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4. Precise Fabrication of Uniform Molecular Gaps for Active Nanoscale Devices

Author

Niroui, Farnaz, Saravanapavanantham, Mayuran, Han, Jinchi, Patil, Jatin J., Swager, Timothy M., Lang, Jeffrey H., and Bulović, Vladimir

Subjects
Physics - Applied Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Molecules with versatile functionalities and well-defined structures, can serve as building blocks for extreme nanoscale devices. This requires their precise integration into functional heterojunctions, most commonly in the form of metal-molecule-metal architectures. Structural damage and nonuniformities caused by current fabrication techniques, however, limit their effective incorporation. Here, we present a hybrid fabrication approach enabling uniform molecular gaps. Template-stripped lithographically-patterned gold electrodes with sub-nanometer roughness are used as the bottom contacts upon which the molecular layer is formed through self-assembly. The top contacts are assembled using dielectrophoretic trapping of colloidal gold nanorods, resulting in uniform sub-5 nm junctions. In these electrically-active designs, we further explore the possibility of mechanical tunability. The presence of molecules may help control sub-nanometer mechanical modulation which is conventionally difficult to achieve due to instabilities caused by surface adhesive forces. Our approach is versatile, providing a platform to develop and study active molecular gaps towards functional nanodevices.

Published
2020

19. Resistivity detection of perfluoroalkyl substances with fluorous polyaniline in an electrical lateral flow sensor.

Author

Sohyun Park, Gordon, Collette T., and Swager, Timothy M.

Subjects
FLUOROALKYL compounds, FLOW sensors, PERFLUOROOCTANOIC acid, POLYANILINES, ENVIRONMENTAL health
Abstract

Perfluoroalkyl substances (PFAS), known as "forever chemicals," are a growing concern in the sphere of human and environmental health. In response, rapid, reproducible, and inexpensive methods for PFAS detection in the environment and home water supplies are needed. We have developed a simple and inexpensive perfluoroalkyl acid detection method based on an electrically read lateral flow assay (e-LFA). Our method employs a fluorous surfactant formulation with undoped polyaniline (F-PANI) fabricated to create test lines for the lateral flow assay. In perfluoroalkyl acid sensing studies, an increase in conductivity of the F-PANI film is caused by acidification and doping of PANI. A conductivity enhancement by 104-fold can be produced by this method, and we demonstrate a limit of detection for perfluorooctanoic acid (PFOA) of 400 ppt and perfluorobutanoic acid of 200 ppt. This method for PFOA detection can be expanded for wide-scale environmental and at-home water testing. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Leveraging a smartphone to perform time-gated luminescence measurements

Author

Fratto, Brian E., primary, Culver, Emma L., additional, Davis, Gabriel, additional, Deans, Robert, additional, Goods, John B., additional, Hwang, Sean, additional, Keller, Nicole K., additional, Lawrence, John A., additional, Petty, Alexander R., additional, Swager, Timothy M., additional, Walish, Joseph J., additional, Zhu, Zhengguo, additional, and Cox, Jason R., additional

Published
2023
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47. Antiaromaticity in Nonbenzenoid Oligoarenes and Ladder Polymers

Author

Parkhurst, Rebecca R., Swager, Timothy M., Bayley, Hagan, Series editor, Houk, Kendall N., Series editor, Hughes, Greg, Series editor, Hunter, Christopher A., Series editor, Ishihara, Kazuaki, Series editor, Krische, Michael J, Series editor, Lehn, Jean-Marie, Series editor, Luque, Rafael, Series editor, Olivucci, Massimo, Series editor, Siegel, Jay S., Series editor, Thiem, Joachim, Series editor, Venturi, Margherita, Series editor, Wong, Chi-Huey, Series editor, Wong, Henry N.C., Series editor, and Wu, Yao-Ting, editor

Published
2014
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