Combustion synthesis of Ga2O3 nanoparticles
Nanophase of Ga 2 O 3 has potentially important applications in photocatalysis. We report the synthesis of nanophase of the metastable γ- and stable β-Ga 2 O 3 and demonstrate that it is possible to prepare a continuously varying mixture starting from the pure metastable γ- to the pure β-phase. This...
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| Veröffentlicht in: | Journal of materials science 2009, Vol.44 (2), p.671-675 |
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| container_title | Journal of materials science |
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| creator | Srihari, V. Sridharan, V. Sahu, H. K. Raghavan, G. Sastry, V. S. Sundar, C. S. |
| description | Nanophase of Ga
2
O
3
has potentially important applications in photocatalysis. We report the synthesis of nanophase of the metastable γ- and stable β-Ga
2
O
3
and demonstrate that it is possible to prepare a continuously varying mixture starting from the pure metastable γ- to the pure β-phase. This is achieved by employing a facile and reliable combustion route, using urea as a fuel. Typical grain sizes, as estimated from XRD studies, are about 3 nm. Given the importance of surface chemistry for potential applications, thermogravimetric coupled with mass spectrometry is used in conjunction with FTIR to elucidate the chemistry of the adsorbed surface layer. Studies on the γ-Ga
2
O
3
phase indicate the occurrence of weight loss of 8.1% in multiple steps. Evolved gas analysis and FTIR studies show presence of physisorbed H
2
O molecules and chemisorbed –(OH) ions bonded to active surface states and accounts predominantly for the observed weight loss. |
| doi_str_mv | 10.1007/s10853-008-3013-3 |
| format | Article |
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2
O
3
has potentially important applications in photocatalysis. We report the synthesis of nanophase of the metastable γ- and stable β-Ga
2
O
3
and demonstrate that it is possible to prepare a continuously varying mixture starting from the pure metastable γ- to the pure β-phase. This is achieved by employing a facile and reliable combustion route, using urea as a fuel. Typical grain sizes, as estimated from XRD studies, are about 3 nm. Given the importance of surface chemistry for potential applications, thermogravimetric coupled with mass spectrometry is used in conjunction with FTIR to elucidate the chemistry of the adsorbed surface layer. Studies on the γ-Ga
2
O
3
phase indicate the occurrence of weight loss of 8.1% in multiple steps. Evolved gas analysis and FTIR studies show presence of physisorbed H
2
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2
O
3
has potentially important applications in photocatalysis. We report the synthesis of nanophase of the metastable γ- and stable β-Ga
2
O
3
and demonstrate that it is possible to prepare a continuously varying mixture starting from the pure metastable γ- to the pure β-phase. This is achieved by employing a facile and reliable combustion route, using urea as a fuel. Typical grain sizes, as estimated from XRD studies, are about 3 nm. Given the importance of surface chemistry for potential applications, thermogravimetric coupled with mass spectrometry is used in conjunction with FTIR to elucidate the chemistry of the adsorbed surface layer. Studies on the γ-Ga
2
O
3
phase indicate the occurrence of weight loss of 8.1% in multiple steps. Evolved gas analysis and FTIR studies show presence of physisorbed H
2
O molecules and chemisorbed –(OH) ions bonded to active surface states and accounts predominantly for the observed weight loss.</description><subject>Beta phase</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemical bonds</subject><subject>Classical Mechanics</subject><subject>Combustion synthesis</subject><subject>Crystallography and Scattering Methods</subject><subject>Gallium oxides</subject><subject>Gas analysis</subject><subject>Grain size</subject><subject>Mass spectrometry</subject><subject>Materials Science</subject><subject>Nanoparticles</subject><subject>Polymer Sciences</subject><subject>Solid Mechanics</subject><subject>Surface layers</subject><subject>Water chemistry</subject><subject>Weight loss</subject><issn>0022-2461</issn><issn>1573-4803</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kE1Lw0AURQdRsFZ_gLuA4EZG33wnSylahUI3uh4m6YympJk6L1n03zslgiC4eptzL_cdQq4Z3DMA84AMSiUoQEkFMEHFCZkxZQSVJYhTMgPgnHKp2Tm5QNwCgDKczcjdIu7qEYc29gUe-uHTY4tFDMXS8bUoetfHvUtD23QeL8lZcB36q587J-_PT2-LF7paL18XjyvaCGkGWjcBAmOu0psGdCXVRuSJjlW6Dr6WTjaCg2F5sIaqro2ujAogjQAPGVZiTm6n3n2KX6PHwe5abHzXud7HEa1QxoDUOoM3f8BtHFOft1kueclNpfP3c8ImqkkRMflg96nduXSwDOxRnp3k2SzPHuVZkTN8ymBm-w-ffpv_D30DCNduuw</recordid><startdate>2009</startdate><enddate>2009</enddate><creator>Srihari, V.</creator><creator>Sridharan, V.</creator><creator>Sahu, H. 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K.</au><au>Raghavan, G.</au><au>Sastry, V. S.</au><au>Sundar, C. S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Combustion synthesis of Ga2O3 nanoparticles</atitle><jtitle>Journal of materials science</jtitle><stitle>J Mater Sci</stitle><date>2009</date><risdate>2009</risdate><volume>44</volume><issue>2</issue><spage>671</spage><epage>675</epage><pages>671-675</pages><issn>0022-2461</issn><eissn>1573-4803</eissn><abstract>Nanophase of Ga
2
O
3
has potentially important applications in photocatalysis. We report the synthesis of nanophase of the metastable γ- and stable β-Ga
2
O
3
and demonstrate that it is possible to prepare a continuously varying mixture starting from the pure metastable γ- to the pure β-phase. This is achieved by employing a facile and reliable combustion route, using urea as a fuel. Typical grain sizes, as estimated from XRD studies, are about 3 nm. Given the importance of surface chemistry for potential applications, thermogravimetric coupled with mass spectrometry is used in conjunction with FTIR to elucidate the chemistry of the adsorbed surface layer. Studies on the γ-Ga
2
O
3
phase indicate the occurrence of weight loss of 8.1% in multiple steps. Evolved gas analysis and FTIR studies show presence of physisorbed H
2
O molecules and chemisorbed –(OH) ions bonded to active surface states and accounts predominantly for the observed weight loss.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s10853-008-3013-3</doi><tpages>5</tpages></addata></record> |
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| issn | 0022-2461 1573-4803 |
| language | eng |
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| source | SpringerNature Journals |
| subjects | Beta phase Characterization and Evaluation of Materials Chemical bonds Classical Mechanics Combustion synthesis Crystallography and Scattering Methods Gallium oxides Gas analysis Grain size Mass spectrometry Materials Science Nanoparticles Polymer Sciences Solid Mechanics Surface layers Water chemistry Weight loss |
| title | Combustion synthesis of Ga2O3 nanoparticles |
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