high content of diamond phase, small internal stress and more disordered amorphous carbon can improve the electrochemical properties of NCD films. When the number or size of sp2 carbon clusters in amorphous carbon grain boundaries decreases, the electrochemical properties of NCD films become better.

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Shape-controlled synthesis of diamond crystal by epitaxial growth under high pressure and high temperature conditions

Abstract: Shape-controlled synthesis of diamond crystal by epitaxial growth under high pressure and high temperature conditions * Liu Xiao-Bing( ) a) , Jia Xiao-Peng( ) a) , Zhang Zhuang-Fei( ) a) , Huang Hai-Liang( ) b) , Zhou Zhen-Xiang( ) a) , and Ma Hong-An( ) a) †

Cited by 3 publications

References 32 publications

Fluctuations of electrical and mechanical properties of diamond induced by interstitial hydrogen

Fluctuations of electrical and mechanical properties of diamond induced by interstitial hydrogen

Desenvolvimento de eletrodos cilíndricos de diamante para tratamento de águas

The microstructural and electrochemical properties of oxygen ion implanted nanocrystalline diamond films

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