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EFFECT OF CATALYST LAYER THICKNESS ON GROWTH OF CVD DIAMOND grain size of samples B and C was shown in the inset of Fig. 2. The smallest grain size with around a couple of tens nanometers corresponded to sample B. The second nucleation made bigger particles in sample C. Fig. 1. DEKTAK profilometer results show: a) sample A with 21.6nm, b) Sample B with 49nm, and c) sample C with 62.4 nm, for thickness layer. 259
FATEMEH SHAHSAVARI, MAHMOOD GHORANNEVISS, ZAHRA KHALAJ, MIRCEA V. DIUDEA 3. X-ray diffraction XRD patterns of the diamond films deposited for different catalyst layer thicknesses were shown in Fig. 3. For diamond films in sample A, XRD patterns exhibit four peaks from (1 1 1), (104), (110), and (311) crystal planes of diamond. By increasing the layer thickness in sample B, five different crystalline structure of(101), (1 0 2), (104), (108) and (311) was observed, in which the best quality of the diamond peaks refer to the structure with (101) crystallinity. For sample C, the diamond peaks with (111) and (106) crystal planes were only observed. To investigate more, the XRD results were summarized in Table 1. Crystalline structures of (104) and (311) existed in both sample A and B, which they had a higher relative intensity and FWHM in sample B. Regarding to Sherrer's formula, sample B had a better quality and smaller grain size. There was the same crystalline structure of (111) for sample A and C which had the same amount of FWHM and different relative intensities. In XRD spectra of sample C, a sharper peak at 16.3˚ and 33.13˚ corresponded to non-diamond structures. The results show that, by increasing the thickness of the catalyst layer, from 49nm to 62nm, we can see some extra structures. It can be concluded that catalyst thickness layer directly changed the quality, grain size and even crystalline structure of deposited diamond films. XRD studies confirmed previous observation in SEM images that the smallest grain size was corresponding to sample B, which has also the best quality of diamond films. In all samples, the peak at 2theta≈69.2˚ corresponded to Si, the substrate. Fig, 2. SEM morphologies of the nanocrystalline diamond deposited in various thicknesses of catalyst layers: (a) sample A, (b) sample B, and (c) sample C. The inset shows the Increasing of the grain size in 200nm scale by increasing the thickness of the nano catalyst layer from sample B to C. 260
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CHEMIA 3/2011
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CORINA COSTESCU, LAURA CORPAŞ, NIC
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Studia Universitatis Babes-Bolyai C
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MONICA BAIA, MONICA SCARISOREANU, I
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STUDIA UBB CHEMIA, LVI, 3, 2011 (p.
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PREPARATION, CHARACTERIZATION AND S
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SPECTROSCOPIC EVIDENCE OF COLLAGEN
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CORNEL-VIOREL POP, TRAIAN ŞTEFAN,
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VITALY ERUKHIMOVITCH, IGOR MUKMANOV
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DUMITRU GEORGESCU, ZSOLT PAP, MONIC
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MAHDIEH AZARI, ALI IRANMANESH DEFIN
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MAHDIEH AZARI, ALI IRANMANESH V ( G
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MAHDIEH AZARI, ALI IRANMANESH Now,
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MAHDIEH AZARI, ALI IRANMANESH Let T
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MAHDIEH AZARI, ALI IRANMANESH Let G
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MAHDIEH AZARI, ALI IRANMANESH ACKNO
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CRISTINA GRUIAN, HEINZ-JÜRGEN STEI
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CYCLODEXTRINS AND SMALL UNILAMELLAR
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CYCLODEXTRINS AND SMALL UNILAMELLAR
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PROTEIN ADHESION TO BIOACTIVE MICRO
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LC/MS ANALYSIS OF STEROLIC COMPOUND
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LC/MS ANALYSIS OF STEROLIC COMPOUND
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INVESTIGATION OF THE EFFECTS OF DEG
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PM3 CONFORMATIONAL ANALYSIS OF THE
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EDINA DORDAI, DANA ALINA MĂGDAŞ,
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UV ABSORPTION PROPERTIES OF DOPED P
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UV ABSORPTION PROPERTIES OF DOPED P
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HASTI ATEFI, MAHMOOD GHORANNEVISS,
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LUCIANA UDRESCU, BOGDAN MARTA, MIHA
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ALI MADANSHEKAF, MARJAN MORADI wher
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ALI MADANSHEKAF, MARJAN MORADI Agai
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ROZALIA VERES, CONSTANTIN CIUCE, VI
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EVALUATION OF FREE RADICAL CONCENTR
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