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DC Field | Value | Language |
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dc.citation.endPage | 175 | - |
dc.citation.number | 7132 | - |
dc.citation.startPage | 172 | - |
dc.citation.title | NATURE | - |
dc.citation.volume | 446 | - |
dc.contributor.author | Bao, Zhihao | - |
dc.contributor.author | Weatherspoon, Michael R. | - |
dc.contributor.author | Shian, Samuel | - |
dc.contributor.author | Cai, Ye | - |
dc.contributor.author | Graham, Phillip D. | - |
dc.contributor.author | Allan, Shawn M. | - |
dc.contributor.author | Ahmad, Gul | - |
dc.contributor.author | Dickerson, Matthew B. | - |
dc.contributor.author | Church, Benjamin C. | - |
dc.contributor.author | Kang, Zhitao | - |
dc.contributor.author | Abernathy, Harry W., III | - |
dc.contributor.author | Summers, Christopher J. | - |
dc.contributor.author | Liu, Meilin | - |
dc.contributor.author | Sandhage, Kenneth H. | - |
dc.date.accessioned | 2023-12-22T09:36:37Z | - |
dc.date.available | 2023-12-22T09:36:37Z | - |
dc.date.created | 2014-08-28 | - |
dc.date.issued | 2007-03 | - |
dc.description.abstract | The carbothermal reduction of silica into silicon requires the use of temperatures well above the silicon melting point (≥2,000°C). Solid silicon has recently been generated directly from silica at much lower temperatures (≤850°C) via electrochemical reduction in molten salts. However, the silicon products of such electrochemical reduction did not retain the microscale morphology of the starting silica reactants. Here we demonstrate a low-temperature (650°C) magnesiothermic reduction process for converting three-dimensional nanostructured silica micro-assemblies into microporous nanocrystalline silicon replicas. The intricate nanostructured silica microshells (frustules) of diatoms (unicellular algae) were converted into co-continuous, nanocrystalline mixtures of silicon and magnesia by reaction with magnesium gas. Selective magnesia dissolution then yielded an interconnected network of silicon nanocrystals that retained the starting three-dimensional frustule morphology. The silicon replicas possessed a high specific surface area (>500 m2 g-1), and contained a significant population of micropores (≤20 A). The silicon replicas were photoluminescent, and exhibited rapid changes in impedance upon exposure to gaseous nitric oxide (suggesting a possible application in microscale gas sensing). This process enables the syntheses of microporous nanocrystalline silicon micro-assemblies with multifarious three-dimensional shapes inherited from biological or synthetic silica templates for sensor, electronic, optical or biomedical applications. | - |
dc.identifier.bibliographicCitation | NATURE, v.446, no.7132, pp.172 - 175 | - |
dc.identifier.doi | 10.1038/nature05570 | - |
dc.identifier.issn | 0028-0836 | - |
dc.identifier.scopusid | 2-s2.0-33947099047 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/5742 | - |
dc.identifier.url | http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=33947099047 | - |
dc.identifier.wosid | 000244718100037 | - |
dc.language | 영어 | - |
dc.publisher | NATURE PUBLISHING GROUP | - |
dc.title | Chemical reduction of three-dimensional silica micro-assemblies into microporous silicon replicas | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | POROUS SILICON | - |
dc.subject.keywordPlus | GAS SENSOR | - |
dc.subject.keywordPlus | VAPOR | - |
dc.subject.keywordPlus | EMISSION | - |
dc.subject.keywordPlus | DIOXIDE | - |
dc.subject.keywordPlus | WATER | - |
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