Effects of pre-treatments and interlayers on the nucleation and growth of diamond coatings on titanium substrates

Fu, Yong Qing; Yan, Bibo; Loh, Nee Lam

doi:10.1016/s0257-8972(00)00701-5

Cited by 44 publications

(22 citation statements)

References 29 publications

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“…As for the different peak currents obtained on different BDD thin film electrodes at the same concentration of glucose, it may be due to different BDD thin film electrodes with different boron concentrations. The distribution of boron atoms in the diamond lattice is not homogeneous as the preferential incorporation occurs along the (111) planes [32]. Figure 8(a) shows that typical CV curves of the mixture of 0.5 mM AA, 0.5 mM UA and 4 mM glucose in 0.2 M sodium hydroxide.…”

Section: Electrochemical Detection Of Glucose In Basic Solutionsmentioning

confidence: 99%

Preparation of grain size controlled boron-doped diamond thin films and their applications in selective detection of glucose in basic solutions

et al. 2010

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Boron-doped diamond (BDD) thin films with different crystal grain sizes were prepared by controlling the reacting gas pressure using hot filament chemical vapor deposition (HFCVD). The morphologies and structures of the prepared diamond thin films were characterized by scanning electron microscopy (SEM) and Raman spectroscopy. The electrochemical responses of K 4 Fe(CN) 6 on different BDD electrodes were investigated. The results suggested that electron transfer was faster at the boron-doped nanocrystalline diamond (BDND) thin film electrodes in comparison with that at other BDD thin film electrodes. The prepared BDD thin film electrodes without any modification were used to directly detect glucose in the basic solution. The results showed that the as-prepared BDD thin film electrodes exhibited good selectivity for detecting glucose in the presence of ascorbic acid (AA) and uric acid (UA). The higher sensitivity was observed on the BDND thin film grown on the boron-doped microcrystalline diamond (BDMD) thin film surface, and the linear response range, sensitivity and the low detection limit were 0.25-10 mM, 189.1 A mmol 1 cm 2 and 25 M (S/N=3) for glucose in the presence of AA and UA, respectively. diamond thin films, electrochemical properties, selective, glucose, detection

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Section: Electrochemical Detection Of Glucose In Basic Solutionsmentioning

confidence: 99%

Preparation of grain size controlled boron-doped diamond thin films and their applications in selective detection of glucose in basic solutions

et al. 2010

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“…Figure 2 shows AFM images of the films according to Table 3. According to Fu et al [25], plasma-treated surface has some micro-level roughness caused by ion bombardment, which may improve the adhesion of the film to the substrate by an anchor effect between them. However, hydrogen pre-etching causes significant coarsening of Ti6Al4V microstructure and severe losses in mechanical properties, such as the impact strength [25,26].…”

Section: Resultsmentioning

confidence: 99%

“…According to Fu et al [25], plasma-treated surface has some micro-level roughness caused by ion bombardment, which may improve the adhesion of the film to the substrate by an anchor effect between them. However, hydrogen pre-etching causes significant coarsening of Ti6Al4V microstructure and severe losses in mechanical properties, such as the impact strength [25,26]. Figures 2(b) and (c) show the biggest holes at the surface and these holes may help to increase the film Even though all the surfaces are considerably smooth, th lues as a function of the co delaminate from the edges an tion coefficient according to th e authors could not verify any correlation between the average surface roughness and the concentration of nitrogen during the carbonitriding.…”

Section: Resultsmentioning

confidence: 99%

Adhesion Studies of Diamond-Like Carbon Films Deposited on Ti6Al4V Alloy after Carbonitriding

Lima-Oliveira¹,

Costa²,

Martins³

et al. 2012

OJMetal

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Diamond-like Carbon (DLC) coatings have attracted significant attention due to their low friction coefficient, high degree of hardness, chemical inertness, and high wear resistance as well as and their many possible uses in metallurgical, aeronautical, and biomedical applications. However, DLC has low adhesion strength to metallic substrates. Carbonitriding was performed before DLC deposition to improve this adherence. Different concentration of nitrogen in the gas mixture was used during the carbonitriding of Ti6Al4V alloy. DLC films were subsequently grown from methane using plasma enhanced chemical vapor deposition. The samples were characterized with Raman scattering spectroscopy, nanoindentation, and tribological tests. Films from 80.0% N 2 had the best friction coefficient (0.07) and a critical load of ~22 N. In the scratching test, these films had adhesive failure and they completely detached from the substrate only in the end of the tests. SEM images show carbonitring promoted a significant increase in the surface defects (homogeneously distributed) but without the presence of microcracks. EDX analysis indicated that nitrogen element was diffused throughout the thickness of the samples. Hydrogen and carbon atoms from carbonitriding formed a diffusion-barrier layer that can be used as the first step for DLC deposition. This carbonitriding can also provide a carbide layer, which serves as the precursor for the nucleation and growth of DLC films.

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“…27 The presence of a scattering peak at 1545 cm -1 is due to increasing graphite-like sp 2 bonded components at the grain boundaries in films, and the two scattering peaks at 1126 and 1440 cm -1 are attributed to NCD Raman peaks. 28 …”

Section: Fabrication Of Tyrosinase Modification Electrodesmentioning

confidence: 99%

A Tyrosinase Biosensor Based on ZnO Nanorod Clusters/ Nanocrystalline Diamond Electrodes for Biosensing of Phenolic Compounds

et al. 2009

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An amperometric biosensor was constructed by using ZnO nanorod clusters as platforms for immobilizing tyrosinase on the nanocrystalline diamond (NCD) electrodes. The results showed that ZnO nanorod clusters provided an advantageous microenvironment due to their favorable isoelectric point (IEP) for tyrosinase loading; immobilized tyrosinase generally retained its activity. The tyrosinase/ZnO/NCD electrode showed a linear response range of 1 -210 and sensitivity of 179.9 μA mmol -1 cm -2 for p-cresol. The corresponding values were 1 -190 and 90.2 for phenol, and 1 -250 and 121.3 for 4-chlorophenol. The low detection limits were estimated to be 0.2 μM for p-cresol, 0.5 μM for phenol, and 0.4 μM for 4-chlorophenol (S/N = 3). The prepared enzyme electrode could keep 85% of its original activity after intermittent use for 4 weeks when stored in a dry state at 277 K. Therefore, the ZnO nanorod cluster thin films have potential applications as platforms to immobilize other enzymes and bioactive molecules in biosensors.

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Effects of pre-treatments and interlayers on the nucleation and growth of diamond coatings on titanium substrates

Cited by 44 publications

References 29 publications

Preparation of grain size controlled boron-doped diamond thin films and their applications in selective detection of glucose in basic solutions

Preparation of grain size controlled boron-doped diamond thin films and their applications in selective detection of glucose in basic solutions

Adhesion Studies of Diamond-Like Carbon Films Deposited on Ti6Al4V Alloy after Carbonitriding

A Tyrosinase Biosensor Based on ZnO Nanorod Clusters/ Nanocrystalline Diamond Electrodes for Biosensing of Phenolic Compounds

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