Quartz substrates

Fig. 3. TEM images of CNTs obtained by CVD of nickel phthalocyanine on a quartz substrate at 800°C the bottom of the tube (right) and tip of the tube (left).

CNTs were also synthesized at lower temperatures starting from some metal phthalocyanines [18]. Nickel-, cobalt- and iron-phthalocyanines were deposited in vacuum and CNTs were grown perpendicularly on a quartz substrate at 700 and 800°C at relatively high yield. At the base of the nanotubes, a cluster of metal... 

The PL spectrum and onset of the absorption spectrum of poly(2,5-dioctyloxy-para-phenylene vinylene) (DOO-PPV) are shown in Figure 7-8b. The PL spectrum exhibits several phonon replica at 1.8, 1.98, and 2.15 eV. The PL spectrum is not corrected for the system spectral response or self-absorption. These corrections would affect the relative intensities of the peaks, but not their positions. The highest energy peak is taken as the zero-phonon (0-0) transition and the two lower peaks correspond to one- and two-phonon transitions (1-0 and 2-0, respectively). The 2-0 transition is significantly broader than the 0-0 transition. This could be explained by the existence of several unresolved phonon modes which couple to electronic transitions. In this section we concentrate on films and dilute solutions of DOO-PPV, though similar measurements have been carried out on MEH-PPV [23]. Fresh DOO-PPV thin films were cast from chloroform solutions of 5% molar concentration onto quartz substrates the films were kept under constant vacuum. 

Single-phase tantalum diboride of composition TaB, <,o-TaB, 5 is deposited using reaction (e) on a quartz substrate when the B/Ta ratio in the source gas is higher than 1.5, and T > 1000°C. At lower T and B/Ta ratios, deposition of metallic Ta is predominant. On substrates containing Ni or Pd impurities, woolly crystals up to 100 m in length can be grown in 30 min at 1050°C. As in the case of NbBj, a tip-VLS mechanism of growth is presumed . 

The SEM pictures were shown in Fig. 3 were scale layers stripped flnm different sections of quartz rod. Fig. 3(a) was a cross sectional profile of scale from the severe scaled point. Level (1) was quartz rod substrate scale tightly appressed to level (1) was named level (2). It could be seen from Fig. 3(a) that there was no obvious interface between the scale and quartz substrate. The positive face of this scale block was shown in Fig. 3(b) and the scale stripped from the smooth scaled point was shown in Fig. 3(c). Compared with Fig. 3(b), there were less agglomerations and shorter whisker columns in Fig. 3(c). The XRD patterns were shown... 

Monolayer films with the alkanethiol-capped ZnS Mn nanoparticles were fabricated on quartz substrates by the layer-by-layer method using a self-assembled monolayer of 1,6-hexanedithiol. 

On the basis of the observations, the enhancements of the p-values for the Q-Zni x MrLxS monolayer films can most likely be ascribed to the interaction between Mn ion as a magnetic ion and the external magnetic field. The enhancements are probably caused by magnetic orientation of the Q-Zni-xiMn S on the quartz substrates. 

We used polycrystalline films of ZnO and Sn02 as adsorbents. The films were deposited from the water suspension of respective oxides on quartz substrates. These substrates contained initially sintered contacts made of platinum paste. The gap between contacts was of about lO" cm. All samples were initially heated in air during one hour at T 500 C. We used purified molecular oxygen an acceptor particle gas. H and Zn atoms as well as molecules of CO were used as donor particles. We monitored both the kinetics of the change of ohmic electric conductivity and the tangent of inclination angle of pre-relaxation VAC caused by adsorption of above gases and the dependence of stationary values of characteristics in question as functions of concentrations of active particles. 

The most reliable and easy to control method of oxide films application is provided by either sputtering of an oxide layer (e. g., by a laser beiun), or evaporation of a thin metal zinc film (its resistance is usually 5-10 Ohm) from tantalum vessel onto a thoroughly prepared clean quartz substrate in a vacuum of Torr (containing no oil and... 

Rhodamine B 67 is frequently used in the quantitative determination of DNA or RNA and fluorescent labeling for DNA [190-192]. This dye was assembled onto the surface of a quartz substrate by electrostatic interaction between the fluorescence reagent RB and y-aminopropyltriethoxysilane (APES), and the Quartz/ APES/RB film was constructed (Fig. 1) [193]. 

Figure 3. Scanning electron micrographs of palladium features on quartz substrate as a function of laser power (measured on target) and scan speed. Palladium acetate precursor film thickness is 1.5 pm (cw Ar+ laser - 5145A line, spot size —0.8 pm FWHM).

Meier M., Wokaun A., Vo-Dinh T., Silver particles on stochastic quartz substrates providing tenfold increase in Raman enhancement, JJ. Phys. Chem. 1985 89 1843-1846. 

Figure 4. Absorption spectrum in the visible region of the multilayer polydiacetylene film deposited on a quartz substrate. Note the sharp absorption edge.

Fig. 30. Hydrogen spin lattice relaxation time T, in a-Si H against temperature for flake samples removed from their substrate (solid line) and for a-Si H on quartz substrates two weeks after deposition (triangles). The circle data points are for the quartz substrate samples ten months after deposition. The magnitude of the 40 K minimum of T, is inversely portional to the number of H2 molecules contributing to the relaxation process (Van-derheiden et al., 1987). 

Interference filters consist of several evaporated dielectric layers on a glass or quartz substrate. Their transmittance can be tailored by choosing appropriate layers. A problem is their limited bandwidth of transmission which is usually above AT. = 30 nm. Also, a substantial loss in sensitivity has to be accepted since the maximum transmission is limited to less than 40%. 

For the fabrication of noncentrosymmetric LB films, a two-compartment Langmuir trough, of which detail is given in the section 1.4, was used. Monolayers of pyrazine derivatives and arachidic add were spread on each compartmentalized subphase (BaC or CdCl aqueous solution, 2 x 10"4 M). The monolayers were compressed to 30 mNm 1, and then monolayers of pyrazine derivatives and arachidic acid were deposited fused quartz substrates in up stroke and down stroke, respectively. The aggregation structure in the LB films was studies by the absorption spectra and X-ray diffraction. 

Using the refractive index value of the pyrazine LB film, we calculated the mode dispersion curves of the TM fundamental and the TM second-harmonic waves in the waveguide device composed of a waveguiding pyrazine layer and a fused quartz substrate when Nd YAG laser is used as a fundamental light (Fig. 18). These curves show that the Cerenkov type phase matching is possible in the range of the thickness from 410 nm to 510 nm. 

Three kinds of PAV films was prepared using methoxy pendant precursors. The chemical structures and synthetic route of the PAV films used in this study are shown in Fig. 19. The details of synthesis of the methoxy pendant precursors have been described in refs. 29 and 30. The precursors were soluble in conventional organic solvents, for example, chloroform, dichloromethane, benzene and so on. The precursor polymer thin films were spin-coated on fused quartz substrates from the chloroform solutions. The precursor films were converted to PAV films by the heat-treatment at 250 0 under a nitrogen flow with a slight amount of HC1 as a catalyst. This method provided high performance PAV films with excellent optical quality. 

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