|
1
|
Liu H, Lee CJJ, Guo S, Chi D. New Insights into Planar Defects in Layered α-MoO 3 Crystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:14003-14011. [PMID: 30365315 DOI: 10.1021/acs.langmuir.8b03102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The observation of regular ( h0 l) planar defects in α-MoO3 crystals can be traced back to over 60 years ago. Two mechanisms have been proposed to interpret the formation of the planar defects. One is related to the diffusion of oxygen vacancies because of thermal-driven release of oxygen atoms in vacuum and the consequent crystallographic shear of α-MoO3. The other is associated with redox reactions of moisture and/or hydrocarbons that give rise to H xMoO3 precipitates. Here, we report that regularly spaced (302) planar defects can be introduced into α-MoO3 belt crystals by heating in liquid sulfur at 300 °C. These defects are undetectable by both atomic force microscopy and scanning electron microscopy at the crystal surface. Raman scattering enhancement and weakening have been observed for different phonon modes of α-MoO3 at the (302) planar defects as probed from the (010) surface. Their comparisons with the Raman scattering enhancements at the edges and the argon-plasma-induced Raman spectral evolutions of the as-grown α-MoO3 belt crystals provide new insights into the planar defects with regard to their formation and characteristics.
Collapse
Affiliation(s)
- Hongfei Liu
- Institute of Materials Research and Engineering (IMRE) , A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Singapore 138634 , Singapore
| | - Coryl J J Lee
- Institute of Materials Research and Engineering (IMRE) , A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Singapore 138634 , Singapore
| | - Shifeng Guo
- Institute of Materials Research and Engineering (IMRE) , A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Singapore 138634 , Singapore
| | - Dongzhi Chi
- Institute of Materials Research and Engineering (IMRE) , A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way , Singapore 138634 , Singapore
| |
Collapse
|
|
2
|
|
|
3
|
|
|
4
|
Lalik E, David WIF, Barnes P, Turner JFC. Mechanisms of Reduction of MoO3 to MoO2 Reconciled? J Phys Chem B 2001. [DOI: 10.1021/jp011622p] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erwin Lalik
- Industrial Materials Group, Department of Crystallography, Birkbeck College, Malet St., London WC1E 7HX, The ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, and The Royal Institution of Great Britain, 21 Albermarle St., London W1X 4BS
| | - William I. F. David
- Industrial Materials Group, Department of Crystallography, Birkbeck College, Malet St., London WC1E 7HX, The ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, and The Royal Institution of Great Britain, 21 Albermarle St., London W1X 4BS
| | - Paul Barnes
- Industrial Materials Group, Department of Crystallography, Birkbeck College, Malet St., London WC1E 7HX, The ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, and The Royal Institution of Great Britain, 21 Albermarle St., London W1X 4BS
| | - John F. C. Turner
- Industrial Materials Group, Department of Crystallography, Birkbeck College, Malet St., London WC1E 7HX, The ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, and The Royal Institution of Great Britain, 21 Albermarle St., London W1X 4BS
| |
Collapse
|
|
5
|
Hsu ZY, Zeng HC. Generation of Double-Layer Steps on (010) Surface of Orthorhombic MoO3 via Chemical Etching at Room Temperature. J Phys Chem B 2000. [DOI: 10.1021/jp001521b] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Z. Y. Hsu
- Department of Chemical and Environmental Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
| | - H. C. Zeng
- Department of Chemical and Environmental Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
| |
Collapse
|
|
6
|
|
|
7
|
Seliger J, Žagar V, Blinc R. 1H-17O nuclear quadrupole double resonance study of hydrogen bonds in (CH3COO)2KH and (CH3COO)2NaH. Chem Phys Lett 1989. [DOI: 10.1016/0009-2614(89)85228-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
|
8
|
Hansen S, Andersson A. Electron microscopy of some molybdenum oxide phases after use as catalysts in oxidative ammonolysis and ammoxidation of toluene. J SOLID STATE CHEM 1988. [DOI: 10.1016/0022-4596(88)90162-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
|
9
|
|
|
10
|
|
|
11
|
Bertrand O, Dufour LC. X-ray and electron microscopy investigation of the topotactic transformation of MoO3 into MoO2. ACTA ACUST UNITED AC 1980. [DOI: 10.1002/pssa.2210600222] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
|
12
|
|