Self-assembly growth

Y. Chen, D. A. A. Ohlberg, G. Madeiros-Ribeiro and Y. A. Chang, Self-assembled growth of epitaxial erbium disilicide nanowires on silicon (001), Appl. Phys. Lett. 76, 4004 (2000). 

Supported zeolite membranes have been prepared using numerous procedures [4] such as alignment of crystals in electrical fields, electroplating, self-assembly, growth on organic molecular layers, covalent linkages, hydrothermal synthesis (in situ and ex situ), hydrothermal method microwave heating assisted, dry gel method (vapor-phase transport method and steam-assisted crystallization), synthesis at the interface between two fluid phases, etc. 

Anodic porous alumina is conventionally grown on aluminum foils, as indicated in Fig. 2. Similar self-assembled growth is achieved on Si by depositing an A1 thin film on the front side of a silicon wafer and forming an ohmic contact on the back side that is used as anode. The electrochemical solutions currently used are oxalic or sulfuric acid aqueous solutions. Details for the fabrication of thin alumina templates on Si with adjustable pore size and density are given elsewhere [8]. Electrochemical oxidation of A1 starts from the A1 surface and continues down to the Al/Si interface, following an anodization current density/time curve as shown in Fig. 3. 

Yoshida, T., Miyamoto, K., Hibi, N., Sugiura, T., Minoura, H., Schlettwein, D., Oekermann, T., Schneider, G., and Wbhrle, D. (1998) Self assembled growth of nanoparticulate porous ZnO thin film modified by 2,9,16,23-tetras ulfophthalocyanatozinc(II) by one-step electrodeposition. Chem. Lett., 7, 599-600. 

Qiu T, Wu XL, Siu GG, Chu PK (2005) Self-assembled growth and green emission of gold nano whiskers. Appl Phys Lett 87 223115-1-223115-3 Qu Y, Liao L, Li Y, Zhang H, Huang Y, Duan X (2009) Electrically conductive and optically active porous silicon nanowires. Nano Lett 9(12) 4539 543 Qu Y, Zhong X, Li Y, Liao L, Huang Y, Duan X (2010) Photocatalytic properties of porous silicon nanowires. J Mater Chem 20(18) 3590-3594... 

The fabrication of polymer analogs of 8-hydroxyquinoline-based metal chelates (such as Alq3, etc.) for electroluminescence applications has been a challenging task. These metal chelate polymers are nontraditional polymers and are usually associated with considerable handling difficulties. Their major intricacy arises from complexation-decomplexation dynamics, which are very sensitive to the pH and ionic strength of the solute.(75) For linear metal chelate polymers, solubilization typically occurs only in polar aprotic solvents,(79) which are difficult to remove from spun films. The insoluble and intractable nature of these polymers makes them amenable to the self-assembly growth which is the subject of this paper. 

Scheme I illustrates the self-assembly growth of zinc-bisquinoline from 8,8 -dihydroxy-5,5 -biquinoline (bisquinoline). The reaction of bisquinoline with Zn(Et)2 is almost instantaneous. Figure 1 illustrates the ellipsometrically determined film thicknesses as a function of dip cycle. The two markedly different regimes (Stage I and Stage II) with growth rates of 8.3 and 26.5 A/dip cycle (d.c.) respectively, indicate a complex film growth. Films thicker than 250 A maintain the 26.5 A/d.c. growth rate as far as we have measured (c.a. 1,275 A).

Scheme 1. Schematic representation of the self-assembly growth of poly(zinc-bisquinoline).

Maointosh F C, Safran S A and Pinous P A 1990 Self-assembly of linear aggregates the effeot of eleotrostatios on growth Europhys. Lett. 12 697-702... 

Woodward J T, Ulman A and Schwartz D K Self-assembled monolayer growth of octadecylphosphonic acid on mica Langmuir 12 3626-9... 

Sarkar, J., Pal, P., and Talapatra, G. B., Self-Assembly of Silver Nano-particles on Stearic Acid Langmuir-Blodgett Film Evidence of Eractal Growth, Chem. Phys. Lett., Vol. 401, No. 4-6,2005, pp. 400 04. 

In the first step, lipid model membranes have been generated (Fig. 15) on the air/liquid interface, on a glass micropipette (see Section VIII.A.1), and on an aperture that separates two cells filled with subphase (see Section VIII.A.2). Further, amphiphilic lipid molecules have been self-assembled in an aqueous medium surrounding unilamellar vesicles (see Section VIII.A.3). Subsequently, the S-layer protein of B. coagulans E38/vl, B. stearother-mophilus PV72/p2, or B. sphaericus CCM 2177 have been injected into the aqueous subphase (Fig. 15). As on solid supports, crystal growth of S-layer lattices on planar or vesicular lipid films is initiated simultaneously at many randomly distributed nucleation... 

The formation of nanostructures such as nanodot arrays has drawn a great attention due to the feasible applications in a variety of functional structures and nanodevices containing optoelectronic device, information storage, and sensing media [1-3]. The various methods such as self-assembled nanodots from solution onto substrate, strain-induced growth, and template-based methods have been proposed for the fabrication of nanodot arrays on a large area, [4-6]. However, most of these works can be applied to the small scale systems due to the limited material systems. 

Shaikh AV, Rajaram SM, Pathan HM, Min BK, Joo OS, Han SH (2008) CdSe thin film growth Primarily amorphous nanograins to self-assembled nanowires. J Electroanal Chem 615 175-179... 

Toyoda T, Kobayashi J, Shen Q (2008) Correlation between crystal growth and photosensitization of nanostructured HO2 electrodes using supporting H substrates by self-assembled CdSe quantum dots. Thin SoUd Films 516 2426-2431... 

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