Three different pi-conjugated oligomers (a blue-emitting oligofluorene, a green-emitting oligo(phenylene vinylene), and red-emitting perylene bisimide) have been functionalized with self-complementary quadruple hydrogen bonding ureidopyrimidinone (UPy) units at both ends. The molecules self-assemble in solution the bulk, forming supramolecular polymers. When mixed together solution, random noncovalent copolymers are formed that contain all three types of chromophores, resulting energy...

Well-defined high resolution structures with excellent electrical conductivities are key components of almost every electronic device. Producing these by printing metal based conductive inks on polymer foils represents an important step forward towards the manufacturing plastic products industrial scale. The development fast, efficient and inexpensive post-deposition sintering technologies for materials is processing to make this approach commercially viable. This review discusses advances...

A combination of photonic and microwave flash exposure is used to sinter inkjet printed silver nanoparticles. This approach leads conductive features on polymer substrates in short times that are compatible with roll-to-roll production. The sequential process sintering the as-printed revealed a final conductivity 40% bulk silver, less than 15 seconds. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...

This paper describes the gelation of highly concentrated graphene/polymer dispersions triggered by mild heating. The gel formation is only dependent on concentration graphene with 3.25 mg mL −1 as minimum value for network formation. then utilized preparation colloidally stable and (52 ) pastes that demonstrate excellent performance in screen printing down to lines 40 μm width. Printed patterns dried at 100 °C 5 min exhibit sheet resistances 30 Ω  25 thickness, thus, removing need long‐time...

Abstract Fluorene‐based π‐conjugated polymers and oligomers combine several advantageous properties that make them well‐suited candidates for applications in organic optoelectronic devices chemical sensors. This review highlights strategies to synthesize these materials tune their absorption emission colors. Furthermore, methods control supramolecular organization will be discussed. In many cases, a delicate interplay between the structure processing conditions are found, resulting high...

The production of electronic devices using solution based (“wet”) deposition technologies has some decisive technical and commercial advantages compared to competing approaches like vacuum (“dry”) manufacturing. Particularly, the potential scale up processes large areas high volumes by introducing continuous roll‐to‐roll (R2R) methods on flexible substrates been topic intense studies from both applied research institutes industry already for years. Decisive steps forward have achieved during...

Abstract Internationally, the environmental damage caused by improper disposal of approximately 100 Mt plastic waste per annum is growing concern. Attempts to address this issue have generated many hundreds scientific studies announcing discovery novel plastic-degrading microorganisms and their respective enzymes. On closer inspection, however, evidence remains sparse for microbial degradation most polymers produced globally. We systematically surveyed international literature confirm how...

Microplastics and their associated plastic additives are contaminants of emerging environmental concern. The extent rate additive leaching affects the behaviour fate these contaminants, therefore risk they present to organisms. However, most studies examining from microplastics use methods that not environmentally relevant. We evaluated a range common plastics using an relevant dynamic method with non-intentionally added substances quantified by liquid chromatography-mass spectrometry. was...

Reaction of RuHCl(PPh(3))(2)(diamine) (1a, diamine = (R,R)-1,2-diaminocyclohexane, (R,R)-dach; 1b, ethylenediamine, en) with KO(t)Bu in benzene quickly generates solutions the amido-amine complexes RuH(PPh(3))(2)(NHC(6)H(10)NH(2)), (2a'), and RuH(PPh(3))(2)(NHCH(2)CH(2)NH(2)), (2b'), respectively. These react dihydrogen to first produce trans-dihydrides (OC-6-22)-Ru(H)(2)(PPh(3))(2)(diamine) (t,c-3a, t,c-3b). Cold (-20 degrees C) containing trans-dihydride t,c-3a acetophenone under Ar give...

A set of fluorene oligomers has been synthesized by stepwise palladium-catalyzed (Suzuki) couplings monomers. Ureidopyrimidinones (UPy), functional groups that can dimerize via quadruple hydrogen bonds, were attached to both ends the oligofluorenes. The resulting bis-UPy-terminated self-assemble into supramolecular chain polymers. For comparison, oligofluorenes same oligomer lengths but without terminal hydrogen-bonding synthesized. Chains hydrogen-bonded fluorenes be simply endcapped a...

Five fluorene-based co-oligomers have been prepared to study their self-assembly in a wide range of concentrations, from dilute solutions the solid state. Subtle changes chemical structures, introduced tune emission colours over entire visible range, induce strong differences aggregation behaviour. Only two fluorescent co-oligomer derivatives self-assemble form soluble fibrils which organogels emerge at higher concentrations. In contrast, other compounds precipitates. Mixed systems exhibit...

Interdependence between ink, substrate and sintering method on inkjet printed devices.

The inkjet printing of graphene is a cost-effective, and versatile deposition technique for both transparent non-transparent conductive films. Printing on paper aimed at low-end, high-volume applications, i.e., in electromagnetic shielding, photovoltaics or, e.g., as replacement the metal antennas radio-frequency identification devices, thereby improving their recyclability biocompatibility. Here, we present comparison two inks, one prepared by solubilization expanded graphite presence...

Chiral conjugated polymer is used to construct a photovoltaic cell whose response depends on the circular polarization of incoming light. The selectivity for left and right polarized light as function thickness layer accounted by modeling optical properties all layers inside device. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note: publisher...

Bolaamphiphilic fluorene-based oligomers self-assemble in water to form fluorescent nanoparticles with tuneable emission colours covering the entire visible range, even including white.

To develop fluorescent organic nanoparticles with tailored properties for imaging and sensing, full control over the size, fluorescence, stability, dynamics, supramolecular organization of these particles is crucial. We have designed, synthesized, fully characterized 12 nonionic fluorene co-oligomers that formed self-assembled in water. In series molecules, ratio hydrophilic ethylene glycol hydrophobic alkyl side chains was systematically altered to investigate its role on above-mentioned...

An efficient strategy for the up-scaling of processing technology inkjet printing silver nanoparticle inks towards industrially relevant manufacturing volumes is described. This has been demonstrated by roll-to-roll production fine conductive patterns on polymer foils. Starting with small-scale benchmarking to identify most suitable ink–substrate combination from a range commercial products, conditions and sintering were continuously optimized during three consecutive stages. During each...

Despite the great promise of printed flexible electronics from 2D crystals, and especially graphene, few scalable applications have been reported so far that can be termed roll‐to‐roll compatible. Here we combine screen graphene with photonic annealing to realize radio‐frequency identification devices a reading range up 4 meters. Most notably our approach leads fatigue resistant showing less than 1% deterioration electrical properties after 1000 bending cycles. The resistance demonstrated on...

Abstract

This paper describes a combination of photonic annealing and compression rolling to improve the conductive properties printed binder‐based graphene inks. High‐density light pulses result in temperatures up 500 °C that along with decrease resistivity lead layer expansion. The structural integrity layers is restored using resulting smooth, dense, highly films. exhibit sheet resistance less than 1.4 Ω □ −1 normalized 25 µm thickness. proposed approach can potentially be used roll‐to‐roll manner...

A chiral fluorene homopolymer (PF) and two new alternating polyfluorenes, poly(fluorene-alt-benzothiadiazole) (PFBT) poly(fluorene-alt-dithienylbenzothiadiazole) (PFDTBT), have been synthesized by palladium-catalyzed Suzuki polycondensations. In these polymers, chirality was introduced attaching (S)-3,7-dimethyloctyl substituents to the 9-positions of monomers. Upon thermal annealing, PF PFBT undergo an irreversible phase transition a liquid crystalline state that upon cooling room...