Unilamellar colloids of graphite oxide (GO) were prepared from natural graphite and were grown as monolayer and multilayer thin films on cationic surfaces by electrostatic selfassembly. The multilayer films were grown by alternate adsorption of anionic GO sheets and cationic poly(allylamine hydrochloride) (PAH). The monolayer films consisted of 11-14 Å thick GO sheets, with lateral dimensions between 150 nm and 9 µm. Silicon substrates primed with amine monolayers gave partial GO monolayers, but surfaces primed with Al 13 O 4 -(OH) 24 (H 2 O) 12 7+ ions gave densely tiled films that covered approximately 90% of the surface. When alkaline GO colloids were used, the monolayer assembly process selected the largest sheets (from 900 nm to 9 µm) from the suspension. In this case, many of the flexible sheets appeared folded in AFM images. Multilayer (GO/PAH) n films were invariably thicker than expected from the individual thicknesses of the sheets and the polymer monolayers, and this behavior is also attributed to folding of the sheets. Multilayer (GO/PAH) n and (GO/ polyaniline) n films grown between indium-tin oxide and Pt electrodes show diodelike behavior, and higher currents are observed with the conductive polyaniline-containing films. The resisitivity of these films is decreased, as expected, by partial reduction of GO to carbon.

This letter describes an electric-field assisted assembly technique used to position individual nanowires suspended in a dielectric medium between two electrodes defined lithographically on a SiO 2 substrate. During the assembly process, the forces that induce alignment are a result of nanowire polarization in the applied alternating electric field. This alignment approach has facilitated rapid electrical characterization of 350-and 70-nm-diameter Au nanowires, which had room-temperature resistivities of approximately 2.9 and 4.5ϫ10 Ϫ6 ⍀ cm.

CDCl 3 ) d 8.14±8.27 (m, 2 Ar±H, o to ±COOAr), 7.58±7.71 (m, 8 Ar±H, m to ±COOAr, m to ±CH 2 O±, m to ArCOO± and m to ±OOCAr), 7.25±7.32 (m, 4 Ar±H, o to ±CH 2 O± and o to ArCOO±), 6.96±7.04 (m, 4 Ar±H, o to ±OCH 2 (CH 2 ) 11 ± and o to ±OOCAr), 4.20 (t, 2H, ArOCH 2 CH 2 O±), 4.05 (t, 2 H, ArOCH 2 (CH 2 ) 10 ±, J=6.6 Hz), 3.54±4.00 (m, 68 H, ±CH 2 O±), 3.37 (s, 3 H, CH 3 O±), 1.77±1.85 (m, 2 H, ±CH 2 (CH 2 ) 9 ±), 1.14±1.47 (m, 18 H, ±CH 2 (CH 2 ) 9 ±), 0.87 (t, 3 H, CH 3 (CH 2 ) 11 ±, J=6.8

The coverage of Au surfaces with Au nanowires by linking them with DNA offers great prospects for the assembly of wire structures with particular connectivity. This work presents the first example of using DNA hybridization to control the assembly of micrometer‐size inorganic particles on surfaces. The Figure shows the optical microscopy image of Au nanowires modified with DNA.

Layered double hydroxide (LDH) single-layer nanosheets were traditionally prepared through a multi-step exfoliation process which is very time-consuming and of low efficiency. Herein we report the preparation of LDH single-layer nanosheets through a facile direct synthesis method. By introducing a layer growth inhibitor, one can directly synthesize LDH single-layer nanosheets instead of LDH layered compounds. The inhibitor weakens the interactions between neighboring layers, thus preventing the interlayer growth. This investigation on blocking interlayer growth by weakening interlayer interactions to obtain inorganic single-layer nanosheets opens a new route for the synthesis of 2-dimensional materials.