Boron-doped nanocrystalline

Gajewski W, Achatz P, Williams OA, Haenen K, Bustarret E, Stutzmann M, Garrido JA (2009) Electronic and Optical Properties of Boron-Doped Nanocrystalline Diamond Films. J. phys. rev. B 79 045206. 

Fig. 5 SEM images of (a) a boron-doped microcrystalline and (b) a boron-doped nanocrystalline diamond thin film grown on Si.

Figure 6 shows Hall measurement data for a series of boron-doped nanocrystalline diamond films deposited with different levels of B2H6 added to the source gas mixture. Measurements of the carrier concentration and mobility were made at different temperatures up to about 500°C. At room temperature, the carrier concentration increases and the hole mobility decreases as B2H6 added to the source gas mixture with values in the range of 10 -10 cm and 10-100 cm /V-s, respectively. The carrier concentration and the doping level increase proportionally with B2H6 added. 

FIG. 6. Carrier concentrations and mobilities (holes) in boron-doped nanocrystalline diamond thin-film electrodes as a function of the B2H6 concentration added to the source gas mixture. The measurements were made in a van der Pauw geometry with Ti contacts by Dr. Toshihiro Ando at NIMS. The limit of the temperature measurements was approximately 500 K. 

Boron-doped nanocrystalline diamond films have recently been produced and evaluated as electrodes [115]. The films consist of clusters of diamond grains, 100 nm in diameter, and possess an rms surface roughness of 34 nm over a 5 x 5 pm area. The individual diamond grains are approximately 10 15 nm in diameter, as determined by TEM. Films with a thickness ranging from 0.5 to 4 pm are deposited by microwave-assisted eVD using a CH4/H2/Ar gas mixture (1/4/95%). B2H6, diluted... 

Figure 11 shows cyclic voltammetric i-E curves for (A) Fe(CN)e ", (B) Ru(NH3)e (C) IrCl6 / (D) methyl viologen (MV ) in 1 M KCl, and (E) 4-tert-butylcatechol, and (F) Fe in 0.1 M HCIO4 at a boron-doped nanocrystalline diamond thin film electrode. The potential scan rate (v) was 0.1 V/s. The Ep for these redox systems ranges from... 

Cyclic Voltammetric Data for Aqueous-Based Redox Systems at a Boron-Doped Nanocrystalline Diamond Thin-Film Electrode... 

FIG. 16. Differential pulse anodic-stripping voltammetric curves for Ag(I), PB(II), and Cd(II) for a boron-doped nanocrystalline diamond thin-film electrode in 0.1 M acetate buffer, pH 4.5. The metal ion concentrations are (a) 10, (b) 1, and (c) 0.5 pM. Preconcentration at —1000 mV for 3 min (no stirring). (Reprinted with permission from Chem. Mater. 2003, 15, 879. Copyright (2003) American Chemical Society.) (From Ref 115.)... 

FIG. 20. Cyclic voltammetric i-E curves for 1 mM CAD, along with the corresponding background current (dashed line), in a 0.01 M borax buffer, pH 11.2, at (A) a boron-doped nanocrystalline diamond thin-film electrode and (B) a nanocrystaUine diamond thin-film electrode deposited without intentionally... 

FIG. 23. Transmission spectra for different materials in the (A) UV/Vis and (B) IR regions of the electromagnetic spectrum. The electrodes in (A) are (1) a thin film of ITO on quartz, (2) a thin film of boron-doped nanocrystalline diamond on quartz, (3) a thin film of mechanically polished and boron-doped diamond on an optically pure, white diamond substrate, and (4) a free-standing, boron-doped, and mechanically polished diamond disc. The electrodes in (B) are (5) an optically pure and mechanically polished white diamond disc, (6) an undoped and polished (both sides) Si substrate, and (7 and 8) moderately and heavily boron-doped microcrystalline diamond thin films deposited on the undoped Si. (Reprinted with permission from Interface 2003, 12, 33. Copyright (2003) The Electrochemical Society, Inc.) (From Ref. 158.)... 

Barek J, Jandova K, Peckova K et al (2007) Voltammetric determinatiim of aminobiphcmyls at a boron-doped nanocrystalline diamond film electrode. Talanta 74 421-426... 

Muna, G. W., Tasheva, N. and Swain, G. M. (2004), Electro-oxidation and amperometric detection of chlorinated phenols at boron-doped diamond electrodes A comparison of microcrystalline and nanocrystalline thin films. Environ. Sci. Technol., 38(13) 3674-3682. 

FIG. 2. SEM images of boron-doped (A) microcrystalline and (B) nanocrystalline diamond thin films. 

Figure 7 shows x-ray diffraction patterns for moderately boron-doped ( 10 cm ) microcrystalline and nanocrystalline diamond thin... 

FIG. 7. X-ray diffraction patterns for a boron-doped (a) microcrystalline and (b) nanocrystalline diamond thin film. 

Figure 8 shows visible-Raman spectra for moderately boron-doped ( — 10 cm ) microcrystalline and nanocrystalline diamond thin films. The spectrum for the microcrystalline film consists of the one-phonon diamond line centered at 1333 cm The line width (FWHM) is ca. 10 cm and, to a first approximation, is inversely related to the phonon lifetime [123,130]. The line position is negligibly shifted from that for a reference... 

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