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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.01726 |
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| _version_ | 1866917116393816064 |
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| author | Xia, Zehui Bhatia, Pia Morral, Celia DiPaolo, Brian Golovina, Iryna Buvač-Drndić, Adriana Lin, Chih-Yuan Niedzwiecki, David Drndić, Marija |
| author_facet | Xia, Zehui Bhatia, Pia Morral, Celia DiPaolo, Brian Golovina, Iryna Buvač-Drndić, Adriana Lin, Chih-Yuan Niedzwiecki, David Drndić, Marija |
| contents | We report in-situ synthesis of iron oxide particles inside silicon nitride nanopores via a chemical reaction, monitored by current readout. Nanopores were formed by electroporation on glass chips (diameters from 1.7 to 11.3 nm), transmission electron microscopy (TEM) drilling (diameters from 6.5 to 64.6 nm), or hydrofluoric acid (HF) etching (diameters from 12.6 to 36.2 nm) in 5 to 20 nm thick membranes. Nanopores seal on timescales from ~1 ms to ~3.6 s, across a range of sizes and concentrations. We show single and ~5-pore arrays, as fabricated, after sealing, and after cleaning and pore recovery. These results are independent of fabrication method. Energy dispersive X-ray spectroscopy (EDS), aberration-corrected scanning TEM (AC-STEM), and powder X-ray diffraction (XRD) verify the synthesis of mixed magnetite and maghemite iron oxide. This work advances nanoparticle-nanopore chips for applications in biosensing, plasmonics and photonics when position and size control is required. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_01726 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reversible nanopore sealing and in situ iron oxide nanoparticle synthesis on thin silicon nitride membranes Xia, Zehui Bhatia, Pia Morral, Celia DiPaolo, Brian Golovina, Iryna Buvač-Drndić, Adriana Lin, Chih-Yuan Niedzwiecki, David Drndić, Marija Materials Science We report in-situ synthesis of iron oxide particles inside silicon nitride nanopores via a chemical reaction, monitored by current readout. Nanopores were formed by electroporation on glass chips (diameters from 1.7 to 11.3 nm), transmission electron microscopy (TEM) drilling (diameters from 6.5 to 64.6 nm), or hydrofluoric acid (HF) etching (diameters from 12.6 to 36.2 nm) in 5 to 20 nm thick membranes. Nanopores seal on timescales from ~1 ms to ~3.6 s, across a range of sizes and concentrations. We show single and ~5-pore arrays, as fabricated, after sealing, and after cleaning and pore recovery. These results are independent of fabrication method. Energy dispersive X-ray spectroscopy (EDS), aberration-corrected scanning TEM (AC-STEM), and powder X-ray diffraction (XRD) verify the synthesis of mixed magnetite and maghemite iron oxide. This work advances nanoparticle-nanopore chips for applications in biosensing, plasmonics and photonics when position and size control is required. |
| title | Reversible nanopore sealing and in situ iron oxide nanoparticle synthesis on thin silicon nitride membranes |
| topic | Materials Science |
| url | https://arxiv.org/abs/2512.01726 |