Guobin Luo

Fabrication of a Covalently Attached Multilayer Film via In‐Situ Reaction

A covalently linked ultrathin multilayer film was fabricated from 2-nitro-N-methyl-diphenylamine-4-diazonium-formaldehyde resin (NDR) and phenol-formaldehyde resin (PR) in methanol-in-situ. The UV-vis, XRD, AFM and FTIR show that this multilayer is of high regularity, smoothness and stability.

Self‐assembled multilayer films based on diazoresins studied by atomic force microscopy/friction force microscopy

The layer-by-layer self-assembled NDR-PSS (nitro-containing diazoresin-polysodium p-styrenesulfonate) films were fabricated. The crosslinking structure formed from the conversion of ionic bond to covalent bond after UV irradiation, confirmed by small angle X-ray diffraction. The roughness and microtribological properties of NDR-PSS films were investigated by atomic force microscopy/friction force microscopy. The ordered multilayer films after photoreaction are better in microtribological performance than that of the monolayer film.

Fabrication and their photoelectric conversion properties of two kinds of self-assembled monolayers and Langmuir–Blodgett film of mono-substituted C60-malonic acid

Two kinds of self-assembled monolayer (SAM) and a Langmuir–Blodgett film of fullerene derivative C61(COOH)2 that have the photoelectric conversion property were first reported here. The SAMs were either fabricated directly on hydrophilic indium–tin-oxide (ITO), quartz, and mica by esterification reaction or on the aminopropylsilanated substrates by amide bonds. The SAMs were characterized by contact angle, AFM, UV spectrum and cyclic voltammetry. The film thickness calculated by molecular mechanic with the MM2 method in Molgen 4.0 coincided with that obtained by AFM measurement, indicating the formation of monolayer. All of three systems can generate stable cathodic photocurrent. The separated charge loss process in our systems is monomolecule recombination.

Synthesis, monolayer fabrication and photoelectric conversion property of two pyrrolidinofullerene carboxylic acid derivatives

Abstract Two kinds of covalently tethered fullerene monolayers, which exhibit the photoelectric conversion property, are reported. The monolayers were fabricated on hydrophilic indium–tin oxide (ITO), quartz, and mica by an esterification reaction and characterized by contact angle, AFM, UV spectrum, and cyclic voltammetry. The thicknesses of the films calculated by the MM2 molecular mechanics method were in good agreement with the results of AFM, indicating the formation of monolayers. The photoelectric conversion properties of both monolayers were studied.

Ultrathin film fabricated from PDDAC/DSB and NDR/DSB

Abstract Two kinds of ultrathin films were successfully fabricated by the self-assembly deposition technique from poly(diallyldimethylammonium chloride) (PDDAC) or nitro-containing diazoresin (NDR) as the polycation and 4,4′-di(sodium styryl-2-sulfonate) biphenyl (DSB) as the dianion. This stepwise fabrication process was monitored by UV-vis spectrometry. The regularity of the film and the morphology of the film surface were examined by X-ray diffraction (XRD) and atom force microscopy (AFM), respectively. The results show that these kinds of films are composed of well-arranged molecules, and have a very flat surface. Among them, the PDDAC/DSB film emits fluorescence when excited with UV light at 354 nm. The NDR/DSB film does not emit fluorescence, because the NDR quenches the fluorescence of DSB; however, the NDR/DSB film possesses more stability against solvent etching (such as DMF), compared with the PDDAC/DSB film.