Article
Nanoscience & Nanotechnology
Amin Farhadi, Theresa Bartschmid, Gilles R. Bourret
Summary: In this study, thermal dewetting was used to structure gold-based catalytic etching masks for metal-assisted chemical etching (MACE). The approach involved low-temperature dewetting of metal films to generate metal holey meshes with tunable morphologies. Combined with MACE, dewetting-assisted patterning provided a simple route to synthesize Si nanotubes, Si nanowalls, and Si nanowires with defined dimensions and optical properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Tandra Ghoshal, Michael A. Morris
Summary: In this study, a method for fabricating sub-20 nm MoS2 horizontal nanowire arrays using self-assembled block copolymers and in situ inclusion techniques was demonstrated. The fabricated nanowire arrays had long-range order and stability, making them highly promising for various applications.
Article
Chemistry, Multidisciplinary
Baolin Zhang, Lingkuan Meng, Zili Li
Summary: With the development of emerging semiconductor processes, the self-assembly and directed self-assembly of block copolymers have become promising candidates for advanced photolithography. By optimizing the coating and baking process, highly ordered assembly morphologies of two block copolymers were achieved in thin films without an additional topcoat material layer. Moreover, an optimal process for integrating the two block copolymers into the same topographic guiding pattern substrate was provided.
Article
Chemistry, Physical
Bijun Ni, Chao Fu, Shuang Pan, Luze He, Zhiqun Lin, Juan Peng
Summary: The study presents a method for creating highly interconnected organic-inorganic nanocomposites through two successive self-assembly processes. By tuning the quantum dot concentration, the structure of the nanocomposites can be conveniently tailored.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Leiming Guo, Martin Steinhart
Summary: In this study, we explored the potential of using block copolymer (BCP) polystyrene-block-poly (2-vinylpyridine) (PS-b-P2VP) stamps for the generation of topographic surface patterns. We demonstrated the fabrication of additive surface patterns using PS-b-P2VP breath figure (BF) arrays and the fabrication of subtractive surface patterns using PS-b-P2VP stamps penetrated by spongy mesopore systems. These findings provide new possibilities for controlling surface properties and achieving graphoepitaxy.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Hakon Rost, Benjamen P. Reed, Frode S. Strand, Joseph A. Durk, D. Andrew Evans, Antonija Grubisic-Cabo, Gary Wan, Mattia Cattelan, Mauricio J. Prieto, Daniel M. Gottlob, Liviu C. Tanase, Lucas de Souza Caldas, Thomas Schmidt, Anton Tadich, Bruce C. C. Cowie, Rajesh Kumar Chellappan, Justin W. Wells, Simon P. Cooil
Summary: The study presents a method to form graphene structures directly on a dielectric layer, with the ability to adjust the thickness of the dielectric layer through silicon intercalation, thus providing a new pathway for integrated graphene microelectronics with tunable thickness.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Maninderjeet Singh, Aman Agrawal, Wenjie Wu, Ali Masud, Edward Armijo, Damian Gonzalez, Shenghui Zhou, Tanguy Terlier, Chenhui Zhu, Joseph Strzalka, Krzysztof Matyjaszewski, Michael Bockstaller, Jack F. Douglas, Alamgir Karim
Summary: The template-free unidirectional alignment of lamellar block copolymers (l-BCPs) is important for sub-10 nm high-resolution patterning and hybrid multicomponent nanostructures. This study demonstrates a modified soft-shear-directed self-assembly approach for aligning pristine l-BCPs and l-BCPs with incorporated polymer-grafted nanoparticles (PGNPs), as well as the conversion of l-BCPs to aligned gold nanowires and hybrid line-dot nanostructures. The aligned BCPs and nanowires have potential use in nanopatterning applications, and the line-dot nanostructures could be useful in sensing biomolecules based on the plasmonic response of the nanowires.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Polymer Science
Mingjun Qiu, Weiwei Du, Shangyu Zhou, Pengzhe Cai, Yingwu Luo, Xiaoxue Wang, Rong Yang, Junjie Zhao
Summary: This review summarizes the recent progress in non-photolithographic patterning methods, including soft lithography, nanoimprint lithography, direct writing, self-assembly of block copolymers, area-selective vapor phase deposition, and instability-induced patterning. These methods have been applied in various applications such as chromic devices, polymer light-emitting diodes, sensors, transistors, protein and cellular engineering, and more. The challenges and future research directions of non-photolithographic patterning approaches are highlighted, focusing on resolution, reliability, and scalability.
PROGRESS IN POLYMER SCIENCE
(2023)
Article
Polymer Science
Erin Tsai, Hishara Keshani Gallage Dona, Xinjie Tong, Pu Du, Brian Novak, Rolf David, Steven W. Rick, Donghui Zhang, Revati Kumar
Summary: In this study, the internal structure and noncovalent interactions of polypeptoid micelles were investigated using a combination of molecular dynamics simulations and experimental data. The position of charged moieties was found to influence the shape of the micelles, offering the possibility for tailoring their shape. Additionally, micelles with triple-charged moieties exhibited stronger electrostatic repulsion and their shape was difficult to predict.
Editorial Material
Nanoscience & Nanotechnology
Kevin G. Yager
Summary: The self-assembly of a triblock bottlebrush polymer at one length scale determines the organization of the self-assembly at a smaller scale, creating a hierarchical unit cell.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Annaelle Demaude, Kitty Baert, David Petitjean, Juliette Zveny, Erik Goormaghtigh, Tom Hauffman, Michael J. Gordon, Francois Reniers
Summary: In this work, immobilization of unwanted filaments in dielectric barrier discharges (DBD) is achieved for one-step deposition of patterned coatings. By texturing one of the dielectric surfaces, chemical and topographical contrasts at sub-millimeter scale are obtained. The influence of filaments on the deposition process is investigated.
Article
Chemistry, Physical
Marco V. Nardi, Melanie Timpel, Laura Pasquardini, Tullio Toccoli, Marina Scarpa, Roberto Verucchi
Summary: The functionalization of inorganic surfaces by organic functional molecules is a viable and promising method for novel biosensing devices. This study presents a reliable surface functionalization route using 2,6-naphthalene dicarboxylic acid on silicon nitride surface, allowing for stable attachment of biomolecules. The successful functionalization and interface analysis pave the way for attaching bioreceptor molecules onto the silicon nitride surface.
Article
Chemistry, Multidisciplinary
Wanyue Ouyang, Simin Zhang, Xun Wang
Summary: A freestanding membrane with tunable pore size is prepared by co-assembly of block copolymers (BCPs) and subnanometer nanowires (SNWs), combining the function of BCPs and mechanical properties of SNWs. The composite membrane shows significantly improved tensile strength compared to BCPs due to the synergy of the components and hierarchical structure. The membranes exhibit precise size-selected effect in ultrafiltration and can distinct nanoparticles with a diameter difference as small as 5 nm, demonstrating promising applications in separation technology and other fields.
Review
Nanoscience & Nanotechnology
Qijin Huang, Yong Zhu
Summary: Metal nanowires, especially silver nanowires, have been recognized as promising candidate materials for flexible and stretchable electronics due to their high electrical conductivity and ability to maintain electrical conductivity under deformation. Precise patterning of metal nanowire networks is crucial for high-performance electronic devices and remains a critical challenge in the field.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Syed M. N. Hasan, Weicheng You, Arnob Ghosh, Sharif Md. Sadaf, Shamsul Arafin
Summary: This work presents the selective area epitaxy of GaN nanostructures grown on Ga-polar GaN/sapphire substrates by plasma-assisted molecular beam epitaxy. Three types of nanostructures, namely nanowires, nanofins, and nanorings, are demonstrated on GaN-on-sapphire templates, with investigation on the control of their morphology and orientation. This study advances the understanding of selective area epitaxy for defining complex III-nitride nanostructures, which are important in the fields of nanotechnology and nanoscience.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Abdunaser M. Ewlad-Ahmed, Michael Morris, Justin Holmes, David J. Belton, Siddharth V. Patwardhan, Lorraine T. Gibson
Summary: The study demonstrates that green nanosilicas show high efficiency in removing volatile organic compounds and can be customized in terms of physical properties and adsorption capacity. Their high efficiency is attributed to the broad pore size distribution, particularly the presence of meso- and micro-porosity.
Article
Chemistry, Multidisciplinary
Adria Garcia-Gil, Subhajit Biswas, Ahin Roy, Dzianis Saladukh, Sreyan Raha, Thomas Blon, Michele Conroy, Valeria Nicolosi, Achintya Singha, Lise-Marie Lacroix, Justin D. Holmes
Summary: In this study, we successfully fabricated a metastable allotrope of tetragonal germanium (ST12-Ge) in the form of nanowires. The nanowires were synthesized using a solvothermal-like single-pot method and a self-seeded vapour-liquid-solid mechanism. The ST12-Ge nanowires showed unique physical properties and had a significant impact on light emission intensity and bandgap directness.
Article
Nanoscience & Nanotechnology
Fionan Davitt, Kamil Rahme, Sreyan Raha, Shane Garvey, Manuel Roldan-Gutierrez, Achintya Singha, Shery L. Y. Chang, Subhajit Biswas, Justin D. Holmes
Summary: In this study, highly crystalline layered SnSe nanoribbons were grown using a simple solution-phase approach. The use of PVP as a templating agent allowed for selective passivation of certain facets, resulting in unique growth of nanoribbons along their b-axis with a defined zigzag edge state. The SnSe nanoribbons exhibited few layers, wide widths, and achievable lengths, with the ability to produce them in high quantities in a single batch experiment. The use of non-toxic PVP as a replacement for toxic amines in other forms of SnSe is an important advantage for sustainable and environmentally friendly applications. The heat transport properties of the SnSe nanoribbons, determined through power-dependent Raman spectroscopy, demonstrate their potential as thermoelectric materials.
Article
Chemistry, Physical
Adria Garcia, Subhajit Biswas, David McNulty, Ahin Roy, Sreyan Raha, Sigita Trabesinger, Valeria Nicolosi, Achintya Singha, Justin D. Holmes
Summary: Developing a simple, cheap, and scalable method for the fabrication of functional nanomaterials is crucial. In this study, a very simple one-pot solvothennal-like growth method for carbonaceous germanium (C-Ge) nanowires in a supercritical solvent is reported. These self-seeded nanowires have highly crystalline and thin structures. As an anode material for Li-ion batteries, the carbonaceous Ge nanowires demonstrate impressive electrochemical performance with high specific charge values and stable capacity retention.
ACS APPLIED ENERGY MATERIALS
(2022)
Correction
Physics, Applied
Sreyan Raha, Divya Srivastava, Subhajit Biswas, Adria Garcia-Gil, Antti J. Karttunen, Justin D. Holmes, Achintya Singha
APPLIED PHYSICS LETTERS
(2022)
Article
Biochemistry & Molecular Biology
Nadezda Prochukhan, Stephen A. O'Brien, Arantxa Davo-Quinonero, Anna Trubetskaya, Eoin Cotter, Andrew Selkirk, Ramsankar Senthamaraikannan, Manuel Ruether, David McCloskey, Michael A. Morris
Summary: A method for manufacturing standalone lignin membranes without additives is reported, using different organosolv lignin materials in a humid environment. The membranes can be used as templates for producing nickel oxide membranes and further etching to form black silicon. This method can be applied to various processes and adapted for large-scale manufacturing.
Article
Nanoscience & Nanotechnology
Aislan Esmeraldo Paiva, Jhonattan Frank Baez Vasquez, Andrew Selkirk, Nadezda Prochukhan, Fernanda G. L. Medeiros Borsagli, Michael Morris
Summary: A facile and versatile strategy was developed to produce highly ordered porous metal oxide structures using block copolymer lithography. The effects of various parameters on the ordering of the structures were analyzed, and the strategy can be applied to create different inorganic nanostructures for various applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Shane Garvey, Andrew Serino, Maria Barbara Maccioni, Justin D. Holmes, Michael Nolan, Nerissa Draeger, Emir Gurer, Brenda Long
Summary: This study reveals the key role of humidity in preventing germination oxidation and SAM degradation. The experimental results show that humidity can induce germination re-oxidation. In addition, atomic force microscopy data shows that humidity has little impact on the surface roughness of germination. By simulating experimental conditions and understanding atomic-level processes, the stability mechanism of thiol-SAM passivated germination in different configurations is revealed.
Article
Chemistry, Multidisciplinary
Adria Garcia-Gil, Subhajit Biswas, David McNulty, Ahin Roy, Kevin M. Ryan, Valeria Nicolosi, Justin D. Holmes
Summary: This study reports the fabrication of high aspect ratio super-thin Ge1-xSnx nanowires using a solvothermal-like growth method. The dimensions of the nanowires and the amount of Sn in the Ge lattice were found to be critical to achieving high electrochemical performance as an anode material for Li-ion batteries.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Rajasree Das, Liang Ye, Sumit Sukhbasi Lal, Hasan Ahmadian Baghbaderani, Ranajit Sai, Michael Hayes, Michael A. A. Morris, Paul McCloskey
Summary: FeSiB based soft magnetic flakes coated with optimally thick SiO2 were produced by mechanical ball milling and optimized sol-gel coating. The milling process reduced ribbon thickness to minimize eddy current loss, and a tiny fraction of the flakes were allowed to become nanocrystalline, enhancing saturation flux density and permeability without incurring additional losses. A stress-releasing post-annealing process further improved the magnetic properties without affecting the insulating SiO2 layer.
Article
Engineering, Environmental
Aislan Esmeraldo Paiva, Jhimli Paul Guin, Jhonattan Frank Baez Vasquez, K. Ravindranathan Thampi, James A. Sullivan, Fernanda G. L. Medeiros Borsagli, Michael A. Morris
Summary: Porous iron oxide structures were produced on glass substrates using block copolymer templating. XRD and XPS studies revealed the coexistence of FeIII/FeII. Vertically aligned PS cylinders with pore sizes of 35, 45 and 400 nm were obtained by varying the annealing time. The iron oxide-covered glass substrates showed efficient degradation of levofloxacin solution through a photo-Fenton process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Liang Ye, Rajasree Das, Guannan Wei, Sumit Sukhbasi Lal, Michael Morris, Hasan Ahmadian Baghbaderani, Ranajit Sai, Paul McCloskey
Summary: Melt-spun Fe-based ribbons are commonly used in transformers and inductors due to their high flux density and low coercivity. However, their high thickness results in significant eddy current losses at MHz frequencies. This study demonstrates an optimized ball milling process to produce high-yield flakes in the desired size range (2-4 μm) to suppress the eddy current losses. The findings provide an efficient approach to fabricate ultra-thin flakes for high-frequency applications.
Article
Materials Science, Multidisciplinary
Sajan Singh, Tandra Ghoshal, Nadezda Prochukhan, Alberto Alvarez Fernandez, Jhonattan Frank Baez Vasquez, Pravind Yadav, Sibu C. Padmanabhan, Michael A. Morris
Summary: In this study, we demonstrated the formation of oxide porous and nanodot structures from the same block copolymer (BCP) through the phase inversion of a BCP template. The effect of solvent annealing time on the ordering of the BCP was investigated. Metal ions were infiltrated into the BCP templates and oxidized to their oxides. The resulting structures were analyzed through various methods, confirming the complete elimination of the BCP template and the presence of metal oxides.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sreyan Raha, Subhajit Biswas, Jessica Doherty, Prasanna Kumar Mondal, Justin D. Holmes, Achintya Singha
Summary: Alloying group IV semiconductors is an effective method for engineering their electronic properties and lattice dynamics. By studying the Raman spectra of Ge1-xSnx alloy nanowires, we have discovered new modes associated with the optical phonon mode of Ge, which are assigned to the stretching of Ge-Ge bonds due to Sn-induced lattice relaxation and compression.
Article
Materials Science, Multidisciplinary
Caitlin McFeely, Matthew Snelgrove, Kyle Shiel, Gregory Hughes, Pravind Yadav, Ross Lundy, Michael A. Morris, Enda McGlynn, Robert O'Connor
Summary: Research on the fabrication of polymer brushes for Area Selective Deposition is crucial for understanding 'bottom up' lithographic techniques. In this study, we demonstrate that thin polystyrene brushes can effectively block atomic layer deposition processes, providing a potential route to area deactivation. We also found that the thickness of the polystyrene brushes has a significant impact on the blocking efficacy.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
