Article
Chemistry, Physical
Ting Hu, Zhi Xing, Lu Huang, Dengxue Li, Xiangchuan Meng, Xiaotian Hu, Yiwang Chen
Summary: To address the limitations of two-dimensional perovskites in photovoltaic applications, a strategy for developing high-quality patterned 2D perovskites was proposed. The patterned films showed improved light absorption and interfacial contact, leading to enhanced efficiencies and stability of the solar cells.
CHEMISTRY OF MATERIALS
(2022)
Article
Engineering, Mechanical
Jingxuan Cai, Guohua Li, Jianhua Zhou, Wen-Di Li
Summary: A hybrid model has been developed to study the dynamic filling process of the resist and investigate the subsequent capillary force induced structural deformation of the imprint mold during nanoimprint lithography (NIL). The dynamic behavior of resist filling was investigated using a hydrodynamic model, while the deformation of mold structures was modeled using beam bending mechanics. The theoretical analysis proposed a general parameter of critical aspect ratio for the design of NIL mold, especially for high aspect ratio and ultra-high resolution molds.
EXTREME MECHANICS LETTERS
(2023)
Article
Chemistry, Physical
Abhaysinh Gaikwad, Salil Desai
Summary: Understanding the deformation behavior during nanoimprint lithography is crucial for high resolution patterning. Molecular dynamics modeling was used to investigate how different mold profiles affect von Mises stress, lattice dislocations, and material deformation. Higher stress was observed for spherical molds compared to rectangular and cylindrical molds. During mold penetration stage, stress increased for all mold geometries but reduced during relaxation and mold retrieval stages. The findings can aid in mold design for various applications.
Article
Engineering, Biomedical
Mahya Ganjian, Khashayar Modaresifar, Dionysios Rompolas, Lidy E. E. Fratila-Apachitei, Amir A. A. Zadpoor
Summary: Developing a high-throughput nanopatterning technique with precise control over feature dimensions is crucial for studying cell-nanopattern interactions. This study presents a process that fulfills these criteria by using electron-beam lithography to fabricate controlled arrays of submicron pillars and developing etching procedures to create the desired height. The study demonstrates the significance of the fabricated pillars in inducing osteogenic differentiation and utilizes replication techniques to pattern bio-instructive surfaces. Overall, the method enables the precise fabrication of submicron and nanopatterns for systematic cell studies.
ACTA BIOMATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Christine Thanner, Martin Eibelhuber
Summary: The UV Nanoimprint Lithography is efficient in producing resist layers with features ranging from micrometers to nanometers. Understanding material properties, pattern size, and shape is crucial for optimizing processes for reliable manufacturing. Comparing results for different pattern geometries can provide a helpful overview of relevant process parameters.
Article
Multidisciplinary Sciences
Woo Young Kim, Bo Wook Seo, Sang Hoon Lee, Tae Gyung Lee, Sin Kwon, Won Seok Chang, Sang-Hoon Nam, Nicholas X. Fang, Seok Kim, Young Tae Cho
Summary: A challenge in making a flexible mold stamp using roll-to-roll nanoimprint lithography is to increase area while minimizing perceptible seams. A method that enables the fabrication of scalable, quasi-seamless functional surfaces without the use of alignment marks is proposed. This method is capable of fabricating scalable functional surfaces and imprint molds with quasi-seamless and alignment mark-free patterning.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Fionnuala McGrath, Jing Qian, Kelsey Gwynne, Cindy Kumah, Dermot Daly, Calin Hrelescu, Xia Zhang, Deirdre M. O'Carroll, A. Louise Bradley
Summary: A facile method for fabricating silver gratings using silver nanoparticle ink and nanoimprint lithography is investigated, with comparisons made to thermally evaporated silver on nanoimprinted PMMA. The study found that the use of a PMMA layer adversely affects the structural, optical, and electrical properties of the silver nanoparticle planar surfaces and gratings.
APPLIED SURFACE SCIENCE
(2021)
Article
Polymer Science
Sruthi Venugopal Oopath, Avinash Baji, Mojtaba Abtahi
Summary: This study aims to produce a hydrophobic polymer film by mimicking the hierarchical micro/nanostructures found on the surface of rose petals. The presence of these structures on the polyurethane acrylate (PUA) film influenced its wettability behavior, leading to a highly hydrophobic surface. The film also displayed the water pinning effect, similar to natural materials.
Review
Nanoscience & Nanotechnology
Youngseop Lee, Hao F. Zhang, Cheng Sun
Summary: Photoacoustic imaging enables noninvasive volumetric imaging of biological tissues by capturing the endogenous optical absorption contrast. Polymer micro-ring resonators (MRRs) in the form of integrated photonic circuits (IPC) offer a promising solution for ultrasound detection in PA imaging. The continued engineering innovation has further expanded the applications of MRRs, including multi-modality optical microscope, PA endoscope, and photoacoustic computed tomography (PACT).
Article
Engineering, Electrical & Electronic
Mingjie Li, Yulong Chen, Wenxin Luo, Xing Cheng
Summary: In this work, adhesion and friction stresses were measured to reduce the total demolding force in nanoimprint lithography. The introduction of a conformal Al2O3 layer and an anti-adhesion layer helped to lower both the adhesion and friction stresses, leading to a decreased defect rate in UV-NIL processes.
MICROELECTRONIC ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Geoffrey Avit, Yoann Robin, Yaqiang Liao, Hu Nan, Markus Pristovsek, Hiroshi Amano
Summary: GaN nanorods with axial InGaN/GaN MQWs insertions were synthesized using a cost-effective nanoimprint-lithography process. By controlling the diameter, luminescence with a blueshift up to 0.26 eV was achieved without significant degradation of the recombination rate. This process enables multiple single-color emissions from a single uniform InGaN/GaN MQWs layer, addressing color mixing issues in InGaN-based nanorods LED devices.
SCIENTIFIC REPORTS
(2021)
Article
Mechanics
Aryan Mehboudi, Shrawan Singhal, S. V. Sreenivasan
Summary: This paper investigates the squeeze flow of a droplet confined between two plates with a step. The study reveals that when the step size is comparable to the gap between plates, the squeeze flow characteristics become distinct across the step, and larger squeezing forces enhance mass transfer. The results provide valuable insights for nanoimprint lithography.
Article
Multidisciplinary Sciences
Dongjing Li, Aixia Wu, Qing Wan, Zeping Li
Summary: This strategy demonstrates a controllable method to fabricate polymeric nanowires with high throughput and low cost using thermal nanoimprint lithography (NIL) technique and self-assembled anodic aluminum oxide (AAO) template. The length of polymeric nanowires can be adjusted by the duration of thermal NIL, and the fill mechanism of thermoplastic intermediate polymer stamp (IPS) into AAO nanopores is essential for the preparation of SERS-active substrates. The approach shows potential for expanding the use of thermal NIL technique and AAO template for fabricating various nanomaterials, especially flexible and transparent polymer-based nanomaterials.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Yang Xu, Julien Scheibert, Nikolaj Gadegaard, Daniel M. Mulvihill
Summary: This study proposes a statistical model based on experimentally observed phenomena and contact mechanics laws, which successfully reproduces macroscopic responses observed in friction experiments and demonstrates the influence of microscale interface properties on static friction and contact area evolution.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Chemistry, Applied
Armen Tchobanian, Frederik Ceyssens, Mar Condor Salgado, Hans Van Oosterwyck, Pedro Fardim
Summary: The study synthesised dextran palmitates with a multipurpose functionality to modulate surface energy through surface chemistry and to be patterned, and produced films by spin coating and patterned by thermal nanoimprint lithography. These moderately hydrophobic films performed well in cell culture and guided multicellular arrangements on specific topographies after patterning.
CARBOHYDRATE POLYMERS
(2021)