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EFFECT OF DIFFRENT SUBSTRATE TEMPERATURE ON GROWTH OF NANO CRYSTALLINE … grown at 550 °C substrate temperature, is evidenced . When the substrate temperature increased to 600 °C, the particle size decreased and a higher distribution of NCD could be observed (Figure 3, b). At 650°C, the grain size the particles became low and one can see a low density of NCD, which dispersed over the substrate surface (Figure 3,c). Thus, by increasing the temperature from 550°C to 650°C the crystal quality lowers. This indicates that nano crystalline diamond is suitably formed in a lower-temperature process. C. X-Ray Diffraction XRD analysis In XRD, the main peak is observed at 2θ=41.68°, 2 θ=41.81° and 2θ=41.67°, which indicates the diffraction of (101) d iamond for samples (a), (b) and (c), respectively. The results indicate a decrease in the quality of NCD by increasing the temperature up to 650°C and s uggested that the film has a strong (101) preferential texture. The full-width-half-maximum (B) of these peaks was used to calculate the grain size from the well-known Sherrer's formula [7]. Here K=0.9, λ=1.54A˚and θ is the Bragg angel. The grain size decreases from 43.1nm to the 35.9nm with the substrate temperature increasing. Similar results have been reported by Barbosa‘s group. They suggested that the increase in defect density is induced by temperature raising [11]. Next, the patterns show the peaks with 2θ=42.72° and 42.90° which indicate the diffraction of (102) diam ond structure. Figure 4 shows the XRD patterns for NCD grown on substrates at different temperatures. Figure 1. Generalized schematic HFCVD system (a) and the growth process in a diamond CVD reactor (b). 173
HASTI ATEFI, MAHMOOD GHORANNEVISS, ZAHRA KHALAJ, MIRCEA V. DIUDEA Figure 2. The gold layer thickness, on silicon substrates, equals 50nm. Fig. 3. SEM images of nanocrystalline diamond NCD grown at different substrate temperature (a): 550°C, (b):600°C, (c):650°C. 174
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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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YONG WANG, TAMARIA G. DEWDNEY, ZHIG
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ALEXANDRU LUPAN, CSONGOR MATYAS, AU
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EMILIA VANEA, SIMONA CAVALU, FLORIN
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ANDRA TĂMAŞ, MARTIN VINCZE The ma
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ANDRA TĂMAŞ, MARTIN VINCZE From t
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ANDRA TĂMAŞ, MARTIN VINCZE 2%B +
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ANDRA TĂMAŞ, MARTIN VINCZE increa
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EFFECT OF CATALYST LAYER THICKNESS
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SPECTRAL INVESTIGATIONS AND DFT STU
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TOPOLOGICAL SYMMETRY OF TWO FAMILIE
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TOPOLOGICAL SYMMETRY OF TWO FAMILIE
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NEW 1-AZABICYCLO[3.2.2]NONANE DERIV
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