Sonofragmentation of Ultrathin 1D Nanomaterials
A top-down method of NP synthesis that results in high-monodispersity NPs was studied. We first dispersed ultrathin Ge nanowires in dimethylformamide (DMF), and ultrasonicated the suspension with a bench-top ultrasonicator. To track fragmentation of the nanowires, we imaged the ultrasonicated sample...
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| Format: | Article |
| Language: | English |
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Wiley
2021
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| Online Access: | https://hdl.handle.net/1721.1/135699 |
| _version_ | 1826191650178727936 |
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| author | Gao, Ruixuan Gupta, Ishan Boyden, Edward S |
| author2 | Massachusetts Institute of Technology. Media Laboratory |
| author_facet | Massachusetts Institute of Technology. Media Laboratory Gao, Ruixuan Gupta, Ishan Boyden, Edward S |
| author_sort | Gao, Ruixuan |
| collection | MIT |
| description | A top-down method of NP synthesis that results in high-monodispersity NPs was studied. We first dispersed ultrathin Ge nanowires in dimethylformamide (DMF), and ultrasonicated the suspension with a bench-top ultrasonicator. To track fragmentation of the nanowires, we imaged the ultrasonicated sample at different time points using scanning electron microscopy (SEM) We found that the nanowires readily fragmented into <30 nm particles within 30 minutes of ultrasonication. The particle size further decreased with increasing ultrasonication time. For instance, the majority of the NPs had diameters of <10 nm with 18 h ultrasonication. As comparison, we carried out the same ultrasonication using a non-1D Ge substrate. In contrast to the nanowires, the nanopowder did not show a clear change in particle size with increasing ultrasonication time. For instance, after 18 h of ultrasonication, we observed mostly =100-300 nm particles, comparable to the size distribution of the starting material. We analyzed Ge NPs produced after 18 h of nanowire ultrasonication using transmission electron microscopy (TEM). NPs were resuspended in ethanol, filtered through a 0.2 μm filter to remove large debris and aggregates, and drop-casted and dried on a copper/carbon grid. Analysis of bright-field TEM images shows the NPs had an average size of 3.58 nm and a standard deviation of 0.74 nm, confirming generation of ultrasmall Ge NPs. Furthermore, high-resolution TEM (HRTEM) imaging of a typical Ge NP showed clear lattice fringes, indicating minimal amorphization effect during the long-term ultrasonication. |
| first_indexed | 2024-09-23T08:59:14Z |
| format | Article |
| id | mit-1721.1/135699 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:59:14Z |
| publishDate | 2021 |
| publisher | Wiley |
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| spelling | mit-1721.1/1356992023-02-16T19:51:18Z Sonofragmentation of Ultrathin 1D Nanomaterials Gao, Ruixuan Gupta, Ishan Boyden, Edward S Massachusetts Institute of Technology. Media Laboratory Massachusetts Institute of Technology. Department of Biological Engineering McGovern Institute for Brain Research at MIT A top-down method of NP synthesis that results in high-monodispersity NPs was studied. We first dispersed ultrathin Ge nanowires in dimethylformamide (DMF), and ultrasonicated the suspension with a bench-top ultrasonicator. To track fragmentation of the nanowires, we imaged the ultrasonicated sample at different time points using scanning electron microscopy (SEM) We found that the nanowires readily fragmented into <30 nm particles within 30 minutes of ultrasonication. The particle size further decreased with increasing ultrasonication time. For instance, the majority of the NPs had diameters of <10 nm with 18 h ultrasonication. As comparison, we carried out the same ultrasonication using a non-1D Ge substrate. In contrast to the nanowires, the nanopowder did not show a clear change in particle size with increasing ultrasonication time. For instance, after 18 h of ultrasonication, we observed mostly =100-300 nm particles, comparable to the size distribution of the starting material. We analyzed Ge NPs produced after 18 h of nanowire ultrasonication using transmission electron microscopy (TEM). NPs were resuspended in ethanol, filtered through a 0.2 μm filter to remove large debris and aggregates, and drop-casted and dried on a copper/carbon grid. Analysis of bright-field TEM images shows the NPs had an average size of 3.58 nm and a standard deviation of 0.74 nm, confirming generation of ultrasmall Ge NPs. Furthermore, high-resolution TEM (HRTEM) imaging of a typical Ge NP showed clear lattice fringes, indicating minimal amorphization effect during the long-term ultrasonication. 2021-10-27T20:28:52Z 2021-10-27T20:28:52Z 2017 2019-07-19T12:13:47Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135699 Gao, Ruixuan, Ishan Gupta, and Edward S. Boyden. "Sonofragmentation of Ultrathin 1d Nanomaterials." Particle & Particle Systems Characterization 34 1 (2017). en 10.1002/PPSC.201600339 Particle and Particle Systems Characterization Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Wiley PMC |
| spellingShingle | Gao, Ruixuan Gupta, Ishan Boyden, Edward S Sonofragmentation of Ultrathin 1D Nanomaterials |
| title | Sonofragmentation of Ultrathin 1D Nanomaterials |
| title_full | Sonofragmentation of Ultrathin 1D Nanomaterials |
| title_fullStr | Sonofragmentation of Ultrathin 1D Nanomaterials |
| title_full_unstemmed | Sonofragmentation of Ultrathin 1D Nanomaterials |
| title_short | Sonofragmentation of Ultrathin 1D Nanomaterials |
| title_sort | sonofragmentation of ultrathin 1d nanomaterials |
| url | https://hdl.handle.net/1721.1/135699 |
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