Monolayer atomic force microscopy

Giancarlo L C and Flynn G W 1988 Scanning tunneling and atomic force microscopy probes of self-assembled, physisorbed monolayers A/ / . Rev. Phys. Chem. 49 297... 

The very new techniques of scanning tunnelling microscopy (STM) and atomic force microscopy (AFM) have yet to establish themselves in the field of corrosion science. These techniques are capable of revealing surface structure to atomic resolution, and are totally undamaging to the surface. They can be used in principle in any environment in situ, even under polarization within an electrolyte. Their application to date has been chiefly to clean metal surfaces and surfaces carrying single monolayers of adsorbed material, rendering examination of the adsorption of inhibitors possible. They will indubitably find use in passive film analysis. 

We studied the surface pressure area isotherms of PS II core complex at different concentrations of NaCl in the subphase (Fig. 2). Addition of NaCl solution greatly enhanced the stability of monolayer of PS II core complex particles at the air-water interface. The n-A curves at subphases of 100 mM and 200 mM NaCl clearly demonstrated that PS II core complexes can be compressed to a relatively high surface pressure (40mN/m), before the monolayer collapses under our experimental conditions. Moreover, the average particle size calculated from tt-A curves using the total amount of protein complex is about 320 nm. This observation agrees well with the particle size directly observed using atomic force microscopy [8], and indicates that nearly all the protein complexes stay at the water surface and form a well-structured monolayer. 

Wold DV, Haag R, Rampi MA, Frisbie CD (2002) Distance dependence of electron tunneling through self-assembled monolayers measured by conducting probe atomic force microscopy unsaturated versus saturated molecular junctions. J Phys Chem B 106 2813-2816... 

Atomic force microscopy (AFM) can be used to obtain high-resolution imagery of molecular orientation and ordering for materials adsorbed onto substrates. Early AFM studies on gluconamides were hampered by the tendency of the fibers to unravel on substrates forming bilayer sheets.41 These layers showed the head-to-tail packing of a monolayer which is similar to the crystal structure reported for anhydrous gluconamides.38 A procedure to retain the fiber networks on surfaces with the addition of a small fraction of... 

Direct observation of edge dislocation in lignoceric acid monolayer based on atomic force microscopy. 

In the present review, first we will describe how to fabricate artificial photosynthetic reaction center in nanometer scales by making use of phase separation in mixed monolayers of hydrocarbon (HC) and fluorocarbon (FC) amphiphiles [2,5,20-26] as shown in Fig. 2b [3]. The phase separated structures were studied by SPMs such as AFM, SSPM, and scanning near-field optical/atomic force microscopy (SNOAM) [27-33] as well as a conventional local surface analysis by SIMS [3,5], The model anionic and cationic HC amphiphilic... 

An ordered antibody array has also been assembled on the solid surface by a combination of Langmuir Blodgett (LB) film method and self-assembling method. An ordered monolayer of protein A is deposited on the solid surface by LB method, which is followed by self-assembling of antibody. Individual antigen molecules which are complexed with the antibody array have been quantitated selectively by atomic force microscopy (AFM). 

Pursch, M., Vanderhart, D.L., Sander, L.C., Gu, X., Nguyen, T., and Wise, S.A., C30 self-assembled monolayers on sihca, titania and zirconia HPLC performance, atomic force microscopy and NMR studies of molecular dynamics and uniformity of coverage, J. Am. Chem. Soc., 6997, 2000. 

The functionalization of H—Si(l 11) surfaces has been extended to the reaction with aldehydes. Indeed, H—Si(lll) reacts thermally (16 h at 85 °C) with decanal to form the corresponding Si—OCH2R monolayer that has been characterized by ATR-FTIR, XPS and atomic force microscopy (AFM) [63]. The reaction is thought to proceed either by a radical chain mechanism via adventitious radical initiation or by nucleophilic addition/hydride transfer. On the other hand, the reaction of H—Si(lll) with octadecanal activated by irradiation with a 150W mercury vapour lamp (21 h at 20-50 °C) afforded a R... 

P7 We will begin with a study of the topography of an n-alkanethiol self-assembled monolayer (SAM) anchored to a Au(lll) substrate. Alkanethiols will be attached to a Au(lll) substate by published methods. The SAM will be imaged by atomic force microscopy (AFM) to assure that the known structure is observed. (From Spain, 1997)... 

Fig. 3 Pentacene grown by supersonic molecular beam deposition to form near monolayer p-type FETs with thiolate monolayer modified Au source and drain contacts (a) visualized by atomic force microscopy and with well-behaved (b) /d-Eds and (c) -Eg characteristics...

Fig. 6 (a) Scanning electron and (b) atomic force microscopy images of copper phthalocyanine Langmuir-Blodgett monolayer FETs. (c) Hole field-effect mobility as a function of the copper phthalocyanine channel length... 

Vandamme N, Snauwaert J, Janssens E, Vandeweert E, Lievens P, Van Haesendonck C (2004) Visualization of gold clusters deposited on a dithiol self-assembled monolayer by tapping mode atomic force microscopy. Surf Sci 558 57-64... 

Fig. 5.39 Atomic force microscopy profiles of a crystal of PEO41PBO22PEO41 on silicon (Hamley et al. 1998). (a) Surface plot showing the edge of a monolayer crystal, (b) Topography of steps, showing typical heights.

The left picture shows aggregates of silicon oxide particles with a diameter of 0.9 pm (see example 1.1). At the bottom an atomic force microscope image of cylindrical CTAB micelles adsorbed to gold(lll) is shown (see example 12.3, width 200 nm). The right image was also obtained by atomic force microscopy. It shows the surface of a self-assembled monolayer of long-chain alkylthiols on gold(lll) (see fig. 10.2, width 3.2 nm). 

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