Ultrathin organic films: Molecular Architectures for advanced optical, electronic and bio‐related systems

Fuchs, Harald; Ohst, Holger; Praß, Werner

doi:10.1002/adma.19910030103

Cited by 118 publications

(40 citation statements)

References 73 publications

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“…These films represent a novel class of materials with potential application in advanced optical and electronic systems [4]. On the other hand there exist only a few surface techniques capable to probe the properties of molecular monolayers.…”

Section: Introductionmentioning

confidence: 99%

STM investigations of PTCDA and PTCDI on graphite and MoS2. A systematic study of epitaxy and STM image contrast

Ludwig

Gompf

Petersen

et al. 1994

Z. Physik B - Condensed Matter

196

147

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Abstract.Monolayers of the organic molecules perylene-3,4,9,10-tetra-carboxylic-dianhydride (PTCDA) and -diimide (PTCDI) on graphite and MoS 2 have been imaged with scanning tunneling microscopy. The epitaxial growth of the two molecules is determined by the intermolecular interaction but nearly independent of the substrate. On both substrates the STM image contrast in the submolecularly resolved images is dominated by the aromatic perylene system whereas the polar oxygen and nitrogen groups are invisible. The correlation of the observed inner structure of the molecules to their molecular structure allows us to compare our results with theoretical considerations.

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Section: Introductionmentioning

confidence: 99%

STM investigations of PTCDA and PTCDI on graphite and MoS2. A systematic study of epitaxy and STM image contrast

Ludwig

Gompf

Petersen

et al. 1994

Z. Physik B - Condensed Matter

196

147

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“…In each polyelectrolyte adsorption step, overcompensation of charge [2] enables cyclic repetition to thicken films, which are readily deposited via spincoating [3,4], spraycoating [5,6], or dipcoating [1,2] processes. PEMLs so produced have already been applied to areas of metal enhanced fluorescence [7], photovoltaic sensitization [8], light-emitting diodes [9], permselective membranes [3], heterogeneous catalysts [10,11], sensors [12,13], microcapsules [3,14], and pH controlled release delivery systems [15,16]. A valuable attribute of LbL deposition is control over the PEML physicochemical properties by variation of factors such as pH [15,16], the presence of salts [2,17] (as well as ionic strength [18]), and temperature [19] to tune layer thickness [20], degree of polyelectrolyte layer interpenetration [2], surface roughness (RMS) [21], film wettability [13], and the formation/size of pores [14].…”

Section: Introductionmentioning

confidence: 99%

Optical interference effect corrections for absorbance spectra of layer-by-layer thin films bearing covalently bound dye

Saydjari

Long

Dressick

et al. 2014

Chemical Physics Letters

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“…Examples include wrapping a gift in daily lives, or wrapping an electrode with a graphene sheet to accommodate volume expansion upon battery cycling . Wrapping has also been developed as a functionalization tool to endow 3D objects with desired properties, such as hydrophobicity, optical properties, or conductive properties . Most recently, the range of wrapped content has expanded to liquids, with the encapsulant being either solid elastic films or solid‐like jammed films of functional particles .…”

Section: Introductionmentioning

confidence: 99%

A Cast Net Thrown onto an Interface: Wrapping 3D Objects with an Interfacially Jammed Amphiphilic Sheet

Cui

Gao

Bowland

et al. 2020

Adv Materials Inter

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with the encapsulant being either solid elastic films [12][13][14][15][16] or solid-like jammed films of functional particles. [17][18][19][20][21] These films are rigid enough to stabilize nonequilibrium morphologies of the wrapped liquid, thus breaking the limit of equilibrium morphologies and further creating new shapes of wrapped, encapsulated fluids with inimitable functionalities.For traditional liquid-phase technologies, a liquid-like layer of surfactant or particles is usually used for wrapping and stabilizing liquid droplets. [22][23][24] Recent studies show that sufficiently thin elastic sheets offer a novel path to spontaneously wrap liquid droplets using capillary forces, where the elastic energy of curving sheets is balanced by the reduction of interfacial energy. [15,16,25,26] Although negligible at macroscopic scales, capillary forces become dominant and are able to bend the elastic sheets when the bending rigidity of elastic sheets is vanishingly small. [12,15,25] The robust elastic sheets allow the liquid drops to be trapped in nonequilibrium 3D shapes via a process that is usually referred to as capillary origami. [12,16,26] In previous wrapping studies, the final encapsulated 3D geometry was almost solely determined by the initial geometry of the flat thin elastic sheets, which made the process complicated and lacked versatility. The elastic sheets in previous reports were often conventional polymer thin films whose interfacial activities were too weak to manipulate the interfacial tension and participate in morphology evolution. [12,15,16] A large-scale elastic sheet [27] with a significant interfacial activity is desired to manipulate the interface that can adapt to various nonequilibrium shapes by external influence-a stimulant for evolved morphologies at the interface.Here, we report in situ formation of a large-scale surfactant sheet with strong interfacial activities by interfacial jamming of poorly soluble amphiphilic lignin macromolecules in particulate form at an oil/water interface. The amphiphilic nature of the surfactant sheet enables wrapping of either water or oil droplets, while its rigidity allows it to hold the liquid phases in various nonequilibrium morphologies. The surfactant sheet is physically networked by reversible hydrogen bonding and π-π interaction, which endows it with transforming and self-healing ability. The strong interfacial activity of the surfactant sheet results in an interfacial instability, which drives evolution of interfacial morphology and novel wrapped microstructures.Wrapping a 3D object with a 2D sheet is not uncommon, but the wrapping behavior becomes complex and interesting when the sheet is bestowed with strong interfacial activities. Amphiphilic lignin macromolecules, isolated from biomass, form a scalable thin surfactant sheet at an oil/water interface through the interfacial jamming process. The process marks three distinct stages of interfacial behavior: a) diffusive assembly, b) viscous assembly with retarded mobility, and c) flexible yet irre...

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Ultrathin organic films: Molecular Architectures for advanced optical, electronic and bio‐related systems

Cited by 118 publications

References 73 publications

STM investigations of PTCDA and PTCDI on graphite and MoS2. A systematic study of epitaxy and STM image contrast

STM investigations of PTCDA and PTCDI on graphite and MoS2. A systematic study of epitaxy and STM image contrast

Optical interference effect corrections for absorbance spectra of layer-by-layer thin films bearing covalently bound dye

A Cast Net Thrown onto an Interface: Wrapping 3D Objects with an Interfacially Jammed Amphiphilic Sheet

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