Confinement-induced nanocrystal alignment of conjugated polymer by the soft-stamped nanoimprint lithography

Li, Xiaohui; Yu, Jicheng; Lu, Naiyan; Zhang, Weidong; Weng, Yuyan; Gu, Zhen

doi:10.1088/1674-1056/24/10/104215

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Nano-to mesoscale confinement effects have been used extensively in the nanoimprint lithography literature for crystallization of functional polymers from the melt phase [85][86][87][88] and, recently, from solution [89][90][91]. Wei et al [90] developed a technique known as 'solvent-assisted roomtemperature nanoimprint lithography' to print the donoracceptor polymer poly[2,5-bis(2-octyldodecyl) pyrrolo-[3,4c]pyrrole-1,4(2H,5H)-dione-alt-2,2′:5′,2″:5″,2″′-quaterthiophene] (PDQT) in well-aligned nanostrips.…”

Section: Lateral and Volume Confinement Effectsmentioning

confidence: 99%

Multiscale assembly of solution-processed organic electronics: the critical roles of confinement, fluid flow, and interfaces

Patel

Diao

2017

Nanotechnology

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Organic semiconducting small molecules and polymers provide a rich phase space for investigating the fundamentals of molecular and hierarchical assembly. Stemming from weak intermolecular interactions, their assembly sensitively depends on processing conditions, which in turn drastically modulate their electronic properties. Much work has gone into molecular design strategies that maximize intermolecular interactions and encourage close packing. Less understood, however, is the non-equilibrium assembly that occurs during the fabrication process (especially solution coating and printing) which is critical to determining thin film morphology across length scales. This encompasses polymorphism and molecular packing at molecular scale, assembly of π-bonding aggregates at the tens of nanometers scale, and the formation of domains at the micron-millimeter device scale. Here, we discuss three phenomena ubiquitous in solution processing of organic electronic thin films: the confinement effect, fluid flows, and interfacial assembly and the role they play in directing assembly. This review focuses on the mechanistic understanding of how assembly outcomes couple closely to the solution processing environment, supported by salient examples from the recent literature.

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Section: Lateral and Volume Confinement Effectsmentioning

confidence: 99%

Multiscale assembly of solution-processed organic electronics: the critical roles of confinement, fluid flow, and interfaces

Patel

Diao

2017

Nanotechnology

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“…[18][19][20] As a rod-like conjugated polymer, the PFO molecular chain arrangement can be affected by graphoepitaxial alignment and nanoconnement in the cavities of the nanoimprinting templates. 13,21,22 By efficiently tuning the PFO molecular chain alignment degree in the active layer, polarizability improvement can be realized.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of light-emitting properties by simultaneously patterning and controlling molecular alignment in polyfluorene thin films

Shen

Gao

et al. 2017

RSC Adv.

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Surface plasmon resonance coupling effect of micro-patterned gold film

Lu¹,

Xue-Jian²,

Wan³

et al. 2016

Acta Phys. Sin.

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Surface-enhanced Raman scattering has a high sensitivity in the detections of complex biological systems, and it has a lot of potential applications in food inspection, biological imaging and biosensors in biochemistry, etc. Here, we investigate the surface Raman enhancements on gold films of different morphologies and further simulate the enhancements by using the finite difference time domain. To prepare the substrates with different morphologies, polymethyl methacrylate (PMMA) is spin coated 2000 rpm in one minute on a silicon wafer, followed by annealing at 180℃ for 5 min. Then, PMMA is etched by a 20 kV electron beam lithography. With the PMMA used as a soft imprint template, polydimethylsiloxane (PDMS) is dropped on the template then removed gently from the template after drying at 60℃ for 4 h. Finally, a gold thin film is prepared on the PDMS by magnetron sputtering with a current of 10 mA for 15 min. We design two kinds of morphologies:a four-way grid and a square morphology. The dimension of the four-way grids is 40 m and the grid width is 4 upm. The dimension of the square is also 4 upm. The cystine and melamine solutions with concentrations of 50, 100, 200 and 400 ppm are deposited on the surfaces of the gold thin film, respectively. The Raman spectra of cystine and melamine solutions are measured on the substrates with four-way grids and dot arrays. The Raman spectra of cystine on two kinds of substrates show no obvious difference. Due to the relatively small enhancement of melamine, the Raman peaks of melamine solutions of concentrations 50 and 100 ppm on the substrate of square morphologies are not easy to detect. On the contrary, all of the Raman spectra of melamine on the substrate of four-way grid morphologies are clear. The result indicates that the substrate with four-way grids has better sensitivity and enhancement performance. To verify the influence of the morphologies of the substrates on surface Raman enhancement and understand the mechanism of the enhancement, we simulate the scattering spectra and field distributions of different morphologies on gold thin films by using the finite difference time domain method. It is indicated that more complex the structure, the more obvious the enhanced Raman spectra will be. The calculations show that the enhancements of four-way grid morphologies are better than those of square morphologies. The predicted results of the surface enhanced Raman scattering are consistent with the measurements. These results will provide guidance and theoretical basis for further applications of surface enhanced.

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Confinement-induced nanocrystal alignment of conjugated polymer by the soft-stamped nanoimprint lithography

Abstract: Confinement-induced nanocrystal alignment of conjugated polymer by the soft-stamped nanoimprint lithography * Li Xiao-Hui(李晓慧) a) , Yu Ji-Cheng(俞计成) b) , Lu Nai-Yan(陆乃彦) a) , Zhang Wei-Dong(张卫东) a) , Weng Yu-Yan(翁雨燕) a) † , and Gu Zhen(顾臻) b) ‡ a)

Cited by 3 publications

References 21 publications

Multiscale assembly of solution-processed organic electronics: the critical roles of confinement, fluid flow, and interfaces

Multiscale assembly of solution-processed organic electronics: the critical roles of confinement, fluid flow, and interfaces

Enhancement of light-emitting properties by simultaneously patterning and controlling molecular alignment in polyfluorene thin films

Surface plasmon resonance coupling effect of micro-patterned gold film

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Confinement-induced nanocrystal alignment of conjugated polymer by the soft-stamped nanoimprint lithography

Abstract: Confinement-induced nanocrystal alignment of conjugated polymer by the soft-stamped nanoimprint lithography * Li Xiao-Hui(李晓慧) a) , Yu Ji-Cheng(俞计成) b) , Lu Nai-Yan(陆乃彦) a) , Zhang Wei-Dong(张卫东) a) , Weng Yu-Yan(翁雨燕) a) † , and Gu Zhen(顾 臻) b) ‡ a)

Cited by 3 publications

References 21 publications

Multiscale assembly of solution-processed organic electronics: the critical roles of confinement, fluid flow, and interfaces

Multiscale assembly of solution-processed organic electronics: the critical roles of confinement, fluid flow, and interfaces

Enhancement of light-emitting properties by simultaneously patterning and controlling molecular alignment in polyfluorene thin films

Surface plasmon resonance coupling effect of micro-patterned gold film

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Abstract: Confinement-induced nanocrystal alignment of conjugated polymer by the soft-stamped nanoimprint lithography * Li Xiao-Hui(李晓慧) a) , Yu Ji-Cheng(俞计成) b) , Lu Nai-Yan(陆乃彦) a) , Zhang Wei-Dong(张卫东) a) , Weng Yu-Yan(翁雨燕) a) † , and Gu Zhen(顾臻) b) ‡ a)