Influence of modified carbon substrate on boron doped ultrananocrystalline diamond deposition

Author(s)

Oishi, Silvia Sizuka ^[1] ; Silva, Lilian Mieko ^[1] ; Botelho, Edson Cocchieri ^[2] ; Rezende, Mirabel Cerqueira ^[3] ; Alves Cairo, Carlos Alberto ^[4] ; Ferreira, Neidenei Gomes ^[1]

Affiliation

^[1] INPE, LAS, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Estadual Paulista UNESP, Dept Mat & Tecnol, Av Dr Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP - Brazil

^[3] Univ Fed Sao Paulo UNIFESP, Inst Ciencia & Tecnol, Rua Talim 330, BR-12231280 Sao Jose Dos Campos, SP - Brazil

^[4] DCTA, Div Mat, AMR, IAE, BR-12228904 Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: MATERIALS RESEARCH EXPRESS; v. 5, n. 2 FEB 2018.
• Web of Science Citations: 1

Abstract

Boron doped ultrananocrystalline diamond (B-UNCD) growth was studied on modified reticulated vitreous carbon (RVC) produced from poly(furfuryl alcohol) (PFA) resin with sodium hydroxide additions at two different heat treatment temperatures. The different amounts of NaOHin PFA (up to reaching pH values of around 3, 5, 7, and 9) aimed to neutralize the acid catalyst and to increase the PFA storage life. Besides, this procedure was responsible for increasing the oxygen content of RVC samples. Thus, the effect of carbon and oxygen coming from the substrates in addition to their different graphitization indexes on diamond morphology, grain size, preferential growth and boron doping level were investigated by FEG-SEM, x-ray diffraction and Raman spectroscopy. Therefore, B-UNCD films were successfully grown on RVC with pH values of 3, 5, 7, and 9 heat treated at 1000 and 1700 degrees C. Nonetheless, the higher oxygen amount during B-UNCD growth for samples with pH 7 and 9 heat treated at 1000 degrees C was responsible for the RVC surface etching and the decrease in the boron concentration of such samples. The cross section images showed that B-UNCD infiltrated at around 0.9 mm in depth of RVC samples while carbon nanowalls were observed mainly on RVC samples heat treated at 1000 degrees C for all pH range studied. (AU)

• FAPESP's process: 16/13393-9 - Semiconductor, polymeric, and carbonaceous composite electrodes ayming the synergy between water cleaning and energy storage processes
• Grantee: Neidenei Gomes Ferreira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/27164-6 - Production and characterization of reticulated vitreous carbon/nanodiamond/silver nanoparticles composites used for nitrate removal
• Grantee: Silvia Sizuka Oishi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral