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Title: Reversible Formation of Silanol Groups in Two-Dimensional Siliceous Nanomaterials under Mild Hydrothermal Conditions

Abstract

Monitoring the effects of mild hydrothermal conditions, in situ, on siliceous materials remains challenging using surface science techniques, which often require electrically conductive substrates. The emergence of two-dimensional (2-D) siliceous nanomaterials deposited on metal single crystals overcomes this limitation. Here, we use infrared reflection absorption spectroscopy (IRRAS) to study the effects of mild hydrothermal conditions, in situ, on 2-D model systems, namely, all-Si MFI nanosheets supported on Au(111) and a polymorphous bilayer silicate supported on Ru(0001). We find that the formation of silanol groups (SiOH) occurs at 473 and 573 K under a H2O pressure of 3 mbar in the MFI nanosheets, but not in the polymorphous bilayer silicate. The effects of mild hydrothermal conditions are reversible in the MFI nanosheets and do not result in framework degradation. Implications shown here provide a fundamental understanding of the impact of mild hydrothermal conditions on the 2-D siliceous nanomaterials and serve as a starting point when considering these effects on three-dimensional (3-D) ones.

Authors:
 [1];  [2];  [3];  [4];  [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Univ. of Minnesota, Minneapolis, MN (United States); Chonnam National Univ., Gwangju (Korea, Republic of)
  3. Catalysis Center for Energy Innovation, University of Delaware, 221 Academy Street, Newark, Delaware 19716 United States
  4. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Univ. of Delaware, Newark, DE (United States); Univ. of Minnesota, Minneapolis, MN (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  7. Univ. of Delaware, Newark, DE (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1670664
Report Number(s):
BNL-219914-2020-JAAM
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
SC0012704; SC0001004
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 124; Journal Issue: 33; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Norton, Angela M., Kim, Donghun, Zheng, Weiqing, Akter, Nusnin, Xu, Yixin, Tenney, Samuel A., Vlachos, Dionisios G., Tsapatsis, Michael, and Boscoboinik, J. Anibal. Reversible Formation of Silanol Groups in Two-Dimensional Siliceous Nanomaterials under Mild Hydrothermal Conditions. United States: N. p., 2020. Web. doi:10.1021/acs.jpcc.0c03875.
Norton, Angela M., Kim, Donghun, Zheng, Weiqing, Akter, Nusnin, Xu, Yixin, Tenney, Samuel A., Vlachos, Dionisios G., Tsapatsis, Michael, & Boscoboinik, J. Anibal. Reversible Formation of Silanol Groups in Two-Dimensional Siliceous Nanomaterials under Mild Hydrothermal Conditions. United States. https://doi.org/10.1021/acs.jpcc.0c03875
Norton, Angela M., Kim, Donghun, Zheng, Weiqing, Akter, Nusnin, Xu, Yixin, Tenney, Samuel A., Vlachos, Dionisios G., Tsapatsis, Michael, and Boscoboinik, J. Anibal. Sun . "Reversible Formation of Silanol Groups in Two-Dimensional Siliceous Nanomaterials under Mild Hydrothermal Conditions". United States. https://doi.org/10.1021/acs.jpcc.0c03875. https://www.osti.gov/servlets/purl/1670664.
@article{osti_1670664,
title = {Reversible Formation of Silanol Groups in Two-Dimensional Siliceous Nanomaterials under Mild Hydrothermal Conditions},
author = {Norton, Angela M. and Kim, Donghun and Zheng, Weiqing and Akter, Nusnin and Xu, Yixin and Tenney, Samuel A. and Vlachos, Dionisios G. and Tsapatsis, Michael and Boscoboinik, J. Anibal},
abstractNote = {Monitoring the effects of mild hydrothermal conditions, in situ, on siliceous materials remains challenging using surface science techniques, which often require electrically conductive substrates. The emergence of two-dimensional (2-D) siliceous nanomaterials deposited on metal single crystals overcomes this limitation. Here, we use infrared reflection absorption spectroscopy (IRRAS) to study the effects of mild hydrothermal conditions, in situ, on 2-D model systems, namely, all-Si MFI nanosheets supported on Au(111) and a polymorphous bilayer silicate supported on Ru(0001). We find that the formation of silanol groups (SiOH) occurs at 473 and 573 K under a H2O pressure of 3 mbar in the MFI nanosheets, but not in the polymorphous bilayer silicate. The effects of mild hydrothermal conditions are reversible in the MFI nanosheets and do not result in framework degradation. Implications shown here provide a fundamental understanding of the impact of mild hydrothermal conditions on the 2-D siliceous nanomaterials and serve as a starting point when considering these effects on three-dimensional (3-D) ones.},
doi = {10.1021/acs.jpcc.0c03875},
journal = {Journal of Physical Chemistry. C},
number = 33,
volume = 124,
place = {United States},
year = {Sun Jul 26 00:00:00 EDT 2020},
month = {Sun Jul 26 00:00:00 EDT 2020}
}

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