Mica film image

Fig. 26a. Scanning tunneling microscopic image of a 310nmx310nm area of bare Au film epitaxially grown on a mica substrate (Au mica) measured in air constant current mode bias (Vb) of + 50 mV, tunneling current (I,) of 10 nA. b STM image of a 3.5 nm x 3.5 nm area of a bare Au/mica film constant current mode Vb = 4- 4.9 mV I, = 3.0 nA [219]...

Fig. 3. (a) SEM image of the particle track-etched polycarbonate membrane, with a pore diameter of 1 (im (Martin, 1994). (b) SEM image of 2-/xm pores in a single-crystal mica film prepared by particle track-etching (Sun et al., 2000a). 

Figure Bl.19.27. AFM topographic images (7x7 pm ) of 20 epitaxial Ag films on mica prepared at five substrate temperatures (75, 135, 200, 275, and 350 °C) and four film thicknesses (50, 110, 200, and 300 mn)...

AFM images of PET film surfaces have also recently been measured [156] and they showed a microroughness of PET films of the order of 1 nm averaged over a surface area of 200 x 200 nmJ. In some cases atomic lateral resolution is achieved [39] when e.g. dialkylamonium (C16) layers adsorbed on mica from cyclohexane are examined [157]. The interpretation of AFM data is at present not always clear and further advances will be made with improved instrumentation. Up till now, only very specific examples of polymeric structure have been investigated,... 

FIG. 8 SPFM image showing H2SO4 droplets deposited on mica at low humidity (<5%). The region between drops is covered by a thin acid film (see text). 

Figure 12.5 AFM images of thin PS-b-P4VP (20000 19000) films (3-pentanone solvent) with worm-like structures on mica substrates and height profiles of horizontal lines in these images, (a), (d) Before and (b), (e) after being doped with TCPP. (c), (f) TCPP-doped films irradiated with fluence of about ISOmJcm in air. (d)-(f) show the height profiles of the...

Figure 12.6 AFM images of a transferred film G2 (a) and G 3 (b) on freshly cleaved mica surface [24]...

Figure 12.11 Tapping Mode AFM image of G9 PAMAM dendrimer molecules on mica surface. Sample prepared by placing 6 jA of a dilute aqueous solution, cone. 5x 10-3% (w/w) G9 on a freshly cleaved mica surface and allowing the film to dry slowly at room temperature (provided by Jing Li and D. A. Tomalia)...

The atomic force microscope (AFM) has been used to investigate LB film quality and other properties and to obtain sizes and distributions of MC produced within LB films. For example, in an image of a three-layer CuAr film on mica, large pits were evident (9). In a cross-section analysis a stepped drop of 7.5 nm to the substrate was consistent with three monolayers of an M-Ar film ( 2.5 nm per layer). The thickness of LB films can also be obtained in good-quality films by excavating down to the substrate by the AFM tip in contact mode (45,80). 

AFM images were obtained for films constructed, on freshly cleaved mica, from compressed monolayers of DDAB on a subphase of HMP-stabilized CdS (81). Particles, with dimensions of 8 3 nm, were seen to be evenly distributed. The determined area of 58 nm2/particle coincided well with the area per molecule determined for DDAB from its spreading isotherm, implying 1 1 particle/surfactant stoichiometry. This result is puzzling given that freshly cleaved mica is hydrophilic and therefore any particles would be buried under a layer of the hydrophobic tails of the DDAB and unaccessable to the AFM tip. 

AFM images of the CuSv (9) and PdS (74) particles on mica gave mean particle sizes of 4.1 nm and 4.8 nm, respectively. The images were obtained after washing the H2S-exposed CuAr films with CHCI3. 

Fig. 3.5.11 AFM contact mode image of CdS particles made in CdAr bilayer film deposited on mica, exposed to H2S and subsequently immersed in CHC13 to remove excess surfactant.

Fig. 6 a Schematic drawing of the measured sample, with DNA molecules combed between Re/G electrodes on a mica substrate, b AFM image showing DNA molecules combed on the Re/C bilayer. The large vertical arrow indicates the direction of the solution flow, used to deposit the DNA. The small arrows point towards the combed molecules. Note the forest structure of the carbon film, c DC resistance as a function of temperature on a large temperature scale for three different samples, showing the power law behavior down to 1 K (from [60], with permission Copyright 2001 by Science)... 

Fig. 27a-d. STM image of a 100 nm x 100 nm a n-oetadecanethiol film coated on Au/mica b same area after 10 s of etching mode (Vb = 10 mV, I, = 10 nA) over a 10 nm x 10 nm area (within area shown by broken line% c same area after 10 min of continuous normal scanning d after 35 min normal scanning. All images were taken in constant current mode, Vb = + 1V, and I, = 1 nA [219]... 

Fig. 22. Phase image of a thin film of a hydrogenated polybutadiene-polyethyleneoxide blockcopolymer (3700-2900 g/mol) on mica. The film was crystallised at 38 C close to a triple line caused by dewetting. Courtesy of G. Reiter [275]...

Fig. 31. Three-dimensional images of droplets of the carbosilane dendrimer with hydroxyl end groups obtained during spreading at ambient conditions on a mica substrate [320]. The images corresponds to different duration of spreading (a - 10 min and b - 24 h), where a precursor film of 2 nm in thickness develops at the contact line in (b). The thickness corresponds to the diameter of a dendrimer molecule...

The dendrimer droplets were used as a tool to examine surface heterogeneity on the nanoscale [319]. Figure 32 shows two pairs of SFM images of the droplets deposited on mica (a,b) and a copolymer film (c,d), respectively. On mica, the hydroxyl terminated dendrimer showed the autophobic or pseudo-partial wetting behaviour as the droplets sit on a thin film of the same material [312,320]. 

Fig. 34. SFM amplitude images of the oligo(hexafluoropropene) substituted PMA films on mica after annealing at room temperature for 50 h [324]. Depending on the number ol HFPO units, polymers exhibit either a autophobic wetting behaviour for HFP05 or b stable coverage with a 10 nm thick film for HFP03...

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