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Search Publications by: Jeffrey Fagan (Fed)

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Displaying 1 - 25 of 96

The Impact of Carbon Nanotube Length and Diameter on their Global Alignment by Dead-End Filtration

December 22, 2022
Author(s)
Christopher Rust, Pavel Shapturenka, Manuel Spari, Andreas Bacher, Qihao Jin, Han Li, Markus Guttmann, Ming Zheng, Tehseen Adel, Angela R. Hight Walker, Jeffrey Fagan, Benjamin Flavel
Dead-end filtration on polyvinylpyrrolidone-coated polycarbonate track-etched membranes has proven to be an effective method to prepare macroscopically (3.8 cm²) aligned thin films from solution-based single-wall carbon nanotubes (SWCNTs). However, to make

Van der Waals SWCNT@BN Heterostructures Synthesized from Solution-Processed Chirality-Pure Single-Wall Carbon Nanotubes

November 10, 2022
Author(s)
Chiyu Zhang, Jacob Fortner, Peng Wang, Jeffrey Fagan, Shuhui Wang, Min Liu, Shigeo Maruyama, YuHuang Wang
Single-wall carbon nanotubes in boron nitride (SWCNT@BN) are one-dimensional van der Waals heterostructures that exhibit intriguing physical and chemical properties. As with their carbon nanotube counterparts, these heterostructures can form different

Efficient inner-to-outer wall energy transfer in highly pure double-wall carbon nanotubes revealed by detailed spectroscopy

September 28, 2022
Author(s)
Maksiem Erkens, Dmitry Levshov, Wim Wenseleers, Han Li, Benjamin Flavel, Jeffrey Fagan, Valentin Popov, Marina Avramenko, salome forel, Emmanuel FLAHAUT, Sofie Cambre
The coaxial stacking of two SWCNTs into a double-wall carbon nanotube (DWCNT), forming a so-called one-dimensional van der Waals structure, leads to synergetic effects that dramatically affect the optical and electronic properties of both layers. In this

Versailles Project on Advanced Materials and Standards (VAMAS) Interlaboratory Study on Measuring the Number Concentration of colloidal gold nanoparticles

March 9, 2022
Author(s)
Caterina Minelli, Karen E. Murphy, Monique Johnson, Antonio Montoro Bustos, Jeffrey Fagan, Ingo Strenge
We describe the outcome of an international interlaboratory study of the measurement of particle number concentration of colloidal nanoparticles, project 10 of the technical working area 34, "Nanoparticle Populations" of the Versailles Project on Advanced

Computational Design of Helical Peptide Bundle Variants Spanning a Wide Range of Charge States

March 1, 2022
Author(s)
Jeffrey Fagan, Nairiti Sinha, rui gui, Darrin Pochan, Grethe Vestergaard Jensen, Jeffery Saven, matthew Langenstein, Rajkumar Misra, Christopher Kloxin, yan tang
Peptides can be computationally designed and engineered to achieve various functionalities and structures. Herein computational design was used to identify a set of 17 peptides having a wide range of putative charge states but the same tetrameric coiled

Dependence of Single-Wall Carbon Nanotubes Alignment on the Filter Membrane Interface in Slow Vacuum Filtration

January 22, 2022
Author(s)
Jeffrey Fagan, Angela R. Hight Walker, Adam Biacchi, Andrei Kolmakov, Zia Macdermid, William D. Rice, Joshua Walker, Thomas Searles
The recent development of slow vacuum filtration (SVF) technology has shown great promise for reproducibly producing high-quality, large-area aligned films of single-wall carbon nanotubes (SWCNTs) from solution-based nanotube dispersions. In contrast to

Colloid-Like Solution Behavior of Computationally Designed Coiled Coil Bundlemers

January 15, 2022
Author(s)
Nairiti J. Sinha, Rui Guo, Rajkumar Misra, Jeffrey Fagan, Antonio Faraone, Christopher J. Kloxin, Jeffery G. Saven, Grethe V. Jensen, Darrin J. Pochan
The use of colloidal theory for describing protein-protein interactions is a topic of ongoing debate in the biophysical community. This contention stems from the unavailability of synthetic protein-like model particles that are amenable to systematic

Polyvinyl Acetate-Based Polymer Host for Optical and Far-Infrared Spectroscopy of Individualized Nanoparticles

January 15, 2021
Author(s)
Jeffrey Fagan, Henry Wladkowski, Julian Duarte, Shashank R. Nandyala, Joshua Walker, Subash Kattel, Jeffrey Blackburn, Jon Pikal, William D. Rice
Preparation techniques for producing films of individualized, solution dispersed nanoparticles (NPs) for optical spectroscopy are often technically challenging and tailored for a specific NP system. In this work, we present a rapid, easy, and economical

Selective Filling of n-Hexane in a Tight Nanopore

January 12, 2021
Author(s)
Jeffrey Fagan, Haoran Qu, Archith Rayabharam, Narayana Aluru, Xiaojian Wu, Peng Wang, Yunfeng Li, YuHuang Wang
Molecular sieving may occur when two similarly sized molecules compete for a nanopore. This size-selectivity generally favors the adsorption of molecules with smaller kinetic diameter into the pore while excluding larger ones. In nearly all known examples

Brightly Luminescent CsPbBr3 Nanocrystals through Ultracentrifugation

July 30, 2020
Author(s)
Jeffrey Fagan, Erik K. Hobbie, Aaron Forde, Richard D. Schaller, salim thomas, samuel brown, Matthew B. Kurtti, dmitri kilin
Colloidal lead-halide-perovskite nanocrystals (NCs) offer broad color tunability with bright photoluminescence (PL), fast lifetime, and narrow spectral linewidth. Because emission is tuned primarily through chemical composition, quantum confinement and

DNA-directed nanofabrication of high-performance carbon nanotube field-effect transistors

May 22, 2020
Author(s)
Ming Zheng, Jeffrey A. Fagan, Jason K. Streit, Mengyu Zhao, Yahong Chen, Kexin Wang, Zhi Zhu, Wei Sun
Scaling the channel pitch of field-effect transistors (FETs) is one prerequisite towards future ultra-scaled technology nodes. While lithography has been the foundational tool during the scaling of bulk materials, bio- fabrication is promising for

Precise pitch-scaling of ultra-scaled carbon nanotube arrays within 3D DNA nano-trenches

May 22, 2020
Author(s)
Jason K. Streit, Jeffrey Fagan, Ming Zheng, Wei Sun, Peng Yin, Jie Shen, Zhao Zhao, Hareem Maune
Precise assembly of carbon nanotubes (CNTs) into densely-aligned uniformly parallel arrays has been the missing link towards the emerging ultra-scaled post-Si technology nodes specified in the International Technology Roadmap for Semiconductors (ITRS)

Separation of Specific Single Enantiomer Single-Wall Carbon Nanotubes in the Large Diameter Regime

November 19, 2019
Author(s)
Jeffrey A. Fagan, Ming Zheng, Sofie Cambre, Wim Wenseleers, Benjamin Flavel, Han Li, Stephanie Reich, Georgy Gordeev, Oisin Garrity, Naga Peyyety, Ralph Krupke, Pranauv Selvasundaram
Enantiomer level isolation of single-wall carbon nanotubes (SWCNTs) in high concentration and purity for nanotubes greater than 1.1 nm in diameter is demonstrated for the first time using a twostage aqueous two-phase extraction (ATPE) technique. In total 5

Global alignment of solution-based single-wall carbon nanotube films via machine-vision controlled filtration

September 11, 2019
Author(s)
Jeffrey A. Fagan, Angela R. Hight Walker, Adam J. Biacchi, Joshua S. Walker, William D. Rice, Thomas Searles, Valerie A. Kuehl
Over the past decade, substantial progress has been made in the chemical processing (chiral enrichment, length sorting, handedness selectivity, and filling substance) of single- wall carbon nanotubes (SWCNTs). Recently, it was shown that large

Structural Insights into DNA-Stabilized Silver Clusters

May 10, 2019
Author(s)
Danielle Schultz, Robert G. Brinson, Fahriye N. Sari, Jeffrey Fagan, Christina Bergonzo, Nancy Lin, Joy Dunkers
The structure and dynamics of Ag complexes derived from single stranded DNA (ssDNA) is less understood than their double stranded (dsDNA) counterparts despite their great promise as fluorescent biological probes and sensors. In this work, we seek new

Metrological Assessment of Single-Walled Carbon Nanotube Materials by Optical Methods

March 1, 2019
Author(s)
Jeffrey A. Fagan, Angela R. Hight Walker, Ming Zheng, Lefebvre Jacques, Paul Finnie
This chapter discusses the metrology – i.e. the science of measurement – of single-wall carbon nanotubes (SWCNTs) with optical methods. Professor Mildred (“Millie”) Dresselhaus was a strong advocate for nanotube metrology and a pioneer in carbon nanotube

Defect Evolution of Ion-Exposed Single-Wall Carbon Nanotubes

January 3, 2019
Author(s)
Jana Kalbacova, Elias J. Garratt, Raul D. Rodriguez, Angela R. Hight Walker, Kevin A. Twedt, Jeffrey Fagan, Teresa I. Madeira, Jabez J. McClelland, Babak Nikoobakht, Dietrich R. Zahn
A systematic evaluation of defects is essential to understand and engineer device properties and applications. Raman spectroscopy is employed for the characterization of carbon nanomaterials in particular to quantitatively evaluate defects from the