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Conducting ultrathin films

Y. Nishikata, M.-A. Kakimoto, and Y. Imai, Preparation of a conducting ultrathin film of poly(p-phenylene vinylene) using a Langmuir-Blodgett technique, J. Chem. Soc. Chem. Commun. 1988 1040. [Pg.358]

The list of materials which displayed such type of behaviour contains amorphous Mo Gei j, [1] and Moa,Sii a [2] films, amorphous InOx films [3, 4], ultrathin films of Be [5], crystalline films of Nd2-a Cea Cu04+y [6, 7]. Two typical examples of such sets of curves relevant to different limits are presented in Figs. 1 and 2. In Nd2-a Cea Cu04+ / (Fig. 1) the growth of the resistance with decreasing temperature on the non-superconducting side of the field-induced transition was below ten percent so that it reminded more a metal with quantum corrections to its conductivity than an insulator. In amorphous InO (Fig. 2), typical for insulator exponential temperature dependence of the resistance resulted in almost tenfold increase of the resistance. [Pg.83]

FTIR spectroscopy has become a standard technique for investigating Idle structure and level of orientational order of ultrathin films, that is, films in the submicron range (2.5 to 500 nm) (9). By combining transmission spectroscopy with infrared reflection-absorption spectroscopy (this technique is also referred to as grazing incidence reflection), the orientation of the functional groups of the molecules in the film can be investigated. These measurements are nondestructive to the film and can be conducted at a range of temperatures and pressures. [Pg.178]

Liljeroth et al. [80] used SECM in the feedback mode to study the electronic conductivity of a film of gold nanoparticles deposited at various pressures on a nonconductive substrate. They were able to observe an insulator-to-metal transition associated with a change in surface pressure. Unwin Whitworth et al. [83] have also developed a method to determine the electronic conductivity of ultrathin films using SECM under steady-state conditions. They obtained analytical approximations for the fitting of approach curves. The usefulness of their approach was demonstrated by investigating the effect of surface pressure on conductivity of a polyaniline monolayer at the water-air interface. [Pg.225]

Scanning probe microscopies are now able to study in situ the growth of metal clusters. These studies are performed sequentially after deposition. On metal/metal systems it has been possible to follow the nucleation kinetics and to derive the elementary energies like adsorption and diffusion energies (see the excellent review by Brune [68]). On oxide surfaces only recently such studies have been undertaken. STM can be only used on conducting samples, however it is possible to use as a support an ultrathin film of oxide grown on a metal. By this way it has been possible to study the nucleation of several... [Pg.254]

The LB technique enables us to obtain ultrathin films with the structures and thicknesses controlled at the molecular level, which promises applications to various fields. One of the challenges is to construct a new type of switching device based on conductive LB films. For this purpose, a supramolecular system is used since the geometrical alignment of the functional units are defined by the molecular design of the supermolecules to be used. [Pg.776]

Analyses of ultrathin films are also conducted via spectroscopic methods, but higher sensitivity is usually required. tt-A isotherm measurement... [Pg.140]

Other biomolecules imaged have included all DNA bases [44], polysaccharides [45] and proteins [46, 42], In many cases there is strong evidence that the imaging process is facilitated by the presence of ultrathin (conducting) water films on the surface of the sample [48,49 and 50]. [Pg.1685]

Ram M. K., Yavuz O., and Aldissi M., Gas sensors based on ultrathin films of conducting polymers, in Colloidal Nanoparticles in Biotechnology, ed. Abdelhamid Elaissari (New Jersey John Wiley Sons, 2008), 223-245. [Pg.66]

The use of an SECM to probe the surface conductivity of ultrathin films has been proposed [162]. Lateral conductivity of poly(3-hexylthiophene) films containing gold nanoparticles in addition was measured with an SECM in the feedback mode [163]. [Pg.269]

Ultrathin films in the nanometer range of poly(metal tetrathiooxalates) (M = Cu(II), Ni(II), Pd(II), Co(II)) have been prepared by sequential adsorption of divalent metal cations and tetrathiooxalate dianions on charged substrates (quartz slides with an upper layer of poly(allylamine hydrochloride) as shown in Eq. 7-11 [70]. Non-modified ITO glass or ZnSe substrates have also been also used. The modified quartz slide was dipped alternately into aqueous solutions of the tetrathiooxalate and a metal salt, and cleaned in between. The dark-brownish layers show a very broad absorption extending from the UV to the NIR. The electrical conductivities are in the order of 10 S cm" . [Pg.287]

Figure 14.6 Sensing ofHCI and NH3 using PPy/carbon nanofiber composites (a) SEM image of the nanofiber mat and (b) TEM of a single composite nanofibers (c) responses of the composite nanocables (a and b) and bulk PPy (c and d) to NHj (a and c) and HC (b and d) (Reprinted with permission from Sensors and Actuators B Chemical, CO gas sensing from ultrathin nano-composite conducting polymer film byM. K. Ram, O. Yavuz, f. Lahsangah and M. Aldissi, 106, 2, 750-757. Copyright (2005) Elsevier Ltd)... Figure 14.6 Sensing ofHCI and NH3 using PPy/carbon nanofiber composites (a) SEM image of the nanofiber mat and (b) TEM of a single composite nanofibers (c) responses of the composite nanocables (a and b) and bulk PPy (c and d) to NHj (a and c) and HC (b and d) (Reprinted with permission from Sensors and Actuators B Chemical, CO gas sensing from ultrathin nano-composite conducting polymer film byM. K. Ram, O. Yavuz, f. Lahsangah and M. Aldissi, 106, 2, 750-757. Copyright (2005) Elsevier Ltd)...
Figure 16.4 Electrochemical corrosion cell used for testing the ennobling effect of a conducting polymer. The mild steel sample (1) is coated by a thin epoxy layer and is in contact with a 0.1 M UCIO4 solution (aerated or deaerated) through a small hole. Polymethylthiophene (PMT) is deposited on a Pt electrode (2) a saturated calomel electrode (3) and a Pt counter-electrode (4) are used with either (1) or (2) as the working electrode. Electrodes (1) and (2) are galvanically connected and can be disconnected from the electrical circuit for specific measurements. (Reprinted with permission from Electrochimica Acta, Corrosion protection by ultrathin films of conducting polymers by U. Rammelt, P.T. Nguyen and W. Plieth, 48, 9, 1257-1262. Copyright (2003) Elsevier Ltd)... Figure 16.4 Electrochemical corrosion cell used for testing the ennobling effect of a conducting polymer. The mild steel sample (1) is coated by a thin epoxy layer and is in contact with a 0.1 M UCIO4 solution (aerated or deaerated) through a small hole. Polymethylthiophene (PMT) is deposited on a Pt electrode (2) a saturated calomel electrode (3) and a Pt counter-electrode (4) are used with either (1) or (2) as the working electrode. Electrodes (1) and (2) are galvanically connected and can be disconnected from the electrical circuit for specific measurements. (Reprinted with permission from Electrochimica Acta, Corrosion protection by ultrathin films of conducting polymers by U. Rammelt, P.T. Nguyen and W. Plieth, 48, 9, 1257-1262. Copyright (2003) Elsevier Ltd)...
U. Rammelt, P.T. Nguyen, and W. PUeth, Corrosion protection by ultrathin films of conducting polymers, Electrochinu Acta, 48, 1257 1262 (2003). [Pg.675]


See other pages where Conducting ultrathin films is mentioned: [Pg.144]    [Pg.57]    [Pg.419]    [Pg.433]    [Pg.272]    [Pg.110]    [Pg.591]    [Pg.523]    [Pg.156]    [Pg.307]    [Pg.46]    [Pg.153]    [Pg.373]    [Pg.615]    [Pg.711]    [Pg.141]    [Pg.94]    [Pg.126]    [Pg.523]    [Pg.512]    [Pg.1691]    [Pg.462]    [Pg.46]    [Pg.62]    [Pg.66]    [Pg.381]    [Pg.282]    [Pg.76]    [Pg.222]    [Pg.416]    [Pg.430]    [Pg.581]    [Pg.68]    [Pg.598]    [Pg.112]   
See also in sourсe #XX -- [ Pg.523 ]

See also in sourсe #XX -- [ Pg.523 ]




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Film conductance

Films conducting

Films conductive

Films conductivity

Ultrathin

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