In general, fabrication of well-defined organic nanowires or nanobelts with controllable size and morphology is not as advanced for their inorganic counterparts. Whereas are widely exploited in optoelectronic nanodevices, there remains considerable untapped potential the one-dimensional (1D) materials. This Account describes our recent progress discoveries field 1D self-assembly planar pi-conjugated molecules application various nanodevices including optical electrical sensors. The aimed at...

Effect of side-chain substitutions on the morphology self-assembly perylene diimide molecules has been studied with two derivatives modified distinctly different side-chains, N,N'-di(dodecyl)-perylene-3,4,9,10-tetracarboxylic (DD-PTCDI) and N,N'-di(nonyldecyl)-perylene-3,4,9,10-tetracarboxylic (ND-PTCDI). Due to interference, results in totally morphologies aggregate: one-dimensional (1D) nanobelt vs zero-dimensional (0D) nanoparticle. The size, shape, topography self-assemblies were...

Nanobelt structures have been fabricated for an n-type semiconductor molecule, N,N'-di(propoxyethyl)perylene-3,4,9,10-tetracarboxylic diimide (PTCDI). The short alkyloxy side chain not only affords effective pi-pi stacking in polar solvents self-assembling but also provides sufficient solubility nonpolar solution processing. As revealed by both AFM and electron microscopies, the nanobelts approximately rectangular cross section, with a typical thickness of about 100 nm width range 300-500...

A new type of fluorescence sensory material has been developed from an alkoxycarbonyl-substituted carbazole-cornered tetracycle. Films fabricated such materials are shown to be efficient in detecting explosive vapor, probably owing the extended 1D molecular stacking between component molecules and intrinsic nanoporous morphology thus formed within film. The former facilitates long-range exciton migration, while latter favors adsorption diffusion gaseous adsorbates combination these two...

Ultralong nanobelts (>0.3 mm) have been fabricated from an asymmetric perylene tetracarboxylic diimide (PTCDI) molecule via a seeded self-assembly processing. The long length of facilitates the construction two-electrode devices employing nanobelt as channel material, and long-range one-dimensional π−π molecular stacking allows for efficient conductivity modulation through surface doping. A combination these two characters enables electrical sensing reducing VOCs using nanobelt. As examined...

An uninvited guest: In the photocatalytic oxidation of alcohols to their corresponding aldehydes or ketones using TiO2 in organic solvents, such as benzotrifluoride (BTF), an oxygen atom transfer from dioxygen α-carbon alcohol dominates reaction process. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited typeset. They made available submitted by authors. Please note: The publisher is responsible for content...

A new type of fluorescence sensory material with high sensitivity, selectivity, and photostability has been developed for vapor probing organic amines. The is primarily based on well-defined nanofibers fabricated from an n-type semiconductor molecule, N-(1-hexylheptyl)perylene-3,4,9,10-tetracarboxyl-3,4-anhydride-9,10-imide. Upon deposition onto a substrate, the entangled form meshlike, highly porous film, which enables expedient diffusion gaseous analyte molecules within film matrix,...

Intrinsic graphene is a semimetal or zero bandgap semiconductor, which hinders its applications for nanoelectronics. To develop high-performance nanodevices with graphene, it necessary to open the and precisely control charge carrier type density. In this perspective, we focus on tailoring electronic properties of by noncovalent stacking aromatic molecules through π–π interaction. Different types (functioning as either an electron donor acceptor when stacked graphene) reported in recent...

For photocatalytic removal of nitric oxide (NO), two major issues need to be addressed: incomplete oxidation NO and deactivation the photocatalyst. In this study, we aimed solve these problems by constructing an all-solid-state Z-scheme heterojunction (PI-g-C3N4) consisting g-C3N4 surface modified with perylene imides (PI). PI-g-C3N4 exhibits significant enhancement in activity (in comparison pristine g-C3N4) when examined for removal. More importantly, charge separation within populates...

Phosphate modified TiO2 photocatalysts were prepared by phosphoric acid treatment before or after crystallization. Substrates with different structures chosen to explore the photocatalytic activity of as-modified under UV irradiation. It was found that effect phosphate modification is definitely attributed surface-bound anion, and can affect both rates pathways reactions, which are great dependence on properties substrates. The degradation substrates (such as 4-chloropehenol, phenol,...

We have demonstrated a single molecule field effect transistor (FET) which consists of redox (perylene tetracarboxylic diimide) covalently bonded to source and drain electrode an electrochemical gate. By adjusting the gate voltage, energy levels empty molecular states are shifted Fermi level electrodes. This results in nearly 3 orders magnitude increase source-drain current, fashion n-type FET. The large current is attributed electron transport mediated by lowest when it lines up with level.

A Keggin polyoxometalate (POM, i.e., PW12O403-) and its lacunary derivative are immobilized on an anionic exchange resin through electrostatic interaction at pH 4.6 in aqueous dispersion. The resin-supported POM thus obtained catalyzes the efficient degradation of cationic dye pollutants presence H2O2 under visible-light irradiation. To evaluate photocatalytic system, a rhodamine B (RB) was investigated detail using UV−visible spectroscopy, high performance liquid chromatography, gas...

Amorphous, microporous TiO2 hybrid semiconductors modified with transition metals induce generation of a photocurrent and photocatalytic degradation the water contaminant 4-chlorophenol through photoinduced charge separation (the postulated mechanism is shown in picture, Ar=4-ClC6 H4 ). In contrast to previously known crystalline titania photocatalysts, which are active only when excited UV light, amorphous platinum, rhodium, gold chloride enable both processes also visible light.

Well-defined ultrathin nanoribbons have been fabricated from an amphiphilic electron donor-acceptor (D-A) supramolecule comprising perylene tetracarboxylic diimide as the backbone scaffold to enforce one-dimensional intermolecular assembly via strong pi-stacking. These demonstrated high photoconductivity upon illumination with white light. The thus obtained is likely due optimal molecular design that enables a good kinetic balance between two competitive processes, intramolecular charge...

Effective π-electron delocalization within a PTCDI nanobelt, for which the one-dimensional molecular arrangement is dominated by cofacial π−π stacking, has been characterized both electron spin resonance (ESR) spectrometry and current−voltage (I−V) measurement. The long-range enables dramatic enhancement of electrical conductivity nanobelt through external-charge doping. When immersed in saturated hydrazine vapor, about 3 orders magnitude increase was achieved implying potential application...

Aluminum(III)-modified TiO2 was prepared by sol–gel process via a sudden gelating method. The structure of the modified material and local environment aluminum were investigated using X-ray diffraction, HRTEM, XPS, 27Al MAS NMR, ξ-potential measurements. effect modification on interaction between dye photocatalyst, interfacial electron transfer process, thereby degradation pollutants under visible irradiation also examined FTIR spectra UV–vis diffuse reflectance spectra. It found that,...

Detecting structure, dynamics, and chemical reactions at the single-molecule level represents ultimate degree of sensitivity for sensing imaging. There is a tremendous need to develop new molecular systems methodology single-molecule-based sensing. This work presents first time spectroscopy probe which uses an intramolecular electron transfer mechanism detect binding, local interfacial processes. Moreover, we show how information about interaction these probes with their environment obtained...

Nanofibril structures have been fabricated from an arylene ethynylene macrocycle (AEM), which consists of a square frame corner-joined by four carbazole moieties. The fabrication was performed through gelating process cooling warm, homogeneous solution in cyclohexane at high temperature (e.g., 100 degrees C) to room temperature. During the gelation, molecules become organized, with optimal pi-pi stacking cooperation side-chain association. favorable facilitates 1D growth molecular assembly.

Fluorescent nanoscale coordination polymers with cubic morphology and long range ordered structure were fabricated exhibited efficient sensing for both nitroaromatic explosive nitromethane due to large surface area volume ratio strong binding affinity molecules.

A new type of fluorescent sensor has been developed from a perylene based molecule, N,N′-dideoxythymidine-3,4,9,10-perylene-tetracarboxylic diimide (TT-PTCDI); the strong, highly selective binding between thymine ligand (T) and Hg2+ ion enables efficient sensing mercury ions on fluorescence quenching mechanism, which is primarily caused by metal-coordination induced molecular aggregation.

Development of simple, cost-effective, and sensitive fluorescence-based sensors for explosives implies broad applications in homeland security, military operations, environmental industrial safety control. However, the reported fluorescence sensory materials (e.g., polymers) usually respond to a class analytes nitroaromatics), rather than single specific target. Hence, selective detection trace amounts trinitrotoluene (TNT) still remains big challenge sensors. Here we report TNT vapor using...

Excitonic transitions in organic semiconductors are associated with large oscillator strength that limits the excited-state lifetime and can turn impede long-range exciton migration. We present perylene-based emissive H-aggregate nanowires where lowest energy state is only weakly coupled to ground state, thus dramatically enhancing lifetime. Exciton migration occurs by thermally activated hopping, leading luminescence quenching on topological wire defects. An atomic force microscope tip...