<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Si nanopowder is fabricated using the simple beads milling method. Fabricated Si nanopowder reacts with water in the neutral pH region between 7 and 9 to generate hydrogen. The hydrogen generation rate greatly increases with pH, while pH does not change after the hydrogen generation reaction. In the case of the reactions of Si nanopowder with strong alkaline solutions (<italic>eg</italic> pH13.9), 1600 mL hydrogen is generated from 1 g Si nanopowder in a short time (<italic>eg</italic> 15 min). When Si nanopowder is etched with HF solutions and immersed in ethanol, green photoluminescence (PL) is observed, and it is attributed to band-to-band transition of Si nanopowder. The Si nanopowder without HF etching in hexane shows blue PL. The PL spectra possess peaked structure, and it is attributed to vibronic bands of 9,10-dimethylantracene (DMA) in hexane solutions. The PL intensity is increased by more than 3,000 times by adsorption of DMA on Si nanopowder.</p></abstract>

Si nanopowder is fabricated using the simple beads milling method. Fabricated Si nanopowder reacts with water in the neutral pH region between 7 and 9 to generate hydrogen. The hydrogen generation rate greatly increases with pH, while pH does not change after the hydrogen generation reaction. In the case of the reactions of Si nanopowder with strong alkaline solutions (eg pH13.9), 1600 mL hydrogen is generated from 1 g Si nanopowder in a short time (eg 15 min). When Si nanopowder is etched with HF solutions and immersed in ethanol, green photoluminescence (PL) is observed, and it is attributed to band-to-band transition of Si nanopowder. The Si nanopowder without HF etching in hexane shows blue PL. The PL spectra possess peaked structure, and it is attributed to vibronic bands of 9,10-dimethylantracene (DMA) in hexane solutions. The PL intensity is increased by more than 3,000 times by adsorption of DMA on Si nanopowder.

Fabrication of Si nanopowder and application to hydrogen generation and photoluminescent material

Institute of Scientific and Industrial Research

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Si nanopowder is fabricated using the simple beads milling method. Fabricated Si nanopowder reacts with water in the neutral pH region between 7 and 9 to...

Fabrication of Si nanopowder and application to hydrogen generation and photoluminescent material

Publié en ligne: 29 déc. 2017

Pages: 17 - 23

Reçu: 23 avr. 2017

DOI: https://doi.org/10.1515/jee-2017-0050

Mots clés
beads milling, hydrogen generation rate, PL enhancement, adsorption

© 2017 Yuki Kobayashi et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Fabrication of Si nanopowder and application to hydrogen generation and photoluminescent material

Publié en ligne: 29 déc. 2017

Pages: 17 - 23

Reçu: 23 avr. 2017

DOI: https://doi.org/10.1515/jee-2017-0050

Mots clésbeads milling, hydrogen generation rate, PL enhancement, adsorption

© 2017 Yuki Kobayashi et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
beads milling, hydrogen generation rate, PL enhancement, adsorption