Search

Your search keyword '"Fairbrother D"' showing total 556 results
Start Over Author "Fairbrother D"
556 results on '"Fairbrother D"'

11. Stability of Ti3C2Tx MXenes in engineered environments

Author

Ganji, Nasim, primary, Reardon-Lochbaum, Christian A., additional, Ambade, Swapnil B., additional, Anastasia, Caroline M., additional, Eckhert, Patrick M., additional, Rosenzweig, Zeev, additional, Pedersen, Joel A., additional, and Fairbrother, D. Howard, additional

Published
2024
Full Text
View/download PDF

12. Zinc‐Imidazolate Films as an All‐Dry Resist Technology

Author

Corkery, Peter, primary, Waltz, Kayley E., additional, Eckhert, Patrick M., additional, Ahmad, Mueed, additional, Kraetz, Andrea, additional, Miao, Yurun, additional, Lee, Dennis T., additional, Abdel‐Rahman, Mohammed K., additional, Lan, Yucheng, additional, Haghi‐Ashtiani, Paul, additional, Stein, Aaron, additional, Boscoboinik, J. Anibal, additional, Tsapatsis, Michael, additional, and Fairbrother, D. Howard, additional

Published
2023
Full Text
View/download PDF

15. Reactions of Ions with Adsorbed Me3PtCpMe: The Role of Ion Identity

Author

Abdel-Rahman, Mohammed K., Eckhert, Patrick M., McElwee-White, Lisa, and Fairbrother, D. Howard

Abstract

In focused ion-beam-induced deposition (FIBID) processes, the deposition rate and deposit composition are determined by the interplay between ion-induced deposition and sputtering of the deposited atoms. To provide independent insights into these two facets of FIBID, an ultrahigh vacuum (UHV) surface science approach employing in situ X-ray photoelectron spectroscopy (XPS) and mass spectrometry (MS) has been used to study how the identity of incident ions (Z = He, Ne, Ar, H2or D2) influences ion-induced (i) deposition from adsorbed Me3PtCpMe and (ii) sputtering of the PtCxfilms created from Me3PtCpMe. For each of the ions studied, the initial decomposition/deposition step could be described as Me3PtCpMe(ads)+ Z(g)+? PtC9–x(ads)+ xCH4(g)+ H2(g)although the rate and extent of carbon loss from the Me3PtCpMe precursor depended on the ion identity, with heavier ions (Ar+, Ne+) leading to faster and more extensive fragmentation. For the heavier ions, these findings were ascribed to direct momentum/energy transfer between incident ions and adsorbed precursor molecules, while for the lighter ions, there is an increasing contribution from secondary electrons generated by ion–substrate interactions. While the Pt atom purity associated with ion-induced precursor decomposition was lower for the lighter ions, ion-induced sputtering of PtCxfilms by lighter ions produced the greatest increase in metal content (i.e., purity), due to the extremely poor mass match with Pt. Indeed, sputtering of nanometer-thick PtCxfilms by H2+/D2+produced essentially pure Pt films, as measured by XPS. Increasing the substrate temperature during sputtering, however, inhibited the purification process. The results of these findings in the context of FIBID, conducted in the presence of a constant partial pressure of precursor molecules, are also discussed.

Published
2024
Full Text
View/download PDF

16. Zinc‐Imidazolate Films as an All‐Dry Resist Technology.

Author

Corkery, Peter, Waltz, Kayley E., Eckhert, Patrick M., Ahmad, Mueed, Kraetz, Andrea, Miao, Yurun, Lee, Dennis T., Abdel‐Rahman, Mohammed K., Lan, Yucheng, Haghi‐Ashtiani, Paul, Stein, Aaron, Boscoboinik, J. Anibal, Tsapatsis, Michael, and Fairbrother, D. Howard

Subjects
ELECTRON beam lithography, ELECTRON beams, SEMICONDUCTOR manufacturing, CHEMICAL structure, PLASMA etching, LOW temperatures
Abstract

Motivated by the drawbacks of solution phase processing, an all‐dry resist formation process is presented that utilizes amorphous zinc‐imidazolate (aZnMIm) films deposited by atomic/molecular layer deposition (ALD/MLD), patterned with electron beam lithography (EBL), and developed by novel low temperature (120 °C) gas phase etching using 1,1,1,5,5,5‐hexafluoroacetylacetone (hfacH) to achieve well‐resolved 22 nm lines with a pitch of 30 nm. The effects of electron beam irradiation on the chemical structure and hfacH etch resistance of aZnMIm films are investigated, and it is found that electron irradiation degrades the 2‐methylimidazolate ligands and transforms aZnMIm into a more dense material that is resistant to etching by hfacH and has a C:N:Zn ratio effectively identical to that of unmodified aZnMIm. These findings showcase the potential for aZnMIm films to function in a dry resist technology. Sensitivity, contrast, and critical dimensions of the patterns are determined to be 37 mC cm−2, 0.87, and 29 nm, respectively, for aZnMIm deposited on silicon substrates and patterned at 30 keV. This work introduces a new direction for solvent‐free resist processing, offering the prospect of scalable, high‐resolution patterning techniques for advanced semiconductor fabrication processes. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

22. Amorphous zinc-imidazolate all-dry resists

Author

Guerrero, Douglas, Amblard, Gilles R., Waltz, Kayley E., Eckhert, Patrick M., Corkery, Peter, Ahmad, Mueed, Kraetz, Andrea, Miao, Yurun, Lee, Dennis T., Abdel-Rahman, Mohammed K., Lan, Yucheng, Haghi-Ashtiani, Paul, Stein, Aaron, Boscoboinik, J. Anibal, Tsapatsis, Michael, and Fairbrother, D. Howard

Published
2024
Full Text
View/download PDF

28. Stability of Ti3C2TxMXenes in engineered environmentsElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3en00438d

Author

Ganji, Nasim, Reardon-Lochbaum, Christian A., Ambade, Swapnil B., Anastasia, Caroline M., Eckhert, Patrick M., Rosenzweig, Zeev, Pedersen, Joel A., and Fairbrother, D. Howard

Abstract

MXenes are a newer class of 2D materials with desirable properties, making them attractive for various environmental applications, including remediation and as membranes for water treatment. Until recently, the practical implementation of MXenes was hindered by their instability in water, although improved synthesis procedures have addressed this issue. Consequently, it is now important to assess the stability of MXenes in engineered environments relevant to drinking water and membrane operation (e.g.backwashing). In this study, Ti3C2TxMXenes were found to remain stable upon exposure to an aqueous environment saturated with oxygen and to UVC and UVA light at circumneutral pH, but were transformed upon exposure to excess free chlorine and to Fe(iii) chloride at a concentration equal to 5 mg L−1free chlorine. The chlorination reaction kinetics are 1st order with respect to Ti3C2Txand free chlorine concentration from 20 to 200 mg L−1. The rate constant increased at pH ≤7.5, implicating HOCl as the reactive species. We propose that MXene reactions with HOCl occur by an electrophilic attack of Cl+, forming TiO2and degrading the MXene. AFM data show that transformations are initiated at the edges of the MXene sheets and localized areas on the MXene, suggesting that the initial sites for Cl+attack are defect sites and/or uncoordinated Ti atoms. This contrasts with the inertness of nanoscale TiC, highlighting the need to devise surface modification processes that will allow MXenes to resist the oxidative conditions associated with membrane regeneration/backwashing.

Published
2024
Full Text
View/download PDF

37. Interactions of Ti3C2 MXene with Aqueous Zwitterionic Biological Buffers: Implications for Applications in Biological Systems.

Author

Ambade, Swapnil B., Kesner, Laura A., Abdel-Rahman, Mohammed K., Fairbrother, D. Howard, and Rosenzweig, Zeev

Abstract

MXenes, a family of ultrathin layered two-dimensional (2D) transition-metal carbides, nitrides, and carbonitrides, are steadily advancing as novel inorganic nanosystems for a broad range of applications. While high conductivity, solution processability, hydrophilic nature, and the presence of various surface functional groups enable the use of 2D MXenes in aqueous systems, applications that involve the use of MXenes in aqueous systems and biological solutions, including but not limited to water treatment, water desalination, and biological assays, are only beginning to emerge. For the successful application of MXene in aqueous systems, their interactions with common aqueous solution constituents must be better understood. This paper describes the structural and functional properties of Ti3C2Tx (Tx = O−, OH−, F−) MXenes in N-substituted commonly used biological buffers like N-(2-hydroxyethyl)-piperazine-N′-ethanesulfonic acid (HEPES) and 3-(N-morpholino)-propane sulfonic acid (MOPS) and with a series of piperazine-based molecules dissolved in phosphate buffer solutions. Dissolving MXenes in these buffers significantly impacts their optical, structural, and electrical properties. The interactions of Ti3C2Tx MXenes with N-substituted zwitterionic buffer molecules are structure-dependent and mostly but not fully reversible. X-ray photoelectron spectroscopy measurements reveal small but measurable surface oxidation through the formation of Ti–O bonds. Our results suggest a complex interaction pattern where some interactions are driven by hydrogen bonding and electrostatic forces, while others involve chemisorption, which results in a permanent impact on the MXene nanosheets. This study is an important step toward understanding the stability of MXenes in complex aqueous media and the impact of interactions of MXenes with nitrogen-containing molecules on MXene properties, which are especially important in applications of MXenes in biological systems. The nature of interactions between MXenes and biological buffer molecules, revealed in our study, suggests that surface chemistry modifications of MXenes are required to preserve their chemical stability and enable their applications in complex biological solutions. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

46. Biodegradation of Functionalized Nanocellulose

Author

Frank, Benjamin P., primary, Smith, Casey, additional, Caudill, Emily R., additional, Lankone, Ronald S., additional, Carlin, Katrina, additional, Benware, Sarah, additional, Pedersen, Joel A., additional, and Fairbrother, D. Howard, additional

Published
2021
Full Text
View/download PDF

50. TandEM: Titan and Enceladus mission

Author

Coustenis, A., Atreya, S. K., Balint, T., Brown, R. H., Dougherty, M. K., Ferri, F., Fulchignoni, M., Gautier, D., Gowen, R. A., Griffith, C. A., Gurvits, L. I., Jaumann, R., Langevin, Y., Leese, M. R., Lunine, J. I., McKay, C. P., Moussas, X., Müller-Wodarg, I., Neubauer, F., Owen, T. C., Raulin, F., Sittler, E. C., Sohl, F., Sotin, C., Tobie, G., Tokano, T., Turtle, E. P., Wahlund, J.-E., Waite, J. H., Baines, K. H., Blamont, J., Coates, A. J., Dandouras, I., Krimigis, T., Lellouch, E., Lorenz, R. D., Morse, A., Porco, C. C., Hirtzig, M., Saur, J., Spilker, T., Zarnecki, J. C., Choi, E., Achilleos, N., Amils, R., Annan, P., Atkinson, D. H., Bénilan, Y., Bertucci, C., Bézard, B., Bjoraker, G. L., Blanc, M., Boireau, L., Bouman, J., Cabane, M., Capria, M. T., Chassefière, E., Coll, P., Combes, M., Cooper, J. F., Coradini, A., Crary, F., Cravens, T., Daglis, I. A., de Angelis, E., de Bergh, C., de Pater, I., Dunford, C., Durry, G., Dutuit, O., Fairbrother, D., Flasar, F. M., Fortes, A. D., Frampton, R., Fujimoto, M., Galand, M., Grasset, O., Grott, M., Haltigin, T., Herique, A., Hersant, F., Hussmann, H., Ip, W., Johnson, R., Kallio, E., Kempf, S., Knapmeyer, M., Kofman, W., Koop, R., Kostiuk, T., Krupp, N., Küppers, M., Lammer, H., Lara, L.-M., Lavvas, P., Le Mouélic, S., Lebonnois, S., Ledvina, S., Li, J., Livengood, T. A., Lopes, R. M., Lopez-Moreno, J.-J., Luz, D., Mahaffy, P. R., Mall, U., Martinez-Frias, J., Marty, B., McCord, T., Menor Salvan, C., Milillo, A., Mitchell, D. G., Modolo, R., Mousis, O., Nakamura, M., Neish, C. D., Nixon, C. A., Nna Mvondo, D., Orton, G., Paetzold, M., Pitman, J., Pogrebenko, S., Pollard, W., Prieto-Ballesteros, O., Rannou, P., Reh, K., Richter, L., Robb, F. T., Rodrigo, R., Rodriguez, S., Romani, P., Ruiz Bermejo, M., Sarris, E. T., Schenk, P., Schmitt, B., Schmitz, N., Schulze-Makuch, D., Schwingenschuh, K., Selig, A., Sicardy, B., Soderblom, L., Spilker, L. J., Stam, D., Steele, A., Stephan, K., Strobel, D. F., Szego, K., Szopa, C., Thissen, R., Tomasko, M. G., Toublanc, D., Vali, H., Vardavas, I., Vuitton, V., West, R. A., Yelle, R., and Young, E. F.

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results